Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-ccp.c @ 129:002ebcbc1eb4
remove test_env
| author | mir3636 |
|---|---|
| date | Tue, 15 May 2018 18:45:25 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Conditional constant propagation pass for the GNU compiler. |
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2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
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3 2010, 2011 Free Software Foundation, Inc. |
| 0 | 4 Adapted from original RTL SSA-CCP by Daniel Berlin <dberlin@dberlin.org> |
| 5 Adapted to GIMPLE trees by Diego Novillo <dnovillo@redhat.com> | |
| 6 | |
| 7 This file is part of GCC. | |
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8 |
| 0 | 9 GCC is free software; you can redistribute it and/or modify it |
| 10 under the terms of the GNU General Public License as published by the | |
| 11 Free Software Foundation; either version 3, or (at your option) any | |
| 12 later version. | |
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13 |
| 0 | 14 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 17 for more details. | |
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| 0 | 19 You should have received a copy of the GNU General Public License |
| 20 along with GCC; see the file COPYING3. If not see | |
| 21 <http://www.gnu.org/licenses/>. */ | |
| 22 | |
| 23 /* Conditional constant propagation (CCP) is based on the SSA | |
| 24 propagation engine (tree-ssa-propagate.c). Constant assignments of | |
| 25 the form VAR = CST are propagated from the assignments into uses of | |
| 26 VAR, which in turn may generate new constants. The simulation uses | |
| 27 a four level lattice to keep track of constant values associated | |
| 28 with SSA names. Given an SSA name V_i, it may take one of the | |
| 29 following values: | |
| 30 | |
| 31 UNINITIALIZED -> the initial state of the value. This value | |
| 32 is replaced with a correct initial value | |
| 33 the first time the value is used, so the | |
| 34 rest of the pass does not need to care about | |
| 35 it. Using this value simplifies initialization | |
| 36 of the pass, and prevents us from needlessly | |
| 37 scanning statements that are never reached. | |
| 38 | |
| 39 UNDEFINED -> V_i is a local variable whose definition | |
| 40 has not been processed yet. Therefore we | |
| 41 don't yet know if its value is a constant | |
| 42 or not. | |
| 43 | |
| 44 CONSTANT -> V_i has been found to hold a constant | |
| 45 value C. | |
| 46 | |
| 47 VARYING -> V_i cannot take a constant value, or if it | |
| 48 does, it is not possible to determine it | |
| 49 at compile time. | |
| 50 | |
| 51 The core of SSA-CCP is in ccp_visit_stmt and ccp_visit_phi_node: | |
| 52 | |
| 53 1- In ccp_visit_stmt, we are interested in assignments whose RHS | |
| 54 evaluates into a constant and conditional jumps whose predicate | |
| 55 evaluates into a boolean true or false. When an assignment of | |
| 56 the form V_i = CONST is found, V_i's lattice value is set to | |
| 57 CONSTANT and CONST is associated with it. This causes the | |
| 58 propagation engine to add all the SSA edges coming out the | |
| 59 assignment into the worklists, so that statements that use V_i | |
| 60 can be visited. | |
| 61 | |
| 62 If the statement is a conditional with a constant predicate, we | |
| 63 mark the outgoing edges as executable or not executable | |
| 64 depending on the predicate's value. This is then used when | |
| 65 visiting PHI nodes to know when a PHI argument can be ignored. | |
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66 |
| 0 | 67 |
| 68 2- In ccp_visit_phi_node, if all the PHI arguments evaluate to the | |
| 69 same constant C, then the LHS of the PHI is set to C. This | |
| 70 evaluation is known as the "meet operation". Since one of the | |
| 71 goals of this evaluation is to optimistically return constant | |
| 72 values as often as possible, it uses two main short cuts: | |
| 73 | |
| 74 - If an argument is flowing in through a non-executable edge, it | |
| 75 is ignored. This is useful in cases like this: | |
| 76 | |
| 77 if (PRED) | |
| 78 a_9 = 3; | |
| 79 else | |
| 80 a_10 = 100; | |
| 81 a_11 = PHI (a_9, a_10) | |
| 82 | |
| 83 If PRED is known to always evaluate to false, then we can | |
| 84 assume that a_11 will always take its value from a_10, meaning | |
| 85 that instead of consider it VARYING (a_9 and a_10 have | |
| 86 different values), we can consider it CONSTANT 100. | |
| 87 | |
| 88 - If an argument has an UNDEFINED value, then it does not affect | |
| 89 the outcome of the meet operation. If a variable V_i has an | |
| 90 UNDEFINED value, it means that either its defining statement | |
| 91 hasn't been visited yet or V_i has no defining statement, in | |
| 92 which case the original symbol 'V' is being used | |
| 93 uninitialized. Since 'V' is a local variable, the compiler | |
| 94 may assume any initial value for it. | |
| 95 | |
| 96 | |
| 97 After propagation, every variable V_i that ends up with a lattice | |
| 98 value of CONSTANT will have the associated constant value in the | |
| 99 array CONST_VAL[i].VALUE. That is fed into substitute_and_fold for | |
| 100 final substitution and folding. | |
| 101 | |
| 102 References: | |
| 103 | |
| 104 Constant propagation with conditional branches, | |
| 105 Wegman and Zadeck, ACM TOPLAS 13(2):181-210. | |
| 106 | |
| 107 Building an Optimizing Compiler, | |
| 108 Robert Morgan, Butterworth-Heinemann, 1998, Section 8.9. | |
| 109 | |
| 110 Advanced Compiler Design and Implementation, | |
| 111 Steven Muchnick, Morgan Kaufmann, 1997, Section 12.6 */ | |
| 112 | |
| 113 #include "config.h" | |
| 114 #include "system.h" | |
| 115 #include "coretypes.h" | |
| 116 #include "tm.h" | |
| 117 #include "tree.h" | |
| 118 #include "flags.h" | |
| 119 #include "tm_p.h" | |
| 120 #include "basic-block.h" | |
| 121 #include "output.h" | |
| 122 #include "function.h" | |
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123 #include "tree-pretty-print.h" |
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124 #include "gimple-pretty-print.h" |
| 0 | 125 #include "timevar.h" |
| 126 #include "tree-dump.h" | |
| 127 #include "tree-flow.h" | |
| 128 #include "tree-pass.h" | |
| 129 #include "tree-ssa-propagate.h" | |
| 130 #include "value-prof.h" | |
| 131 #include "langhooks.h" | |
| 132 #include "target.h" | |
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133 #include "diagnostic-core.h" |
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134 #include "dbgcnt.h" |
| 0 | 135 |
| 136 | |
| 137 /* Possible lattice values. */ | |
| 138 typedef enum | |
| 139 { | |
| 140 UNINITIALIZED, | |
| 141 UNDEFINED, | |
| 142 CONSTANT, | |
| 143 VARYING | |
| 144 } ccp_lattice_t; | |
| 145 | |
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146 struct prop_value_d { |
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147 /* Lattice value. */ |
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148 ccp_lattice_t lattice_val; |
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149 |
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150 /* Propagated value. */ |
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151 tree value; |
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152 |
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153 /* Mask that applies to the propagated value during CCP. For |
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154 X with a CONSTANT lattice value X & ~mask == value & ~mask. */ |
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155 double_int mask; |
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156 }; |
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157 |
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158 typedef struct prop_value_d prop_value_t; |
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159 |
| 0 | 160 /* Array of propagated constant values. After propagation, |
| 161 CONST_VAL[I].VALUE holds the constant value for SSA_NAME(I). If | |
| 162 the constant is held in an SSA name representing a memory store | |
| 163 (i.e., a VDEF), CONST_VAL[I].MEM_REF will contain the actual | |
| 164 memory reference used to store (i.e., the LHS of the assignment | |
| 165 doing the store). */ | |
| 166 static prop_value_t *const_val; | |
| 167 | |
| 168 static void canonicalize_float_value (prop_value_t *); | |
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169 static bool ccp_fold_stmt (gimple_stmt_iterator *); |
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170 static tree fold_ctor_reference (tree type, tree ctor, |
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171 unsigned HOST_WIDE_INT offset, |
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172 unsigned HOST_WIDE_INT size); |
| 0 | 173 |
| 174 /* Dump constant propagation value VAL to file OUTF prefixed by PREFIX. */ | |
| 175 | |
| 176 static void | |
| 177 dump_lattice_value (FILE *outf, const char *prefix, prop_value_t val) | |
| 178 { | |
| 179 switch (val.lattice_val) | |
| 180 { | |
| 181 case UNINITIALIZED: | |
| 182 fprintf (outf, "%sUNINITIALIZED", prefix); | |
| 183 break; | |
| 184 case UNDEFINED: | |
| 185 fprintf (outf, "%sUNDEFINED", prefix); | |
| 186 break; | |
| 187 case VARYING: | |
| 188 fprintf (outf, "%sVARYING", prefix); | |
| 189 break; | |
| 190 case CONSTANT: | |
| 191 fprintf (outf, "%sCONSTANT ", prefix); | |
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192 if (TREE_CODE (val.value) != INTEGER_CST |
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193 || double_int_zero_p (val.mask)) |
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194 print_generic_expr (outf, val.value, dump_flags); |
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195 else |
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196 { |
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197 double_int cval = double_int_and_not (tree_to_double_int (val.value), |
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198 val.mask); |
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199 fprintf (outf, "%sCONSTANT " HOST_WIDE_INT_PRINT_DOUBLE_HEX, |
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200 prefix, cval.high, cval.low); |
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201 fprintf (outf, " (" HOST_WIDE_INT_PRINT_DOUBLE_HEX ")", |
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202 val.mask.high, val.mask.low); |
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203 } |
| 0 | 204 break; |
| 205 default: | |
| 206 gcc_unreachable (); | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 | |
| 211 /* Print lattice value VAL to stderr. */ | |
| 212 | |
| 213 void debug_lattice_value (prop_value_t val); | |
| 214 | |
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215 DEBUG_FUNCTION void |
| 0 | 216 debug_lattice_value (prop_value_t val) |
| 217 { | |
| 218 dump_lattice_value (stderr, "", val); | |
| 219 fprintf (stderr, "\n"); | |
| 220 } | |
| 221 | |
| 222 | |
| 223 /* Compute a default value for variable VAR and store it in the | |
| 224 CONST_VAL array. The following rules are used to get default | |
| 225 values: | |
| 226 | |
| 227 1- Global and static variables that are declared constant are | |
| 228 considered CONSTANT. | |
| 229 | |
| 230 2- Any other value is considered UNDEFINED. This is useful when | |
| 231 considering PHI nodes. PHI arguments that are undefined do not | |
| 232 change the constant value of the PHI node, which allows for more | |
| 233 constants to be propagated. | |
| 234 | |
| 235 3- Variables defined by statements other than assignments and PHI | |
| 236 nodes are considered VARYING. | |
| 237 | |
| 238 4- Initial values of variables that are not GIMPLE registers are | |
| 239 considered VARYING. */ | |
| 240 | |
| 241 static prop_value_t | |
| 242 get_default_value (tree var) | |
| 243 { | |
| 244 tree sym = SSA_NAME_VAR (var); | |
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245 prop_value_t val = { UNINITIALIZED, NULL_TREE, { 0, 0 } }; |
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246 gimple stmt; |
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247 |
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248 stmt = SSA_NAME_DEF_STMT (var); |
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249 |
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250 if (gimple_nop_p (stmt)) |
| 0 | 251 { |
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252 /* Variables defined by an empty statement are those used |
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253 before being initialized. If VAR is a local variable, we |
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254 can assume initially that it is UNDEFINED, otherwise we must |
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255 consider it VARYING. */ |
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256 if (is_gimple_reg (sym) |
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257 && TREE_CODE (sym) == VAR_DECL) |
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258 val.lattice_val = UNDEFINED; |
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259 else |
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260 { |
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261 val.lattice_val = VARYING; |
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262 val.mask = double_int_minus_one; |
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263 } |
| 0 | 264 } |
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265 else if (is_gimple_assign (stmt) |
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266 /* Value-returning GIMPLE_CALL statements assign to |
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267 a variable, and are treated similarly to GIMPLE_ASSIGN. */ |
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268 || (is_gimple_call (stmt) |
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269 && gimple_call_lhs (stmt) != NULL_TREE) |
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270 || gimple_code (stmt) == GIMPLE_PHI) |
| 0 | 271 { |
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272 tree cst; |
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273 if (gimple_assign_single_p (stmt) |
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274 && DECL_P (gimple_assign_rhs1 (stmt)) |
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275 && (cst = get_symbol_constant_value (gimple_assign_rhs1 (stmt)))) |
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276 { |
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277 val.lattice_val = CONSTANT; |
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278 val.value = cst; |
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279 } |
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280 else |
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281 /* Any other variable defined by an assignment or a PHI node |
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282 is considered UNDEFINED. */ |
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283 val.lattice_val = UNDEFINED; |
| 0 | 284 } |
| 285 else | |
| 286 { | |
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287 /* Otherwise, VAR will never take on a constant value. */ |
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288 val.lattice_val = VARYING; |
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289 val.mask = double_int_minus_one; |
| 0 | 290 } |
| 291 | |
| 292 return val; | |
| 293 } | |
| 294 | |
| 295 | |
| 296 /* Get the constant value associated with variable VAR. */ | |
| 297 | |
| 298 static inline prop_value_t * | |
| 299 get_value (tree var) | |
| 300 { | |
| 301 prop_value_t *val; | |
| 302 | |
| 303 if (const_val == NULL) | |
| 304 return NULL; | |
| 305 | |
| 306 val = &const_val[SSA_NAME_VERSION (var)]; | |
| 307 if (val->lattice_val == UNINITIALIZED) | |
| 308 *val = get_default_value (var); | |
| 309 | |
| 310 canonicalize_float_value (val); | |
| 311 | |
| 312 return val; | |
| 313 } | |
| 314 | |
|
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315 /* Return the constant tree value associated with VAR. */ |
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316 |
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317 static inline tree |
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318 get_constant_value (tree var) |
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319 { |
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320 prop_value_t *val; |
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321 if (TREE_CODE (var) != SSA_NAME) |
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322 { |
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323 if (is_gimple_min_invariant (var)) |
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324 return var; |
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325 return NULL_TREE; |
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326 } |
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327 val = get_value (var); |
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328 if (val |
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329 && val->lattice_val == CONSTANT |
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330 && (TREE_CODE (val->value) != INTEGER_CST |
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331 || double_int_zero_p (val->mask))) |
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332 return val->value; |
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333 return NULL_TREE; |
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334 } |
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335 |
| 0 | 336 /* Sets the value associated with VAR to VARYING. */ |
| 337 | |
| 338 static inline void | |
| 339 set_value_varying (tree var) | |
| 340 { | |
| 341 prop_value_t *val = &const_val[SSA_NAME_VERSION (var)]; | |
| 342 | |
| 343 val->lattice_val = VARYING; | |
| 344 val->value = NULL_TREE; | |
|
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345 val->mask = double_int_minus_one; |
| 0 | 346 } |
| 347 | |
| 348 /* For float types, modify the value of VAL to make ccp work correctly | |
| 349 for non-standard values (-0, NaN): | |
| 350 | |
| 351 If HONOR_SIGNED_ZEROS is false, and VAL = -0, we canonicalize it to 0. | |
| 352 If HONOR_NANS is false, and VAL is NaN, we canonicalize it to UNDEFINED. | |
| 353 This is to fix the following problem (see PR 29921): Suppose we have | |
| 354 | |
| 355 x = 0.0 * y | |
| 356 | |
| 357 and we set value of y to NaN. This causes value of x to be set to NaN. | |
| 358 When we later determine that y is in fact VARYING, fold uses the fact | |
| 359 that HONOR_NANS is false, and we try to change the value of x to 0, | |
| 360 causing an ICE. With HONOR_NANS being false, the real appearance of | |
| 361 NaN would cause undefined behavior, though, so claiming that y (and x) | |
| 362 are UNDEFINED initially is correct. */ | |
| 363 | |
| 364 static void | |
| 365 canonicalize_float_value (prop_value_t *val) | |
| 366 { | |
| 367 enum machine_mode mode; | |
| 368 tree type; | |
| 369 REAL_VALUE_TYPE d; | |
| 370 | |
| 371 if (val->lattice_val != CONSTANT | |
| 372 || TREE_CODE (val->value) != REAL_CST) | |
| 373 return; | |
| 374 | |
| 375 d = TREE_REAL_CST (val->value); | |
| 376 type = TREE_TYPE (val->value); | |
| 377 mode = TYPE_MODE (type); | |
| 378 | |
| 379 if (!HONOR_SIGNED_ZEROS (mode) | |
| 380 && REAL_VALUE_MINUS_ZERO (d)) | |
| 381 { | |
| 382 val->value = build_real (type, dconst0); | |
| 383 return; | |
| 384 } | |
| 385 | |
| 386 if (!HONOR_NANS (mode) | |
| 387 && REAL_VALUE_ISNAN (d)) | |
| 388 { | |
| 389 val->lattice_val = UNDEFINED; | |
| 390 val->value = NULL; | |
| 391 return; | |
| 392 } | |
| 393 } | |
| 394 | |
|
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395 /* Return whether the lattice transition is valid. */ |
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396 |
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397 static bool |
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398 valid_lattice_transition (prop_value_t old_val, prop_value_t new_val) |
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399 { |
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400 /* Lattice transitions must always be monotonically increasing in |
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401 value. */ |
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402 if (old_val.lattice_val < new_val.lattice_val) |
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403 return true; |
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404 |
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405 if (old_val.lattice_val != new_val.lattice_val) |
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406 return false; |
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407 |
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408 if (!old_val.value && !new_val.value) |
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409 return true; |
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410 |
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411 /* Now both lattice values are CONSTANT. */ |
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412 |
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413 /* Allow transitioning from &x to &x & ~3. */ |
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414 if (TREE_CODE (old_val.value) != INTEGER_CST |
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415 && TREE_CODE (new_val.value) == INTEGER_CST) |
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416 return true; |
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417 |
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418 /* Bit-lattices have to agree in the still valid bits. */ |
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419 if (TREE_CODE (old_val.value) == INTEGER_CST |
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420 && TREE_CODE (new_val.value) == INTEGER_CST) |
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421 return double_int_equal_p |
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422 (double_int_and_not (tree_to_double_int (old_val.value), |
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423 new_val.mask), |
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424 double_int_and_not (tree_to_double_int (new_val.value), |
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425 new_val.mask)); |
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426 |
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427 /* Otherwise constant values have to agree. */ |
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428 return operand_equal_p (old_val.value, new_val.value, 0); |
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429 } |
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430 |
| 0 | 431 /* Set the value for variable VAR to NEW_VAL. Return true if the new |
| 432 value is different from VAR's previous value. */ | |
| 433 | |
| 434 static bool | |
| 435 set_lattice_value (tree var, prop_value_t new_val) | |
| 436 { | |
|
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437 /* We can deal with old UNINITIALIZED values just fine here. */ |
