CbC/CbC_gcc: gcc/tree-ssa-uninit.c annotate

annotate gcc/tree-ssa-uninit.c @ 158:494b0b89df80 default tip

...

author	Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date	Mon, 25 May 2020 18:13:55 +0900
parents	1830386684a0
children

rev	line source
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1 /* Predicate aware uninitialized variable warning.
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	2 Copyright (C) 2001-2020 Free Software Foundation, Inc.
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	3 Contributed by Xinliang David Li <davidxl@google.com>
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	4
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	5 This file is part of GCC.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	6
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	7 GCC is free software; you can redistribute it and/or modify
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	8 it under the terms of the GNU General Public License as published by
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	9 the Free Software Foundation; either version 3, or (at your option)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	10 any later version.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	11
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	12 GCC is distributed in the hope that it will be useful,
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	13 but WITHOUT ANY WARRANTY; without even the implied warranty of
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	15 GNU General Public License for more details.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	16
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	17 You should have received a copy of the GNU General Public License
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	18 along with GCC; see the file COPYING3. If not see
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	19 <http://www.gnu.org/licenses/>. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	20
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	21 #include "config.h"
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	22 #include "system.h"
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	23 #include "coretypes.h"
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	24 #include "backend.h"
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	25 #include "tree.h"
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	26 #include "gimple.h"
04ced10e8804 gcc 7 kono parents: 67 diff changeset	27 #include "tree-pass.h"
04ced10e8804 gcc 7 kono parents: 67 diff changeset	28 #include "ssa.h"
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	29 #include "gimple-pretty-print.h"
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	30 #include "diagnostic-core.h"
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	31 #include "fold-const.h"
04ced10e8804 gcc 7 kono parents: 67 diff changeset	32 #include "gimple-iterator.h"
04ced10e8804 gcc 7 kono parents: 67 diff changeset	33 #include "tree-ssa.h"
04ced10e8804 gcc 7 kono parents: 67 diff changeset	34 #include "tree-cfg.h"
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	35 #include "cfghooks.h"
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	36
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	37 /* This implements the pass that does predicate aware warning on uses of
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	38 possibly uninitialized variables. The pass first collects the set of
04ced10e8804 gcc 7 kono parents: 67 diff changeset	39 possibly uninitialized SSA names. For each such name, it walks through
04ced10e8804 gcc 7 kono parents: 67 diff changeset	40 all its immediate uses. For each immediate use, it rebuilds the condition
04ced10e8804 gcc 7 kono parents: 67 diff changeset	41 expression (the predicate) that guards the use. The predicate is then
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	42 examined to see if the variable is always defined under that same condition.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	43 This is done either by pruning the unrealizable paths that lead to the
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	44 default definitions or by checking if the predicate set that guards the
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	45 defining paths is a superset of the use predicate. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	46
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	47 /* Max PHI args we can handle in pass. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	48 const unsigned max_phi_args = 32;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	49
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	50 /* Pointer set of potentially undefined ssa names, i.e.,
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	51 ssa names that are defined by phi with operands that
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	52 are not defined or potentially undefined. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	53 static hash_set<tree> *possibly_undefined_names = 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	54
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	55 /* Bit mask handling macros. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	56 #define MASK_SET_BIT(mask, pos) mask \|= (1 << pos)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	57 #define MASK_TEST_BIT(mask, pos) (mask & (1 << pos))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	58 #define MASK_EMPTY(mask) (mask == 0)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	59
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	60 /* Returns the first bit position (starting from LSB)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	61 in mask that is non zero. Returns -1 if the mask is empty. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	62 static int
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	63 get_mask_first_set_bit (unsigned mask)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	64 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	65 int pos = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	66 if (mask == 0)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	67 return -1;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	68
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	69 while ((mask & (1 << pos)) == 0)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	70 pos++;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	71
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	72 return pos;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	73 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	74 #define MASK_FIRST_SET_BIT(mask) get_mask_first_set_bit (mask)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	75
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	76 /* Return true if T, an SSA_NAME, has an undefined value. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	77 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	78 has_undefined_value_p (tree t)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	79 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	80 return (ssa_undefined_value_p (t)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	81 \|\| (possibly_undefined_names
04ced10e8804 gcc 7 kono parents: 67 diff changeset	82 && possibly_undefined_names->contains (t)));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	83 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	84
04ced10e8804 gcc 7 kono parents: 67 diff changeset	85 /* Like has_undefined_value_p, but don't return true if TREE_NO_WARNING
04ced10e8804 gcc 7 kono parents: 67 diff changeset	86 is set on SSA_NAME_VAR. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	87
04ced10e8804 gcc 7 kono parents: 67 diff changeset	88 static inline bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	89 uninit_undefined_value_p (tree t)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	90 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	91 if (!has_undefined_value_p (t))
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	92 return false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	93 if (SSA_NAME_VAR (t) && TREE_NO_WARNING (SSA_NAME_VAR (t)))
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	94 return false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	95 return true;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	96 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	97
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	98 /* Emit warnings for uninitialized variables. This is done in two passes.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	99
04ced10e8804 gcc 7 kono parents: 67 diff changeset	100 The first pass notices real uses of SSA names with undefined values.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	101 Such uses are unconditionally uninitialized, and we can be certain that
04ced10e8804 gcc 7 kono parents: 67 diff changeset	102 such a use is a mistake. This pass is run before most optimizations,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	103 so that we catch as many as we can.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	104
04ced10e8804 gcc 7 kono parents: 67 diff changeset	105 The second pass follows PHI nodes to find uses that are potentially
04ced10e8804 gcc 7 kono parents: 67 diff changeset	106 uninitialized. In this case we can't necessarily prove that the use
04ced10e8804 gcc 7 kono parents: 67 diff changeset	107 is really uninitialized. This pass is run after most optimizations,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	108 so that we thread as many jumps and possible, and delete as much dead
04ced10e8804 gcc 7 kono parents: 67 diff changeset	109 code as possible, in order to reduce false positives. We also look
04ced10e8804 gcc 7 kono parents: 67 diff changeset	110 again for plain uninitialized variables, since optimization may have
04ced10e8804 gcc 7 kono parents: 67 diff changeset	111 changed conditionally uninitialized to unconditionally uninitialized. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	112
04ced10e8804 gcc 7 kono parents: 67 diff changeset	113 /* Emit a warning for EXPR based on variable VAR at the point in the
04ced10e8804 gcc 7 kono parents: 67 diff changeset	114 program T, an SSA_NAME, is used being uninitialized. The exact
04ced10e8804 gcc 7 kono parents: 67 diff changeset	115 warning text is in MSGID and DATA is the gimple stmt with info about
04ced10e8804 gcc 7 kono parents: 67 diff changeset	116 the location in source code. When DATA is a GIMPLE_PHI, PHIARG_IDX
04ced10e8804 gcc 7 kono parents: 67 diff changeset	117 gives which argument of the phi node to take the location from. WC
04ced10e8804 gcc 7 kono parents: 67 diff changeset	118 is the warning code. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	119
04ced10e8804 gcc 7 kono parents: 67 diff changeset	120 static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	121 warn_uninit (enum opt_code wc, tree t, tree expr, tree var,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	122 const char gmsgid, void data, location_t phiarg_loc)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	123 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	124 gimple context = (gimple ) data;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	125 location_t location, cfun_loc;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	126 expanded_location xloc, floc;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	127
04ced10e8804 gcc 7 kono parents: 67 diff changeset	128 /* Ignore COMPLEX_EXPR as initializing only a part of a complex
04ced10e8804 gcc 7 kono parents: 67 diff changeset	129 turns in a COMPLEX_EXPR with the not initialized part being
04ced10e8804 gcc 7 kono parents: 67 diff changeset	130 set to its previous (undefined) value. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	131 if (is_gimple_assign (context)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	132 && gimple_assign_rhs_code (context) == COMPLEX_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	133 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	134 if (!has_undefined_value_p (t))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	135 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	136
04ced10e8804 gcc 7 kono parents: 67 diff changeset	137 /* Anonymous SSA_NAMEs shouldn't be uninitialized, but ssa_undefined_value_p
04ced10e8804 gcc 7 kono parents: 67 diff changeset	138 can return true if the def stmt of anonymous SSA_NAME is COMPLEX_EXPR
04ced10e8804 gcc 7 kono parents: 67 diff changeset	139 created for conversion from scalar to complex. Use the underlying var of
04ced10e8804 gcc 7 kono parents: 67 diff changeset	140 the COMPLEX_EXPRs real part in that case. See PR71581. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	141 if (expr == NULL_TREE
04ced10e8804 gcc 7 kono parents: 67 diff changeset	142 && var == NULL_TREE
04ced10e8804 gcc 7 kono parents: 67 diff changeset	143 && SSA_NAME_VAR (t) == NULL_TREE
04ced10e8804 gcc 7 kono parents: 67 diff changeset	144 && is_gimple_assign (SSA_NAME_DEF_STMT (t))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	145 && gimple_assign_rhs_code (SSA_NAME_DEF_STMT (t)) == COMPLEX_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	146 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	147 tree v = gimple_assign_rhs1 (SSA_NAME_DEF_STMT (t));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	148 if (TREE_CODE (v) == SSA_NAME
04ced10e8804 gcc 7 kono parents: 67 diff changeset	149 && has_undefined_value_p (v)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	150 && zerop (gimple_assign_rhs2 (SSA_NAME_DEF_STMT (t))))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	151 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	152 expr = SSA_NAME_VAR (v);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	153 var = expr;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	154 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	155 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	156
04ced10e8804 gcc 7 kono parents: 67 diff changeset	157 if (expr == NULL_TREE)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	158 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	159
04ced10e8804 gcc 7 kono parents: 67 diff changeset	160 /* TREE_NO_WARNING either means we already warned, or the front end
04ced10e8804 gcc 7 kono parents: 67 diff changeset	161 wishes to suppress the warning. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	162 if ((context
04ced10e8804 gcc 7 kono parents: 67 diff changeset	163 && (gimple_no_warning_p (context)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	164 \|\| (gimple_assign_single_p (context)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	165 && TREE_NO_WARNING (gimple_assign_rhs1 (context)))))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	166 \|\| TREE_NO_WARNING (expr))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	167 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	168
04ced10e8804 gcc 7 kono parents: 67 diff changeset	169 if (context != NULL && gimple_has_location (context))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	170 location = gimple_location (context);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	171 else if (phiarg_loc != UNKNOWN_LOCATION)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	172 location = phiarg_loc;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	173 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	174 location = DECL_SOURCE_LOCATION (var);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	175 location = linemap_resolve_location (line_table, location,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	176 LRK_SPELLING_LOCATION, NULL);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	177 cfun_loc = DECL_SOURCE_LOCATION (cfun->decl);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	178 xloc = expand_location (location);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	179 floc = expand_location (cfun_loc);
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	180 auto_diagnostic_group d;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	181 if (warning_at (location, wc, gmsgid, expr))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	182 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	183 TREE_NO_WARNING (expr) = 1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	184
04ced10e8804 gcc 7 kono parents: 67 diff changeset	185 if (location == DECL_SOURCE_LOCATION (var))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	186 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	187 if (xloc.file != floc.file
04ced10e8804 gcc 7 kono parents: 67 diff changeset	188 \|\| linemap_location_before_p (line_table, location, cfun_loc)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	189 \|\| linemap_location_before_p (line_table, cfun->function_end_locus,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	190 location))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	191 inform (DECL_SOURCE_LOCATION (var), "%qD was declared here", var);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	192 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	193 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	194
04ced10e8804 gcc 7 kono parents: 67 diff changeset	195 struct check_defs_data
04ced10e8804 gcc 7 kono parents: 67 diff changeset	196 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	197 /* If we found any may-defs besides must-def clobbers. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	198 bool found_may_defs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	199 };
04ced10e8804 gcc 7 kono parents: 67 diff changeset	200
04ced10e8804 gcc 7 kono parents: 67 diff changeset	201 /* Callback for walk_aliased_vdefs. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	202
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	203 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	204 check_defs (ao_ref ref, tree vdef, void data_)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	205 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	206 check_defs_data data = (check_defs_data )data_;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	207 gimple *def_stmt = SSA_NAME_DEF_STMT (vdef);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	208 /* If this is a clobber then if it is not a kill walk past it. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	209 if (gimple_clobber_p (def_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	210 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	211 if (stmt_kills_ref_p (def_stmt, ref))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	212 return true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	213 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	214 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	215 /* Found a may-def on this path. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	216 data->found_may_defs = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	217 return true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	218 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	219
04ced10e8804 gcc 7 kono parents: 67 diff changeset	220 static unsigned int
04ced10e8804 gcc 7 kono parents: 67 diff changeset	221 warn_uninitialized_vars (bool warn_possibly_uninitialized)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	222 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	223 gimple_stmt_iterator gsi;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	224 basic_block bb;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	225 unsigned int vdef_cnt = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	226 unsigned int oracle_cnt = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	227 unsigned limit = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	228
04ced10e8804 gcc 7 kono parents: 67 diff changeset	229 FOR_EACH_BB_FN (bb, cfun)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	230 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	231 basic_block succ = single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	232 bool always_executed = dominated_by_p (CDI_POST_DOMINATORS, succ, bb);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	233 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	234 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	235 gimple *stmt = gsi_stmt (gsi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	236 use_operand_p use_p;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	237 ssa_op_iter op_iter;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	238 tree use;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	239
04ced10e8804 gcc 7 kono parents: 67 diff changeset	240 if (is_gimple_debug (stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	241 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	242
04ced10e8804 gcc 7 kono parents: 67 diff changeset	243 /* We only do data flow with SSA_NAMEs, so that's all we
04ced10e8804 gcc 7 kono parents: 67 diff changeset	244 can warn about. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	245 FOR_EACH_SSA_USE_OPERAND (use_p, stmt, op_iter, SSA_OP_USE)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	246 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	247 /* BIT_INSERT_EXPR first operand should not be considered
04ced10e8804 gcc 7 kono parents: 67 diff changeset	248 a use for the purpose of uninit warnings. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	249 if (gassign ass = dyn_cast <gassign > (stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	250 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	251 if (gimple_assign_rhs_code (ass) == BIT_INSERT_EXPR
04ced10e8804 gcc 7 kono parents: 67 diff changeset	252 && use_p->use == gimple_assign_rhs1_ptr (ass))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	253 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	254 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	255 use = USE_FROM_PTR (use_p);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	256 if (always_executed)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	257 warn_uninit (OPT_Wuninitialized, use, SSA_NAME_VAR (use),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	258 SSA_NAME_VAR (use),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	259 "%qD is used uninitialized in this function", stmt,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	260 UNKNOWN_LOCATION);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	261 else if (warn_possibly_uninitialized)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	262 warn_uninit (OPT_Wmaybe_uninitialized, use, SSA_NAME_VAR (use),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	263 SSA_NAME_VAR (use),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	264 "%qD may be used uninitialized in this function",
04ced10e8804 gcc 7 kono parents: 67 diff changeset	265 stmt, UNKNOWN_LOCATION);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	266 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	267
04ced10e8804 gcc 7 kono parents: 67 diff changeset	268 /* For limiting the alias walk below we count all
04ced10e8804 gcc 7 kono parents: 67 diff changeset	269 vdefs in the function. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	270 if (gimple_vdef (stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	271 vdef_cnt++;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	272
04ced10e8804 gcc 7 kono parents: 67 diff changeset	273 if (gimple_assign_load_p (stmt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	274 && gimple_has_location (stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	275 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	276 tree rhs = gimple_assign_rhs1 (stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	277 tree lhs = gimple_assign_lhs (stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	278 bool has_bit_insert = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	279 use_operand_p luse_p;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	280 imm_use_iterator liter;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	281
04ced10e8804 gcc 7 kono parents: 67 diff changeset	282 if (TREE_NO_WARNING (rhs))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	283 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	284
04ced10e8804 gcc 7 kono parents: 67 diff changeset	285 ao_ref ref;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	286 ao_ref_init (&ref, rhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	287
04ced10e8804 gcc 7 kono parents: 67 diff changeset	288 /* Do not warn if the base was marked so or this is a
04ced10e8804 gcc 7 kono parents: 67 diff changeset	289 hard register var. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	290 tree base = ao_ref_base (&ref);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	291 if ((VAR_P (base)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	292 && DECL_HARD_REGISTER (base))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	293 \|\| TREE_NO_WARNING (base))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	294 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	295
04ced10e8804 gcc 7 kono parents: 67 diff changeset	296 /* Do not warn if the access is fully outside of the
04ced10e8804 gcc 7 kono parents: 67 diff changeset	297 variable. */
