Mercurial > hg > CbC > CbC_gcc
annotate gcc/ipa-inline.c @ 124:c3a50d7877e8
fix ipa-inline.c
| author | mir3636 |
|---|---|
| date | Sat, 31 Mar 2018 17:18:55 +0900 |
| parents | ab229f40eab2 |
| children | d34655255c78 |
| rev | line source |
|---|---|
| 0 | 1 /* Inlining decision heuristics. |
| 111 | 2 Copyright (C) 2003-2017 Free Software Foundation, Inc. |
| 0 | 3 Contributed by Jan Hubicka |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify it under | |
| 8 the terms of the GNU General Public License as published by the Free | |
| 9 Software Foundation; either version 3, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 /* Inlining decision heuristics | |
| 22 | |
| 111 | 23 The implementation of inliner is organized as follows: |
| 0 | 24 |
| 25 inlining heuristics limits | |
| 26 | |
| 111 | 27 can_inline_edge_p allow to check that particular inlining is allowed |
| 28 by the limits specified by user (allowed function growth, growth and so | |
| 29 on). | |
| 30 | |
| 31 Functions are inlined when it is obvious the result is profitable (such | |
| 32 as functions called once or when inlining reduce code size). | |
| 33 In addition to that we perform inlining of small functions and recursive | |
| 34 inlining. | |
| 0 | 35 |
| 36 inlining heuristics | |
| 37 | |
| 111 | 38 The inliner itself is split into two passes: |
| 39 | |
| 40 pass_early_inlining | |
| 0 | 41 |
| 111 | 42 Simple local inlining pass inlining callees into current function. |
| 43 This pass makes no use of whole unit analysis and thus it can do only | |
| 44 very simple decisions based on local properties. | |
| 0 | 45 |
| 111 | 46 The strength of the pass is that it is run in topological order |
| 47 (reverse postorder) on the callgraph. Functions are converted into SSA | |
| 48 form just before this pass and optimized subsequently. As a result, the | |
| 49 callees of the function seen by the early inliner was already optimized | |
| 50 and results of early inlining adds a lot of optimization opportunities | |
| 51 for the local optimization. | |
| 0 | 52 |
| 111 | 53 The pass handle the obvious inlining decisions within the compilation |
| 54 unit - inlining auto inline functions, inlining for size and | |
| 55 flattening. | |
| 0 | 56 |
| 111 | 57 main strength of the pass is the ability to eliminate abstraction |
| 58 penalty in C++ code (via combination of inlining and early | |
| 59 optimization) and thus improve quality of analysis done by real IPA | |
| 60 optimizers. | |
| 0 | 61 |
| 111 | 62 Because of lack of whole unit knowledge, the pass can not really make |
| 63 good code size/performance tradeoffs. It however does very simple | |
| 64 speculative inlining allowing code size to grow by | |
| 65 EARLY_INLINING_INSNS when callee is leaf function. In this case the | |
| 66 optimizations performed later are very likely to eliminate the cost. | |
| 0 | 67 |
| 111 | 68 pass_ipa_inline |
| 0 | 69 |
| 111 | 70 This is the real inliner able to handle inlining with whole program |
| 71 knowledge. It performs following steps: | |
| 72 | |
| 73 1) inlining of small functions. This is implemented by greedy | |
| 74 algorithm ordering all inlinable cgraph edges by their badness and | |
| 75 inlining them in this order as long as inline limits allows doing so. | |
| 0 | 76 |
| 111 | 77 This heuristics is not very good on inlining recursive calls. Recursive |
| 78 calls can be inlined with results similar to loop unrolling. To do so, | |
| 79 special purpose recursive inliner is executed on function when | |
| 80 recursive edge is met as viable candidate. | |
| 0 | 81 |
| 111 | 82 2) Unreachable functions are removed from callgraph. Inlining leads |
| 83 to devirtualization and other modification of callgraph so functions | |
| 84 may become unreachable during the process. Also functions declared as | |
| 85 extern inline or virtual functions are removed, since after inlining | |