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438 prop_value_t *old_val = &const_val[SSA_NAME_VERSION (var)]; |
| 0 | 439 |
| 440 canonicalize_float_value (&new_val); | |
| 441 | |
|
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442 /* We have to be careful to not go up the bitwise lattice |
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443 represented by the mask. |
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444 ??? This doesn't seem to be the best place to enforce this. */ |
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445 if (new_val.lattice_val == CONSTANT |
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446 && old_val->lattice_val == CONSTANT |
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447 && TREE_CODE (new_val.value) == INTEGER_CST |
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448 && TREE_CODE (old_val->value) == INTEGER_CST) |
| 0 | 449 { |
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450 double_int diff; |
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451 diff = double_int_xor (tree_to_double_int (new_val.value), |
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452 tree_to_double_int (old_val->value)); |
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453 new_val.mask = double_int_ior (new_val.mask, |
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454 double_int_ior (old_val->mask, diff)); |
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455 } |
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456 |
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457 gcc_assert (valid_lattice_transition (*old_val, new_val)); |
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458 |
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459 /* If *OLD_VAL and NEW_VAL are the same, return false to inform the |
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460 caller that this was a non-transition. */ |
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461 if (old_val->lattice_val != new_val.lattice_val |
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462 || (new_val.lattice_val == CONSTANT |
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463 && TREE_CODE (new_val.value) == INTEGER_CST |
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464 && (TREE_CODE (old_val->value) != INTEGER_CST |
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465 || !double_int_equal_p (new_val.mask, old_val->mask)))) |
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466 { |
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467 /* ??? We would like to delay creation of INTEGER_CSTs from |
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468 partially constants here. */ |
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469 |
| 0 | 470 if (dump_file && (dump_flags & TDF_DETAILS)) |
| 471 { | |
| 472 dump_lattice_value (dump_file, "Lattice value changed to ", new_val); | |
| 473 fprintf (dump_file, ". Adding SSA edges to worklist.\n"); | |
| 474 } | |
| 475 | |
| 476 *old_val = new_val; | |
| 477 | |
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478 gcc_assert (new_val.lattice_val != UNINITIALIZED); |
| 0 | 479 return true; |
| 480 } | |
| 481 | |
| 482 return false; | |
| 483 } | |
| 484 | |
|
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485 static prop_value_t get_value_for_expr (tree, bool); |
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486 static prop_value_t bit_value_binop (enum tree_code, tree, tree, tree); |
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487 static void bit_value_binop_1 (enum tree_code, tree, double_int *, double_int *, |
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488 tree, double_int, double_int, |
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489 tree, double_int, double_int); |
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490 |
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491 /* Return a double_int that can be used for bitwise simplifications |
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492 from VAL. */ |
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493 |
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494 static double_int |
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495 value_to_double_int (prop_value_t val) |
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496 { |
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497 if (val.value |
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498 && TREE_CODE (val.value) == INTEGER_CST) |
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499 return tree_to_double_int (val.value); |
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500 else |
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501 return double_int_zero; |
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502 } |
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503 |
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504 /* Return the value for the address expression EXPR based on alignment |
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505 information. */ |
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506 |
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507 static prop_value_t |
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508 get_value_from_alignment (tree expr) |
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509 { |
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510 prop_value_t val; |
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511 HOST_WIDE_INT bitsize, bitpos; |
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512 tree base, offset; |
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513 enum machine_mode mode; |
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514 int align; |
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515 |
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516 gcc_assert (TREE_CODE (expr) == ADDR_EXPR); |
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517 |
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518 base = get_inner_reference (TREE_OPERAND (expr, 0), |
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519 &bitsize, &bitpos, &offset, |
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520 &mode, &align, &align, false); |
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521 if (TREE_CODE (base) == MEM_REF) |
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522 val = bit_value_binop (PLUS_EXPR, TREE_TYPE (expr), |
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523 TREE_OPERAND (base, 0), TREE_OPERAND (base, 1)); |
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524 else if (base |
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525 /* ??? While function decls have DECL_ALIGN their addresses |
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526 may encode extra information in the lower bits on some |
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527 targets (PR47239). Simply punt for function decls for now. */ |
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528 && TREE_CODE (base) != FUNCTION_DECL |
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529 && ((align = get_object_alignment (base, BIGGEST_ALIGNMENT)) |
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530 > BITS_PER_UNIT)) |
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531 { |
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532 val.lattice_val = CONSTANT; |
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533 /* We assume pointers are zero-extended. */ |
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534 val.mask = double_int_and_not |
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535 (double_int_mask (TYPE_PRECISION (TREE_TYPE (expr))), |
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536 uhwi_to_double_int (align / BITS_PER_UNIT - 1)); |
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537 val.value = build_int_cst (TREE_TYPE (expr), 0); |
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538 } |
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539 else |
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540 { |
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541 val.lattice_val = VARYING; |
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542 val.mask = double_int_minus_one; |
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543 val.value = NULL_TREE; |
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544 } |
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545 if (bitpos != 0) |
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546 { |
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547 double_int value, mask; |
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548 bit_value_binop_1 (PLUS_EXPR, TREE_TYPE (expr), &value, &mask, |
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549 TREE_TYPE (expr), value_to_double_int (val), val.mask, |
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550 TREE_TYPE (expr), |
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551 shwi_to_double_int (bitpos / BITS_PER_UNIT), |
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552 double_int_zero); |
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553 val.lattice_val = double_int_minus_one_p (mask) ? VARYING : CONSTANT; |
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554 val.mask = mask; |
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555 if (val.lattice_val == CONSTANT) |
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556 val.value = double_int_to_tree (TREE_TYPE (expr), value); |
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557 else |
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558 val.value = NULL_TREE; |
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559 } |
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560 /* ??? We should handle i * 4 and more complex expressions from |
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561 the offset, possibly by just expanding get_value_for_expr. */ |
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562 if (offset != NULL_TREE) |
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563 { |
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564 double_int value, mask; |
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565 prop_value_t oval = get_value_for_expr (offset, true); |
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566 bit_value_binop_1 (PLUS_EXPR, TREE_TYPE (expr), &value, &mask, |
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567 TREE_TYPE (expr), value_to_double_int (val), val.mask, |
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568 TREE_TYPE (expr), value_to_double_int (oval), |
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569 oval.mask); |
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570 val.mask = mask; |
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571 if (double_int_minus_one_p (mask)) |
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572 { |
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573 val.lattice_val = VARYING; |
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574 val.value = NULL_TREE; |
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575 } |
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576 else |
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577 { |
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578 val.lattice_val = CONSTANT; |
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579 val.value = double_int_to_tree (TREE_TYPE (expr), value); |
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580 } |
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581 } |
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582 |
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583 return val; |
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584 } |
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585 |
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586 /* Return the value for the tree operand EXPR. If FOR_BITS_P is true |
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587 return constant bits extracted from alignment information for |
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588 invariant addresses. */ |
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589 |
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590 static prop_value_t |
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591 get_value_for_expr (tree expr, bool for_bits_p) |
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592 { |
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593 prop_value_t val; |
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594 |
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595 if (TREE_CODE (expr) == SSA_NAME) |
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596 { |
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597 val = *get_value (expr); |
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598 if (for_bits_p |
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599 && val.lattice_val == CONSTANT |
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600 && TREE_CODE (val.value) == ADDR_EXPR) |
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601 val = get_value_from_alignment (val.value); |
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602 } |
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603 else if (is_gimple_min_invariant (expr) |
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604 && (!for_bits_p || TREE_CODE (expr) != ADDR_EXPR)) |
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605 { |
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606 val.lattice_val = CONSTANT; |
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607 val.value = expr; |
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608 val.mask = double_int_zero; |
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609 canonicalize_float_value (&val); |
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610 } |
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611 else if (TREE_CODE (expr) == ADDR_EXPR) |
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612 val = get_value_from_alignment (expr); |
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613 else |
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614 { |
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615 val.lattice_val = VARYING; |
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616 val.mask = double_int_minus_one; |
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617 val.value = NULL_TREE; |
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618 } |
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619 return val; |
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620 } |
| 0 | 621 |
| 622 /* Return the likely CCP lattice value for STMT. | |
| 623 | |
| 624 If STMT has no operands, then return CONSTANT. | |
| 625 | |
| 626 Else if undefinedness of operands of STMT cause its value to be | |
| 627 undefined, then return UNDEFINED. | |
| 628 | |
| 629 Else if any operands of STMT are constants, then return CONSTANT. | |
| 630 | |
| 631 Else return VARYING. */ | |
| 632 | |
| 633 static ccp_lattice_t | |
| 634 likely_value (gimple stmt) | |
| 635 { | |
| 636 bool has_constant_operand, has_undefined_operand, all_undefined_operands; | |
| 637 tree use; | |
| 638 ssa_op_iter iter; | |
|
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639 unsigned i; |
| 0 | 640 |
| 641 enum gimple_code code = gimple_code (stmt); | |
| 642 | |
| 643 /* This function appears to be called only for assignments, calls, | |
| 644 conditionals, and switches, due to the logic in visit_stmt. */ | |
| 645 gcc_assert (code == GIMPLE_ASSIGN | |
| 646 || code == GIMPLE_CALL | |
| 647 || code == GIMPLE_COND | |
| 648 || code == GIMPLE_SWITCH); | |
| 649 | |
| 650 /* If the statement has volatile operands, it won't fold to a | |
| 651 constant value. */ | |
| 652 if (gimple_has_volatile_ops (stmt)) | |
| 653 return VARYING; | |
| 654 | |
| 655 /* Arrive here for more complex cases. */ | |
| 656 has_constant_operand = false; | |
| 657 has_undefined_operand = false; | |
| 658 all_undefined_operands = true; | |
|
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659 FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE) |
| 0 | 660 { |
| 661 prop_value_t *val = get_value (use); | |
| 662 | |
| 663 if (val->lattice_val == UNDEFINED) | |
| 664 has_undefined_operand = true; | |
| 665 else | |
| 666 all_undefined_operands = false; | |
| 667 | |
| 668 if (val->lattice_val == CONSTANT) | |
| 669 has_constant_operand = true; | |
| 670 } | |
| 671 | |
|
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672 /* There may be constants in regular rhs operands. For calls we |
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673 have to ignore lhs, fndecl and static chain, otherwise only |
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674 the lhs. */ |
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675 for (i = (is_gimple_call (stmt) ? 2 : 0) + gimple_has_lhs (stmt); |
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676 i < gimple_num_ops (stmt); ++i) |
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677 { |
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678 tree op = gimple_op (stmt, i); |
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679 if (!op || TREE_CODE (op) == SSA_NAME) |
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680 continue; |
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681 if (is_gimple_min_invariant (op)) |
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682 has_constant_operand = true; |
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683 } |
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684 |
|
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685 if (has_constant_operand) |
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686 all_undefined_operands = false; |
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|
687 |
| 0 | 688 /* If the operation combines operands like COMPLEX_EXPR make sure to |
| 689 not mark the result UNDEFINED if only one part of the result is | |
| 690 undefined. */ | |
| 691 if (has_undefined_operand && all_undefined_operands) | |
| 692 return UNDEFINED; | |
| 693 else if (code == GIMPLE_ASSIGN && has_undefined_operand) | |
| 694 { | |
| 695 switch (gimple_assign_rhs_code (stmt)) | |
| 696 { | |
| 697 /* Unary operators are handled with all_undefined_operands. */ | |
| 698 case PLUS_EXPR: | |
| 699 case MINUS_EXPR: | |
| 700 case POINTER_PLUS_EXPR: | |
| 701 /* Not MIN_EXPR, MAX_EXPR. One VARYING operand may be selected. | |
| 702 Not bitwise operators, one VARYING operand may specify the | |
| 703 result completely. Not logical operators for the same reason. | |
| 704 Not COMPLEX_EXPR as one VARYING operand makes the result partly | |
| 705 not UNDEFINED. Not *DIV_EXPR, comparisons and shifts because | |
| 706 the undefined operand may be promoted. */ | |
| 707 return UNDEFINED; | |
| 708 | |
| 709 default: | |
| 710 ; | |
| 711 } | |
| 712 } | |
| 713 /* If there was an UNDEFINED operand but the result may be not UNDEFINED | |
| 714 fall back to VARYING even if there were CONSTANT operands. */ | |
| 715 if (has_undefined_operand) | |
| 716 return VARYING; | |
| 717 | |
|
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718 /* We do not consider virtual operands here -- load from read-only |
|
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719 memory may have only VARYING virtual operands, but still be |
|
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720 constant. */ |
| 0 | 721 if (has_constant_operand |
|
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722 || gimple_references_memory_p (stmt)) |
| 0 | 723 return CONSTANT; |
| 724 | |
| 725 return VARYING; | |
| 726 } | |
| 727 | |
| 728 /* Returns true if STMT cannot be constant. */ | |
| 729 | |
| 730 static bool | |
| 731 surely_varying_stmt_p (gimple stmt) | |
| 732 { | |
| 733 /* If the statement has operands that we cannot handle, it cannot be | |
| 734 constant. */ | |
| 735 if (gimple_has_volatile_ops (stmt)) | |
| 736 return true; | |
| 737 | |
| 738 /* If it is a call and does not return a value or is not a | |
| 739 builtin and not an indirect call, it is varying. */ | |
| 740 if (is_gimple_call (stmt)) | |
| 741 { | |
| 742 tree fndecl; | |
| 743 if (!gimple_call_lhs (stmt) | |
| 744 || ((fndecl = gimple_call_fndecl (stmt)) != NULL_TREE | |
| 745 && !DECL_BUILT_IN (fndecl))) | |
| 746 return true; | |
| 747 } | |
| 748 | |
|
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749 /* Any other store operation is not interesting. */ |
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750 else if (gimple_vdef (stmt)) |
|
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751 return true; |
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752 |
| 0 | 753 /* Anything other than assignments and conditional jumps are not |
| 754 interesting for CCP. */ | |
| 755 if (gimple_code (stmt) != GIMPLE_ASSIGN | |
| 756 && gimple_code (stmt) != GIMPLE_COND | |
| 757 && gimple_code (stmt) != GIMPLE_SWITCH | |
| 758 && gimple_code (stmt) != GIMPLE_CALL) | |
| 759 return true; | |
| 760 | |
| 761 return false; | |
| 762 } | |
| 763 | |
| 764 /* Initialize local data structures for CCP. */ | |
| 765 | |
| 766 static void | |
| 767 ccp_initialize (void) | |
| 768 { | |
| 769 basic_block bb; | |
| 770 | |
| 771 const_val = XCNEWVEC (prop_value_t, num_ssa_names); | |
| 772 | |
| 773 /* Initialize simulation flags for PHI nodes and statements. */ | |
| 774 FOR_EACH_BB (bb) | |
| 775 { | |
| 776 gimple_stmt_iterator i; | |
| 777 | |
| 778 for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i)) | |
| 779 { | |
| 780 gimple stmt = gsi_stmt (i); | |
|
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781 bool is_varying; |
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782 |
|
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783 /* If the statement is a control insn, then we do not |
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784 want to avoid simulating the statement once. Failure |
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785 to do so means that those edges will never get added. */ |
|
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786 if (stmt_ends_bb_p (stmt)) |
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787 is_varying = false; |
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788 else |
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789 is_varying = surely_varying_stmt_p (stmt); |
| 0 | 790 |
| 791 if (is_varying) | |
| 792 { | |
| 793 tree def; | |
| 794 ssa_op_iter iter; | |
| 795 | |
| 796 /* If the statement will not produce a constant, mark | |
| 797 all its outputs VARYING. */ | |
| 798 FOR_EACH_SSA_TREE_OPERAND (def, stmt, iter, SSA_OP_ALL_DEFS) | |
|
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799 set_value_varying (def); |
| 0 | 800 } |
| 801 prop_set_simulate_again (stmt, !is_varying); | |
| 802 } | |
| 803 } | |
| 804 | |
| 805 /* Now process PHI nodes. We never clear the simulate_again flag on | |