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	298 poly_int64 decl_size;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	299 if (DECL_P (base)
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	300 && known_size_p (ref.size)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	301 && ((known_eq (ref.max_size, ref.size)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	302 && known_le (ref.offset + ref.size, 0))
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	303 \|\| (known_ge (ref.offset, 0)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	304 && DECL_SIZE (base)
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	305 && poly_int_tree_p (DECL_SIZE (base), &decl_size)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	306 && known_le (decl_size, ref.offset))))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	307 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	308
04ced10e8804 gcc 7 kono parents: 67 diff changeset	309 /* Do not warn if the access is then used for a BIT_INSERT_EXPR. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	310 if (TREE_CODE (lhs) == SSA_NAME)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	311 FOR_EACH_IMM_USE_FAST (luse_p, liter, lhs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	312 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	313 gimple *use_stmt = USE_STMT (luse_p);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	314 /* BIT_INSERT_EXPR first operand should not be considered
04ced10e8804 gcc 7 kono parents: 67 diff changeset	315 a use for the purpose of uninit warnings. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	316 if (gassign ass = dyn_cast <gassign > (use_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	317 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	318 if (gimple_assign_rhs_code (ass) == BIT_INSERT_EXPR
04ced10e8804 gcc 7 kono parents: 67 diff changeset	319 && luse_p->use == gimple_assign_rhs1_ptr (ass))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	320 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	321 has_bit_insert = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	322 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	323 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	324 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	325 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	326 if (has_bit_insert)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	327 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	328
04ced10e8804 gcc 7 kono parents: 67 diff changeset	329 /* Limit the walking to a constant number of stmts after
04ced10e8804 gcc 7 kono parents: 67 diff changeset	330 we overcommit quadratic behavior for small functions
04ced10e8804 gcc 7 kono parents: 67 diff changeset	331 and O(n) behavior. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	332 if (oracle_cnt > 128 * 128
04ced10e8804 gcc 7 kono parents: 67 diff changeset	333 && oracle_cnt > vdef_cnt * 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	334 limit = 32;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	335 check_defs_data data;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	336 bool fentry_reached = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	337 data.found_may_defs = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	338 use = gimple_vuse (stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	339 int res = walk_aliased_vdefs (&ref, use,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	340 check_defs, &data, NULL,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	341 &fentry_reached, limit);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	342 if (res == -1)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	343 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	344 oracle_cnt += limit;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	345 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	346 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	347 oracle_cnt += res;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	348 if (data.found_may_defs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	349 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	350 /* Do not warn if it can be initialized outside this function.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	351 If we did not reach function entry then we found killing
04ced10e8804 gcc 7 kono parents: 67 diff changeset	352 clobbers on all paths to entry. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	353 if (fentry_reached
04ced10e8804 gcc 7 kono parents: 67 diff changeset	354 /* ??? We'd like to use ref_may_alias_global_p but that
04ced10e8804 gcc 7 kono parents: 67 diff changeset	355 excludes global readonly memory and thus we get bougs
04ced10e8804 gcc 7 kono parents: 67 diff changeset	356 warnings from p = cond ? "a" : "b" for example. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	357 && (!VAR_P (base)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	358 \|\| is_global_var (base)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	359 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	360
04ced10e8804 gcc 7 kono parents: 67 diff changeset	361 /* We didn't find any may-defs so on all paths either
04ced10e8804 gcc 7 kono parents: 67 diff changeset	362 reached function entry or a killing clobber. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	363 location_t location
04ced10e8804 gcc 7 kono parents: 67 diff changeset	364 = linemap_resolve_location (line_table, gimple_location (stmt),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	365 LRK_SPELLING_LOCATION, NULL);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	366 if (always_executed)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	367 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	368 if (warning_at (location, OPT_Wuninitialized,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	369 "%qE is used uninitialized in this function",
04ced10e8804 gcc 7 kono parents: 67 diff changeset	370 rhs))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	371 /* ??? This is only effective for decls as in
04ced10e8804 gcc 7 kono parents: 67 diff changeset	372 gcc.dg/uninit-B-O0.c. Avoid doing this for
04ced10e8804 gcc 7 kono parents: 67 diff changeset	373 maybe-uninit uses as it may hide important
04ced10e8804 gcc 7 kono parents: 67 diff changeset	374 locations. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	375 TREE_NO_WARNING (rhs) = 1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	376 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	377 else if (warn_possibly_uninitialized)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	378 warning_at (location, OPT_Wmaybe_uninitialized,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	379 "%qE may be used uninitialized in this function",
04ced10e8804 gcc 7 kono parents: 67 diff changeset	380 rhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	381 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	382 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	383 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	384
04ced10e8804 gcc 7 kono parents: 67 diff changeset	385 return 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	386 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	387
04ced10e8804 gcc 7 kono parents: 67 diff changeset	388 /* Checks if the operand OPND of PHI is defined by
04ced10e8804 gcc 7 kono parents: 67 diff changeset	389 another phi with one operand defined by this PHI,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	390 but the rest operands are all defined. If yes,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	391 returns true to skip this operand as being
04ced10e8804 gcc 7 kono parents: 67 diff changeset	392 redundant. Can be enhanced to be more general. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	393
04ced10e8804 gcc 7 kono parents: 67 diff changeset	394 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	395 can_skip_redundant_opnd (tree opnd, gimple *phi)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	396 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	397 gimple *op_def;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	398 tree phi_def;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	399 int i, n;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	400
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	401 phi_def = gimple_phi_result (phi);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	402 op_def = SSA_NAME_DEF_STMT (opnd);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	403 if (gimple_code (op_def) != GIMPLE_PHI)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	404 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	405 n = gimple_phi_num_args (op_def);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	406 for (i = 0; i < n; ++i)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	407 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	408 tree op = gimple_phi_arg_def (op_def, i);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	409 if (TREE_CODE (op) != SSA_NAME)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	410 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	411 if (op != phi_def && uninit_undefined_value_p (op))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	412 return false;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	413 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	414
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	415 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	416 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	417
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	418 /* Returns a bit mask holding the positions of arguments in PHI
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	419 that have empty (or possibly empty) definitions. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	420
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	421 static unsigned
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	422 compute_uninit_opnds_pos (gphi *phi)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	423 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	424 size_t i, n;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	425 unsigned uninit_opnds = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	426
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	427 n = gimple_phi_num_args (phi);
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	428 /* Bail out for phi with too many args. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	429 if (n > max_phi_args)
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	430 return 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	431
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	432 for (i = 0; i < n; ++i)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	433 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	434 tree op = gimple_phi_arg_def (phi, i);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	435 if (TREE_CODE (op) == SSA_NAME
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	436 && uninit_undefined_value_p (op)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	437 && !can_skip_redundant_opnd (op, phi))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	438 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	439 if (cfun->has_nonlocal_label \|\| cfun->calls_setjmp)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	440 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	441 /* Ignore SSA_NAMEs that appear on abnormal edges
04ced10e8804 gcc 7 kono parents: 67 diff changeset	442 somewhere. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	443 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	444 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	445 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	446 MASK_SET_BIT (uninit_opnds, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	447 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	448 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	449 return uninit_opnds;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	450 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	451
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	452 /* Find the immediate postdominator PDOM of the specified
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	453 basic block BLOCK. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	454
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	455 static inline basic_block
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	456 find_pdom (basic_block block)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	457 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	458 if (block == EXIT_BLOCK_PTR_FOR_FN (cfun))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	459 return EXIT_BLOCK_PTR_FOR_FN (cfun);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	460 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	461 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	462 basic_block bb = get_immediate_dominator (CDI_POST_DOMINATORS, block);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	463 if (!bb)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	464 return EXIT_BLOCK_PTR_FOR_FN (cfun);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	465 return bb;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	466 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	467 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	468
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	469 /* Find the immediate DOM of the specified basic block BLOCK. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	470
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	471 static inline basic_block
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	472 find_dom (basic_block block)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	473 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	474 if (block == ENTRY_BLOCK_PTR_FOR_FN (cfun))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	475 return ENTRY_BLOCK_PTR_FOR_FN (cfun);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	476 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	477 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	478 basic_block bb = get_immediate_dominator (CDI_DOMINATORS, block);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	479 if (!bb)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	480 return ENTRY_BLOCK_PTR_FOR_FN (cfun);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	481 return bb;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	482 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	483 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	484
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	485 /* Returns true if BB1 is postdominating BB2 and BB1 is
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	486 not a loop exit bb. The loop exit bb check is simple and does
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	487 not cover all cases. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	488
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	489 static bool
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	490 is_non_loop_exit_postdominating (basic_block bb1, basic_block bb2)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	491 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	492 if (!dominated_by_p (CDI_POST_DOMINATORS, bb2, bb1))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	493 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	494
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	495 if (single_pred_p (bb1) && !single_succ_p (bb2))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	496 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	497
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	498 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	499 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	500
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	501 /* Find the closest postdominator of a specified BB, which is control
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	502 equivalent to BB. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	503
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	504 static inline basic_block
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	505 find_control_equiv_block (basic_block bb)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	506 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	507 basic_block pdom;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	508
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	509 pdom = find_pdom (bb);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	510
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	511 /* Skip the postdominating bb that is also loop exit. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	512 if (!is_non_loop_exit_postdominating (pdom, bb))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	513 return NULL;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	514
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	515 if (dominated_by_p (CDI_DOMINATORS, pdom, bb))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	516 return pdom;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	517
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	518 return NULL;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	519 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	520
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	521 #define MAX_NUM_CHAINS 8
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	522 #define MAX_CHAIN_LEN 5
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	523 #define MAX_POSTDOM_CHECK 8
04ced10e8804 gcc 7 kono parents: 67 diff changeset	524 #define MAX_SWITCH_CASES 40
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	525
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	526 /* Computes the control dependence chains (paths of edges)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	527 for DEP_BB up to the dominating basic block BB (the head node of a
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	528 chain should be dominated by it). CD_CHAINS is pointer to an
04ced10e8804 gcc 7 kono parents: 67 diff changeset	529 array holding the result chains. CUR_CD_CHAIN is the current
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	530 chain being computed. *NUM_CHAINS is total number of chains. The
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	531 function returns true if the information is successfully computed,
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	532 return false if there is no control dependence or not computed. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	533
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	534 static bool
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	535 compute_control_dep_chain (basic_block bb, basic_block dep_bb,
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	536 vec<edge> *cd_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	537 size_t *num_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	538 vec<edge> *cur_cd_chain,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	539 int *num_calls)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	540 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	541 edge_iterator ei;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	542 edge e;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	543 size_t i;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	544 bool found_cd_chain = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	545 size_t cur_chain_len = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	546
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	547 if (*num_calls > param_uninit_control_dep_attempts)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	548 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	549 ++*num_calls;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	550
04ced10e8804 gcc 7 kono parents: 67 diff changeset	551 /* Could use a set instead. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	552 cur_chain_len = cur_cd_chain->length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	553 if (cur_chain_len > MAX_CHAIN_LEN)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	554 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	555
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	556 for (i = 0; i < cur_chain_len; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	557 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	558 edge e = (*cur_cd_chain)[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	559 /* Cycle detected. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	560 if (e->src == bb)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	561 return false;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	562 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	563
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	564 FOR_EACH_EDGE (e, ei, bb->succs)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	565 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	566 basic_block cd_bb;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	567 int post_dom_check = 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	568 if (e->flags & (EDGE_FAKE \| EDGE_ABNORMAL))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	569 continue;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	570
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	571 cd_bb = e->dest;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	572 cur_cd_chain->safe_push (e);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	573 while (!is_non_loop_exit_postdominating (cd_bb, bb))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	574 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	575 if (cd_bb == dep_bb)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	576 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	577 /* Found a direct control dependence. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	578 if (*num_chains < MAX_NUM_CHAINS)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	579 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	580 cd_chains[*num_chains] = cur_cd_chain->copy ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	581 (*num_chains)++;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	582 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	583 found_cd_chain = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	584 /* Check path from next edge. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	585 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	586 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	587
04ced10e8804 gcc 7 kono parents: 67 diff changeset	588 /* Now check if DEP_BB is indirectly control dependent on BB. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	589 if (compute_control_dep_chain (cd_bb, dep_bb, cd_chains, num_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	590 cur_cd_chain, num_calls))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	591 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	592 found_cd_chain = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	593 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	594 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	595
04ced10e8804 gcc 7 kono parents: 67 diff changeset	596 cd_bb = find_pdom (cd_bb);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	597 post_dom_check++;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	598 if (cd_bb == EXIT_BLOCK_PTR_FOR_FN (cfun)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	599 \|\| post_dom_check > MAX_POSTDOM_CHECK)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	600 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	601 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	602 cur_cd_chain->pop ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	603 gcc_assert (cur_cd_chain->length () == cur_chain_len);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	604 }
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	605 gcc_assert (cur_cd_chain->length () == cur_chain_len);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	606
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	607 return found_cd_chain;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	608 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	609
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	610 /* The type to represent a simple predicate. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	611
04ced10e8804 gcc 7 kono parents: 67 diff changeset	612 struct pred_info
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	613 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	614 tree pred_lhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	615 tree pred_rhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	616 enum tree_code cond_code;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	617 bool invert;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	618 };
04ced10e8804 gcc 7 kono parents: 67 diff changeset	619
04ced10e8804 gcc 7 kono parents: 67 diff changeset	620 /* The type to represent a sequence of predicates grouped
04ced10e8804 gcc 7 kono parents: 67 diff changeset	621 with .AND. operation. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	622
04ced10e8804 gcc 7 kono parents: 67 diff changeset	623 typedef vec<pred_info, va_heap, vl_ptr> pred_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	624
