Mercurial > hg > CbC > CbC_gcc
comparison gcc/gimple-laddress.c @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 /* Lower and optimize address expressions. | |
2 Copyright (C) 2015-2017 Free Software Foundation, Inc. | |
3 Contributed by Marek Polacek <polacek@redhat.com> | |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #include "config.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
24 #include "alias.h" | |
25 #include "predict.h" | |
26 #include "tm.h" | |
27 #include "function.h" | |
28 #include "dominance.h" | |
29 #include "cfg.h" | |
30 #include "basic-block.h" | |
31 #include "tree-ssa-alias.h" | |
32 #include "symtab.h" | |
33 #include "tree.h" | |
34 #include "stringpool.h" | |
35 #include "tree-vrp.h" | |
36 #include "tree-ssanames.h" | |
37 #include "fold-const.h" | |
38 #include "gimple-expr.h" | |
39 #include "gimple.h" | |
40 #include "gimplify.h" | |
41 #include "gimple-iterator.h" | |
42 #include "gimplify-me.h" | |
43 #include "tree-pass.h" | |
44 | |
45 | |
46 namespace { | |
47 | |
48 const pass_data pass_data_laddress = | |
49 { | |
50 GIMPLE_PASS, /* type */ | |
51 "laddress", /* name */ | |
52 OPTGROUP_NONE, /* optinfo_flags */ | |
53 TV_GIMPLE_LADDRESS, /* tv_id */ | |
54 ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
55 0, /* properties_provided */ | |
56 0, /* properties_destroyed */ | |
57 0, /* todo_flags_start */ | |
58 0, /* todo_flags_finish */ | |
59 }; | |
60 | |
61 class pass_laddress : public gimple_opt_pass | |
62 { | |
63 public: | |
64 pass_laddress (gcc::context *ctxt) | |
65 : gimple_opt_pass (pass_data_laddress, ctxt) | |
66 {} | |
67 | |
68 /* opt_pass methods: */ | |
69 opt_pass * clone () { return new pass_laddress (m_ctxt); } | |
70 virtual bool gate (function *) { return optimize != 0; } | |
71 virtual unsigned int execute (function *); | |
72 | |
73 }; // class pass_laddress | |
74 | |
75 unsigned int | |
76 pass_laddress::execute (function *fun) | |
77 { | |
78 basic_block bb; | |
79 | |
80 FOR_EACH_BB_FN (bb, fun) | |
81 { | |
82 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);) | |
83 { | |
84 gimple *stmt = gsi_stmt (gsi); | |
85 if (!is_gimple_assign (stmt) | |
86 || gimple_assign_rhs_code (stmt) != ADDR_EXPR | |
87 || is_gimple_invariant_address (gimple_assign_rhs1 (stmt))) | |
88 { | |
89 gsi_next (&gsi); | |
90 continue; | |
91 } | |
92 | |
93 /* Lower ADDR_EXPR assignments: | |
94 _4 = &b[i_9]; | |
95 into | |
96 _1 = (sizetype) i_9; | |
97 _7 = _1 * 4; | |
98 _4 = &b + _7; | |
99 This ought to aid the vectorizer and expose CSE opportunities. | |
100 */ | |
101 | |
102 tree expr = gimple_assign_rhs1 (stmt); | |
103 HOST_WIDE_INT bitsize, bitpos; | |
104 tree base, offset; | |
105 machine_mode mode; | |
106 int volatilep = 0, reversep, unsignedp = 0; | |
107 base = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize, | |
108 &bitpos, &offset, &mode, &unsignedp, | |
109 &reversep, &volatilep); | |
110 gcc_assert (base != NULL_TREE && (bitpos % BITS_PER_UNIT) == 0); | |
111 if (offset != NULL_TREE) | |
112 { | |
113 if (bitpos != 0) | |
114 offset = size_binop (PLUS_EXPR, offset, | |
115 size_int (bitpos / BITS_PER_UNIT)); | |
116 offset = force_gimple_operand_gsi (&gsi, offset, true, NULL, | |
117 true, GSI_SAME_STMT); | |
118 base = build_fold_addr_expr (base); | |
119 base = force_gimple_operand_gsi (&gsi, base, true, NULL, | |
120 true, GSI_SAME_STMT); | |
121 gimple *g = gimple_build_assign (gimple_assign_lhs (stmt), | |
122 POINTER_PLUS_EXPR, base, offset); | |
123 gsi_replace (&gsi, g, false); | |
124 } | |
125 gsi_next (&gsi); | |
126 } | |
127 } | |
128 | |
129 return 0; | |
130 } | |
131 | |
132 } // anon namespace | |
133 | |
134 gimple_opt_pass * | |
135 make_pass_laddress (gcc::context *ctxt) | |
136 { | |
137 return new pass_laddress (ctxt); | |
138 } |