| 806 phi nodes, since we do not know which edges are executable yet, | |
| 807 except for phi nodes for virtual operands when we do not do store ccp. */ | |
| 808 FOR_EACH_BB (bb) | |
| 809 { | |
| 810 gimple_stmt_iterator i; | |
| 811 | |
| 812 for (i = gsi_start_phis (bb); !gsi_end_p (i); gsi_next (&i)) | |
| 813 { | |
| 814 gimple phi = gsi_stmt (i); | |
| 815 | |
| 816 if (!is_gimple_reg (gimple_phi_result (phi))) | |
| 817 prop_set_simulate_again (phi, false); | |
| 818 else | |
| 819 prop_set_simulate_again (phi, true); | |
| 820 } | |
| 821 } | |
| 822 } | |
| 823 | |
|
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824 /* Debug count support. Reset the values of ssa names |
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825 VARYING when the total number ssa names analyzed is |
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826 beyond the debug count specified. */ |
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827 |
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828 static void |
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829 do_dbg_cnt (void) |
|
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|
830 { |
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831 unsigned i; |
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832 for (i = 0; i < num_ssa_names; i++) |
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833 { |
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834 if (!dbg_cnt (ccp)) |
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835 { |
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836 const_val[i].lattice_val = VARYING; |
|
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837 const_val[i].mask = double_int_minus_one; |
|
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838 const_val[i].value = NULL_TREE; |
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839 } |
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840 } |
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841 } |
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842 |
| 0 | 843 |
| 844 /* Do final substitution of propagated values, cleanup the flowgraph and | |
|
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845 free allocated storage. |
| 0 | 846 |
| 847 Return TRUE when something was optimized. */ | |
| 848 | |
| 849 static bool | |
| 850 ccp_finalize (void) | |
| 851 { | |
|
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852 bool something_changed; |
|
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853 unsigned i; |
|
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854 |
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855 do_dbg_cnt (); |
|
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856 |
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857 /* Derive alignment and misalignment information from partially |
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858 constant pointers in the lattice. */ |
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859 for (i = 1; i < num_ssa_names; ++i) |
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860 { |
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861 tree name = ssa_name (i); |
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862 prop_value_t *val; |
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863 struct ptr_info_def *pi; |
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864 unsigned int tem, align; |
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865 |
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866 if (!name |
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867 || !POINTER_TYPE_P (TREE_TYPE (name))) |
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868 continue; |
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869 |
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870 val = get_value (name); |
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871 if (val->lattice_val != CONSTANT |
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872 || TREE_CODE (val->value) != INTEGER_CST) |
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873 continue; |
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874 |
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875 /* Trailing constant bits specify the alignment, trailing value |
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876 bits the misalignment. */ |
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877 tem = val->mask.low; |
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878 align = (tem & -tem); |
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879 if (align == 1) |
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880 continue; |
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881 |
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882 pi = get_ptr_info (name); |
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883 pi->align = align; |
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884 pi->misalign = TREE_INT_CST_LOW (val->value) & (align - 1); |
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885 } |
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886 |
| 0 | 887 /* Perform substitutions based on the known constant values. */ |
|
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888 something_changed = substitute_and_fold (get_constant_value, |
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889 ccp_fold_stmt, true); |
| 0 | 890 |
| 891 free (const_val); | |
| 892 const_val = NULL; | |
| 893 return something_changed;; | |
| 894 } | |
| 895 | |
| 896 | |
| 897 /* Compute the meet operator between *VAL1 and *VAL2. Store the result | |
| 898 in VAL1. | |
| 899 | |
| 900 any M UNDEFINED = any | |
| 901 any M VARYING = VARYING | |
| 902 Ci M Cj = Ci if (i == j) | |
| 903 Ci M Cj = VARYING if (i != j) | |
| 904 */ | |
| 905 | |
| 906 static void | |
| 907 ccp_lattice_meet (prop_value_t *val1, prop_value_t *val2) | |
| 908 { | |
| 909 if (val1->lattice_val == UNDEFINED) | |
| 910 { | |
| 911 /* UNDEFINED M any = any */ | |
| 912 *val1 = *val2; | |
| 913 } | |
| 914 else if (val2->lattice_val == UNDEFINED) | |
| 915 { | |
| 916 /* any M UNDEFINED = any | |
| 917 Nothing to do. VAL1 already contains the value we want. */ | |
| 918 ; | |
| 919 } | |
| 920 else if (val1->lattice_val == VARYING | |
| 921 || val2->lattice_val == VARYING) | |
| 922 { | |
| 923 /* any M VARYING = VARYING. */ | |
| 924 val1->lattice_val = VARYING; | |
|
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925 val1->mask = double_int_minus_one; |
| 0 | 926 val1->value = NULL_TREE; |
| 927 } | |
| 928 else if (val1->lattice_val == CONSTANT | |
| 929 && val2->lattice_val == CONSTANT | |
|
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930 && TREE_CODE (val1->value) == INTEGER_CST |
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931 && TREE_CODE (val2->value) == INTEGER_CST) |
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932 { |
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933 /* Ci M Cj = Ci if (i == j) |
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934 Ci M Cj = VARYING if (i != j) |
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935 |
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936 For INTEGER_CSTs mask unequal bits. If no equal bits remain, |
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937 drop to varying. */ |
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938 val1->mask |
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939 = double_int_ior (double_int_ior (val1->mask, |
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940 val2->mask), |
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941 double_int_xor (tree_to_double_int (val1->value), |
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942 tree_to_double_int (val2->value))); |
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943 if (double_int_minus_one_p (val1->mask)) |
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944 { |
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945 val1->lattice_val = VARYING; |
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946 val1->value = NULL_TREE; |
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947 } |
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948 } |
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949 else if (val1->lattice_val == CONSTANT |
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950 && val2->lattice_val == CONSTANT |
| 0 | 951 && simple_cst_equal (val1->value, val2->value) == 1) |
| 952 { | |
| 953 /* Ci M Cj = Ci if (i == j) | |
| 954 Ci M Cj = VARYING if (i != j) | |
| 955 | |
|
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956 VAL1 already contains the value we want for equivalent values. */ |
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957 } |
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958 else if (val1->lattice_val == CONSTANT |
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959 && val2->lattice_val == CONSTANT |
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960 && (TREE_CODE (val1->value) == ADDR_EXPR |
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961 || TREE_CODE (val2->value) == ADDR_EXPR)) |
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962 { |
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963 /* When not equal addresses are involved try meeting for |
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964 alignment. */ |
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965 prop_value_t tem = *val2; |
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966 if (TREE_CODE (val1->value) == ADDR_EXPR) |
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967 *val1 = get_value_for_expr (val1->value, true); |
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968 if (TREE_CODE (val2->value) == ADDR_EXPR) |
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969 tem = get_value_for_expr (val2->value, true); |
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970 ccp_lattice_meet (val1, &tem); |
| 0 | 971 } |
| 972 else | |
| 973 { | |
| 974 /* Any other combination is VARYING. */ | |
| 975 val1->lattice_val = VARYING; | |
|
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976 val1->mask = double_int_minus_one; |
| 0 | 977 val1->value = NULL_TREE; |
| 978 } | |
| 979 } | |
| 980 | |
| 981 | |
| 982 /* Loop through the PHI_NODE's parameters for BLOCK and compare their | |
| 983 lattice values to determine PHI_NODE's lattice value. The value of a | |
| 984 PHI node is determined calling ccp_lattice_meet with all the arguments | |
| 985 of the PHI node that are incoming via executable edges. */ | |
| 986 | |
| 987 static enum ssa_prop_result | |
| 988 ccp_visit_phi_node (gimple phi) | |
| 989 { | |
| 990 unsigned i; | |
| 991 prop_value_t *old_val, new_val; | |
| 992 | |
| 993 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 994 { | |
| 995 fprintf (dump_file, "\nVisiting PHI node: "); | |
| 996 print_gimple_stmt (dump_file, phi, 0, dump_flags); | |
| 997 } | |
| 998 | |
| 999 old_val = get_value (gimple_phi_result (phi)); | |
| 1000 switch (old_val->lattice_val) | |
| 1001 { | |
| 1002 case VARYING: | |
| 1003 return SSA_PROP_VARYING; | |
| 1004 | |
| 1005 case CONSTANT: | |
| 1006 new_val = *old_val; | |
| 1007 break; | |
| 1008 | |
| 1009 case UNDEFINED: | |
| 1010 new_val.lattice_val = UNDEFINED; | |
| 1011 new_val.value = NULL_TREE; | |
| 1012 break; | |
| 1013 | |
| 1014 default: | |
| 1015 gcc_unreachable (); | |
| 1016 } | |
| 1017 | |
| 1018 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 1019 { | |
| 1020 /* Compute the meet operator over all the PHI arguments flowing | |
| 1021 through executable edges. */ | |
| 1022 edge e = gimple_phi_arg_edge (phi, i); | |
| 1023 | |
| 1024 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1025 { | |
| 1026 fprintf (dump_file, | |
| 1027 "\n Argument #%d (%d -> %d %sexecutable)\n", | |
| 1028 i, e->src->index, e->dest->index, | |
| 1029 (e->flags & EDGE_EXECUTABLE) ? "" : "not "); | |
| 1030 } | |
| 1031 | |
| 1032 /* If the incoming edge is executable, Compute the meet operator for | |
| 1033 the existing value of the PHI node and the current PHI argument. */ | |
| 1034 if (e->flags & EDGE_EXECUTABLE) | |
| 1035 { | |
| 1036 tree arg = gimple_phi_arg (phi, i)->def; | |
|
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1037 prop_value_t arg_val = get_value_for_expr (arg, false); |
| 0 | 1038 |
| 1039 ccp_lattice_meet (&new_val, &arg_val); | |
| 1040 | |
| 1041 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1042 { | |
| 1043 fprintf (dump_file, "\t"); | |
| 1044 print_generic_expr (dump_file, arg, dump_flags); | |
| 1045 dump_lattice_value (dump_file, "\tValue: ", arg_val); | |
| 1046 fprintf (dump_file, "\n"); | |
| 1047 } | |
| 1048 | |
| 1049 if (new_val.lattice_val == VARYING) | |
| 1050 break; | |
| 1051 } | |
| 1052 } | |
| 1053 | |
| 1054 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1055 { | |
| 1056 dump_lattice_value (dump_file, "\n PHI node value: ", new_val); | |
| 1057 fprintf (dump_file, "\n\n"); | |
| 1058 } | |
| 1059 | |
| 1060 /* Make the transition to the new value. */ | |
| 1061 if (set_lattice_value (gimple_phi_result (phi), new_val)) | |
| 1062 { | |
| 1063 if (new_val.lattice_val == VARYING) | |
| 1064 return SSA_PROP_VARYING; | |
| 1065 else | |
| 1066 return SSA_PROP_INTERESTING; | |
| 1067 } | |
| 1068 else | |
| 1069 return SSA_PROP_NOT_INTERESTING; | |
| 1070 } | |
| 1071 | |
|
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1072 /* Return the constant value for OP or OP otherwise. */ |
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1073 |
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1074 static tree |
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1075 valueize_op (tree op) |
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1076 { |
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1077 if (TREE_CODE (op) == SSA_NAME) |
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1078 { |
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1079 tree tem = get_constant_value (op); |
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1080 if (tem) |
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1081 return tem; |
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1082 } |
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1083 return op; |
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1084 } |
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1085 |
| 0 | 1086 /* CCP specific front-end to the non-destructive constant folding |
| 1087 routines. | |
| 1088 | |
| 1089 Attempt to simplify the RHS of STMT knowing that one or more | |
| 1090 operands are constants. | |
| 1091 | |
| 1092 If simplification is possible, return the simplified RHS, | |
| 1093 otherwise return the original RHS or NULL_TREE. */ | |
| 1094 | |
| 1095 static tree | |
| 1096 ccp_fold (gimple stmt) | |
| 1097 { | |
|
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1098 location_t loc = gimple_location (stmt); |
| 0 | 1099 switch (gimple_code (stmt)) |
| 1100 { | |
| 1101 case GIMPLE_ASSIGN: | |
| 1102 { | |
| 1103 enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
| 1104 | |
| 1105 switch (get_gimple_rhs_class (subcode)) | |
| 1106 { | |
| 1107 case GIMPLE_SINGLE_RHS: | |
| 1108 { | |
| 1109 tree rhs = gimple_assign_rhs1 (stmt); | |
| 1110 enum tree_code_class kind = TREE_CODE_CLASS (subcode); | |
| 1111 | |
| 1112 if (TREE_CODE (rhs) == SSA_NAME) | |
| 1113 { | |
| 1114 /* If the RHS is an SSA_NAME, return its known constant value, | |
| 1115 if any. */ | |
|
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1116 return get_constant_value (rhs); |
| 0 | 1117 } |
| 1118 /* Handle propagating invariant addresses into address operations. | |
| 1119 The folding we do here matches that in tree-ssa-forwprop.c. */ | |
| 1120 else if (TREE_CODE (rhs) == ADDR_EXPR) | |
| 1121 { | |
| 1122 tree *base; | |
| 1123 base = &TREE_OPERAND (rhs, 0); | |
| 1124 while (handled_component_p (*base)) | |
| 1125 base = &TREE_OPERAND (*base, 0); | |
|
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1126 if (TREE_CODE (*base) == MEM_REF |
| 0 | 1127 && TREE_CODE (TREE_OPERAND (*base, 0)) == SSA_NAME) |
| 1128 { | |
|
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1129 tree val = get_constant_value (TREE_OPERAND (*base, 0)); |
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1130 if (val |
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1131 && TREE_CODE (val) == ADDR_EXPR) |
| 0 | 1132 { |
|
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1133 tree ret, save = *base; |
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1134 tree new_base; |
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1135 new_base = fold_build2 (MEM_REF, TREE_TYPE (*base), |
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1136 unshare_expr (val), |
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1137 TREE_OPERAND (*base, 1)); |
| 0 | 1138 /* We need to return a new tree, not modify the IL |
| 1139 or share parts of it. So play some tricks to | |
| 1140 avoid manually building it. */ | |
|
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1141 *base = new_base; |
| 0 | 1142 ret = unshare_expr (rhs); |
| 1143 recompute_tree_invariant_for_addr_expr (ret); | |
| 1144 *base = save; | |
| 1145 return ret; | |
| 1146 } | |
| 1147 } | |
| 1148 } | |
|
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1149 else if (TREE_CODE (rhs) == CONSTRUCTOR |
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1150 && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE |
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1151 && (CONSTRUCTOR_NELTS (rhs) |
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1152 == TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)))) |
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1153 { |
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1154 unsigned i; |
|
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1155 tree val, list; |
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1156 |
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1157 list = NULL_TREE; |
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1158 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) |
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1159 { |
|
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1160 val = valueize_op (val); |
|
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1161 if (TREE_CODE (val) == INTEGER_CST |
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1162 || TREE_CODE (val) == REAL_CST |
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1163 || TREE_CODE (val) == FIXED_CST) |
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1164 list = tree_cons (NULL_TREE, val, list); |
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1165 else |
|
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1166 return NULL_TREE; |
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1167 } |
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1168 |
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1169 return build_vector (TREE_TYPE (rhs), nreverse (list)); |
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1170 } |
| 0 | 1171 |
| 1172 if (kind == tcc_reference) | |
| 1173 { | |
|
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1174 if ((TREE_CODE (rhs) == VIEW_CONVERT_EXPR |
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1175 || TREE_CODE (rhs) == REALPART_EXPR |
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1176 || TREE_CODE (rhs) == IMAGPART_EXPR) |
| 0 | 1177 && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) |
| 1178 { | |
|
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1179 tree val = get_constant_value (TREE_OPERAND (rhs, 0)); |
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1180 if (val) |
|
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1181 return fold_unary_loc (EXPR_LOCATION (rhs), |
|
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1182 TREE_CODE (rhs), |
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1183 TREE_TYPE (rhs), val); |
| 0 | 1184 } |
|
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1185 else if (TREE_CODE (rhs) == MEM_REF |
|
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1186 && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) |
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1187 { |
|
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1188 tree val = get_constant_value (TREE_OPERAND (rhs, 0)); |
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1189 if (val |
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1190 && TREE_CODE (val) == ADDR_EXPR) |
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1191 { |
|
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1192 tree tem = fold_build2 (MEM_REF, TREE_TYPE (rhs), |
|
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1193 unshare_expr (val), |
|
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1194 TREE_OPERAND (rhs, 1)); |
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1195 if (tem) |
|
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1196 rhs = tem; |
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1197 } |
|
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1198 } |
| 0 | 1199 return fold_const_aggregate_ref (rhs); |
| 1200 } | |
| 1201 else if (kind == tcc_declaration) | |
| 1202 return get_symbol_constant_value (rhs); | |
| 1203 return rhs; | |
| 1204 } | |
|
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1205 |
| 0 | 1206 case GIMPLE_UNARY_RHS: |
| 1207 { | |
| 1208 /* Handle unary operators that can appear in GIMPLE form. | |
| 1209 Note that we know the single operand must be a constant, | |
| 1210 so this should almost always return a simplified RHS. */ | |
| 1211 tree lhs = gimple_assign_lhs (stmt); | |
|
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1212 tree op0 = valueize_op (gimple_assign_rhs1 (stmt)); |
| 0 | 1213 |
| 1214 /* Conversions are useless for CCP purposes if they are | |
| 1215 value-preserving. Thus the restrictions that | |
| 1216 useless_type_conversion_p places for pointer type conversions | |
| 1217 do not apply here. Substitution later will only substitute to | |
| 1218 allowed places. */ | |
| 1219 if (CONVERT_EXPR_CODE_P (subcode) | |
| 1220 && POINTER_TYPE_P (TREE_TYPE (lhs)) | |
|
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1221 && POINTER_TYPE_P (TREE_TYPE (op0))) |
| 0 | 1222 { |
| 1223 tree tem; | |
|
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1224 /* Try to re-construct array references on-the-fly. */ |
| 0 | 1225 if (!useless_type_conversion_p (TREE_TYPE (lhs), |
| 1226 TREE_TYPE (op0)) | |
| 1227 && ((tem = maybe_fold_offset_to_address | |
|
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1228 (loc, |
|
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1229 op0, integer_zero_node, TREE_TYPE (lhs))) |
| 0 | 1230 != NULL_TREE)) |
| 1231 return tem; | |
| 1232 return op0; | |
| 1233 } | |
| 1234 | |
|
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1235 return |
|
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1236 fold_unary_ignore_overflow_loc (loc, subcode, |