04ced10e8804 gcc 7 kono parents: 67 diff changeset	625 /* The type to represent a sequence of pred_chains grouped
04ced10e8804 gcc 7 kono parents: 67 diff changeset	626 with .OR. operation. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	627
04ced10e8804 gcc 7 kono parents: 67 diff changeset	628 typedef vec<pred_chain, va_heap, vl_ptr> pred_chain_union;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	629
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	630 /* Converts the chains of control dependence edges into a set of
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	631 predicates. A control dependence chain is represented by a vector
04ced10e8804 gcc 7 kono parents: 67 diff changeset	632 edges. DEP_CHAINS points to an array of dependence chains.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	633 NUM_CHAINS is the size of the chain array. One edge in a dependence
04ced10e8804 gcc 7 kono parents: 67 diff changeset	634 chain is mapped to predicate expression represented by pred_info
04ced10e8804 gcc 7 kono parents: 67 diff changeset	635 type. One dependence chain is converted to a composite predicate that
04ced10e8804 gcc 7 kono parents: 67 diff changeset	636 is the result of AND operation of pred_info mapped to each edge.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	637 A composite predicate is presented by a vector of pred_info. On
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	638 return, *PREDS points to the resulting array of composite predicates.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	639 NUM_PREDS is the number of composite predictes. /
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	640
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	641 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	642 convert_control_dep_chain_into_preds (vec<edge> *dep_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	643 size_t num_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	644 pred_chain_union *preds)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	645 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	646 bool has_valid_pred = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	647 size_t i, j;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	648 if (num_chains == 0 \|\| num_chains >= MAX_NUM_CHAINS)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	649 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	650
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	651 /* Now convert the control dep chain into a set
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	652 of predicates. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	653 preds->reserve (num_chains);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	654
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	655 for (i = 0; i < num_chains; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	656 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	657 vec<edge> one_cd_chain = dep_chains[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	658
04ced10e8804 gcc 7 kono parents: 67 diff changeset	659 has_valid_pred = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	660 pred_chain t_chain = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	661 for (j = 0; j < one_cd_chain.length (); j++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	662 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	663 gimple *cond_stmt;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	664 gimple_stmt_iterator gsi;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	665 basic_block guard_bb;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	666 pred_info one_pred;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	667 edge e;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	668
04ced10e8804 gcc 7 kono parents: 67 diff changeset	669 e = one_cd_chain[j];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	670 guard_bb = e->src;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	671 gsi = gsi_last_bb (guard_bb);
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	672 /* Ignore empty forwarder blocks. */
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	673 if (empty_block_p (guard_bb) && single_succ_p (guard_bb))
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	674 continue;
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	675 /* An empty basic block here is likely a PHI, and is not one
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	676 of the cases we handle below. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	677 if (gsi_end_p (gsi))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	678 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	679 has_valid_pred = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	680 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	681 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	682 cond_stmt = gsi_stmt (gsi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	683 if (is_gimple_call (cond_stmt) && EDGE_COUNT (e->src->succs) >= 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	684 /* Ignore EH edge. Can add assertion on the other edge's flag. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	685 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	686 /* Skip if there is essentially one succesor. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	687 if (EDGE_COUNT (e->src->succs) == 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	688 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	689 edge e1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	690 edge_iterator ei1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	691 bool skip = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	692
04ced10e8804 gcc 7 kono parents: 67 diff changeset	693 FOR_EACH_EDGE (e1, ei1, e->src->succs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	694 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	695 if (EDGE_COUNT (e1->dest->succs) == 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	696 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	697 skip = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	698 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	699 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	700 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	701 if (skip)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	702 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	703 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	704 if (gimple_code (cond_stmt) == GIMPLE_COND)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	705 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	706 one_pred.pred_lhs = gimple_cond_lhs (cond_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	707 one_pred.pred_rhs = gimple_cond_rhs (cond_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	708 one_pred.cond_code = gimple_cond_code (cond_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	709 one_pred.invert = !!(e->flags & EDGE_FALSE_VALUE);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	710 t_chain.safe_push (one_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	711 has_valid_pred = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	712 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	713 else if (gswitch gs = dyn_cast<gswitch > (cond_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	714 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	715 /* Avoid quadratic behavior. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	716 if (gimple_switch_num_labels (gs) > MAX_SWITCH_CASES)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	717 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	718 has_valid_pred = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	719 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	720 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	721 /* Find the case label. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	722 tree l = NULL_TREE;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	723 unsigned idx;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	724 for (idx = 0; idx < gimple_switch_num_labels (gs); ++idx)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	725 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	726 tree tl = gimple_switch_label (gs, idx);
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	727 if (e->dest == label_to_block (cfun, CASE_LABEL (tl)))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	728 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	729 if (!l)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	730 l = tl;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	731 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	732 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	733 l = NULL_TREE;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	734 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	735 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	736 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	737 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	738 /* If more than one label reaches this block or the case
04ced10e8804 gcc 7 kono parents: 67 diff changeset	739 label doesn't have a single value (like the default one)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	740 fail. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	741 if (!l
04ced10e8804 gcc 7 kono parents: 67 diff changeset	742 \|\| !CASE_LOW (l)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	743 \|\| (CASE_HIGH (l)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	744 && !operand_equal_p (CASE_LOW (l), CASE_HIGH (l), 0)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	745 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	746 has_valid_pred = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	747 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	748 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	749 one_pred.pred_lhs = gimple_switch_index (gs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	750 one_pred.pred_rhs = CASE_LOW (l);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	751 one_pred.cond_code = EQ_EXPR;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	752 one_pred.invert = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	753 t_chain.safe_push (one_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	754 has_valid_pred = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	755 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	756 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	757 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	758 has_valid_pred = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	759 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	760 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	761 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	762
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	763 if (!has_valid_pred)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	764 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	765 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	766 preds->safe_push (t_chain);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	767 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	768 return has_valid_pred;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	769 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	770
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	771 /* Computes all control dependence chains for USE_BB. The control
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	772 dependence chains are then converted to an array of composite
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	773 predicates pointed to by PREDS. PHI_BB is the basic block of
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	774 the phi whose result is used in USE_BB. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	775
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	776 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	777 find_predicates (pred_chain_union *preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	778 basic_block phi_bb,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	779 basic_block use_bb)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	780 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	781 size_t num_chains = 0, i;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	782 int num_calls = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	783 vec<edge> dep_chains[MAX_NUM_CHAINS];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	784 auto_vec<edge, MAX_CHAIN_LEN + 1> cur_chain;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	785 bool has_valid_pred = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	786 basic_block cd_root = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	787
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	788 /* First find the closest bb that is control equivalent to PHI_BB
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	789 that also dominates USE_BB. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	790 cd_root = phi_bb;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	791 while (dominated_by_p (CDI_DOMINATORS, use_bb, cd_root))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	792 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	793 basic_block ctrl_eq_bb = find_control_equiv_block (cd_root);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	794 if (ctrl_eq_bb && dominated_by_p (CDI_DOMINATORS, use_bb, ctrl_eq_bb))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	795 cd_root = ctrl_eq_bb;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	796 else
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	797 break;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	798 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	799
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	800 compute_control_dep_chain (cd_root, use_bb, dep_chains, &num_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	801 &cur_chain, &num_calls);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	802
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	803 has_valid_pred
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	804 = convert_control_dep_chain_into_preds (dep_chains, num_chains, preds);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	805 for (i = 0; i < num_chains; i++)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	806 dep_chains[i].release ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	807 return has_valid_pred;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	808 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	809
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	810 /* Computes the set of incoming edges of PHI that have non empty
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	811 definitions of a phi chain. The collection will be done
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	812 recursively on operands that are defined by phis. CD_ROOT
04ced10e8804 gcc 7 kono parents: 67 diff changeset	813 is the control dependence root. *EDGES holds the result, and
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	814 VISITED_PHIS is a pointer set for detecting cycles. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	815
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	816 static void
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	817 collect_phi_def_edges (gphi *phi, basic_block cd_root,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	818 auto_vec<edge> *edges,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	819 hash_set<gimple > visited_phis)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	820 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	821 size_t i, n;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	822 edge opnd_edge;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	823 tree opnd;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	824
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	825 if (visited_phis->add (phi))
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	826 return;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	827
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	828 n = gimple_phi_num_args (phi);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	829 for (i = 0; i < n; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	830 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	831 opnd_edge = gimple_phi_arg_edge (phi, i);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	832 opnd = gimple_phi_arg_def (phi, i);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	833
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	834 if (TREE_CODE (opnd) != SSA_NAME)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	835 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	836 if (dump_file && (dump_flags & TDF_DETAILS))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	837 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	838 fprintf (dump_file, "\n[CHECK] Found def edge %d in ", (int) i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	839 print_gimple_stmt (dump_file, phi, 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	840 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	841 edges->safe_push (opnd_edge);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	842 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	843 else
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	844 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	845 gimple *def = SSA_NAME_DEF_STMT (opnd);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	846
04ced10e8804 gcc 7 kono parents: 67 diff changeset	847 if (gimple_code (def) == GIMPLE_PHI
04ced10e8804 gcc 7 kono parents: 67 diff changeset	848 && dominated_by_p (CDI_DOMINATORS, gimple_bb (def), cd_root))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	849 collect_phi_def_edges (as_a<gphi *> (def), cd_root, edges,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	850 visited_phis);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	851 else if (!uninit_undefined_value_p (opnd))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	852 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	853 if (dump_file && (dump_flags & TDF_DETAILS))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	854 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	855 fprintf (dump_file, "\n[CHECK] Found def edge %d in ",
04ced10e8804 gcc 7 kono parents: 67 diff changeset	856 (int) i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	857 print_gimple_stmt (dump_file, phi, 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	858 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	859 edges->safe_push (opnd_edge);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	860 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	861 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	862 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	863 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	864
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	865 /* For each use edge of PHI, computes all control dependence chains.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	866 The control dependence chains are then converted to an array of
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	867 composite predicates pointed to by PREDS. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	868
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	869 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	870 find_def_preds (pred_chain_union preds, gphi phi)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	871 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	872 size_t num_chains = 0, i, n;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	873 vec<edge> dep_chains[MAX_NUM_CHAINS];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	874 auto_vec<edge, MAX_CHAIN_LEN + 1> cur_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	875 auto_vec<edge> def_edges;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	876 bool has_valid_pred = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	877 basic_block phi_bb, cd_root = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	878
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	879 phi_bb = gimple_bb (phi);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	880 /* First find the closest dominating bb to be
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	881 the control dependence root. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	882 cd_root = find_dom (phi_bb);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	883 if (!cd_root)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	884 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	885
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	886 hash_set<gimple *> visited_phis;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	887 collect_phi_def_edges (phi, cd_root, &def_edges, &visited_phis);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	888
04ced10e8804 gcc 7 kono parents: 67 diff changeset	889 n = def_edges.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	890 if (n == 0)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	891 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	892
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	893 for (i = 0; i < n; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	894 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	895 size_t prev_nc, j;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	896 int num_calls = 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	897 edge opnd_edge;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	898
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	899 opnd_edge = def_edges[i];
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	900 prev_nc = num_chains;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	901 compute_control_dep_chain (cd_root, opnd_edge->src, dep_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	902 &num_chains, &cur_chain, &num_calls);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	903
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	904 /* Now update the newly added chains with
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	905 the phi operand edge: */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	906 if (EDGE_COUNT (opnd_edge->src->succs) > 1)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	907 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	908 if (prev_nc == num_chains && num_chains < MAX_NUM_CHAINS)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	909 dep_chains[num_chains++] = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	910 for (j = prev_nc; j < num_chains; j++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	911 dep_chains[j].safe_push (opnd_edge);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	912 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	913 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	914
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	915 has_valid_pred
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	916 = convert_control_dep_chain_into_preds (dep_chains, num_chains, preds);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	917 for (i = 0; i < num_chains; i++)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	918 dep_chains[i].release ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	919 return has_valid_pred;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	920 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	921
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	922 /* Dump a pred_info. */
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	923
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	924 static void
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	925 dump_pred_info (pred_info one_pred)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	926 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	927 if (one_pred.invert)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	928 fprintf (dump_file, " (.NOT.) ");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	929 print_generic_expr (dump_file, one_pred.pred_lhs);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	930 fprintf (dump_file, " %s ", op_symbol_code (one_pred.cond_code));
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	931 print_generic_expr (dump_file, one_pred.pred_rhs);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	932 }
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	933
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	934 /* Dump a pred_chain. */
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	935
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	936 static void
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	937 dump_pred_chain (pred_chain one_pred_chain)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	938 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	939 size_t np = one_pred_chain.length ();
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	940 for (size_t j = 0; j < np; j++)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	941 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	942 dump_pred_info (one_pred_chain[j]);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	943 if (j < np - 1)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	944 fprintf (dump_file, " (.AND.) ");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	945 else