| 86 we no longer need the offline bodies. | |
| 0 | 87 |
| 111 | 88 3) Functions called once and not exported from the unit are inlined. |
| 89 This should almost always lead to reduction of code size by eliminating | |
| 90 the need for offline copy of the function. */ | |
| 0 | 91 |
| 92 #include "config.h" | |
| 93 #include "system.h" | |
| 94 #include "coretypes.h" | |
| 111 | 95 #include "backend.h" |
| 96 #include "target.h" | |
| 97 #include "rtl.h" | |
| 0 | 98 #include "tree.h" |
| 111 | 99 #include "gimple.h" |
| 100 #include "alloc-pool.h" | |
| 101 #include "tree-pass.h" | |
| 102 #include "gimple-ssa.h" | |
| 103 #include "cgraph.h" | |
| 104 #include "lto-streamer.h" | |
| 105 #include "trans-mem.h" | |
| 106 #include "calls.h" | |
| 0 | 107 #include "tree-inline.h" |
| 108 #include "params.h" | |
| 111 | 109 #include "profile.h" |
| 110 #include "symbol-summary.h" | |
| 111 #include "tree-vrp.h" | |
| 0 | 112 #include "ipa-prop.h" |
| 111 | 113 #include "ipa-fnsummary.h" |
| 114 #include "ipa-inline.h" | |
| 115 #include "ipa-utils.h" | |
| 116 #include "sreal.h" | |
| 117 #include "auto-profile.h" | |
| 118 #include "builtins.h" | |
| 119 #include "fibonacci_heap.h" | |
| 120 #include "stringpool.h" | |
| 121 #include "attribs.h" | |
| 122 #include "asan.h" | |
| 122 | 123 #include "c/cbc-tree.h" |
| 0 | 124 |
| 111 | 125 typedef fibonacci_heap <sreal, cgraph_edge> edge_heap_t; |
| 126 typedef fibonacci_node <sreal, cgraph_edge> edge_heap_node_t; | |
| 0 | 127 |
| 128 /* Statistics we collect about inlining algorithm. */ | |
|
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129 static int overall_size; |
| 111 | 130 static profile_count max_count; |
| 131 static profile_count spec_rem; | |
| 0 | 132 |
| 111 | 133 /* Pre-computed constants 1/CGRAPH_FREQ_BASE and 1/100. */ |
| 134 static sreal cgraph_freq_base_rec, percent_rec; | |
| 135 | |
| 136 /* Return false when inlining edge E would lead to violating | |
| 137 limits on function unit growth or stack usage growth. | |
| 0 | 138 |
| 111 | 139 The relative function body growth limit is present generally |
| 140 to avoid problems with non-linear behavior of the compiler. | |
| 141 To allow inlining huge functions into tiny wrapper, the limit | |
| 142 is always based on the bigger of the two functions considered. | |
| 0 | 143 |
| 111 | 144 For stack growth limits we always base the growth in stack usage |
| 145 of the callers. We want to prevent applications from segfaulting | |
| 146 on stack overflow when functions with huge stack frames gets | |
| 147 inlined. */ | |
|
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148 |
| 111 | 149 static bool |
| 150 caller_growth_limits (struct cgraph_edge *e) | |
|
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151 { |
| 111 | 152 struct cgraph_node *to = e->caller; |
| 153 struct cgraph_node *what = e->callee->ultimate_alias_target (); | |
| 154 int newsize; | |
| 155 int limit = 0; | |
| 156 HOST_WIDE_INT stack_size_limit = 0, inlined_stack; | |
| 157 ipa_fn_summary *info, *what_info, *outer_info = ipa_fn_summaries->get (to); | |
| 0 | 158 |
| 111 | 159 /* Look for function e->caller is inlined to. While doing |
| 160 so work out the largest function body on the way. As | |
| 161 described above, we want to base our function growth | |
| 162 limits based on that. Not on the self size of the | |
| 163 outer function, not on the self size of inline code | |
| 164 we immediately inline to. This is the most relaxed | |
| 165 interpretation of the rule "do not grow large functions | |
| 166 too much in order to prevent compiler from exploding". */ | |
| 167 while (true) | |
|
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168 { |
| 111 | 169 info = ipa_fn_summaries->get (to); |
| 170 if (limit < info->self_size) | |
| 171 limit = info->self_size; | |