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1237 gimple_expr_type (stmt), op0); |
| 0 | 1238 } |
| 1239 | |
| 1240 case GIMPLE_BINARY_RHS: | |
| 1241 { | |
| 1242 /* Handle binary operators that can appear in GIMPLE form. */ | |
|
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1243 tree op0 = valueize_op (gimple_assign_rhs1 (stmt)); |
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1244 tree op1 = valueize_op (gimple_assign_rhs2 (stmt)); |
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1245 |
|
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1246 /* Translate &x + CST into an invariant form suitable for |
|
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1247 further propagation. */ |
| 0 | 1248 if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR |
| 1249 && TREE_CODE (op0) == ADDR_EXPR | |
| 1250 && TREE_CODE (op1) == INTEGER_CST) | |
| 1251 { | |
|
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1252 tree off = fold_convert (ptr_type_node, op1); |
|
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1253 return build_fold_addr_expr |
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1254 (fold_build2 (MEM_REF, |
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1255 TREE_TYPE (TREE_TYPE (op0)), |
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1256 unshare_expr (op0), off)); |
| 0 | 1257 } |
| 1258 | |
|
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1259 return fold_binary_loc (loc, subcode, |
|
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1260 gimple_expr_type (stmt), op0, op1); |
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1261 } |
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1262 |
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1263 case GIMPLE_TERNARY_RHS: |
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1264 { |
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1265 /* Handle ternary operators that can appear in GIMPLE form. */ |
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1266 tree op0 = valueize_op (gimple_assign_rhs1 (stmt)); |
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1267 tree op1 = valueize_op (gimple_assign_rhs2 (stmt)); |
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1268 tree op2 = valueize_op (gimple_assign_rhs3 (stmt)); |
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1269 |
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1270 return fold_ternary_loc (loc, subcode, |
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1271 gimple_expr_type (stmt), op0, op1, op2); |
| 0 | 1272 } |
| 1273 | |
| 1274 default: | |
| 1275 gcc_unreachable (); | |
| 1276 } | |
| 1277 } | |
| 1278 break; | |
| 1279 | |
| 1280 case GIMPLE_CALL: | |
| 1281 { | |
|
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1282 tree fn = valueize_op (gimple_call_fn (stmt)); |
| 0 | 1283 if (TREE_CODE (fn) == ADDR_EXPR |
| 1284 && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL | |
| 1285 && DECL_BUILT_IN (TREE_OPERAND (fn, 0))) | |
| 1286 { | |
| 1287 tree *args = XALLOCAVEC (tree, gimple_call_num_args (stmt)); | |
| 1288 tree call, retval; | |
| 1289 unsigned i; | |
| 1290 for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
|
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1291 args[i] = valueize_op (gimple_call_arg (stmt, i)); |
|
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1292 call = build_call_array_loc (loc, |
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1293 gimple_call_return_type (stmt), |
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1294 fn, gimple_call_num_args (stmt), args); |
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1295 retval = fold_call_expr (EXPR_LOCATION (call), call, false); |
| 0 | 1296 if (retval) |
| 1297 /* fold_call_expr wraps the result inside a NOP_EXPR. */ | |
| 1298 STRIP_NOPS (retval); | |
| 1299 return retval; | |
| 1300 } | |
| 1301 return NULL_TREE; | |
| 1302 } | |
| 1303 | |
| 1304 case GIMPLE_COND: | |
| 1305 { | |
| 1306 /* Handle comparison operators that can appear in GIMPLE form. */ | |
|
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1307 tree op0 = valueize_op (gimple_cond_lhs (stmt)); |
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1308 tree op1 = valueize_op (gimple_cond_rhs (stmt)); |
| 0 | 1309 enum tree_code code = gimple_cond_code (stmt); |
|
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1310 return fold_binary_loc (loc, code, boolean_type_node, op0, op1); |
| 0 | 1311 } |
| 1312 | |
| 1313 case GIMPLE_SWITCH: | |
| 1314 { | |
|
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1315 /* Return the constant switch index. */ |
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1316 return valueize_op (gimple_switch_index (stmt)); |
| 0 | 1317 } |
| 1318 | |
| 1319 default: | |
| 1320 gcc_unreachable (); | |
| 1321 } | |
| 1322 } | |
| 1323 | |
|
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1324 /* See if we can find constructor defining value of BASE. |
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1325 When we know the consructor with constant offset (such as |
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1326 base is array[40] and we do know constructor of array), then |
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1327 BIT_OFFSET is adjusted accordingly. |
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1328 |
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1329 As a special case, return error_mark_node when constructor |
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1330 is not explicitly available, but it is known to be zero |
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1331 such as 'static const int a;'. */ |
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1332 static tree |
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1333 get_base_constructor (tree base, HOST_WIDE_INT *bit_offset) |
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1334 { |
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1335 HOST_WIDE_INT bit_offset2, size, max_size; |
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1336 if (TREE_CODE (base) == MEM_REF) |
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1337 { |
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1338 if (!integer_zerop (TREE_OPERAND (base, 1))) |
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1339 { |
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1340 if (!host_integerp (TREE_OPERAND (base, 1), 0)) |
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1341 return NULL_TREE; |
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1342 *bit_offset += (mem_ref_offset (base).low |
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1343 * BITS_PER_UNIT); |
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1344 } |
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1345 |
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1346 base = get_constant_value (TREE_OPERAND (base, 0)); |
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1347 if (!base || TREE_CODE (base) != ADDR_EXPR) |
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1348 return NULL_TREE; |
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1349 base = TREE_OPERAND (base, 0); |
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1350 } |
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1351 |
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1352 /* Get a CONSTRUCTOR. If BASE is a VAR_DECL, get its |
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1353 DECL_INITIAL. If BASE is a nested reference into another |
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1354 ARRAY_REF or COMPONENT_REF, make a recursive call to resolve |
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1355 the inner reference. */ |
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1356 switch (TREE_CODE (base)) |
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1357 { |
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1358 case VAR_DECL: |
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1359 if (!const_value_known_p (base)) |
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1360 return NULL_TREE; |
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1361 |
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1362 /* Fallthru. */ |
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1363 case CONST_DECL: |
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1364 if (!DECL_INITIAL (base) |
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1365 && (TREE_STATIC (base) || DECL_EXTERNAL (base))) |
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1366 return error_mark_node; |
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1367 return DECL_INITIAL (base); |
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1368 |
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1369 case ARRAY_REF: |
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1370 case COMPONENT_REF: |
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1371 base = get_ref_base_and_extent (base, &bit_offset2, &size, &max_size); |
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1372 if (max_size == -1 || size != max_size) |
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1373 return NULL_TREE; |
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1374 *bit_offset += bit_offset2; |
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1375 return get_base_constructor (base, bit_offset); |
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1376 |
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1377 case STRING_CST: |
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1378 case CONSTRUCTOR: |
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1379 return base; |
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1380 |
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1381 default: |
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1382 return NULL_TREE; |
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1383 } |
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1384 } |
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1385 |
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1386 /* CTOR is STRING_CST. Fold reference of type TYPE and size SIZE |
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1387 to the memory at bit OFFSET. |
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1388 |
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1389 We do only simple job of folding byte accesses. */ |
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1390 |
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1391 static tree |
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1392 fold_string_cst_ctor_reference (tree type, tree ctor, unsigned HOST_WIDE_INT offset, |
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1393 unsigned HOST_WIDE_INT size) |
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1394 { |
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1395 if (INTEGRAL_TYPE_P (type) |
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1396 && (TYPE_MODE (type) |
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1397 == TYPE_MODE (TREE_TYPE (TREE_TYPE (ctor)))) |
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1398 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_TYPE (ctor)))) |
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1399 == MODE_INT) |
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1400 && GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_TYPE (ctor)))) == 1 |
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1401 && size == BITS_PER_UNIT |
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1402 && !(offset % BITS_PER_UNIT)) |
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1403 { |
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1404 offset /= BITS_PER_UNIT; |
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1405 if (offset < (unsigned HOST_WIDE_INT) TREE_STRING_LENGTH (ctor)) |
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1406 return build_int_cst_type (type, (TREE_STRING_POINTER (ctor) |
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1407 [offset])); |
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1408 /* Folding |
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1409 const char a[20]="hello"; |
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1410 return a[10]; |
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1411 |
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1412 might lead to offset greater than string length. In this case we |
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1413 know value is either initialized to 0 or out of bounds. Return 0 |
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1414 in both cases. */ |
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1415 return build_zero_cst (type); |
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1416 } |
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1417 return NULL_TREE; |
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1418 } |
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1419 |
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1420 /* CTOR is CONSTRUCTOR of an array type. Fold reference of type TYPE and size |
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1421 SIZE to the memory at bit OFFSET. */ |
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1422 |
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1423 static tree |
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1424 fold_array_ctor_reference (tree type, tree ctor, |
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1425 unsigned HOST_WIDE_INT offset, |
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1426 unsigned HOST_WIDE_INT size) |
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1427 { |
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1428 unsigned HOST_WIDE_INT cnt; |
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1429 tree cfield, cval; |
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1430 double_int low_bound, elt_size; |
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1431 double_int index, max_index; |
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1432 double_int access_index; |
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1433 tree domain_type = TYPE_DOMAIN (TREE_TYPE (ctor)); |
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1434 HOST_WIDE_INT inner_offset; |
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1435 |
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1436 /* Compute low bound and elt size. */ |
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1437 if (domain_type && TYPE_MIN_VALUE (domain_type)) |
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1438 { |
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1439 /* Static constructors for variably sized objects makes no sense. */ |
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1440 gcc_assert (TREE_CODE (TYPE_MIN_VALUE (domain_type)) == INTEGER_CST); |
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1441 low_bound = tree_to_double_int (TYPE_MIN_VALUE (domain_type)); |
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1442 } |
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1443 else |
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1444 low_bound = double_int_zero; |
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1445 /* Static constructors for variably sized objects makes no sense. */ |
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1446 gcc_assert (TREE_CODE(TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))) |
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1447 == INTEGER_CST); |
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1448 elt_size = |
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1449 tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))); |
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1450 |
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1451 |
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1452 /* We can handle only constantly sized accesses that are known to not |
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1453 be larger than size of array element. */ |
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1454 if (!TYPE_SIZE_UNIT (type) |
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1455 || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST |
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1456 || double_int_cmp (elt_size, |
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1457 tree_to_double_int (TYPE_SIZE_UNIT (type)), 0) < 0) |
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1458 return NULL_TREE; |
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1459 |
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1460 /* Compute the array index we look for. */ |
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1461 access_index = double_int_udiv (uhwi_to_double_int (offset / BITS_PER_UNIT), |
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1462 elt_size, TRUNC_DIV_EXPR); |
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1463 access_index = double_int_add (access_index, low_bound); |
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1464 |
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1465 /* And offset within the access. */ |
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1466 inner_offset = offset % (double_int_to_uhwi (elt_size) * BITS_PER_UNIT); |
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1467 |
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1468 /* See if the array field is large enough to span whole access. We do not |
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1469 care to fold accesses spanning multiple array indexes. */ |
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1470 if (inner_offset + size > double_int_to_uhwi (elt_size) * BITS_PER_UNIT) |
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1471 return NULL_TREE; |
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1472 |
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1473 index = double_int_sub (low_bound, double_int_one); |
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1474 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, cval) |
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1475 { |
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1476 /* Array constructor might explicitely set index, or specify range |
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1477 or leave index NULL meaning that it is next index after previous |
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1478 one. */ |
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1479 if (cfield) |
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1480 { |
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1481 if (TREE_CODE (cfield) == INTEGER_CST) |
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1482 max_index = index = tree_to_double_int (cfield); |
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1483 else |
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1484 { |
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1485 gcc_assert (TREE_CODE (cfield) == RANGE_EXPR); |
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1486 index = tree_to_double_int (TREE_OPERAND (cfield, 0)); |
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1487 max_index = tree_to_double_int (TREE_OPERAND (cfield, 1)); |
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1488 } |
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1489 } |
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1490 else |
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1491 max_index = index = double_int_add (index, double_int_one); |
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1492 |
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1493 /* Do we have match? */ |
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1494 if (double_int_cmp (access_index, index, 1) >= 0 |
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1495 && double_int_cmp (access_index, max_index, 1) <= 0) |
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1496 return fold_ctor_reference (type, cval, inner_offset, size); |
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1497 } |
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1498 /* When memory is not explicitely mentioned in constructor, |
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1499 it is 0 (or out of range). */ |
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1500 return build_zero_cst (type); |
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1501 } |
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1502 |
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1503 /* CTOR is CONSTRUCTOR of an aggregate or vector. |
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1504 Fold reference of type TYPE and size SIZE to the memory at bit OFFSET. */ |
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1505 |
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1506 static tree |
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1507 fold_nonarray_ctor_reference (tree type, tree ctor, |
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1508 unsigned HOST_WIDE_INT offset, |
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1509 unsigned HOST_WIDE_INT size) |
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1510 { |
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1511 unsigned HOST_WIDE_INT cnt; |
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1512 tree cfield, cval; |
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1513 |
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1514 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, |
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1515 cval) |
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1516 { |
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1517 tree byte_offset = DECL_FIELD_OFFSET (cfield); |
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1518 tree field_offset = DECL_FIELD_BIT_OFFSET (cfield); |
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1519 tree field_size = DECL_SIZE (cfield); |
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1520 double_int bitoffset; |
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1521 double_int byte_offset_cst = tree_to_double_int (byte_offset); |
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1522 double_int bits_per_unit_cst = uhwi_to_double_int (BITS_PER_UNIT); |
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1523 double_int bitoffset_end; |
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1524 |
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1525 /* Variable sized objects in static constructors makes no sense, |
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1526 but field_size can be NULL for flexible array members. */ |
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1527 gcc_assert (TREE_CODE (field_offset) == INTEGER_CST |
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1528 && TREE_CODE (byte_offset) == INTEGER_CST |