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	946 fprintf (dump_file, "\n");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	947 }
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	948 }
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	949
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	950 /* Dumps the predicates (PREDS) for USESTMT. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	951
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	952 static void
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	953 dump_predicates (gimple usestmt, pred_chain_union preds, const char msg)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	954 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	955 fprintf (dump_file, "%s", msg);
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	956 if (usestmt)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	957 {
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	958 print_gimple_stmt (dump_file, usestmt, 0);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	959 fprintf (dump_file, "is guarded by :\n\n");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	960 }
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	961 size_t num_preds = preds.length ();
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	962 for (size_t i = 0; i < num_preds; i++)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	963 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	964 dump_pred_chain (preds[i]);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	965 if (i < num_preds - 1)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	966 fprintf (dump_file, "(.OR.)\n");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	967 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	968 fprintf (dump_file, "\n\n");
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	969 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	970 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	971
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	972 /* Destroys the predicate set PREDS. /
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	973
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	974 static void
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	975 destroy_predicate_vecs (pred_chain_union *preds)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	976 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	977 size_t i;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	978
04ced10e8804 gcc 7 kono parents: 67 diff changeset	979 size_t n = preds->length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	980 for (i = 0; i < n; i++)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	981 (*preds)[i].release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	982 preds->release ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	983 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	984
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	985 /* Computes the 'normalized' conditional code with operand
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	986 swapping and condition inversion. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	987
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	988 static enum tree_code
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	989 get_cmp_code (enum tree_code orig_cmp_code, bool swap_cond, bool invert)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	990 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	991 enum tree_code tc = orig_cmp_code;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	992
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	993 if (swap_cond)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	994 tc = swap_tree_comparison (orig_cmp_code);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	995 if (invert)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	996 tc = invert_tree_comparison (tc, false);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	997
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	998 switch (tc)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	999 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1000 case LT_EXPR:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1001 case LE_EXPR:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1002 case GT_EXPR:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1003 case GE_EXPR:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1004 case EQ_EXPR:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1005 case NE_EXPR:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1006 break;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1007 default:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1008 return ERROR_MARK;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1009 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1010 return tc;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1011 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1012
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1013 /* Returns whether VAL CMPC BOUNDARY is true. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1014
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1015 static bool
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1016 is_value_included_in (tree val, tree boundary, enum tree_code cmpc)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1017 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1018 bool inverted = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1019 bool result;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1020
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1021 /* Only handle integer constant here. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1022 if (TREE_CODE (val) != INTEGER_CST \|\| TREE_CODE (boundary) != INTEGER_CST)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1023 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1024
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1025 if (cmpc == GE_EXPR \|\| cmpc == GT_EXPR \|\| cmpc == NE_EXPR)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1026 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1027 cmpc = invert_tree_comparison (cmpc, false);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1028 inverted = true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1029 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1030
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1031 if (cmpc == EQ_EXPR)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1032 result = tree_int_cst_equal (val, boundary);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1033 else if (cmpc == LT_EXPR)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1034 result = tree_int_cst_lt (val, boundary);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1035 else
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1036 {
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1037 gcc_assert (cmpc == LE_EXPR);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1038 result = tree_int_cst_le (val, boundary);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1039 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1040
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1041 if (inverted)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1042 result ^= 1;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1043
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1044 return result;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1045 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1046
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1047 /* Returns whether VAL satisfies (x CMPC BOUNDARY) predicate. CMPC can be
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1048 either one of the range comparison codes ({GE,LT,EQ,NE}_EXPR and the like),
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1049 or BIT_AND_EXPR. EXACT_P is only meaningful for the latter. It modifies the
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1050 question from whether VAL & BOUNDARY != 0 to whether VAL & BOUNDARY == VAL.
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1051 For other values of CMPC, EXACT_P is ignored. */
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1052
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1053 static bool
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1054 value_sat_pred_p (tree val, tree boundary, enum tree_code cmpc,
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1055 bool exact_p = false)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1056 {
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1057 if (cmpc != BIT_AND_EXPR)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1058 return is_value_included_in (val, boundary, cmpc);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1059
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1060 wide_int andw = wi::to_wide (val) & wi::to_wide (boundary);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1061 if (exact_p)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1062 return andw == wi::to_wide (val);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1063 else
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1064 return andw.to_uhwi ();
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1065 }
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1066
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1067 /* Returns true if PRED is common among all the predicate
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1068 chains (PREDS) (and therefore can be factored out).
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1069 NUM_PRED_CHAIN is the size of array PREDS. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1070
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1071 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1072 find_matching_predicate_in_rest_chains (pred_info pred,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1073 pred_chain_union preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1074 size_t num_pred_chains)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1075 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1076 size_t i, j, n;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1077
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1078 /* Trival case. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1079 if (num_pred_chains == 1)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1080 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1081
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1082 for (i = 1; i < num_pred_chains; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1083 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1084 bool found = false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1085 pred_chain one_chain = preds[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1086 n = one_chain.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1087 for (j = 0; j < n; j++)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1088 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1089 pred_info pred2 = one_chain[j];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1090 /* Can relax the condition comparison to not
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1091 use address comparison. However, the most common
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1092 case is that multiple control dependent paths share
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1093 a common path prefix, so address comparison should
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1094 be ok. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1095
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1096 if (operand_equal_p (pred2.pred_lhs, pred.pred_lhs, 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1097 && operand_equal_p (pred2.pred_rhs, pred.pred_rhs, 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1098 && pred2.invert == pred.invert)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1099 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1100 found = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1101 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1102 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1103 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1104 if (!found)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1105 return false;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1106 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1107 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1108 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1109
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1110 /* Forward declaration. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1111 static bool is_use_properly_guarded (gimple *use_stmt,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1112 basic_block use_bb,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1113 gphi *phi,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1114 unsigned uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1115 pred_chain_union *def_preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1116 hash_set<gphi > visited_phis);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1117
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1118 /* Returns true if all uninitialized opnds are pruned. Returns false
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1119 otherwise. PHI is the phi node with uninitialized operands,
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1120 UNINIT_OPNDS is the bitmap of the uninitialize operand positions,
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1121 FLAG_DEF is the statement defining the flag guarding the use of the
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1122 PHI output, BOUNDARY_CST is the const value used in the predicate
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1123 associated with the flag, CMP_CODE is the comparison code used in
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1124 the predicate, VISITED_PHIS is the pointer set of phis visited, and
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1125 VISITED_FLAG_PHIS is the pointer to the pointer set of flag definitions
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1126 that are also phis.
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1127
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1128 Example scenario:
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1129
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1130 BB1:
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1131 flag_1 = phi <0, 1> // (1)
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1132 var_1 = phi <undef, some_val>
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1133
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1134
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1135 BB2:
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1136 flag_2 = phi <0, flag_1, flag_1> // (2)
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1137 var_2 = phi <undef, var_1, var_1>
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1138 if (flag_2 == 1)
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1139 goto BB3;
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1140
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1141 BB3:
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1142 use of var_2 // (3)
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1143
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1144 Because some flag arg in (1) is not constant, if we do not look into the
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1145 flag phis recursively, it is conservatively treated as unknown and var_1
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1146 is thought to be flowed into use at (3). Since var_1 is potentially
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1147 uninitialized a false warning will be emitted.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1148 Checking recursively into (1), the compiler can find out that only some_val
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1149 (which is defined) can flow into (3) which is OK. */
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1150
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1151 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1152 prune_uninit_phi_opnds (gphi phi, unsigned uninit_opnds, gphi flag_def,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1153 tree boundary_cst, enum tree_code cmp_code,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1154 hash_set<gphi > visited_phis,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1155 bitmap *visited_flag_phis)
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1156 {
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1157 unsigned i;
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1158
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1159 for (i = 0; i < MIN (max_phi_args, gimple_phi_num_args (flag_def)); i++)
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1160 {
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1161 tree flag_arg;
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1162
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1163 if (!MASK_TEST_BIT (uninit_opnds, i))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1164 continue;
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1165
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1166 flag_arg = gimple_phi_arg_def (flag_def, i);
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1167 if (!is_gimple_constant (flag_arg))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1168 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1169 gphi flag_arg_def, phi_arg_def;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1170 tree phi_arg;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1171 unsigned uninit_opnds_arg_phi;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1172
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1173 if (TREE_CODE (flag_arg) != SSA_NAME)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1174 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1175 flag_arg_def = dyn_cast<gphi *> (SSA_NAME_DEF_STMT (flag_arg));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1176 if (!flag_arg_def)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1177 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1178
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1179 phi_arg = gimple_phi_arg_def (phi, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1180 if (TREE_CODE (phi_arg) != SSA_NAME)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1181 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1182
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1183 phi_arg_def = dyn_cast<gphi *> (SSA_NAME_DEF_STMT (phi_arg));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1184 if (!phi_arg_def)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1185 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1186
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1187 if (gimple_bb (phi_arg_def) != gimple_bb (flag_arg_def))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1188 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1189
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1190 if (!*visited_flag_phis)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1191 *visited_flag_phis = BITMAP_ALLOC (NULL);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1192
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1193 tree phi_result = gimple_phi_result (flag_arg_def);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1194 if (bitmap_bit_p (*visited_flag_phis, SSA_NAME_VERSION (phi_result)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1195 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1196
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1197 bitmap_set_bit (*visited_flag_phis,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1198 SSA_NAME_VERSION (gimple_phi_result (flag_arg_def)));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1199
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1200 /* Now recursively prune the uninitialized phi args. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1201 uninit_opnds_arg_phi = compute_uninit_opnds_pos (phi_arg_def);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1202 if (!prune_uninit_phi_opnds
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1203 (phi_arg_def, uninit_opnds_arg_phi, flag_arg_def, boundary_cst,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1204 cmp_code, visited_phis, visited_flag_phis))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1205 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1206
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1207 phi_result = gimple_phi_result (flag_arg_def);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1208 bitmap_clear_bit (*visited_flag_phis, SSA_NAME_VERSION (phi_result));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1209 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1210 }
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1211
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1212 /* Now check if the constant is in the guarded range. */
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1213 if (is_value_included_in (flag_arg, boundary_cst, cmp_code))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1214 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1215 tree opnd;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1216 gimple *opnd_def;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1217
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1218 /* Now that we know that this undefined edge is not
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1219 pruned. If the operand is defined by another phi,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1220 we can further prune the incoming edges of that
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1221 phi by checking the predicates of this operands. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1222
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1223 opnd = gimple_phi_arg_def (phi, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1224 opnd_def = SSA_NAME_DEF_STMT (opnd);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1225 if (gphi opnd_def_phi = dyn_cast <gphi > (opnd_def))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1226 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1227 edge opnd_edge;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1228 unsigned uninit_opnds2 = compute_uninit_opnds_pos (opnd_def_phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1229 if (!MASK_EMPTY (uninit_opnds2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1230 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1231 pred_chain_union def_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1232 bool ok;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1233 opnd_edge = gimple_phi_arg_edge (phi, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1234 ok = is_use_properly_guarded (phi,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1235 opnd_edge->src,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1236 opnd_def_phi,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1237 uninit_opnds2,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1238 &def_preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1239 visited_phis);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1240 destroy_predicate_vecs (&def_preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1241 if (!ok)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1242 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1243 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1244 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1245 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1246 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1247 }
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1248 }
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1249
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1250 return true;
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1251 }
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1252
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1253 /* A helper function that determines if the predicate set
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1254 of the use is not overlapping with that of the uninit paths.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1255 The most common senario of guarded use is in Example 1:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1256 Example 1:
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1257 if (some_cond)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1258 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1259 x = ...;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1260 flag = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1261 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1262
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1263 ... some code ...