| 172 if (stack_size_limit < info->estimated_self_stack_size) | |
| 173 stack_size_limit = info->estimated_self_stack_size; | |
| 174 if (to->global.inlined_to) | |
| 175 to = to->callers->caller; | |
| 0 | 176 else |
| 111 | 177 break; |
| 0 | 178 } |
| 179 | |
| 111 | 180 what_info = ipa_fn_summaries->get (what); |
| 0 | 181 |
| 111 | 182 if (limit < what_info->self_size) |
| 183 limit = what_info->self_size; | |
| 0 | 184 |
| 185 limit += limit * PARAM_VALUE (PARAM_LARGE_FUNCTION_GROWTH) / 100; | |
| 186 | |
| 187 /* Check the size after inlining against the function limits. But allow | |
| 188 the function to shrink if it went over the limits by forced inlining. */ | |
| 111 | 189 newsize = estimate_size_after_inlining (to, e); |
| 190 if (newsize >= info->size | |
| 0 | 191 && newsize > PARAM_VALUE (PARAM_LARGE_FUNCTION_INSNS) |
| 192 && newsize > limit) | |
| 193 { | |
| 111 | 194 e->inline_failed = CIF_LARGE_FUNCTION_GROWTH_LIMIT; |
| 0 | 195 return false; |
| 196 } | |
| 197 | |
| 111 | 198 if (!what_info->estimated_stack_size) |
| 199 return true; | |
| 0 | 200 |
| 111 | 201 /* FIXME: Stack size limit often prevents inlining in Fortran programs |
| 202 due to large i/o datastructures used by the Fortran front-end. | |
| 203 We ought to ignore this limit when we know that the edge is executed | |
| 204 on every invocation of the caller (i.e. its call statement dominates | |
| 205 exit block). We do not track this information, yet. */ | |
| 206 stack_size_limit += ((gcov_type)stack_size_limit | |
| 207 * PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) / 100); | |
| 0 | 208 |
| 111 | 209 inlined_stack = (outer_info->stack_frame_offset |
| 210 + outer_info->estimated_self_stack_size | |
| 211 + what_info->estimated_stack_size); | |
| 212 /* Check new stack consumption with stack consumption at the place | |
| 213 stack is used. */ | |
| 214 if (inlined_stack > stack_size_limit | |
| 215 /* If function already has large stack usage from sibling | |
| 216 inline call, we can inline, too. | |
| 217 This bit overoptimistically assume that we are good at stack | |
| 218 packing. */ | |
| 219 && inlined_stack > info->estimated_stack_size | |
| 0 | 220 && inlined_stack > PARAM_VALUE (PARAM_LARGE_STACK_FRAME)) |
| 221 { | |
| 111 | 222 e->inline_failed = CIF_LARGE_STACK_FRAME_GROWTH_LIMIT; |
| 0 | 223 return false; |
| 224 } | |
| 225 return true; | |
| 226 } | |
| 227 | |
| 111 | 228 /* Dump info about why inlining has failed. */ |
| 229 | |
| 230 static void | |
| 231 report_inline_failed_reason (struct cgraph_edge *e) | |
| 232 { | |
| 233 if (dump_file) | |
| 234 { | |
| 235 fprintf (dump_file, " not inlinable: %s -> %s, %s\n", | |
| 236 e->caller->dump_name (), | |
| 237 e->callee->dump_name (), | |
| 238 cgraph_inline_failed_string (e->inline_failed)); | |
| 239 if ((e->inline_failed == CIF_TARGET_OPTION_MISMATCH | |
| 240 || e->inline_failed == CIF_OPTIMIZATION_MISMATCH) | |
| 241 && e->caller->lto_file_data | |
| 242 && e->callee->ultimate_alias_target ()->lto_file_data) | |
| 243 { | |
| 244 fprintf (dump_file, " LTO objects: %s, %s\n", | |
| 245 e->caller->lto_file_data->file_name, | |
| 246 e->callee->ultimate_alias_target ()->lto_file_data->file_name); | |
| 247 } | |
| 248 if (e->inline_failed == CIF_TARGET_OPTION_MISMATCH) | |
| 249 cl_target_option_print_diff | |
| 250 (dump_file, 2, target_opts_for_fn (e->caller->decl), | |
| 251 target_opts_for_fn (e->callee->ultimate_alias_target ()->decl)); | |
| 252 if (e->inline_failed == CIF_OPTIMIZATION_MISMATCH) | |
| 253 cl_optimization_print_diff | |
| 254 (dump_file, 2, opts_for_fn (e->caller->decl), | |
| 255 opts_for_fn (e->callee->ultimate_alias_target ()->decl)); | |
| 256 } | |
| 257 } | |
| 258 | |
| 259 /* Decide whether sanitizer-related attributes allow inlining. */ | |
| 0 | 260 |
|
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261 static bool |