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1529 && (field_size != NULL_TREE |
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1530 ? TREE_CODE (field_size) == INTEGER_CST |
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1531 : TREE_CODE (TREE_TYPE (cfield)) == ARRAY_TYPE)); |
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1532 |
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1533 /* Compute bit offset of the field. */ |
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1534 bitoffset = double_int_add (tree_to_double_int (field_offset), |
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1535 double_int_mul (byte_offset_cst, |
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1536 bits_per_unit_cst)); |
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1537 /* Compute bit offset where the field ends. */ |
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1538 if (field_size != NULL_TREE) |
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1539 bitoffset_end = double_int_add (bitoffset, |
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1540 tree_to_double_int (field_size)); |
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1541 else |
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1542 bitoffset_end = double_int_zero; |
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1543 |
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1544 /* Is OFFSET in the range (BITOFFSET, BITOFFSET_END)? */ |
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1545 if (double_int_cmp (uhwi_to_double_int (offset), bitoffset, 0) >= 0 |
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1546 && (field_size == NULL_TREE |
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1547 || double_int_cmp (uhwi_to_double_int (offset), |
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1548 bitoffset_end, 0) < 0)) |
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1549 { |
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1550 double_int access_end = double_int_add (uhwi_to_double_int (offset), |
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1551 uhwi_to_double_int (size)); |
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1552 double_int inner_offset = double_int_sub (uhwi_to_double_int (offset), |
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1553 bitoffset); |
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1554 /* We do have overlap. Now see if field is large enough to |
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1555 cover the access. Give up for accesses spanning multiple |
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1556 fields. */ |
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1557 if (double_int_cmp (access_end, bitoffset_end, 0) > 0) |
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1558 return NULL_TREE; |
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1559 return fold_ctor_reference (type, cval, |
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1560 double_int_to_uhwi (inner_offset), size); |
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1561 } |
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1562 } |
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1563 /* When memory is not explicitely mentioned in constructor, it is 0. */ |
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1564 return build_zero_cst (type); |
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1565 } |
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|
1566 |
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1567 /* CTOR is value initializing memory, fold reference of type TYPE and size SIZE |
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|
1568 to the memory at bit OFFSET. */ |
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1569 |
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|
1570 static tree |
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1571 fold_ctor_reference (tree type, tree ctor, unsigned HOST_WIDE_INT offset, |
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1572 unsigned HOST_WIDE_INT size) |
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1573 { |
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1574 tree ret; |
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1575 |
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1576 /* We found the field with exact match. */ |
|
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1577 if (useless_type_conversion_p (type, TREE_TYPE (ctor)) |
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1578 && !offset) |
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1579 return canonicalize_constructor_val (ctor); |
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|
1580 |
|
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1581 /* We are at the end of walk, see if we can view convert the |
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|
1582 result. */ |
|
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1583 if (!AGGREGATE_TYPE_P (TREE_TYPE (ctor)) && !offset |
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1584 /* VIEW_CONVERT_EXPR is defined only for matching sizes. */ |
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1585 && operand_equal_p (TYPE_SIZE (type), |
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1586 TYPE_SIZE (TREE_TYPE (ctor)), 0)) |
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1587 { |
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1588 ret = canonicalize_constructor_val (ctor); |
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1589 ret = fold_unary (VIEW_CONVERT_EXPR, type, ret); |
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1590 if (ret) |
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|
1591 STRIP_NOPS (ret); |
|
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1592 return ret; |
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1593 } |
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1594 if (TREE_CODE (ctor) == STRING_CST) |
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1595 return fold_string_cst_ctor_reference (type, ctor, offset, size); |
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1596 if (TREE_CODE (ctor) == CONSTRUCTOR) |
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1597 { |
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|
1598 |
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1599 if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE) |
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1600 return fold_array_ctor_reference (type, ctor, offset, size); |
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1601 else |
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1602 return fold_nonarray_ctor_reference (type, ctor, offset, size); |
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1603 } |
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1604 |
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1605 return NULL_TREE; |
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1606 } |
| 0 | 1607 |
| 1608 /* Return the tree representing the element referenced by T if T is an | |
| 1609 ARRAY_REF or COMPONENT_REF into constant aggregates. Return | |
| 1610 NULL_TREE otherwise. */ | |
| 1611 | |
| 1612 tree | |
| 1613 fold_const_aggregate_ref (tree t) | |
| 1614 { | |
|
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|
1615 tree ctor, idx, base; |
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1616 HOST_WIDE_INT offset, size, max_size; |
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1617 tree tem; |
| 0 | 1618 |
|
55
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1619 if (TREE_CODE_CLASS (TREE_CODE (t)) == tcc_declaration) |
|
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1620 return get_symbol_constant_value (t); |
|
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1621 |
|
67
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1622 tem = fold_read_from_constant_string (t); |
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1623 if (tem) |
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1624 return tem; |
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1625 |
| 0 | 1626 switch (TREE_CODE (t)) |
| 1627 { | |
| 1628 case ARRAY_REF: | |
|
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1629 case ARRAY_RANGE_REF: |
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1630 /* Constant indexes are handled well by get_base_constructor. |
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1631 Only special case variable offsets. |
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|
1632 FIXME: This code can't handle nested references with variable indexes |
|
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1633 (they will be handled only by iteration of ccp). Perhaps we can bring |
|
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|
1634 get_ref_base_and_extent here and make it use get_constant_value. */ |
|
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1635 if (TREE_CODE (TREE_OPERAND (t, 1)) == SSA_NAME |
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1636 && (idx = get_constant_value (TREE_OPERAND (t, 1))) |
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1637 && host_integerp (idx, 0)) |
| 0 | 1638 { |
|
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|
1639 tree low_bound, unit_size; |
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|
1640 |
|
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1641 /* If the resulting bit-offset is constant, track it. */ |
|
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1642 if ((low_bound = array_ref_low_bound (t), |
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|
1643 host_integerp (low_bound, 0)) |
|
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1644 && (unit_size = array_ref_element_size (t), |
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|
1645 host_integerp (unit_size, 1))) |
|
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|
1646 { |
|
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1647 offset = TREE_INT_CST_LOW (idx); |
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1648 offset -= TREE_INT_CST_LOW (low_bound); |
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1649 offset *= TREE_INT_CST_LOW (unit_size); |
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|
1650 offset *= BITS_PER_UNIT; |
|
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|
1651 |
|
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|
1652 base = TREE_OPERAND (t, 0); |
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1653 ctor = get_base_constructor (base, &offset); |
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|
1654 /* Empty constructor. Always fold to 0. */ |
|
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|
1655 if (ctor == error_mark_node) |
|
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|
1656 return build_zero_cst (TREE_TYPE (t)); |
|
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|
1657 /* Out of bound array access. Value is undefined, but don't fold. */ |
|
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|
1658 if (offset < 0) |
|
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|
1659 return NULL_TREE; |
|
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|
1660 /* We can not determine ctor. */ |
|
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|
1661 if (!ctor) |
|
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changeset
|
1662 return NULL_TREE; |
|
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1663 return fold_ctor_reference (TREE_TYPE (t), ctor, offset, |
|
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|
1664 TREE_INT_CST_LOW (unit_size) |
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1665 * BITS_PER_UNIT); |
|
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1666 } |
| 0 | 1667 } |
|
67
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|
1668 /* Fallthru. */ |
|
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1669 |
| 0 | 1670 case COMPONENT_REF: |
|
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|
1671 case BIT_FIELD_REF: |
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|
1672 case TARGET_MEM_REF: |
|
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|
1673 case MEM_REF: |
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1674 base = get_ref_base_and_extent (t, &offset, &size, &max_size); |
|
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1675 ctor = get_base_constructor (base, &offset); |
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1676 |
|
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|
1677 /* Empty constructor. Always fold to 0. */ |
|
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|
1678 if (ctor == error_mark_node) |
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1679 return build_zero_cst (TREE_TYPE (t)); |
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|
1680 /* We do not know precise address. */ |
|
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|
1681 if (max_size == -1 || max_size != size) |
| 0 | 1682 return NULL_TREE; |
|
67
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|
1683 /* We can not determine ctor. */ |
|
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1684 if (!ctor) |
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|
1685 return NULL_TREE; |
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1686 |
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1687 /* Out of bound array access. Value is undefined, but don't fold. */ |
|
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1688 if (offset < 0) |
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|
1689 return NULL_TREE; |
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1690 |
|
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|
1691 return fold_ctor_reference (TREE_TYPE (t), ctor, offset, size); |
| 0 | 1692 |
| 1693 case REALPART_EXPR: | |
| 1694 case IMAGPART_EXPR: | |
| 1695 { | |
| 1696 tree c = fold_const_aggregate_ref (TREE_OPERAND (t, 0)); | |
| 1697 if (c && TREE_CODE (c) == COMPLEX_CST) | |
|
55
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|
1698 return fold_build1_loc (EXPR_LOCATION (t), |
|
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|
1699 TREE_CODE (t), TREE_TYPE (t), c); |
| 0 | 1700 break; |
| 1701 } | |
| 1702 | |
| 1703 default: | |
| 1704 break; | |
| 1705 } | |
| 1706 | |
| 1707 return NULL_TREE; | |
| 1708 } | |
| 1709 | |
|
67
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|
1710 /* Apply the operation CODE in type TYPE to the value, mask pair |
|
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|
1711 RVAL and RMASK representing a value of type RTYPE and set |
|
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|
1712 the value, mask pair *VAL and *MASK to the result. */ |
|
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1713 |
|
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|
1714 static void |
|
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|
1715 bit_value_unop_1 (enum tree_code code, tree type, |
|
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|
1716 double_int *val, double_int *mask, |
|
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|
1717 tree rtype, double_int rval, double_int rmask) |
|
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|
1718 { |
|
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|
1719 switch (code) |
|
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|
1720 { |
|
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|
1721 case BIT_NOT_EXPR: |
|
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|
1722 *mask = rmask; |
|
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|
1723 *val = double_int_not (rval); |
|
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|
1724 break; |
|
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|
1725 |
|
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|
1726 case NEGATE_EXPR: |
|
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|
1727 { |
|
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|
1728 double_int temv, temm; |
|
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|
1729 /* Return ~rval + 1. */ |
|
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|
1730 bit_value_unop_1 (BIT_NOT_EXPR, type, &temv, &temm, type, rval, rmask); |
|
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|
1731 bit_value_binop_1 (PLUS_EXPR, type, val, mask, |
|
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|
1732 type, temv, temm, |
|
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|
1733 type, double_int_one, double_int_zero); |
|
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|
1734 break; |
|
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|
1735 } |
|
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|
1736 |
|
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|
1737 CASE_CONVERT: |
|
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|
1738 { |
|
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|
1739 bool uns; |
|
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|
1740 |
|
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|
1741 /* First extend mask and value according to the original type. */ |
|
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|
1742 uns = (TREE_CODE (rtype) == INTEGER_TYPE && TYPE_IS_SIZETYPE (rtype) |
|
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|
1743 ? 0 : TYPE_UNSIGNED (rtype)); |
|
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|
1744 *mask = double_int_ext (rmask, TYPE_PRECISION (rtype), uns); |
|
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|
1745 *val = double_int_ext (rval, TYPE_PRECISION (rtype), uns); |
|
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|
1746 |
|
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|
1747 /* Then extend mask and value according to the target type. */ |
|
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|
1748 uns = (TREE_CODE (type) == INTEGER_TYPE && TYPE_IS_SIZETYPE (type) |
|
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|
1749 ? 0 : TYPE_UNSIGNED (type)); |
|
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|
1750 *mask = double_int_ext (*mask, TYPE_PRECISION (type), uns); |
|
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|
1751 *val = double_int_ext (*val, TYPE_PRECISION (type), uns); |
|
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|
1752 break; |
|
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|
1753 } |
|
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|
1754 |
|
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|
1755 default: |
|
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|
1756 *mask = double_int_minus_one; |
|
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|
1757 break; |
|
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|
1758 } |
|
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|
1759 } |
|
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|
1760 |
|
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changeset
|
1761 /* Apply the operation CODE in type TYPE to the value, mask pairs |
|
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|
1762 R1VAL, R1MASK and R2VAL, R2MASK representing a values of type R1TYPE |
|
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|
1763 and R2TYPE and set the value, mask pair *VAL and *MASK to the result. */ |
|
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|
1764 |
|
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|
1765 static void |
|
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|
1766 bit_value_binop_1 (enum tree_code code, tree type, |
|
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|
1767 double_int *val, double_int *mask, |
|
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|
1768 tree r1type, double_int r1val, double_int r1mask, |
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1769 tree r2type, double_int r2val, double_int r2mask) |
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1770 { |
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1771 bool uns = (TREE_CODE (type) == INTEGER_TYPE |
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1772 && TYPE_IS_SIZETYPE (type) ? 0 : TYPE_UNSIGNED (type)); |
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1773 /* Assume we'll get a constant result. Use an initial varying value, |
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1774 we fall back to varying in the end if necessary. */ |
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1775 *mask = double_int_minus_one; |
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1776 switch (code) |
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1777 { |
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1778 case BIT_AND_EXPR: |
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1779 /* The mask is constant where there is a known not |
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1780 set bit, (m1 | m2) & ((v1 | m1) & (v2 | m2)) */ |
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1781 *mask = double_int_and (double_int_ior (r1mask, r2mask), |
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1782 double_int_and (double_int_ior (r1val, r1mask), |
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1783 double_int_ior (r2val, r2mask))); |
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1784 *val = double_int_and (r1val, r2val); |
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1785 break; |
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1786 |
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1787 case BIT_IOR_EXPR: |
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1788 /* The mask is constant where there is a known |
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1789 set bit, (m1 | m2) & ~((v1 & ~m1) | (v2 & ~m2)). */ |
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1790 *mask = double_int_and_not |
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1791 (double_int_ior (r1mask, r2mask), |
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1792 double_int_ior (double_int_and_not (r1val, r1mask), |
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1793 double_int_and_not (r2val, r2mask))); |
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1794 *val = double_int_ior (r1val, r2val); |
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1795 break; |
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1796 |
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1797 case BIT_XOR_EXPR: |
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1798 /* m1 | m2 */ |
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1799 *mask = double_int_ior (r1mask, r2mask); |
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1800 *val = double_int_xor (r1val, r2val); |
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1801 break; |
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1802 |
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1803 case LROTATE_EXPR: |
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1804 case RROTATE_EXPR: |
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1805 if (double_int_zero_p (r2mask)) |