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1264
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1265 if (flag)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1266 use (x);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1267
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1268 The real world examples are usually more complicated, but similar
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1269 and usually result from inlining:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1270
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1271 bool init_func (int * x)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1272 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1273 if (some_cond)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1274 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1275 *x = ..
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1276 return true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1277 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1278
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1279 void foo (..)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1280 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1281 int x;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1282
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1283 if (!init_func (&x))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1284 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1285
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1286 .. some_code ...
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1287 use (x);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1288 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1289
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1290 Another possible use scenario is in the following trivial example:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1291
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1292 Example 2:
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1293 if (n > 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1294 x = 1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1295 ...
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1296 if (n > 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1297 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1298 if (m < 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1299 .. = x;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1300 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1301
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1302 Predicate analysis needs to compute the composite predicate:
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1303
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1304 1) 'x' use predicate: (n > 0) .AND. (m < 2)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1305 2) 'x' default value (non-def) predicate: .NOT. (n > 0)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1306 (the predicate chain for phi operand defs can be computed
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1307 starting from a bb that is control equivalent to the phi's
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1308 bb and is dominating the operand def.)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1309
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1310 and check overlapping:
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1311 (n > 0) .AND. (m < 2) .AND. (.NOT. (n > 0))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1312 <==> false
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1313
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1314 This implementation provides framework that can handle
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1315 scenarios. (Note that many simple cases are handled properly
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1316 without the predicate analysis -- this is due to jump threading
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1317 transformation which eliminates the merge point thus makes
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1318 path sensitive analysis unnecessary.)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1319
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1320 PHI is the phi node whose incoming (undefined) paths need to be
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1321 pruned, and UNINIT_OPNDS is the bitmap holding uninit operand
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1322 positions. VISITED_PHIS is the pointer set of phi stmts being
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1323 checked. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1324
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1325 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1326 use_pred_not_overlap_with_undef_path_pred (pred_chain_union preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1327 gphi *phi, unsigned uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1328 hash_set<gphi > visited_phis)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1329 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1330 unsigned int i, n;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1331 gimple *flag_def = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1332 tree boundary_cst = 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1333 enum tree_code cmp_code;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1334 bool swap_cond = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1335 bool invert = false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1336 pred_chain the_pred_chain = vNULL;
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1337 bitmap visited_flag_phis = NULL;
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1338 bool all_pruned = false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1339 size_t num_preds = preds.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1340
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1341 gcc_assert (num_preds > 0);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1342 /* Find within the common prefix of multiple predicate chains
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1343 a predicate that is a comparison of a flag variable against
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1344 a constant. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1345 the_pred_chain = preds[0];
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1346 n = the_pred_chain.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1347 for (i = 0; i < n; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1348 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1349 tree cond_lhs, cond_rhs, flag = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1350
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1351 pred_info the_pred = the_pred_chain[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1352
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1353 invert = the_pred.invert;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1354 cond_lhs = the_pred.pred_lhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1355 cond_rhs = the_pred.pred_rhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1356 cmp_code = the_pred.cond_code;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1357
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1358 if (cond_lhs != NULL_TREE && TREE_CODE (cond_lhs) == SSA_NAME
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1359 && cond_rhs != NULL_TREE && is_gimple_constant (cond_rhs))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1360 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1361 boundary_cst = cond_rhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1362 flag = cond_lhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1363 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1364 else if (cond_rhs != NULL_TREE && TREE_CODE (cond_rhs) == SSA_NAME
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1365 && cond_lhs != NULL_TREE && is_gimple_constant (cond_lhs))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1366 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1367 boundary_cst = cond_lhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1368 flag = cond_rhs;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1369 swap_cond = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1370 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1371
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1372 if (!flag)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1373 continue;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1374
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1375 flag_def = SSA_NAME_DEF_STMT (flag);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1376
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1377 if (!flag_def)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1378 continue;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1379
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1380 if ((gimple_code (flag_def) == GIMPLE_PHI)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1381 && (gimple_bb (flag_def) == gimple_bb (phi))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1382 && find_matching_predicate_in_rest_chains (the_pred, preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1383 num_preds))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1384 break;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1385
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1386 flag_def = 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1387 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1388
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1389 if (!flag_def)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1390 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1391
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1392 /* Now check all the uninit incoming edge has a constant flag value
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1393 that is in conflict with the use guard/predicate. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1394 cmp_code = get_cmp_code (cmp_code, swap_cond, invert);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1395
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1396 if (cmp_code == ERROR_MARK)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1397 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1398
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1399 all_pruned = prune_uninit_phi_opnds
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1400 (phi, uninit_opnds, as_a<gphi *> (flag_def), boundary_cst, cmp_code,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1401 visited_phis, &visited_flag_phis);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1402
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1403 if (visited_flag_phis)
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1404 BITMAP_FREE (visited_flag_phis);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1405
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	1406 return all_pruned;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1407 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1408
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1409 /* The helper function returns true if two predicates X1 and X2
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1410 are equivalent. It assumes the expressions have already
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1411 properly re-associated. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1412
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1413 static inline bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1414 pred_equal_p (pred_info x1, pred_info x2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1415 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1416 enum tree_code c1, c2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1417 if (!operand_equal_p (x1.pred_lhs, x2.pred_lhs, 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1418 \|\| !operand_equal_p (x1.pred_rhs, x2.pred_rhs, 0))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1419 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1420
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1421 c1 = x1.cond_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1422 if (x1.invert != x2.invert
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1423 && TREE_CODE_CLASS (x2.cond_code) == tcc_comparison)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1424 c2 = invert_tree_comparison (x2.cond_code, false);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1425 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1426 c2 = x2.cond_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1427
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1428 return c1 == c2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1429 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1430
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1431 /* Returns true if the predication is testing !=. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1432
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1433 static inline bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1434 is_neq_relop_p (pred_info pred)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1435 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1436
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1437 return ((pred.cond_code == NE_EXPR && !pred.invert)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1438 \|\| (pred.cond_code == EQ_EXPR && pred.invert));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1439 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1440
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1441 /* Returns true if pred is of the form X != 0. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1442
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1443 static inline bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1444 is_neq_zero_form_p (pred_info pred)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1445 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1446 if (!is_neq_relop_p (pred) \|\| !integer_zerop (pred.pred_rhs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1447 \|\| TREE_CODE (pred.pred_lhs) != SSA_NAME)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1448 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1449 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1450 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1451
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1452 /* The helper function returns true if two predicates X1
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1453 is equivalent to X2 != 0. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1454
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1455 static inline bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1456 pred_expr_equal_p (pred_info x1, tree x2)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1457 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1458 if (!is_neq_zero_form_p (x1))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1459 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1460
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1461 return operand_equal_p (x1.pred_lhs, x2, 0);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1462 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1463
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1464 /* Returns true of the domain of single predicate expression
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1465 EXPR1 is a subset of that of EXPR2. Returns false if it
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1466 cannot be proved. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1467
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1468 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1469 is_pred_expr_subset_of (pred_info expr1, pred_info expr2)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1470 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1471 enum tree_code code1, code2;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1472
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1473 if (pred_equal_p (expr1, expr2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1474 return true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1475
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1476 if ((TREE_CODE (expr1.pred_rhs) != INTEGER_CST)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1477 \|\| (TREE_CODE (expr2.pred_rhs) != INTEGER_CST))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1478 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1479
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1480 if (!operand_equal_p (expr1.pred_lhs, expr2.pred_lhs, 0))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1481 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1482
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1483 code1 = expr1.cond_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1484 if (expr1.invert)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1485 code1 = invert_tree_comparison (code1, false);
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1486 code2 = expr2.cond_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1487 if (expr2.invert)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1488 code2 = invert_tree_comparison (code2, false);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1489
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1490 if (code2 == NE_EXPR && code1 == NE_EXPR)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1491 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1492
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1493 if (code2 == NE_EXPR)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1494 return !value_sat_pred_p (expr2.pred_rhs, expr1.pred_rhs, code1);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1495
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1496 if (code1 == EQ_EXPR)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1497 return value_sat_pred_p (expr1.pred_rhs, expr2.pred_rhs, code2);
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1498
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1499 if (code1 == code2)
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1500 return value_sat_pred_p (expr1.pred_rhs, expr2.pred_rhs, code2,
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1501 code1 == BIT_AND_EXPR);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1502
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1503 return false;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1504 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1505
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1506 /* Returns true if the domain of PRED1 is a subset
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1507 of that of PRED2. Returns false if it cannot be proved so. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1508
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1509 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1510 is_pred_chain_subset_of (pred_chain pred1, pred_chain pred2)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1511 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1512 size_t np1, np2, i1, i2;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1513
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1514 np1 = pred1.length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1515 np2 = pred2.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1516
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1517 for (i2 = 0; i2 < np2; i2++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1518 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1519 bool found = false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1520 pred_info info2 = pred2[i2];
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1521 for (i1 = 0; i1 < np1; i1++)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1522 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1523 pred_info info1 = pred1[i1];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1524 if (is_pred_expr_subset_of (info1, info2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1525 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1526 found = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1527 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1528 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1529 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1530 if (!found)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1531 return false;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1532 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1533 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1534 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1535
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1536 /* Returns true if the domain defined by
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1537 one pred chain ONE_PRED is a subset of the domain
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1538 of *PREDS. It returns false if ONE_PRED's domain is
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1539 not a subset of any of the sub-domains of PREDS
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1540 (corresponding to each individual chains in it), even
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1541 though it may be still be a subset of whole domain
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1542 of PREDS which is the union (ORed) of all its subdomains.