| 111 | 262 sanitize_attrs_match_for_inline_p (const_tree caller, const_tree callee) |
| 0 | 263 { |
| 111 | 264 if (!caller || !callee) |
|
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265 return true; |
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266 |
| 111 | 267 return sanitize_flags_p (SANITIZE_ADDRESS, caller) |
| 268 == sanitize_flags_p (SANITIZE_ADDRESS, callee); | |
| 269 } | |
| 270 | |
| 271 /* Used for flags where it is safe to inline when caller's value is | |
| 272 grater than callee's. */ | |
| 273 #define check_maybe_up(flag) \ | |
| 274 (opts_for_fn (caller->decl)->x_##flag \ | |
| 275 != opts_for_fn (callee->decl)->x_##flag \ | |
| 276 && (!always_inline \ | |
| 277 || opts_for_fn (caller->decl)->x_##flag \ | |
| 278 < opts_for_fn (callee->decl)->x_##flag)) | |
| 279 /* Used for flags where it is safe to inline when caller's value is | |
| 280 smaller than callee's. */ | |
| 281 #define check_maybe_down(flag) \ | |
| 282 (opts_for_fn (caller->decl)->x_##flag \ | |
| 283 != opts_for_fn (callee->decl)->x_##flag \ | |
| 284 && (!always_inline \ | |
| 285 || opts_for_fn (caller->decl)->x_##flag \ | |
| 286 > opts_for_fn (callee->decl)->x_##flag)) | |
| 287 /* Used for flags where exact match is needed for correctness. */ | |
| 288 #define check_match(flag) \ | |
| 289 (opts_for_fn (caller->decl)->x_##flag \ | |
| 290 != opts_for_fn (callee->decl)->x_##flag) | |
| 291 | |
| 292 /* Decide if we can inline the edge and possibly update | |
| 293 inline_failed reason. | |
| 294 We check whether inlining is possible at all and whether | |
| 295 caller growth limits allow doing so. | |
| 296 | |
| 297 if REPORT is true, output reason to the dump file. | |
| 298 | |
| 299 if DISREGARD_LIMITS is true, ignore size limits.*/ | |
| 300 | |
| 301 static bool | |
| 302 can_inline_edge_p (struct cgraph_edge *e, bool report, | |
| 303 bool disregard_limits = false, bool early = false) | |
| 304 { | |
| 305 gcc_checking_assert (e->inline_failed); | |
| 306 | |
| 307 if (cgraph_inline_failed_type (e->inline_failed) == CIF_FINAL_ERROR) | |
| 0 | 308 { |
| 111 | 309 if (report) |
| 310 report_inline_failed_reason (e); | |
|
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311 return false; |
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312 } |
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313 |
| 111 | 314 bool inlinable = true; |
| 315 enum availability avail; | |
| 316 cgraph_node *caller = e->caller->global.inlined_to | |
| 317 ? e->caller->global.inlined_to : e->caller; | |
| 318 cgraph_node *callee = e->callee->ultimate_alias_target (&avail, caller); | |
| 319 tree caller_tree = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (caller->decl); | |
| 320 tree callee_tree | |
| 321 = callee ? DECL_FUNCTION_SPECIFIC_OPTIMIZATION (callee->decl) : NULL; | |
| 0 | 322 |
| 111 | 323 if (!callee->definition) |
| 324 { | |
| 325 e->inline_failed = CIF_BODY_NOT_AVAILABLE; | |
| 326 inlinable = false; | |
| 327 } | |
| 328 if (!early && !opt_for_fn (callee->decl, optimize)) | |
| 329 { | |
| 330 e->inline_failed = CIF_FUNCTION_NOT_OPTIMIZED; | |
| 331 inlinable = false; | |
| 332 } | |
| 333 else if (callee->calls_comdat_local) | |
| 334 { | |
| 335 e->inline_failed = CIF_USES_COMDAT_LOCAL; | |
| 336 inlinable = false; | |
| 337 } | |
| 338 else if (avail <= AVAIL_INTERPOSABLE) | |
| 339 { | |
| 340 e->inline_failed = CIF_OVERWRITABLE; | |
| 341 inlinable = false; | |
| 342 } | |
| 343 /* All edges with call_stmt_cannot_inline_p should have inline_failed | |
| 344 initialized to one of FINAL_ERROR reasons. */ | |
| 345 else if (e->call_stmt_cannot_inline_p) | |
| 346 gcc_unreachable (); | |
| 347 /* Don't inline if the functions have different EH personalities. */ | |
| 348 else if (DECL_FUNCTION_PERSONALITY (caller->decl) | |
| 349 && DECL_FUNCTION_PERSONALITY (callee->decl) | |
| 350 && (DECL_FUNCTION_PERSONALITY (caller->decl) | |