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1806 { |
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1807 HOST_WIDE_INT shift = r2val.low; |
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1808 if (code == RROTATE_EXPR) |
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1809 shift = -shift; |
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1810 *mask = double_int_lrotate (r1mask, shift, TYPE_PRECISION (type)); |
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1811 *val = double_int_lrotate (r1val, shift, TYPE_PRECISION (type)); |
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1812 } |
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1813 break; |
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1814 |
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1815 case LSHIFT_EXPR: |
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1816 case RSHIFT_EXPR: |
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1817 /* ??? We can handle partially known shift counts if we know |
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1818 its sign. That way we can tell that (x << (y | 8)) & 255 |
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1819 is zero. */ |
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1820 if (double_int_zero_p (r2mask)) |
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1821 { |
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1822 HOST_WIDE_INT shift = r2val.low; |
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1823 if (code == RSHIFT_EXPR) |
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1824 shift = -shift; |
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1825 /* We need to know if we are doing a left or a right shift |
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1826 to properly shift in zeros for left shift and unsigned |
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1827 right shifts and the sign bit for signed right shifts. |
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1828 For signed right shifts we shift in varying in case |
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1829 the sign bit was varying. */ |
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1830 if (shift > 0) |
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1831 { |
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1832 *mask = double_int_lshift (r1mask, shift, |
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1833 TYPE_PRECISION (type), false); |
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1834 *val = double_int_lshift (r1val, shift, |
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1835 TYPE_PRECISION (type), false); |
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1836 } |
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1837 else if (shift < 0) |
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1838 { |
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1839 /* ??? We can have sizetype related inconsistencies in |
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1840 the IL. */ |
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1841 if ((TREE_CODE (r1type) == INTEGER_TYPE |
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1842 && (TYPE_IS_SIZETYPE (r1type) |
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1843 ? 0 : TYPE_UNSIGNED (r1type))) != uns) |
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1844 break; |
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1845 |
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1846 shift = -shift; |
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1847 *mask = double_int_rshift (r1mask, shift, |
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1848 TYPE_PRECISION (type), !uns); |
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1849 *val = double_int_rshift (r1val, shift, |
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1850 TYPE_PRECISION (type), !uns); |
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1851 } |
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1852 else |
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1853 { |
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1854 *mask = r1mask; |
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1855 *val = r1val; |
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1856 } |
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1857 } |
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1858 break; |
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1859 |
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1860 case PLUS_EXPR: |
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1861 case POINTER_PLUS_EXPR: |
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1862 { |
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1863 double_int lo, hi; |
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1864 /* Do the addition with unknown bits set to zero, to give carry-ins of |
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1865 zero wherever possible. */ |
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1866 lo = double_int_add (double_int_and_not (r1val, r1mask), |
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1867 double_int_and_not (r2val, r2mask)); |
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1868 lo = double_int_ext (lo, TYPE_PRECISION (type), uns); |
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1869 /* Do the addition with unknown bits set to one, to give carry-ins of |
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1870 one wherever possible. */ |
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1871 hi = double_int_add (double_int_ior (r1val, r1mask), |
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1872 double_int_ior (r2val, r2mask)); |
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1873 hi = double_int_ext (hi, TYPE_PRECISION (type), uns); |
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1874 /* Each bit in the result is known if (a) the corresponding bits in |
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1875 both inputs are known, and (b) the carry-in to that bit position |
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1876 is known. We can check condition (b) by seeing if we got the same |
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1877 result with minimised carries as with maximised carries. */ |
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1878 *mask = double_int_ior (double_int_ior (r1mask, r2mask), |
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1879 double_int_xor (lo, hi)); |
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1880 *mask = double_int_ext (*mask, TYPE_PRECISION (type), uns); |
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1881 /* It shouldn't matter whether we choose lo or hi here. */ |
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1882 *val = lo; |
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1883 break; |
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1884 } |
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1885 |
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1886 case MINUS_EXPR: |
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1887 { |
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1888 double_int temv, temm; |
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1889 bit_value_unop_1 (NEGATE_EXPR, r2type, &temv, &temm, |
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1890 r2type, r2val, r2mask); |
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1891 bit_value_binop_1 (PLUS_EXPR, type, val, mask, |
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1892 r1type, r1val, r1mask, |
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1893 r2type, temv, temm); |
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1894 break; |
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1895 } |
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1896 |
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1897 case MULT_EXPR: |
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1898 { |
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1899 /* Just track trailing zeros in both operands and transfer |
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1900 them to the other. */ |
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1901 int r1tz = double_int_ctz (double_int_ior (r1val, r1mask)); |
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1902 int r2tz = double_int_ctz (double_int_ior (r2val, r2mask)); |
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1903 if (r1tz + r2tz >= HOST_BITS_PER_DOUBLE_INT) |
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1904 { |
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1905 *mask = double_int_zero; |
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1906 *val = double_int_zero; |
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1907 } |
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1908 else if (r1tz + r2tz > 0) |
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1909 { |
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1910 *mask = double_int_not (double_int_mask (r1tz + r2tz)); |
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1911 *mask = double_int_ext (*mask, TYPE_PRECISION (type), uns); |
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1912 *val = double_int_zero; |
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1913 } |
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1914 break; |
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1915 } |
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1916 |
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1917 case EQ_EXPR: |
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1918 case NE_EXPR: |
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1919 { |
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1920 double_int m = double_int_ior (r1mask, r2mask); |
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1921 if (!double_int_equal_p (double_int_and_not (r1val, m), |
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1922 double_int_and_not (r2val, m))) |
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1923 { |
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1924 *mask = double_int_zero; |
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1925 *val = ((code == EQ_EXPR) ? double_int_zero : double_int_one); |
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1926 } |
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1927 else |
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1928 { |
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1929 /* We know the result of a comparison is always one or zero. */ |
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1930 *mask = double_int_one; |
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1931 *val = double_int_zero; |
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1932 } |
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1933 break; |
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1934 } |
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1935 |
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1936 case GE_EXPR: |
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1937 case GT_EXPR: |
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1938 { |
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1939 double_int tem = r1val; |
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1940 r1val = r2val; |
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1941 r2val = tem; |
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1942 tem = r1mask; |
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1943 r1mask = r2mask; |
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1944 r2mask = tem; |
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1945 code = swap_tree_comparison (code); |
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1946 } |
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1947 /* Fallthru. */ |
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1948 case LT_EXPR: |
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1949 case LE_EXPR: |
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1950 { |
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1951 int minmax, maxmin; |
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1952 /* If the most significant bits are not known we know nothing. */ |
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1953 if (double_int_negative_p (r1mask) || double_int_negative_p (r2mask)) |
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1954 break; |
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1955 |
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1956 /* For comparisons the signedness is in the comparison operands. */ |
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1957 uns = (TREE_CODE (r1type) == INTEGER_TYPE |
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1958 && TYPE_IS_SIZETYPE (r1type) ? 0 : TYPE_UNSIGNED (r1type)); |
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1959 /* ??? We can have sizetype related inconsistencies in the IL. */ |
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1960 if ((TREE_CODE (r2type) == INTEGER_TYPE |
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1961 && TYPE_IS_SIZETYPE (r2type) ? 0 : TYPE_UNSIGNED (r2type)) != uns) |
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1962 break; |
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1963 |
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1964 /* If we know the most significant bits we know the values |
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1965 value ranges by means of treating varying bits as zero |
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1966 or one. Do a cross comparison of the max/min pairs. */ |
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1967 maxmin = double_int_cmp (double_int_ior (r1val, r1mask), |
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1968 double_int_and_not (r2val, r2mask), uns); |
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1969 minmax = double_int_cmp (double_int_and_not (r1val, r1mask), |
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1970 double_int_ior (r2val, r2mask), uns); |
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1971 if (maxmin < 0) /* r1 is less than r2. */ |
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1972 { |
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1973 *mask = double_int_zero; |
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1974 *val = double_int_one; |
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1975 } |
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1976 else if (minmax > 0) /* r1 is not less or equal to r2. */ |
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1977 { |
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1978 *mask = double_int_zero; |
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1979 *val = double_int_zero; |
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1980 } |
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1981 else if (maxmin == minmax) /* r1 and r2 are equal. */ |
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1982 { |
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1983 /* This probably should never happen as we'd have |
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1984 folded the thing during fully constant value folding. */ |
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1985 *mask = double_int_zero; |
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1986 *val = (code == LE_EXPR ? double_int_one : double_int_zero); |
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1987 } |
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1988 else |
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1989 { |
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1990 /* We know the result of a comparison is always one or zero. */ |
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1991 *mask = double_int_one; |
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1992 *val = double_int_zero; |
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1993 } |
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1994 break; |
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1995 } |
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1996 |
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1997 default:; |
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1998 } |
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1999 } |
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2000 |
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2001 /* Return the propagation value when applying the operation CODE to |
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2002 the value RHS yielding type TYPE. */ |
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2003 |
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2004 static prop_value_t |
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2005 bit_value_unop (enum tree_code code, tree type, tree rhs) |
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2006 { |
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2007 prop_value_t rval = get_value_for_expr (rhs, true); |
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2008 double_int value, mask; |
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2009 prop_value_t val; |
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2010 gcc_assert ((rval.lattice_val == CONSTANT |
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2011 && TREE_CODE (rval.value) == INTEGER_CST) |
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2012 || double_int_minus_one_p (rval.mask)); |
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2013 bit_value_unop_1 (code, type, &value, &mask, |
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2014 TREE_TYPE (rhs), value_to_double_int (rval), rval.mask); |
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2015 if (!double_int_minus_one_p (mask)) |
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2016 { |
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2017 val.lattice_val = CONSTANT; |
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2018 val.mask = mask; |
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2019 /* ??? Delay building trees here. */ |
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2020 val.value = double_int_to_tree (type, value); |
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2021 } |
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2022 else |
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2023 { |
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2024 val.lattice_val = VARYING; |
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2025 val.value = NULL_TREE; |
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2026 val.mask = double_int_minus_one; |
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2027 } |
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2028 return val; |
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2029 } |
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2030 |
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2031 /* Return the propagation value when applying the operation CODE to |
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2032 the values RHS1 and RHS2 yielding type TYPE. */ |
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2033 |
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2034 static prop_value_t |
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2035 bit_value_binop (enum tree_code code, tree type, tree rhs1, tree rhs2) |
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2036 { |
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2037 prop_value_t r1val = get_value_for_expr (rhs1, true); |
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2038 prop_value_t r2val = get_value_for_expr (rhs2, true); |
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2039 double_int value, mask; |
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2040 prop_value_t val; |
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2041 gcc_assert ((r1val.lattice_val == CONSTANT |
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2042 && TREE_CODE (r1val.value) == INTEGER_CST) |
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2043 || double_int_minus_one_p (r1val.mask)); |
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2044 gcc_assert ((r2val.lattice_val == CONSTANT |
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2045 && TREE_CODE (r2val.value) == INTEGER_CST) |
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2046 || double_int_minus_one_p (r2val.mask)); |
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2047 bit_value_binop_1 (code, type, &value, &mask, |
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2048 TREE_TYPE (rhs1), value_to_double_int (r1val), r1val.mask, |
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2049 TREE_TYPE (rhs2), value_to_double_int (r2val), r2val.mask); |
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2050 if (!double_int_minus_one_p (mask)) |
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2051 { |
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2052 val.lattice_val = CONSTANT; |
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2053 val.mask = mask; |
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2054 /* ??? Delay building trees here. */ |
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2055 val.value = double_int_to_tree (type, value); |
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2056 } |
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2057 else |
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2058 { |
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2059 val.lattice_val = VARYING; |
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2060 val.value = NULL_TREE; |
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2061 val.mask = double_int_minus_one; |
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2062 } |
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2063 return val; |
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2064 } |
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2065 |
| 0 | 2066 /* Evaluate statement STMT. |
| 2067 Valid only for assignments, calls, conditionals, and switches. */ | |
| 2068 | |
| 2069 static prop_value_t | |
| 2070 evaluate_stmt (gimple stmt) | |
| 2071 { | |
| 2072 prop_value_t val; | |
| 2073 tree simplified = NULL_TREE; | |
| 2074 ccp_lattice_t likelyvalue = likely_value (stmt); | |
|
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2075 bool is_constant = false; |
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2076 |
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2077 if (dump_file && (dump_flags & TDF_DETAILS)) |
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2078 { |
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2079 fprintf (dump_file, "which is likely "); |
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2080 switch (likelyvalue) |