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1543 In other words, the result is conservative. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1544
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1545 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1546 is_included_in (pred_chain one_pred, pred_chain_union preds)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1547 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1548 size_t i;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1549 size_t n = preds.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1550
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1551 for (i = 0; i < n; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1552 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1553 if (is_pred_chain_subset_of (one_pred, preds[i]))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1554 return true;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1555 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1556
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1557 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1558 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1559
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1560 /* Compares two predicate sets PREDS1 and PREDS2 and returns
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1561 true if the domain defined by PREDS1 is a superset
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1562 of PREDS2's domain. N1 and N2 are array sizes of PREDS1 and
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1563 PREDS2 respectively. The implementation chooses not to build
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1564 generic trees (and relying on the folding capability of the
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1565 compiler), but instead performs brute force comparison of
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1566 individual predicate chains (won't be a compile time problem
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1567 as the chains are pretty short). When the function returns
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1568 false, it does not necessarily mean *PREDS1 is not a superset
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1569 of *PREDS2, but mean it may not be so since the analysis cannot
1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	1570 prove it. In such cases, false warnings may still be
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1571 emitted. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1572
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1573 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1574 is_superset_of (pred_chain_union preds1, pred_chain_union preds2)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1575 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1576 size_t i, n2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1577 pred_chain one_pred_chain = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1578
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1579 n2 = preds2.length ();
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1580
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1581 for (i = 0; i < n2; i++)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1582 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1583 one_pred_chain = preds2[i];
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1584 if (!is_included_in (one_pred_chain, preds1))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1585 return false;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1586 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1587
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1588 return true;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1589 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	1590
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	1591 /* Returns true if X1 is the negate of X2. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1592
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1593 static inline bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1594 pred_neg_p (pred_info x1, pred_info x2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1595 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1596 enum tree_code c1, c2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1597 if (!operand_equal_p (x1.pred_lhs, x2.pred_lhs, 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1598 \|\| !operand_equal_p (x1.pred_rhs, x2.pred_rhs, 0))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1599 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1600
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1601 c1 = x1.cond_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1602 if (x1.invert == x2.invert)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1603 c2 = invert_tree_comparison (x2.cond_code, false);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1604 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1605 c2 = x2.cond_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1606
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1607 return c1 == c2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1608 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1609
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1610 /* 1) ((x IOR y) != 0) AND (x != 0) is equivalent to (x != 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1611 2) (X AND Y) OR (!X AND Y) is equivalent to Y;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1612 3) X OR (!X AND Y) is equivalent to (X OR Y);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1613 4) ((x IAND y) != 0) \|\| (x != 0 AND y != 0)) is equivalent to
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1614 (x != 0 AND y != 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1615 5) (X AND Y) OR (!X AND Z) OR (!Y AND Z) is equivalent to
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1616 (X AND Y) OR Z
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1617
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1618 PREDS is the predicate chains, and N is the number of chains. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1619
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1620 /* Helper function to implement rule 1 above. ONE_CHAIN is
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1621 the AND predication to be simplified. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1622
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1623 static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1624 simplify_pred (pred_chain *one_chain)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1625 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1626 size_t i, j, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1627 bool simplified = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1628 pred_chain s_chain = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1629
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1630 n = one_chain->length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1631
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1632 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1633 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1634 pred_info a_pred = &(one_chain)[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1635
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1636 if (!a_pred->pred_lhs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1637 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1638 if (!is_neq_zero_form_p (*a_pred))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1639 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1640
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1641 gimple *def_stmt = SSA_NAME_DEF_STMT (a_pred->pred_lhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1642 if (gimple_code (def_stmt) != GIMPLE_ASSIGN)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1643 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1644 if (gimple_assign_rhs_code (def_stmt) == BIT_IOR_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1645 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1646 for (j = 0; j < n; j++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1647 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1648 pred_info b_pred = &(one_chain)[j];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1649
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1650 if (!b_pred->pred_lhs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1651 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1652 if (!is_neq_zero_form_p (*b_pred))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1653 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1654
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1655 if (pred_expr_equal_p (*b_pred, gimple_assign_rhs1 (def_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1656 \|\| pred_expr_equal_p (*b_pred, gimple_assign_rhs2 (def_stmt)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1657 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1658 /* Mark a_pred for removal. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1659 a_pred->pred_lhs = NULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1660 a_pred->pred_rhs = NULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1661 simplified = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1662 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1663 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1664 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1665 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1666 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1667
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1668 if (!simplified)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1669 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1670
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1671 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1672 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1673 pred_info a_pred = &(one_chain)[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1674 if (!a_pred->pred_lhs)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1675 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1676 s_chain.safe_push (*a_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1677 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1678
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1679 one_chain->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1680 *one_chain = s_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1681 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1682
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1683 /* The helper function implements the rule 2 for the
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1684 OR predicate PREDS.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1685
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1686 2) (X AND Y) OR (!X AND Y) is equivalent to Y. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1687
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1688 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1689 simplify_preds_2 (pred_chain_union *preds)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1690 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1691 size_t i, j, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1692 bool simplified = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1693 pred_chain_union s_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1694
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1695 /* (X AND Y) OR (!X AND Y) is equivalent to Y.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1696 (X AND Y) OR (X AND !Y) is equivalent to X. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1697
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1698 n = preds->length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1699 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1700 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1701 pred_info x, y;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1702 pred_chain a_chain = &(preds)[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1703
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1704 if (a_chain->length () != 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1705 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1706
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1707 x = (*a_chain)[0];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1708 y = (*a_chain)[1];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1709
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1710 for (j = 0; j < n; j++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1711 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1712 pred_chain *b_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1713 pred_info x2, y2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1714
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1715 if (j == i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1716 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1717
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1718 b_chain = &(*preds)[j];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1719 if (b_chain->length () != 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1720 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1721
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1722 x2 = (*b_chain)[0];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1723 y2 = (*b_chain)[1];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1724
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1725 if (pred_equal_p (x, x2) && pred_neg_p (y, y2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1726 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1727 /* Kill a_chain. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1728 a_chain->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1729 b_chain->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1730 b_chain->safe_push (x);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1731 simplified = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1732 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1733 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1734 if (pred_neg_p (x, x2) && pred_equal_p (y, y2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1735 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1736 /* Kill a_chain. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1737 a_chain->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1738 b_chain->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1739 b_chain->safe_push (y);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1740 simplified = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1741 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1742 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1743 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1744 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1745 /* Now clean up the chain. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1746 if (simplified)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1747 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1748 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1749 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1750 if ((*preds)[i].is_empty ())
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1751 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1752 s_preds.safe_push ((*preds)[i]);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1753 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1754 preds->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1755 (*preds) = s_preds;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1756 s_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1757 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1758
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1759 return simplified;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1760 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1761
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1762 /* The helper function implements the rule 2 for the
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1763 OR predicate PREDS.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1764
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1765 3) x OR (!x AND y) is equivalent to x OR y. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1766
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1767 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1768 simplify_preds_3 (pred_chain_union *preds)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1769 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1770 size_t i, j, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1771 bool simplified = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1772
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1773 /* Now iteratively simplify X OR (!X AND Z ..)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1774 into X OR (Z ...). */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1775
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1776 n = preds->length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1777 if (n < 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1778 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1779
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1780 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1781 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1782 pred_info x;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1783 pred_chain a_chain = &(preds)[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1784
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1785 if (a_chain->length () != 1)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1786 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1787
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1788 x = (*a_chain)[0];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1789
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1790 for (j = 0; j < n; j++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1791 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1792 pred_chain *b_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1793 pred_info x2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1794 size_t k;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1795
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1796 if (j == i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1797 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1798
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1799 b_chain = &(*preds)[j];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1800 if (b_chain->length () < 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1801 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1802
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1803 for (k = 0; k < b_chain->length (); k++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1804 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1805 x2 = (*b_chain)[k];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1806 if (pred_neg_p (x, x2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1807 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1808 b_chain->unordered_remove (k);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1809 simplified = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1810 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1811 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1812 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1813 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1814 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1815 return simplified;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1816 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1817
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1818 /* The helper function implements the rule 4 for the
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1819 OR predicate PREDS.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1820
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1821 2) ((x AND y) != 0) OR (x != 0 AND y != 0) is equivalent to
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1822 (x != 0 ANd y != 0). */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1823
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1824 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1825 simplify_preds_4 (pred_chain_union *preds)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1826 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1827 size_t i, j, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1828 bool simplified = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1829 pred_chain_union s_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1830 gimple *def_stmt;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1831
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1832 n = preds->length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1833 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1834 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1835 pred_info z;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1836 pred_chain a_chain = &(preds)[i];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1837
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1838 if (a_chain->length () != 1)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1839 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1840
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1841 z = (*a_chain)[0];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1842
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1843 if (!is_neq_zero_form_p (z))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1844 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1845
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1846 def_stmt = SSA_NAME_DEF_STMT (z.pred_lhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1847 if (gimple_code (def_stmt) != GIMPLE_ASSIGN)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1848 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1849
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1850 if (gimple_assign_rhs_code (def_stmt) != BIT_AND_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1851 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1852
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1853 for (j = 0; j < n; j++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1854 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1855 pred_chain *b_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1856 pred_info x2, y2;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1857
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1858 if (j == i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1859 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1860
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1861 b_chain = &(*preds)[j];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1862 if (b_chain->length () != 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1863 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1864
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1865 x2 = (*b_chain)[0];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1866 y2 = (*b_chain)[1];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1867 if (!is_neq_zero_form_p (x2) \|\| !is_neq_zero_form_p (y2))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1868 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1869
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1870 if ((pred_expr_equal_p (x2, gimple_assign_rhs1 (def_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1871 && pred_expr_equal_p (y2, gimple_assign_rhs2 (def_stmt)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1872 \|\| (pred_expr_equal_p (x2, gimple_assign_rhs2 (def_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1873 && pred_expr_equal_p (y2, gimple_assign_rhs1 (def_stmt))))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1874 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1875 /* Kill a_chain. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1876 a_chain->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1877 simplified = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1878 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1879 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1880 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1881 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1882 /* Now clean up the chain. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1883 if (simplified)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1884 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1885 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1886 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1887 if ((*preds)[i].is_empty ())
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1888 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1889 s_preds.safe_push ((*preds)[i]);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1890 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1891
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1892 preds->release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1893 (*preds) = s_preds;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1894 s_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1895 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1896
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1897 return simplified;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1898 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1899
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1900 /* This function simplifies predicates in PREDS. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1901
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1902 static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1903 simplify_preds (pred_chain_union preds, gimple use_or_def, bool is_use)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1904 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1905 size_t i, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1906 bool changed = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1907
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1908 if (dump_file && dump_flags & TDF_DETAILS)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1909 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1910 fprintf (dump_file, "[BEFORE SIMPLICATION -- ");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1911 dump_predicates (use_or_def, *preds, is_use ? "[USE]:\n" : "[DEF]:\n");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1912 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1913
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1914 for (i = 0; i < preds->length (); i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1915 simplify_pred (&(*preds)[i]);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1916
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1917 n = preds->length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1918 if (n < 2)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1919 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1920
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1921 do
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1922 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1923 changed = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1924 if (simplify_preds_2 (preds))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1925 changed = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1926
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1927 /* Now iteratively simplify X OR (!X AND Z ..)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1928 into X OR (Z ...). */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1929 if (simplify_preds_3 (preds))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1930 changed = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1931
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1932 if (simplify_preds_4 (preds))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1933 changed = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1934 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1935 while (changed);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1936
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1937 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1938 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1939
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1940 /* This is a helper function which attempts to normalize predicate chains
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1941 by following UD chains. It basically builds up a big tree of either IOR
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1942 operations or AND operations, and convert the IOR tree into a
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1943 pred_chain_union or BIT_AND tree into a pred_chain.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1944 Example:
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1945
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1946 _3 = _2 RELOP1 _1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1947 _6 = _5 RELOP2 _4;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1948 _9 = _8 RELOP3 _7;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1949 _10 = _3 \| _6;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1950 _12 = _9 \| _0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1951 _t = _10 \| _12;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1952
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1953 then _t != 0 will be normalized into a pred_chain_union
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1954
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1955 (_2 RELOP1 _1) OR (_5 RELOP2 _4) OR (_8 RELOP3 _7) OR (_0 != 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1956
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1957 Similarly given,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1958
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1959 _3 = _2 RELOP1 _1;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1960 _6 = _5 RELOP2 _4;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1961 _9 = _8 RELOP3 _7;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1962 _10 = _3 & _6;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1963 _12 = _9 & _0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1964
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1965 then _t != 0 will be normalized into a pred_chain:
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1966 (_2 RELOP1 _1) AND (_5 RELOP2 _4) AND (_8 RELOP3 _7) AND (_0 != 0)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1967
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1968 */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1969
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1970 /* This is a helper function that stores a PRED into NORM_PREDS. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1971
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1972 inline static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1973 push_pred (pred_chain_union *norm_preds, pred_info pred)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1974 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1975 pred_chain pred_chain = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1976 pred_chain.safe_push (pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1977 norm_preds->safe_push (pred_chain);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1978 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1979
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1980 /* A helper function that creates a predicate of the form
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1981 OP != 0 and push it WORK_LIST. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1982
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1983 inline static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1984 push_to_worklist (tree op, vec<pred_info, va_heap, vl_ptr> *work_list,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1985 hash_set<tree> *mark_set)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1986 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1987 if (mark_set->contains (op))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1988 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1989 mark_set->add (op);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1990
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1991 pred_info arg_pred;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1992 arg_pred.pred_lhs = op;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1993 arg_pred.pred_rhs = integer_zero_node;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1994 arg_pred.cond_code = NE_EXPR;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1995 arg_pred.invert = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1996 work_list->safe_push (arg_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1997 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1998
04ced10e8804 gcc 7 kono parents: 67 diff changeset	1999 /* A helper that generates a pred_info from a gimple assignment
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2000 CMP_ASSIGN with comparison rhs. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2001
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2002 static pred_info
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2003 get_pred_info_from_cmp (gimple *cmp_assign)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2004 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2005 pred_info n_pred;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2006 n_pred.pred_lhs = gimple_assign_rhs1 (cmp_assign);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2007 n_pred.pred_rhs = gimple_assign_rhs2 (cmp_assign);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2008 n_pred.cond_code = gimple_assign_rhs_code (cmp_assign);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2009 n_pred.invert = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2010 return n_pred;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2011 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2012
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2013 /* Returns true if the PHI is a degenerated phi with
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2014 all args with the same value (relop). In that case, *PRED
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2015 will be updated to that value. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2016
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2017 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2018 is_degenerated_phi (gimple phi, pred_info pred_p)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2019 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2020 int i, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2021 tree op0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2022 gimple *def0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2023 pred_info pred0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2024
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2025 n = gimple_phi_num_args (phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2026 op0 = gimple_phi_arg_def (phi, 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2027
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2028 if (TREE_CODE (op0) != SSA_NAME)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2029 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2030
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2031 def0 = SSA_NAME_DEF_STMT (op0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2032 if (gimple_code (def0) != GIMPLE_ASSIGN)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2033 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2034 if (TREE_CODE_CLASS (gimple_assign_rhs_code (def0)) != tcc_comparison)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2035 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2036 pred0 = get_pred_info_from_cmp (def0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2037
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2038 for (i = 1; i < n; ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2039 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2040 gimple *def;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2041 pred_info pred;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2042 tree op = gimple_phi_arg_def (phi, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2043
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2044 if (TREE_CODE (op) != SSA_NAME)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2045 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2046
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2047 def = SSA_NAME_DEF_STMT (op);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2048 if (gimple_code (def) != GIMPLE_ASSIGN)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2049 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2050 if (TREE_CODE_CLASS (gimple_assign_rhs_code (def)) != tcc_comparison)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2051 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2052 pred = get_pred_info_from_cmp (def);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2053 if (!pred_equal_p (pred, pred0))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2054 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2055 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2056
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2057 *pred_p = pred0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2058 return true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2059 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2060
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2061 /* Normalize one predicate PRED
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2062 1) if PRED can no longer be normlized, put it into NORM_PREDS.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2063 2) otherwise if PRED is of the form x != 0, follow x's definition
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2064 and put normalized predicates into WORK_LIST. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2065
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2066 static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2067 normalize_one_pred_1 (pred_chain_union *norm_preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2068 pred_chain *norm_chain,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2069 pred_info pred,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2070 enum tree_code and_or_code,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2071 vec<pred_info, va_heap, vl_ptr> *work_list,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2072 hash_set<tree> *mark_set)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2073 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2074 if (!is_neq_zero_form_p (pred))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2075 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2076 if (and_or_code == BIT_IOR_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2077 push_pred (norm_preds, pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2078 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2079 norm_chain->safe_push (pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2080 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2081 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2082
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2083 gimple *def_stmt = SSA_NAME_DEF_STMT (pred.pred_lhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2084
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2085 if (gimple_code (def_stmt) == GIMPLE_PHI
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2086 && is_degenerated_phi (def_stmt, &pred))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2087 work_list->safe_push (pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2088 else if (gimple_code (def_stmt) == GIMPLE_PHI && and_or_code == BIT_IOR_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2089 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2090 int i, n;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2091 n = gimple_phi_num_args (def_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2092
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2093 /* If we see non zero constant, we should punt. The predicate
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2094 * should be one guarding the phi edge. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2095 for (i = 0; i < n; ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2096 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2097 tree op = gimple_phi_arg_def (def_stmt, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2098 if (TREE_CODE (op) == INTEGER_CST && !integer_zerop (op))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2099 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2100 push_pred (norm_preds, pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2101 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2102 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2103 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2104
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2105 for (i = 0; i < n; ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2106 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2107 tree op = gimple_phi_arg_def (def_stmt, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2108 if (integer_zerop (op))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2109 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2110
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2111 push_to_worklist (op, work_list, mark_set);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2112 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2113 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2114 else if (gimple_code (def_stmt) != GIMPLE_ASSIGN)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2115 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2116 if (and_or_code == BIT_IOR_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2117 push_pred (norm_preds, pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2118 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2119 norm_chain->safe_push (pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2120 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2121 else if (gimple_assign_rhs_code (def_stmt) == and_or_code)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2122 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2123 /* Avoid splitting up bit manipulations like x & 3 or y \| 1. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2124 if (is_gimple_min_invariant (gimple_assign_rhs2 (def_stmt)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2125 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2126 /* But treat x & 3 as condition. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2127 if (and_or_code == BIT_AND_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2128 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2129 pred_info n_pred;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2130 n_pred.pred_lhs = gimple_assign_rhs1 (def_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2131 n_pred.pred_rhs = gimple_assign_rhs2 (def_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2132 n_pred.cond_code = and_or_code;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2133 n_pred.invert = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2134 norm_chain->safe_push (n_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2135 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2136 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2137 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2138 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2139 push_to_worklist (gimple_assign_rhs1 (def_stmt), work_list, mark_set);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2140 push_to_worklist (gimple_assign_rhs2 (def_stmt), work_list, mark_set);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2141 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2142 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2143 else if (TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2144 == tcc_comparison)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2145 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2146 pred_info n_pred = get_pred_info_from_cmp (def_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2147 if (and_or_code == BIT_IOR_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2148 push_pred (norm_preds, n_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2149 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2150 norm_chain->safe_push (n_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2151 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2152 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2153 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2154 if (and_or_code == BIT_IOR_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2155 push_pred (norm_preds, pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2156 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2157 norm_chain->safe_push (pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2158 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2159 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2160
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2161 /* Normalize PRED and store the normalized predicates into NORM_PREDS. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2162
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2163 static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2164 normalize_one_pred (pred_chain_union *norm_preds, pred_info pred)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2165 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2166 vec<pred_info, va_heap, vl_ptr> work_list = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2167 enum tree_code and_or_code = ERROR_MARK;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2168 pred_chain norm_chain = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2169
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2170 if (!is_neq_zero_form_p (pred))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2171 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2172 push_pred (norm_preds, pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2173 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2174 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2175
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2176 gimple *def_stmt = SSA_NAME_DEF_STMT (pred.pred_lhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2177 if (gimple_code (def_stmt) == GIMPLE_ASSIGN)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2178 and_or_code = gimple_assign_rhs_code (def_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2179 if (and_or_code != BIT_IOR_EXPR && and_or_code != BIT_AND_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2180 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2181 if (TREE_CODE_CLASS (and_or_code) == tcc_comparison)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2182 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2183 pred_info n_pred = get_pred_info_from_cmp (def_stmt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2184 push_pred (norm_preds, n_pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2185 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2186 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2187 push_pred (norm_preds, pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2188 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2189 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2190
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2191 work_list.safe_push (pred);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2192 hash_set<tree> mark_set;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2193
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2194 while (!work_list.is_empty ())
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2195 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2196 pred_info a_pred = work_list.pop ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2197 normalize_one_pred_1 (norm_preds, &norm_chain, a_pred, and_or_code,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2198 &work_list, &mark_set);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2199 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2200 if (and_or_code == BIT_AND_EXPR)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2201 norm_preds->safe_push (norm_chain);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2202
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2203 work_list.release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2204 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2205
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2206 static void
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2207 normalize_one_pred_chain (pred_chain_union *norm_preds, pred_chain one_chain)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2208 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2209 vec<pred_info, va_heap, vl_ptr> work_list = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2210 hash_set<tree> mark_set;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2211 pred_chain norm_chain = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2212 size_t i;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2213
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2214 for (i = 0; i < one_chain.length (); i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2215 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2216 work_list.safe_push (one_chain[i]);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2217 mark_set.add (one_chain[i].pred_lhs);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2218 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2219
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2220 while (!work_list.is_empty ())
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2221 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2222 pred_info a_pred = work_list.pop ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2223 normalize_one_pred_1 (0, &norm_chain, a_pred, BIT_AND_EXPR, &work_list,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2224 &mark_set);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2225 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2226
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2227 norm_preds->safe_push (norm_chain);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2228 work_list.release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2229 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2230
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2231 /* Normalize predicate chains PREDS and returns the normalized one. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2232
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2233 static pred_chain_union
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2234 normalize_preds (pred_chain_union preds, gimple *use_or_def, bool is_use)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2235 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2236 pred_chain_union norm_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2237 size_t n = preds.length ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2238 size_t i;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2239
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2240 if (dump_file && dump_flags & TDF_DETAILS)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2241 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2242 fprintf (dump_file, "[BEFORE NORMALIZATION --");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2243 dump_predicates (use_or_def, preds, is_use ? "[USE]:\n" : "[DEF]:\n");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2244 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2245
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2246 for (i = 0; i < n; i++)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2247 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2248 if (preds[i].length () != 1)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2249 normalize_one_pred_chain (&norm_preds, preds[i]);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2250 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2251 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2252 normalize_one_pred (&norm_preds, preds[i][0]);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2253 preds[i].release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2254 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2255 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2256
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2257 if (dump_file)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2258 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2259 fprintf (dump_file, "[AFTER NORMALIZATION -- ");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2260 dump_predicates (use_or_def, norm_preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2261 is_use ? "[USE]:\n" : "[DEF]:\n");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2262 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2263
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2264 destroy_predicate_vecs (&preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2265 return norm_preds;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2266 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2267
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2268 /* Return TRUE if PREDICATE can be invalidated by any individual
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2269 predicate in USE_GUARD. */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2270
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2271 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2272 can_one_predicate_be_invalidated_p (pred_info predicate,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2273 pred_chain use_guard)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2274 {
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2275 if (dump_file && dump_flags & TDF_DETAILS)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2276 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2277 fprintf (dump_file, "Testing if this predicate: ");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2278 dump_pred_info (predicate);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2279 fprintf (dump_file, "\n...can be invalidated by a USE guard of: ");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2280 dump_pred_chain (use_guard);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2281 }
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2282 for (size_t i = 0; i < use_guard.length (); ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2283 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2284 /* NOTE: This is a very simple check, and only understands an
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2285 exact opposite. So, [i == 0] is currently only invalidated
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2286 by [.NOT. i == 0] or [i != 0]. Ideally we should also
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2287 invalidate with say [i > 5] or [i == 8]. There is certainly
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2288 room for improvement here. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2289 if (pred_neg_p (predicate, use_guard[i]))
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2290 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2291 if (dump_file && dump_flags & TDF_DETAILS)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2292 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2293 fprintf (dump_file, " Predicate was invalidated by: ");
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2294 dump_pred_info (use_guard[i]);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2295 fputc ('\n', dump_file);
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2296 }
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2297 return true;
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2298 }
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2299 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2300 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2301 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2302
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2303 /* Return TRUE if all predicates in UNINIT_PRED are invalidated by
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2304 USE_GUARD being true. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2305
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2306 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2307 can_chain_union_be_invalidated_p (pred_chain_union uninit_pred,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2308 pred_chain use_guard)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2309 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2310 if (uninit_pred.is_empty ())
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2311 return false;
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2312 if (dump_file && dump_flags & TDF_DETAILS)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2313 dump_predicates (NULL, uninit_pred,
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2314 "Testing if anything here can be invalidated: ");
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2315 for (size_t i = 0; i < uninit_pred.length (); ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2316 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2317 pred_chain c = uninit_pred[i];
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2318 size_t j;
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2319 for (j = 0; j < c.length (); ++j)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2320 if (can_one_predicate_be_invalidated_p (c[j], use_guard))
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2321 break;
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2322
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2323 /* If we were unable to invalidate any predicate in C, then there
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2324 is a viable path from entry to the PHI where the PHI takes
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2325 an uninitialized value and continues to a use of the PHI. */
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2326 if (j == c.length ())
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2327 return false;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2328 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2329 return true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2330 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2331
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2332 /* Return TRUE if none of the uninitialized operands in UNINT_OPNDS
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2333 can actually happen if we arrived at a use for PHI.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2334
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2335 PHI_USE_GUARDS are the guard conditions for the use of the PHI. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2336
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2337 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2338 uninit_uses_cannot_happen (gphi *phi, unsigned uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2339 pred_chain_union phi_use_guards)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2340 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2341 unsigned phi_args = gimple_phi_num_args (phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2342 if (phi_args > max_phi_args)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2343 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2344
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2345 /* PHI_USE_GUARDS are OR'ed together. If we have more than one
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2346 possible guard, there's no way of knowing which guard was true.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2347 Since we need to be absolutely sure that the uninitialized
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2348 operands will be invalidated, bail. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2349 if (phi_use_guards.length () != 1)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2350 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2351
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2352 /* Look for the control dependencies of all the uninitialized
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2353 operands and build guard predicates describing them. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2354 pred_chain_union uninit_preds;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2355 bool ret = true;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2356 for (unsigned i = 0; i < phi_args; ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2357 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2358 if (!MASK_TEST_BIT (uninit_opnds, i))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2359 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2360
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2361 edge e = gimple_phi_arg_edge (phi, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2362 vec<edge> dep_chains[MAX_NUM_CHAINS];
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2363 auto_vec<edge, MAX_CHAIN_LEN + 1> cur_chain;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2364 size_t num_chains = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2365 int num_calls = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2366
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2367 /* Build the control dependency chain for uninit operand `i'... */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2368 uninit_preds = vNULL;
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2369 if (!compute_control_dep_chain (ENTRY_BLOCK_PTR_FOR_FN (cfun),
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2370 e->src, dep_chains, &num_chains,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2371 &cur_chain, &num_calls))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2372 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2373 ret = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2374 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2375 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2376 /* ...and convert it into a set of predicates. */
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2377 bool has_valid_preds
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2378 = convert_control_dep_chain_into_preds (dep_chains, num_chains,
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2379 &uninit_preds);
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2380 for (size_t j = 0; j < num_chains; ++j)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2381 dep_chains[j].release ();
131 84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2382 if (!has_valid_preds)
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2383 {
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2384 ret = false;
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2385 break;
84e7813d76e9 gcc-8.2 mir3636 parents: 111 diff changeset	2386 }
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2387 simplify_preds (&uninit_preds, NULL, false);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2388 uninit_preds = normalize_preds (uninit_preds, NULL, false);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2389
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2390 /* Can the guard for this uninitialized operand be invalidated
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2391 by the PHI use? */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2392 if (!can_chain_union_be_invalidated_p (uninit_preds, phi_use_guards[0]))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2393 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2394 ret = false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2395 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2396 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2397 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2398 destroy_predicate_vecs (&uninit_preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2399 return ret;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2400 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2401
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2402 /* Computes the predicates that guard the use and checks
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2403 if the incoming paths that have empty (or possibly
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2404 empty) definition can be pruned/filtered. The function returns
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2405 true if it can be determined that the use of PHI's def in
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2406 USE_STMT is guarded with a predicate set not overlapping with
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2407 predicate sets of all runtime paths that do not have a definition.
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2408
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	2409 Returns false if it is not or it cannot be determined. USE_BB is
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2410 the bb of the use (for phi operand use, the bb is not the bb of
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2411 the phi stmt, but the src bb of the operand edge).
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2412
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2413 UNINIT_OPNDS is a bit vector. If an operand of PHI is uninitialized, the
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2414 corresponding bit in the vector is 1. VISITED_PHIS is a pointer
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2415 set of phis being visited.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2416
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2417 *DEF_PREDS contains the (memoized) defining predicate chains of PHI.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2418 If *DEF_PREDS is the empty vector, the defining predicate chains of
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2419 PHI will be computed and stored into *DEF_PREDS as needed.