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2081 { |
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2082 case CONSTANT: |
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2083 fprintf (dump_file, "CONSTANT"); |
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2084 break; |
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2085 case UNDEFINED: |
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2086 fprintf (dump_file, "UNDEFINED"); |
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2087 break; |
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2088 case VARYING: |
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2089 fprintf (dump_file, "VARYING"); |
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2090 break; |
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2091 default:; |
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2092 } |
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2093 fprintf (dump_file, "\n"); |
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2094 } |
| 0 | 2095 |
| 2096 /* If the statement is likely to have a CONSTANT result, then try | |
| 2097 to fold the statement to determine the constant value. */ | |
| 2098 /* FIXME. This is the only place that we call ccp_fold. | |
| 2099 Since likely_value never returns CONSTANT for calls, we will | |
| 2100 not attempt to fold them, including builtins that may profit. */ | |
| 2101 if (likelyvalue == CONSTANT) | |
|
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2102 { |
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2103 fold_defer_overflow_warnings (); |
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2104 simplified = ccp_fold (stmt); |
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2105 is_constant = simplified && is_gimple_min_invariant (simplified); |
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2106 fold_undefer_overflow_warnings (is_constant, stmt, 0); |
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2107 if (is_constant) |
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2108 { |
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2109 /* The statement produced a constant value. */ |
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2110 val.lattice_val = CONSTANT; |
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2111 val.value = simplified; |
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2112 val.mask = double_int_zero; |
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2113 } |
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2114 } |
| 0 | 2115 /* If the statement is likely to have a VARYING result, then do not |
| 2116 bother folding the statement. */ | |
| 2117 else if (likelyvalue == VARYING) | |
| 2118 { | |
| 2119 enum gimple_code code = gimple_code (stmt); | |
| 2120 if (code == GIMPLE_ASSIGN) | |
| 2121 { | |
| 2122 enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
|
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2123 |
| 0 | 2124 /* Other cases cannot satisfy is_gimple_min_invariant |
| 2125 without folding. */ | |
| 2126 if (get_gimple_rhs_class (subcode) == GIMPLE_SINGLE_RHS) | |
| 2127 simplified = gimple_assign_rhs1 (stmt); | |
| 2128 } | |
| 2129 else if (code == GIMPLE_SWITCH) | |
| 2130 simplified = gimple_switch_index (stmt); | |
| 2131 else | |
|
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2132 /* These cannot satisfy is_gimple_min_invariant without folding. */ |
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2133 gcc_assert (code == GIMPLE_CALL || code == GIMPLE_COND); |
|
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2134 is_constant = simplified && is_gimple_min_invariant (simplified); |
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2135 if (is_constant) |
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2136 { |
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2137 /* The statement produced a constant value. */ |
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2138 val.lattice_val = CONSTANT; |
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2139 val.value = simplified; |
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2140 val.mask = double_int_zero; |
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2141 } |
| 0 | 2142 } |
| 2143 | |
|
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2144 /* Resort to simplification for bitwise tracking. */ |
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|
2145 if (flag_tree_bit_ccp |
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2146 && likelyvalue == CONSTANT |
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2147 && !is_constant) |
| 0 | 2148 { |
|
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2149 enum gimple_code code = gimple_code (stmt); |
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|
2150 tree fndecl; |
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2151 val.lattice_val = VARYING; |
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2152 val.value = NULL_TREE; |
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2153 val.mask = double_int_minus_one; |
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2154 if (code == GIMPLE_ASSIGN) |
| 0 | 2155 { |
|
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2156 enum tree_code subcode = gimple_assign_rhs_code (stmt); |
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|
2157 tree rhs1 = gimple_assign_rhs1 (stmt); |
|
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|
2158 switch (get_gimple_rhs_class (subcode)) |
|
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changeset
|
2159 { |
|
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diff
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|
2160 case GIMPLE_SINGLE_RHS: |
|
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|
2161 if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1)) |
|
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|
2162 || POINTER_TYPE_P (TREE_TYPE (rhs1))) |
|
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diff
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|
2163 val = get_value_for_expr (rhs1, true); |
|
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|
2164 break; |
|
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|
2165 |
|
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diff
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|
2166 case GIMPLE_UNARY_RHS: |
|
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|
2167 if ((INTEGRAL_TYPE_P (TREE_TYPE (rhs1)) |
|
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|
2168 || POINTER_TYPE_P (TREE_TYPE (rhs1))) |
|
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|
2169 && (INTEGRAL_TYPE_P (gimple_expr_type (stmt)) |
|
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|
2170 || POINTER_TYPE_P (gimple_expr_type (stmt)))) |
|
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|
2171 val = bit_value_unop (subcode, gimple_expr_type (stmt), rhs1); |
|
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changeset
|
2172 break; |
|
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diff
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|
2173 |
|
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|
2174 case GIMPLE_BINARY_RHS: |
|
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|
2175 if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1)) |
|
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|
2176 || POINTER_TYPE_P (TREE_TYPE (rhs1))) |
|
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changeset
|
2177 { |
|
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|
2178 tree lhs = gimple_assign_lhs (stmt); |
|
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|
2179 tree rhs2 = gimple_assign_rhs2 (stmt); |
|
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changeset
|
2180 val = bit_value_binop (subcode, |
|
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|
2181 TREE_TYPE (lhs), rhs1, rhs2); |
|
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|
2182 } |
|
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changeset
|
2183 break; |
|
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parents:
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changeset
|
2184 |
|
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changeset
|
2185 default:; |
|
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diff
changeset
|
2186 } |
| 0 | 2187 } |
|
67
f6334be47118
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changeset
|
2188 else if (code == GIMPLE_COND) |
|
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parents:
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changeset
|
2189 { |
|
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changeset
|
2190 enum tree_code code = gimple_cond_code (stmt); |
|
f6334be47118
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diff
changeset
|
2191 tree rhs1 = gimple_cond_lhs (stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
2192 tree rhs2 = gimple_cond_rhs (stmt); |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
2193 if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1)) |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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|
2194 || POINTER_TYPE_P (TREE_TYPE (rhs1))) |
|
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|
2195 val = bit_value_binop (code, TREE_TYPE (rhs1), rhs1, rhs2); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
2196 } |
|
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parents:
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diff
changeset
|
2197 else if (code == GIMPLE_CALL |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
2198 && (fndecl = gimple_call_fndecl (stmt)) |
|
f6334be47118
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diff
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|
2199 && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) |
|
f6334be47118
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diff
changeset
|
2200 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
2201 switch (DECL_FUNCTION_CODE (fndecl)) |
|
f6334be47118
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parents:
63
diff
changeset
|
2202 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
2203 case BUILT_IN_MALLOC: |
|
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diff
changeset
|
2204 case BUILT_IN_REALLOC: |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2205 case BUILT_IN_CALLOC: |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
2206 val.lattice_val = CONSTANT; |
|
f6334be47118
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diff
changeset
|
2207 val.value = build_int_cst (TREE_TYPE (gimple_get_lhs (stmt)), 0); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2208 val.mask = shwi_to_double_int |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2209 (~(((HOST_WIDE_INT) MALLOC_ABI_ALIGNMENT) |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2210 / BITS_PER_UNIT - 1)); |
|
f6334be47118
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diff
changeset
|
2211 break; |
|
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diff
changeset
|
2212 |
|
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parents:
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diff
changeset
|
2213 case BUILT_IN_ALLOCA: |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
2214 val.lattice_val = CONSTANT; |
|
f6334be47118
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diff
changeset
|
2215 val.value = build_int_cst (TREE_TYPE (gimple_get_lhs (stmt)), 0); |
|
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diff
changeset
|
2216 val.mask = shwi_to_double_int |
|
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diff
changeset
|
2217 (~(((HOST_WIDE_INT) BIGGEST_ALIGNMENT) |
|
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diff
changeset
|
2218 / BITS_PER_UNIT - 1)); |
|
f6334be47118
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diff
changeset
|
2219 break; |
|
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diff
changeset
|
2220 |
|
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diff
changeset
|
2221 default:; |
|
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diff
changeset
|
2222 } |
|
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diff
changeset
|
2223 } |
|
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diff
changeset
|
2224 is_constant = (val.lattice_val == CONSTANT); |
| 0 | 2225 } |
| 2226 | |
|
67
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diff
changeset
|
2227 if (!is_constant) |
| 0 | 2228 { |
| 2229 /* The statement produced a nonconstant value. If the statement | |
| 2230 had UNDEFINED operands, then the result of the statement | |
| 2231 should be UNDEFINED. Otherwise, the statement is VARYING. */ | |
| 2232 if (likelyvalue == UNDEFINED) | |
|
67
f6334be47118
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diff
changeset
|
2233 { |
|
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diff
changeset
|
2234 val.lattice_val = likelyvalue; |
|
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diff
changeset
|
2235 val.mask = double_int_zero; |
|
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diff
changeset
|
2236 } |
| 0 | 2237 else |
|
67
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diff
changeset
|
2238 { |
|
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diff
changeset
|
2239 val.lattice_val = VARYING; |
|
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diff
changeset
|
2240 val.mask = double_int_minus_one; |
|
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diff
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|
2241 } |
| 0 | 2242 |
| 2243 val.value = NULL_TREE; | |
| 2244 } | |
| 2245 | |
| 2246 return val; | |
| 2247 } | |
| 2248 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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47
diff
changeset
|
2249 /* Fold the stmt at *GSI with CCP specific information that propagating |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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diff
changeset
|
2250 and regular folding does not catch. */ |
|
77e2b8dfacca
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47
diff
changeset
|
2251 |
|
77e2b8dfacca
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diff
changeset
|
2252 static bool |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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47
diff
changeset
|
2253 ccp_fold_stmt (gimple_stmt_iterator *gsi) |
|
77e2b8dfacca
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47
diff
changeset
|
2254 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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47
diff
changeset
|
2255 gimple stmt = gsi_stmt (*gsi); |
|
63
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55
diff
changeset
|
2256 |
|
b7f97abdc517
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diff
changeset
|
2257 switch (gimple_code (stmt)) |
|
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diff
changeset
|
2258 { |
|
b7f97abdc517
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55
diff
changeset
|
2259 case GIMPLE_COND: |
|
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55
diff
changeset
|
2260 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2261 prop_value_t val; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2262 /* Statement evaluation will handle type mismatches in constants |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2263 more gracefully than the final propagation. This allows us to |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2264 fold more conditionals here. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2265 val = evaluate_stmt (stmt); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2266 if (val.lattice_val != CONSTANT |
|
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
|
2267 || !double_int_zero_p (val.mask)) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2268 return false; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2269 |
|
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
|
2270 if (dump_file) |
|
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
|
2271 { |
|
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
|
2272 fprintf (dump_file, "Folding 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
|
2273 print_gimple_expr (dump_file, stmt, 0, 0); |
|
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
|
2274 fprintf (dump_file, " to "); |
|
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
|
2275 print_generic_expr (dump_file, val.value, 0); |
|
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
|
2276 fprintf (dump_file, "\n"); |
|
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
|
2277 } |
|
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
|
2278 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2279 if (integer_zerop (val.value)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2280 gimple_cond_make_false (stmt); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2281 else |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2282 gimple_cond_make_true (stmt); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2283 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2284 return true; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2285 } |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
2286 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2287 case GIMPLE_CALL: |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2288 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2289 tree lhs = gimple_call_lhs (stmt); |
|
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
|
2290 tree val; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2291 tree argt; |
|
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
|
2292 tree callee; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2293 bool changed = false; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2294 unsigned i; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2295 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2296 /* If the call was folded into a constant make sure it goes |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2297 away even if we cannot propagate into all uses because of |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2298 type issues. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2299 if (lhs |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2300 && TREE_CODE (lhs) == SSA_NAME |
|
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
|
2301 && (val = get_constant_value (lhs))) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2302 { |
|
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
|
2303 tree new_rhs = unshare_expr (val); |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2304 bool res; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2305 if (!useless_type_conversion_p (TREE_TYPE (lhs), |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2306 TREE_TYPE (new_rhs))) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2307 new_rhs = fold_convert (TREE_TYPE (lhs), new_rhs); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2308 res = update_call_from_tree (gsi, new_rhs); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2309 gcc_assert (res); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2310 return true; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2311 } |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
2312 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2313 /* Propagate into the call arguments. Compared to replace_uses_in |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2314 this can use the argument slot types for type verification |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2315 instead of the current argument type. We also can safely |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2316 drop qualifiers here as we are dealing with constants anyway. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2317 argt = TYPE_ARG_TYPES (TREE_TYPE (TREE_TYPE (gimple_call_fn (stmt)))); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2318 for (i = 0; i < gimple_call_num_args (stmt) && argt; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2319 ++i, argt = TREE_CHAIN (argt)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2320 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2321 tree arg = gimple_call_arg (stmt, i); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2322 if (TREE_CODE (arg) == SSA_NAME |
|
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
|
2323 && (val = get_constant_value (arg)) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2324 && useless_type_conversion_p |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2325 (TYPE_MAIN_VARIANT (TREE_VALUE (argt)), |
|
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
|
2326 TYPE_MAIN_VARIANT (TREE_TYPE (val)))) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2327 { |
|
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
|
2328 gimple_call_set_arg (stmt, i, unshare_expr (val)); |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2329 changed = true; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2330 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2331 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2332 |
|
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
|
2333 callee = gimple_call_fn (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
|
2334 if (TREE_CODE (callee) == OBJ_TYPE_REF |
|
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
|
2335 && TREE_CODE (OBJ_TYPE_REF_EXPR (callee)) == SSA_NAME) |
|
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
|
2336 { |
|
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
|
2337 tree expr = OBJ_TYPE_REF_EXPR (callee); |
|
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
|
2338 OBJ_TYPE_REF_EXPR (callee) = valueize_op (expr); |
|
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
|
2339 if (gimple_fold_call (gsi, false)) |
|
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
|
2340 changed = 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
|
2341 OBJ_TYPE_REF_EXPR (callee) = expr; |
|
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
|
2342 } |
|
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
|
2343 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2344 return changed; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2345 } |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
2346 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2347 case GIMPLE_ASSIGN: |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2348 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2349 tree lhs = gimple_assign_lhs (stmt); |
|
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
|
2350 tree val; |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
2351 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2352 /* If we have a load that turned out to be constant replace it |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2353 as we cannot propagate into all uses in all cases. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2354 if (gimple_assign_single_p (stmt) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2355 && TREE_CODE (lhs) == SSA_NAME |