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2420
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2421 VISITED_PHIS is a pointer set of phis being visited. */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2422
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2423 static bool
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2424 is_use_properly_guarded (gimple *use_stmt,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2425 basic_block use_bb,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2426 gphi *phi,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2427 unsigned uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2428 pred_chain_union *def_preds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2429 hash_set<gphi > visited_phis)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2430 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2431 basic_block phi_bb;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2432 pred_chain_union preds = vNULL;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2433 bool has_valid_preds = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2434 bool is_properly_guarded = false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2435
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2436 if (visited_phis->add (phi))
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2437 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2438
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2439 phi_bb = gimple_bb (phi);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2440
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2441 if (is_non_loop_exit_postdominating (use_bb, phi_bb))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2442 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2443
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2444 has_valid_preds = find_predicates (&preds, phi_bb, use_bb);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2445
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2446 if (!has_valid_preds)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2447 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2448 destroy_predicate_vecs (&preds);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2449 return false;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2450 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2451
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2452 /* Try to prune the dead incoming phi edges. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2453 is_properly_guarded
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2454 = use_pred_not_overlap_with_undef_path_pred (preds, phi, uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2455 visited_phis);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2456
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2457 /* We might be able to prove that if the control dependencies
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2458 for UNINIT_OPNDS are true, that the control dependencies for
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2459 USE_STMT can never be true. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2460 if (!is_properly_guarded)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2461 is_properly_guarded \|= uninit_uses_cannot_happen (phi, uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2462 preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2463
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2464 if (is_properly_guarded)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2465 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2466 destroy_predicate_vecs (&preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2467 return true;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2468 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2469
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2470 if (def_preds->is_empty ())
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2471 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2472 has_valid_preds = find_def_preds (def_preds, phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2473
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2474 if (!has_valid_preds)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2475 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2476 destroy_predicate_vecs (&preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2477 return false;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2478 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2479
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2480 simplify_preds (def_preds, phi, false);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2481 def_preds = normalize_preds (def_preds, phi, false);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2482 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2483
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2484 simplify_preds (&preds, use_stmt, true);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2485 preds = normalize_preds (preds, use_stmt, true);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2486
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2487 is_properly_guarded = is_superset_of (*def_preds, preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2488
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2489 destroy_predicate_vecs (&preds);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2490 return is_properly_guarded;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2491 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2492
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2493 /* Searches through all uses of a potentially
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2494 uninitialized variable defined by PHI and returns a use
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2495 statement if the use is not properly guarded. It returns
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2496 NULL if all uses are guarded. UNINIT_OPNDS is a bitvector
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2497 holding the position(s) of uninit PHI operands. WORKLIST
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2498 is the vector of candidate phis that may be updated by this
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2499 function. ADDED_TO_WORKLIST is the pointer set tracking
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2500 if the new phi is already in the worklist. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2501
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2502 static gimple *
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2503 find_uninit_use (gphi *phi, unsigned uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2504 vec<gphi > worklist,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2505 hash_set<gphi > added_to_worklist)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2506 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2507 tree phi_result;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2508 use_operand_p use_p;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2509 gimple *use_stmt;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2510 imm_use_iterator iter;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2511 pred_chain_union def_preds = vNULL;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2512 gimple *ret = NULL;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2513
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2514 phi_result = gimple_phi_result (phi);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2515
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2516 FOR_EACH_IMM_USE_FAST (use_p, iter, phi_result)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2517 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2518 basic_block use_bb;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2519
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2520 use_stmt = USE_STMT (use_p);
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2521 if (is_gimple_debug (use_stmt))
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2522 continue;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2523
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2524 if (gphi use_phi = dyn_cast<gphi > (use_stmt))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2525 use_bb = gimple_phi_arg_edge (use_phi,
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2526 PHI_ARG_INDEX_FROM_USE (use_p))->src;
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2527 else
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2528 use_bb = gimple_bb (use_stmt);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2529
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2530 hash_set<gphi *> visited_phis;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2531 if (is_use_properly_guarded (use_stmt, use_bb, phi, uninit_opnds,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2532 &def_preds, &visited_phis))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2533 continue;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2534
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2535 if (dump_file && (dump_flags & TDF_DETAILS))
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2536 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2537 fprintf (dump_file, "[CHECK]: Found unguarded use: ");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2538 print_gimple_stmt (dump_file, use_stmt, 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2539 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2540 /* Found one real use, return. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2541 if (gimple_code (use_stmt) != GIMPLE_PHI)
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2542 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2543 ret = use_stmt;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2544 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2545 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2546
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2547 /* Found a phi use that is not guarded,
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2548 add the phi to the worklist. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2549 if (!added_to_worklist->add (as_a<gphi *> (use_stmt)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2550 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2551 if (dump_file && (dump_flags & TDF_DETAILS))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2552 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2553 fprintf (dump_file, "[WORKLIST]: Update worklist with phi: ");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2554 print_gimple_stmt (dump_file, use_stmt, 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2555 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2556
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2557 worklist->safe_push (as_a<gphi *> (use_stmt));
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2558 possibly_undefined_names->add (phi_result);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2559 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2560 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2561
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2562 destroy_predicate_vecs (&def_preds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2563 return ret;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2564 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2565
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2566 /* Look for inputs to PHI that are SSA_NAMEs that have empty definitions
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2567 and gives warning if there exists a runtime path from the entry to a
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2568 use of the PHI def that does not contain a definition. In other words,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2569 the warning is on the real use. The more dead paths that can be pruned
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2570 by the compiler, the fewer false positives the warning is. WORKLIST
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2571 is a vector of candidate phis to be examined. ADDED_TO_WORKLIST is
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2572 a pointer set tracking if the new phi is added to the worklist or not. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2573
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2574 static void
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2575 warn_uninitialized_phi (gphi phi, vec<gphi > *worklist,
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2576 hash_set<gphi > added_to_worklist)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2577 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2578 unsigned uninit_opnds;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2579 gimple *uninit_use_stmt = 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2580 tree uninit_op;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2581 int phiarg_index;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2582 location_t loc;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2583
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2584 /* Don't look at virtual operands. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2585 if (virtual_operand_p (gimple_phi_result (phi)))
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2586 return;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2587
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2588 uninit_opnds = compute_uninit_opnds_pos (phi);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2589
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2590 if (MASK_EMPTY (uninit_opnds))
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2591 return;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2592
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2593 if (dump_file && (dump_flags & TDF_DETAILS))
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2594 {
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2595 fprintf (dump_file, "[CHECK]: examining phi: ");
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2596 print_gimple_stmt (dump_file, phi, 0);
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2597 }
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2598
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2599 /* Now check if we have any use of the value without proper guard. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2600 uninit_use_stmt = find_uninit_use (phi, uninit_opnds,
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2601 worklist, added_to_worklist);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2602
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2603 /* All uses are properly guarded. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2604 if (!uninit_use_stmt)
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2605 return;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2606
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2607 phiarg_index = MASK_FIRST_SET_BIT (uninit_opnds);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2608 uninit_op = gimple_phi_arg_def (phi, phiarg_index);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2609 if (SSA_NAME_VAR (uninit_op) == NULL_TREE)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2610 return;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2611 if (gimple_phi_arg_has_location (phi, phiarg_index))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2612 loc = gimple_phi_arg_location (phi, phiarg_index);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2613 else
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2614 loc = UNKNOWN_LOCATION;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2615 warn_uninit (OPT_Wmaybe_uninitialized, uninit_op, SSA_NAME_VAR (uninit_op),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2616 SSA_NAME_VAR (uninit_op),
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2617 "%qD may be used uninitialized in this function",
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2618 uninit_use_stmt, loc);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2619 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2620
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2621 static bool
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2622 gate_warn_uninitialized (void)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2623 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2624 return warn_uninitialized \|\| warn_maybe_uninitialized;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2625 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2626
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2627 namespace {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2628
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2629 const pass_data pass_data_late_warn_uninitialized =
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2630 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2631 GIMPLE_PASS, /* type */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2632 "uninit", /* name */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2633 OPTGROUP_NONE, /* optinfo_flags */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2634 TV_NONE, /* tv_id */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2635 PROP_ssa, /* properties_required */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2636 0, /* properties_provided */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2637 0, /* properties_destroyed */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2638 0, /* todo_flags_start */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2639 0, /* todo_flags_finish */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2640 };
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2641
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2642 class pass_late_warn_uninitialized : public gimple_opt_pass
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2643 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2644 public:
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2645 pass_late_warn_uninitialized (gcc::context *ctxt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2646 : gimple_opt_pass (pass_data_late_warn_uninitialized, ctxt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2647 {}
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2648
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2649 /* opt_pass methods: */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2650 opt_pass *clone () { return new pass_late_warn_uninitialized (m_ctxt); }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2651 virtual bool gate (function *) { return gate_warn_uninitialized (); }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2652 virtual unsigned int execute (function *);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2653
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2654 }; // class pass_late_warn_uninitialized
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2655
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2656 unsigned int
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2657 pass_late_warn_uninitialized::execute (function *fun)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2658 {
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2659 basic_block bb;
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2660 gphi_iterator gsi;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2661 vec<gphi *> worklist = vNULL;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2662
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2663 calculate_dominance_info (CDI_DOMINATORS);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2664 calculate_dominance_info (CDI_POST_DOMINATORS);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2665 /* Re-do the plain uninitialized variable check, as optimization may have
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2666 straightened control flow. Do this first so that we don't accidentally
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2667 get a "may be" warning when we'd have seen an "is" warning later. */
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2668 warn_uninitialized_vars (/warn_possibly_uninitialized=/1);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2669
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2670 timevar_push (TV_TREE_UNINIT);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2671
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2672 possibly_undefined_names = new hash_set<tree>;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2673 hash_set<gphi *> added_to_worklist;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2674
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2675 /* Initialize worklist */
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2676 FOR_EACH_BB_FN (bb, fun)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2677 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2678 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2679 gphi *phi = gsi.phi ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2680 size_t n, i;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2681
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2682 n = gimple_phi_num_args (phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2683
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2684 /* Don't look at virtual operands. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2685 if (virtual_operand_p (gimple_phi_result (phi)))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2686 continue;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2687
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2688 for (i = 0; i < n; ++i)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2689 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2690 tree op = gimple_phi_arg_def (phi, i);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2691 if (TREE_CODE (op) == SSA_NAME && uninit_undefined_value_p (op))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2692 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2693 worklist.safe_push (phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2694 added_to_worklist.add (phi);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2695 if (dump_file && (dump_flags & TDF_DETAILS))
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2696 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2697 fprintf (dump_file, "[WORKLIST]: add to initial list: ");
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2698 print_gimple_stmt (dump_file, phi, 0);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2699 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2700 break;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2701 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2702 }
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2703 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2704
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2705 while (worklist.length () != 0)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2706 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2707 gphi *cur_phi = 0;
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2708 cur_phi = worklist.pop ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2709 warn_uninitialized_phi (cur_phi, &worklist, &added_to_worklist);
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2710 }
67 f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318 nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 63 diff changeset	2711
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2712 worklist.release ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2713 delete possibly_undefined_names;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2714 possibly_undefined_names = NULL;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2715 free_dominance_info (CDI_POST_DOMINATORS);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2716 timevar_pop (TV_TREE_UNINIT);
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2717 return 0;
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2718 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2719
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2720 } // anon namespace
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2721
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2722 gimple_opt_pass *
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2723 make_pass_late_warn_uninitialized (gcc::context *ctxt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2724 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2725 return new pass_late_warn_uninitialized (ctxt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2726 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2727
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2728 static unsigned int
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2729 execute_early_warn_uninitialized (void)
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2730 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2731 /* Currently, this pass runs always but
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2732 execute_late_warn_uninitialized only runs with optimization. With
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2733 optimization we want to warn about possible uninitialized as late
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2734 as possible, thus don't do it here. However, without
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2735 optimization we need to warn here about "may be uninitialized". */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2736 calculate_dominance_info (CDI_POST_DOMINATORS);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2737
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2738 warn_uninitialized_vars (/warn_possibly_uninitialized=/!optimize);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2739
145 1830386684a0 gcc-9.2.0 anatofuz parents: 131 diff changeset	2740 /* Post-dominator information cannot be reliably updated. Free it
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2741 after the use. */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2742
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2743 free_dominance_info (CDI_POST_DOMINATORS);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2744 return 0;
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2745 }
b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2746
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2747 namespace {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2748
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2749 const pass_data pass_data_early_warn_uninitialized =
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2750 {
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2751 GIMPLE_PASS, /* type */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2752 "early_warn_uninitialized", / name */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2753 OPTGROUP_NONE, /* optinfo_flags */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2754 TV_TREE_UNINIT, /* tv_id */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2755 PROP_ssa, /* properties_required */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2756 0, /* properties_provided */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2757 0, /* properties_destroyed */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2758 0, /* todo_flags_start */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2759 0, /* todo_flags_finish */
63 b7f97abdc517 update gcc from gcc-4.5.0 to gcc-4.6 ryoma <e075725@ie.u-ryukyu.ac.jp> parents: diff changeset	2760 };
111 04ced10e8804 gcc 7 kono parents: 67 diff changeset	2761
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2762 class pass_early_warn_uninitialized : public gimple_opt_pass
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2763 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2764 public:
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2765 pass_early_warn_uninitialized (gcc::context *ctxt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2766 : gimple_opt_pass (pass_data_early_warn_uninitialized, ctxt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2767 {}
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2768
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2769 /* opt_pass methods: */
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2770 virtual bool gate (function *) { return gate_warn_uninitialized (); }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2771 virtual unsigned int execute (function *)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2772 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2773 return execute_early_warn_uninitialized ();
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2774 }
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2775
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2776 }; // class pass_early_warn_uninitialized
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2777
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2778 } // anon namespace
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2779
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2780 gimple_opt_pass *
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2781 make_pass_early_warn_uninitialized (gcc::context *ctxt)
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2782 {
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2783 return new pass_early_warn_uninitialized (ctxt);
04ced10e8804 gcc 7 kono parents: 67 diff changeset	2784 }

Mercurial > hg > CbC > CbC_gcc

annotate gcc/tree-ssa-uninit.c @ 158:494b0b89df80 default tip