|
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
|
2356 && (val = get_constant_value (lhs))) |
|
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|
2357 { |
|
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|
2358 tree rhs = unshare_expr (val); |
|
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|
2359 if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (rhs))) |
|
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|
2360 rhs = fold_build1 (VIEW_CONVERT_EXPR, TREE_TYPE (lhs), rhs); |
|
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|
2361 gimple_assign_set_rhs_from_tree (gsi, rhs); |
|
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|
2362 return true; |
|
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|
2363 } |
|
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|
2364 |
|
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|
2365 return false; |
|
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|
2366 } |
|
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|
2367 |
|
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|
2368 default: |
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|
2369 return false; |
|
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|
2370 } |
|
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2371 } |
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|
2372 |
| 0 | 2373 /* Visit the assignment statement STMT. Set the value of its LHS to the |
| 2374 value computed by the RHS and store LHS in *OUTPUT_P. If STMT | |
| 2375 creates virtual definitions, set the value of each new name to that | |
| 2376 of the RHS (if we can derive a constant out of the RHS). | |
| 2377 Value-returning call statements also perform an assignment, and | |
| 2378 are handled here. */ | |
| 2379 | |
| 2380 static enum ssa_prop_result | |
| 2381 visit_assignment (gimple stmt, tree *output_p) | |
| 2382 { | |
| 2383 prop_value_t val; | |
| 2384 enum ssa_prop_result retval; | |
| 2385 | |
| 2386 tree lhs = gimple_get_lhs (stmt); | |
| 2387 | |
| 2388 gcc_assert (gimple_code (stmt) != GIMPLE_CALL | |
| 2389 || gimple_call_lhs (stmt) != NULL_TREE); | |
| 2390 | |
|
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|
2391 if (gimple_assign_single_p (stmt) |
|
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|
2392 && gimple_assign_rhs_code (stmt) == SSA_NAME) |
|
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|
2393 /* For a simple copy operation, we copy the lattice values. */ |
|
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|
2394 val = *get_value (gimple_assign_rhs1 (stmt)); |
| 0 | 2395 else |
| 2396 /* Evaluate the statement, which could be | |
| 2397 either a GIMPLE_ASSIGN or a GIMPLE_CALL. */ | |
| 2398 val = evaluate_stmt (stmt); | |
| 2399 | |
| 2400 retval = SSA_PROP_NOT_INTERESTING; | |
| 2401 | |
| 2402 /* Set the lattice value of the statement's output. */ | |
| 2403 if (TREE_CODE (lhs) == SSA_NAME) | |
| 2404 { | |
| 2405 /* If STMT is an assignment to an SSA_NAME, we only have one | |
| 2406 value to set. */ | |
| 2407 if (set_lattice_value (lhs, val)) | |
| 2408 { | |
| 2409 *output_p = lhs; | |
| 2410 if (val.lattice_val == VARYING) | |
| 2411 retval = SSA_PROP_VARYING; | |
| 2412 else | |
| 2413 retval = SSA_PROP_INTERESTING; | |
| 2414 } | |
| 2415 } | |
| 2416 | |
| 2417 return retval; | |
| 2418 } | |
| 2419 | |
| 2420 | |
| 2421 /* Visit the conditional statement STMT. Return SSA_PROP_INTERESTING | |
| 2422 if it can determine which edge will be taken. Otherwise, return | |
| 2423 SSA_PROP_VARYING. */ | |
| 2424 | |
| 2425 static enum ssa_prop_result | |
| 2426 visit_cond_stmt (gimple stmt, edge *taken_edge_p) | |
| 2427 { | |
| 2428 prop_value_t val; | |
| 2429 basic_block block; | |
| 2430 | |
| 2431 block = gimple_bb (stmt); | |
| 2432 val = evaluate_stmt (stmt); | |
|
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|
2433 if (val.lattice_val != CONSTANT |
|
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|
2434 || !double_int_zero_p (val.mask)) |
|
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|
2435 return SSA_PROP_VARYING; |
| 0 | 2436 |
| 2437 /* Find which edge out of the conditional block will be taken and add it | |
| 2438 to the worklist. If no single edge can be determined statically, | |
| 2439 return SSA_PROP_VARYING to feed all the outgoing edges to the | |
| 2440 propagation engine. */ | |
|
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|
2441 *taken_edge_p = find_taken_edge (block, val.value); |
| 0 | 2442 if (*taken_edge_p) |
| 2443 return SSA_PROP_INTERESTING; | |
| 2444 else | |
| 2445 return SSA_PROP_VARYING; | |
| 2446 } | |
| 2447 | |
| 2448 | |
| 2449 /* Evaluate statement STMT. If the statement produces an output value and | |
| 2450 its evaluation changes the lattice value of its output, return | |
| 2451 SSA_PROP_INTERESTING and set *OUTPUT_P to the SSA_NAME holding the | |
| 2452 output value. | |
|
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|
2453 |
| 0 | 2454 If STMT is a conditional branch and we can determine its truth |
| 2455 value, set *TAKEN_EDGE_P accordingly. If STMT produces a varying | |
| 2456 value, return SSA_PROP_VARYING. */ | |
| 2457 | |
| 2458 static enum ssa_prop_result | |
| 2459 ccp_visit_stmt (gimple stmt, edge *taken_edge_p, tree *output_p) | |
| 2460 { | |
| 2461 tree def; | |
| 2462 ssa_op_iter iter; | |
| 2463 | |
| 2464 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 2465 { | |
| 2466 fprintf (dump_file, "\nVisiting statement:\n"); | |
| 2467 print_gimple_stmt (dump_file, stmt, 0, dump_flags); | |
| 2468 } | |
| 2469 | |
| 2470 switch (gimple_code (stmt)) | |
| 2471 { | |
| 2472 case GIMPLE_ASSIGN: | |
| 2473 /* If the statement is an assignment that produces a single | |
| 2474 output value, evaluate its RHS to see if the lattice value of | |
| 2475 its output has changed. */ | |
| 2476 return visit_assignment (stmt, output_p); | |
| 2477 | |
| 2478 case GIMPLE_CALL: | |
| 2479 /* A value-returning call also performs an assignment. */ | |
| 2480 if (gimple_call_lhs (stmt) != NULL_TREE) | |
| 2481 return visit_assignment (stmt, output_p); | |
| 2482 break; | |
| 2483 | |
| 2484 case GIMPLE_COND: | |
| 2485 case GIMPLE_SWITCH: | |
| 2486 /* If STMT is a conditional branch, see if we can determine | |
| 2487 which branch will be taken. */ | |
| 2488 /* FIXME. It appears that we should be able to optimize | |
| 2489 computed GOTOs here as well. */ | |
| 2490 return visit_cond_stmt (stmt, taken_edge_p); | |
| 2491 | |
| 2492 default: | |
| 2493 break; | |
| 2494 } | |
| 2495 | |
| 2496 /* Any other kind of statement is not interesting for constant | |
| 2497 propagation and, therefore, not worth simulating. */ | |
| 2498 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 2499 fprintf (dump_file, "No interesting values produced. Marked VARYING.\n"); | |
| 2500 | |
| 2501 /* Definitions made by statements other than assignments to | |
| 2502 SSA_NAMEs represent unknown modifications to their outputs. | |
| 2503 Mark them VARYING. */ | |
| 2504 FOR_EACH_SSA_TREE_OPERAND (def, stmt, iter, SSA_OP_ALL_DEFS) | |
| 2505 { | |
|
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diff
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|
2506 prop_value_t v = { VARYING, NULL_TREE, { -1, (HOST_WIDE_INT) -1 } }; |
| 0 | 2507 set_lattice_value (def, v); |
| 2508 } | |
| 2509 | |
| 2510 return SSA_PROP_VARYING; | |
| 2511 } | |
| 2512 | |
| 2513 | |
| 2514 /* Main entry point for SSA Conditional Constant Propagation. */ | |
| 2515 | |
| 2516 static unsigned int | |
| 2517 do_ssa_ccp (void) | |
| 2518 { | |
| 2519 ccp_initialize (); | |
| 2520 ssa_propagate (ccp_visit_stmt, ccp_visit_phi_node); | |
| 2521 if (ccp_finalize ()) | |
| 2522 return (TODO_cleanup_cfg | TODO_update_ssa | TODO_remove_unused_locals); | |
| 2523 else | |
| 2524 return 0; | |
| 2525 } | |
| 2526 | |
| 2527 | |
| 2528 static bool | |
| 2529 gate_ccp (void) | |
| 2530 { | |
| 2531 return flag_tree_ccp != 0; | |
| 2532 } | |
| 2533 | |
| 2534 | |
|
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|
2535 struct gimple_opt_pass pass_ccp = |
| 0 | 2536 { |
| 2537 { | |
| 2538 GIMPLE_PASS, | |
| 2539 "ccp", /* name */ | |
| 2540 gate_ccp, /* gate */ | |
| 2541 do_ssa_ccp, /* execute */ | |
| 2542 NULL, /* sub */ | |
| 2543 NULL, /* next */ | |
| 2544 0, /* static_pass_number */ | |
| 2545 TV_TREE_CCP, /* tv_id */ | |
| 2546 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 2547 0, /* properties_provided */ | |
| 2548 0, /* properties_destroyed */ | |
| 2549 0, /* todo_flags_start */ | |
| 2550 TODO_dump_func | TODO_verify_ssa | |
| 2551 | TODO_verify_stmts | TODO_ggc_collect/* todo_flags_finish */ | |
| 2552 } | |
| 2553 }; | |
| 2554 | |
| 2555 | |
| 2556 | |
| 2557 /* Try to optimize out __builtin_stack_restore. Optimize it out | |
| 2558 if there is another __builtin_stack_restore in the same basic | |
| 2559 block and no calls or ASM_EXPRs are in between, or if this block's | |
| 2560 only outgoing edge is to EXIT_BLOCK and there are no calls or | |
| 2561 ASM_EXPRs after this __builtin_stack_restore. */ | |
| 2562 | |
| 2563 static tree | |
| 2564 optimize_stack_restore (gimple_stmt_iterator i) | |
| 2565 { | |
|
55
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diff
changeset
|
2566 tree callee; |
|
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|
2567 gimple stmt; |
| 0 | 2568 |
| 2569 basic_block bb = gsi_bb (i); | |
| 2570 gimple call = gsi_stmt (i); | |
| 2571 | |
| 2572 if (gimple_code (call) != GIMPLE_CALL | |
| 2573 || gimple_call_num_args (call) != 1 | |
| 2574 || TREE_CODE (gimple_call_arg (call, 0)) != SSA_NAME | |
| 2575 || !POINTER_TYPE_P (TREE_TYPE (gimple_call_arg (call, 0)))) | |
| 2576 return NULL_TREE; | |
| 2577 | |
| 2578 for (gsi_next (&i); !gsi_end_p (i); gsi_next (&i)) | |
| 2579 { | |
| 2580 stmt = gsi_stmt (i); | |
| 2581 if (gimple_code (stmt) == GIMPLE_ASM) | |
| 2582 return NULL_TREE; | |
| 2583 if (gimple_code (stmt) != GIMPLE_CALL) | |
| 2584 continue; | |
| 2585 | |
| 2586 callee = gimple_call_fndecl (stmt); | |
|
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diff
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|
2587 if (!callee |
|
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|
2588 || DECL_BUILT_IN_CLASS (callee) != BUILT_IN_NORMAL |
|
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diff
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|
2589 /* All regular builtins are ok, just obviously not alloca. */ |
|
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|
2590 || DECL_FUNCTION_CODE (callee) == BUILT_IN_ALLOCA) |
| 0 | 2591 return NULL_TREE; |
| 2592 | |
| 2593 if (DECL_FUNCTION_CODE (callee) == BUILT_IN_STACK_RESTORE) | |
|
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diff
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|
2594 goto second_stack_restore; |
| 0 | 2595 } |
| 2596 | |
|
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|
2597 if (!gsi_end_p (i)) |
| 0 | 2598 return NULL_TREE; |
| 2599 | |
|
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diff
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|
2600 /* Allow one successor of the exit block, or zero successors. */ |
|
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diff
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|
2601 switch (EDGE_COUNT (bb->succs)) |
| 0 | 2602 { |
|
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diff
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|
2603 case 0: |
|
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diff
changeset
|
2604 break; |
|
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diff
changeset
|
2605 case 1: |
|
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|
2606 if (single_succ_edge (bb)->dest != EXIT_BLOCK_PTR) |
|
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|
2607 return NULL_TREE; |
|
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changeset
|
2608 break; |
|
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diff
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|
2609 default: |
| 0 | 2610 return NULL_TREE; |
| 2611 } | |
|
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diff
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|
2612 second_stack_restore: |
|
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|
2613 |
|
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diff
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|
2614 /* If there's exactly one use, then zap the call to __builtin_stack_save. |
|
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diff
changeset
|
2615 If there are multiple uses, then the last one should remove the call. |
|
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diff
changeset
|
2616 In any case, whether the call to __builtin_stack_save can be removed |
|
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diff
changeset
|
2617 or not is irrelevant to removing the call to __builtin_stack_restore. */ |
|
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diff
changeset
|
2618 if (has_single_use (gimple_call_arg (call, 0))) |
|
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diff
changeset
|
2619 { |
|
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diff
changeset
|
2620 gimple stack_save = SSA_NAME_DEF_STMT (gimple_call_arg (call, 0)); |
|
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diff
changeset
|
2621 if (is_gimple_call (stack_save)) |
|
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diff
changeset
|
2622 { |
|
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diff
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|
2623 callee = gimple_call_fndecl (stack_save); |
|
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diff
changeset
|
2624 if (callee |
|
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|
2625 && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL |
|
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diff
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|
2626 && DECL_FUNCTION_CODE (callee) == BUILT_IN_STACK_SAVE) |
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2627 { |
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2628 gimple_stmt_iterator stack_save_gsi; |
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2629 tree rhs; |
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2630 |
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2631 stack_save_gsi = gsi_for_stmt (stack_save); |
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2632 rhs = build_int_cst (TREE_TYPE (gimple_call_arg (call, 0)), 0); |
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2633 update_call_from_tree (&stack_save_gsi, rhs); |
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2634 } |
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2635 } |
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2636 } |
| 0 | 2637 |
| 2638 /* No effect, so the statement will be deleted. */ | |
| 2639 return integer_zero_node; | |
| 2640 } | |
| 2641 | |
| 2642 /* If va_list type is a simple pointer and nothing special is needed, | |
| 2643 optimize __builtin_va_start (&ap, 0) into ap = __builtin_next_arg (0), | |
| 2644 __builtin_va_end (&ap) out as NOP and __builtin_va_copy into a simple | |
| 2645 pointer assignment. */ | |
| 2646 | |
| 2647 static tree | |
| 2648 optimize_stdarg_builtin (gimple call) | |
| 2649 { | |
| 2650 tree callee, lhs, rhs, cfun_va_list; | |
| 2651 bool va_list_simple_ptr; | |
|
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2652 location_t loc = gimple_location (call); |
| 0 | 2653 |
| 2654 if (gimple_code (call) != GIMPLE_CALL) | |
| 2655 return NULL_TREE; | |
| 2656 | |
| 2657 callee = gimple_call_fndecl (call); | |
| 2658 | |
| 2659 cfun_va_list = targetm.fn_abi_va_list (callee); | |
| 2660 va_list_simple_ptr = POINTER_TYPE_P (cfun_va_list) | |
| 2661 && (TREE_TYPE (cfun_va_list) == void_type_node | |
| 2662 || TREE_TYPE (cfun_va_list) == char_type_node); | |
| 2663 | |
| 2664 switch (DECL_FUNCTION_CODE (callee)) | |
| 2665 { | |
| 2666 case BUILT_IN_VA_START: | |
| 2667 if (!va_list_simple_ptr | |
| 2668 || targetm.expand_builtin_va_start != NULL | |
| 2669 || built_in_decls[BUILT_IN_NEXT_ARG] == NULL) | |
| 2670 return NULL_TREE; | |
| 2671 | |
| 2672 if (gimple_call_num_args (call) != 2) | |
| 2673 return NULL_TREE; | |
| 2674 | |
| 2675 lhs = gimple_call_arg (call, 0); | |
| 2676 if (!POINTER_TYPE_P (TREE_TYPE (lhs)) | |
| 2677 || TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (lhs))) | |
| 2678 != TYPE_MAIN_VARIANT (cfun_va_list)) | |
| 2679 return NULL_TREE; | |
|
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2680 |
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2681 lhs = build_fold_indirect_ref_loc (loc, lhs); |
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2682 rhs = build_call_expr_loc (loc, built_in_decls[BUILT_IN_NEXT_ARG], |
| 0 | 2683 1, integer_zero_node); |
|
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2684 rhs = fold_convert_loc (loc, TREE_TYPE (lhs), rhs); |
| 0 | 2685 return build2 (MODIFY_EXPR, TREE_TYPE (lhs), lhs, rhs); |
| 2686 | |
| 2687 case BUILT_IN_VA_COPY: | |
| 2688 if (!va_list_simple_ptr) | |
| 2689 return NULL_TREE; | |
| 2690 | |
| 2691 if (gimple_call_num_args (call) != 2) | |
| 2692 return NULL_TREE; | |
| 2693 | |
| 2694 lhs = gimple_call_arg (call, 0); | |
| 2695 if (!POINTER_TYPE_P (TREE_TYPE (lhs)) | |
| 2696 || TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (lhs))) | |
| 2697 != TYPE_MAIN_VARIANT (cfun_va_list)) | |
| 2698 return NULL_TREE; | |
| 2699 | |
|
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2700 lhs = build_fold_indirect_ref_loc (loc, lhs); |
| 0 | 2701 rhs = gimple_call_arg (call, 1); |
| 2702 if (TYPE_MAIN_VARIANT (TREE_TYPE (rhs)) | |
| 2703 != TYPE_MAIN_VARIANT (cfun_va_list)) | |
| 2704 return NULL_TREE; | |
| 2705 | |
|
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2706 rhs = fold_convert_loc (loc, TREE_TYPE (lhs), rhs); |
| 0 | 2707 return build2 (MODIFY_EXPR, TREE_TYPE (lhs), lhs, rhs); |
| 2708 | |
| 2709 case BUILT_IN_VA_END: | |
| 2710 /* No effect, so the statement will be deleted. */ | |
| 2711 return integer_zero_node; | |
| 2712 | |
| 2713 default: | |
| 2714 gcc_unreachable (); | |
| 2715 } | |
| 2716 } | |
| 2717 | |
| 2718 /* A simple pass that attempts to fold all builtin functions. This pass | |
| 2719 is run after we've propagated as many constants as we can. */ | |
| 2720 | |
| 2721 static unsigned int | |
| 2722 execute_fold_all_builtins (void) | |
| 2723 { | |
| 2724 bool cfg_changed = false; | |
| 2725 basic_block bb; | |
| 2726 unsigned int todoflags = 0; | |
|
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2727 |
| 0 | 2728 FOR_EACH_BB (bb) |
| 2729 { | |
| 2730 gimple_stmt_iterator i; | |
| 2731 for (i = gsi_start_bb (bb); !gsi_end_p (i); ) | |
| 2732 { | |
| 2733 gimple stmt, old_stmt; | |
| 2734 tree callee, result; | |
| 2735 enum built_in_function fcode; | |
| 2736 | |
| 2737 stmt = gsi_stmt (i); | |
| 2738 | |
| 2739 if (gimple_code (stmt) != GIMPLE_CALL) | |
| 2740 { | |
| 2741 gsi_next (&i); | |
| 2742 continue; | |
| 2743 } | |
| 2744 callee = gimple_call_fndecl (stmt); | |
| 2745 if (!callee || DECL_BUILT_IN_CLASS (callee) != BUILT_IN_NORMAL) | |
| 2746 { | |
| 2747 gsi_next (&i); | |
| 2748 continue; | |
| 2749 } | |
| 2750 fcode = DECL_FUNCTION_CODE (callee); | |
| 2751 | |
|
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2752 result = gimple_fold_builtin (stmt); |
| 0 | 2753 |
| 2754 if (result) | |
| 2755 gimple_remove_stmt_histograms (cfun, stmt); | |
| 2756 | |
| 2757 if (!result) | |
| 2758 switch (DECL_FUNCTION_CODE (callee)) | |
| 2759 { | |
| 2760 case BUILT_IN_CONSTANT_P: | |
| 2761 /* Resolve __builtin_constant_p. If it hasn't been | |
| 2762 folded to integer_one_node by now, it's fairly | |
| 2763 certain that the value simply isn't constant. */ | |
| 2764 result = integer_zero_node; | |
| 2765 break; | |
| 2766 | |
| 2767 case BUILT_IN_STACK_RESTORE: | |
| 2768 result = optimize_stack_restore (i); | |
| 2769 if (result) | |
| 2770 break; | |
| 2771 gsi_next (&i); | |
| 2772 continue; | |
| 2773 | |
| 2774 case BUILT_IN_VA_START: | |
| 2775 case BUILT_IN_VA_END: | |
| 2776 case BUILT_IN_VA_COPY: | |
| 2777 /* These shouldn't be folded before pass_stdarg. */ | |
| 2778 result = optimize_stdarg_builtin (stmt); | |
| 2779 if (result) | |
| 2780 break; | |
| 2781 /* FALLTHRU */ | |
| 2782 | |
| 2783 default: | |
| 2784 gsi_next (&i); | |
| 2785 continue; | |
| 2786 } | |
| 2787 | |
| 2788 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 2789 { | |
| 2790 fprintf (dump_file, "Simplified\n "); | |
| 2791 print_gimple_stmt (dump_file, stmt, 0, dump_flags); | |
| 2792 } | |
| 2793 | |
| 2794 old_stmt = stmt; | |
| 2795 if (!update_call_from_tree (&i, result)) | |
|
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2796 { |
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2797 gimplify_and_update_call_from_tree (&i, result); |
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2798 todoflags |= TODO_update_address_taken; |
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2799 } |
| 0 | 2800 |
| 2801 stmt = gsi_stmt (i); | |
|
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2802 update_stmt (stmt); |
| 0 | 2803 |
| 2804 if (maybe_clean_or_replace_eh_stmt (old_stmt, stmt) | |
| 2805 && gimple_purge_dead_eh_edges (bb)) | |
| 2806 cfg_changed = true; | |
| 2807 | |
| 2808 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 2809 { | |
| 2810 fprintf (dump_file, "to\n "); | |
| 2811 print_gimple_stmt (dump_file, stmt, 0, dump_flags); | |
| 2812 fprintf (dump_file, "\n"); | |
| 2813 } | |
| 2814 | |
| 2815 /* Retry the same statement if it changed into another | |
| 2816 builtin, there might be new opportunities now. */ | |
| 2817 if (gimple_code (stmt) != GIMPLE_CALL) | |
| 2818 { | |
| 2819 gsi_next (&i); | |
| 2820 continue; | |
| 2821 } | |
| 2822 callee = gimple_call_fndecl (stmt); | |
| 2823 if (!callee | |
| 2824 || DECL_BUILT_IN_CLASS (callee) != BUILT_IN_NORMAL | |
| 2825 || DECL_FUNCTION_CODE (callee) == fcode) | |
| 2826 gsi_next (&i); | |
| 2827 } | |
| 2828 } | |
|
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2829 |
| 0 | 2830 /* Delete unreachable blocks. */ |
| 2831 if (cfg_changed) | |
| 2832 todoflags |= TODO_cleanup_cfg; | |
|
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2833 |
| 0 | 2834 return todoflags; |
| 2835 } | |
| 2836 | |
| 2837 | |
|
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2838 struct gimple_opt_pass pass_fold_builtins = |
| 0 | 2839 { |
| 2840 { | |
| 2841 GIMPLE_PASS, | |
| 2842 "fab", /* name */ | |
| 2843 NULL, /* gate */ | |
| 2844 execute_fold_all_builtins, /* execute */ | |
| 2845 NULL, /* sub */ | |
| 2846 NULL, /* next */ | |
| 2847 0, /* static_pass_number */ | |
|
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2848 TV_NONE, /* tv_id */ |
| 0 | 2849 PROP_cfg | PROP_ssa, /* properties_required */ |
| 2850 0, /* properties_provided */ | |
| 2851 0, /* properties_destroyed */ | |
| 2852 0, /* todo_flags_start */ | |
| 2853 TODO_dump_func | |
| 2854 | TODO_verify_ssa | |
| 2855 | TODO_update_ssa /* todo_flags_finish */ | |
| 2856 } | |
| 2857 }; |