| 351 != DECL_FUNCTION_PERSONALITY (callee->decl))) | |
| 352 { | |
| 353 e->inline_failed = CIF_EH_PERSONALITY; | |
| 354 inlinable = false; | |
| 355 } | |
| 356 /* TM pure functions should not be inlined into non-TM_pure | |
| 357 functions. */ | |
| 358 else if (is_tm_pure (callee->decl) && !is_tm_pure (caller->decl)) | |
| 359 { | |
| 360 e->inline_failed = CIF_UNSPECIFIED; | |
| 361 inlinable = false; | |
| 362 } | |
| 363 /* Check compatibility of target optimization options. */ | |
| 364 else if (!targetm.target_option.can_inline_p (caller->decl, | |
| 365 callee->decl)) | |
| 366 { | |
| 367 e->inline_failed = CIF_TARGET_OPTION_MISMATCH; | |
| 368 inlinable = false; | |
| 369 } | |
| 370 else if (!ipa_fn_summaries->get (callee)->inlinable) | |
| 371 { | |
| 372 e->inline_failed = CIF_FUNCTION_NOT_INLINABLE; | |
| 373 inlinable = false; | |
| 374 } | |
| 375 /* Don't inline a function with mismatched sanitization attributes. */ | |
| 376 else if (!sanitize_attrs_match_for_inline_p (caller->decl, callee->decl)) | |
| 0 | 377 { |
| 111 | 378 e->inline_failed = CIF_ATTRIBUTE_MISMATCH; |
| 379 inlinable = false; | |
| 380 } | |
| 381 /* Check if caller growth allows the inlining. */ | |
| 382 else if (!DECL_DISREGARD_INLINE_LIMITS (callee->decl) | |
| 383 && !disregard_limits | |
| 384 && !lookup_attribute ("flatten", | |
| 385 DECL_ATTRIBUTES (caller->decl)) | |
| 386 && !caller_growth_limits (e)) | |
| 387 inlinable = false; | |
| 388 /* Don't inline a function with a higher optimization level than the | |
| 389 caller. FIXME: this is really just tip of iceberg of handling | |
| 390 optimization attribute. */ | |
| 391 else if (caller_tree != callee_tree) | |
| 392 { | |
| 393 bool always_inline = | |
| 394 (DECL_DISREGARD_INLINE_LIMITS (callee->decl) | |
| 395 && lookup_attribute ("always_inline", | |
| 396 DECL_ATTRIBUTES (callee->decl))); | |
| 397 ipa_fn_summary *caller_info = ipa_fn_summaries->get (caller); | |
| 398 ipa_fn_summary *callee_info = ipa_fn_summaries->get (callee); | |
| 399 | |
| 400 /* Until GCC 4.9 we did not check the semantics alterning flags | |
| 401 bellow and inline across optimization boundry. | |
| 402 Enabling checks bellow breaks several packages by refusing | |
| 403 to inline library always_inline functions. See PR65873. | |
| 404 Disable the check for early inlining for now until better solution | |
| 405 is found. */ | |
| 406 if (always_inline && early) | |
| 407 ; | |
| 408 /* There are some options that change IL semantics which means | |
| 409 we cannot inline in these cases for correctness reason. | |
| 410 Not even for always_inline declared functions. */ | |
| 411 else if (check_match (flag_wrapv) | |
| 412 || check_match (flag_trapv) | |
| 413 || check_match (flag_pcc_struct_return) | |
| 414 /* When caller or callee does FP math, be sure FP codegen flags | |
| 415 compatible. */ | |
| 416 || ((caller_info->fp_expressions && callee_info->fp_expressions) | |
| 417 && (check_maybe_up (flag_rounding_math) | |
| 418 || check_maybe_up (flag_trapping_math) | |
| 419 || check_maybe_down (flag_unsafe_math_optimizations) | |
| 420 || check_maybe_down (flag_finite_math_only) | |
| 421 || check_maybe_up (flag_signaling_nans) | |
| 422 || check_maybe_down (flag_cx_limited_range) | |
| 423 || check_maybe_up (flag_signed_zeros) | |
| 424 || check_maybe_down (flag_associative_math) | |
| 425 || check_maybe_down (flag_reciprocal_math) | |
| 426 || check_maybe_down (flag_fp_int_builtin_inexact) | |
| 427 /* Strictly speaking only when the callee contains function | |
| 428 calls that may end up setting errno. */ | |
| 429 || check_maybe_up (flag_errno_math))) | |
| 430 /* We do not want to make code compiled with exceptions to be | |
| 431 brought into a non-EH function unless we know that the callee | |
| 432 does not throw. | |
| 433 This is tracked by DECL_FUNCTION_PERSONALITY. */ | |
| 434 || (check_maybe_up (flag_non_call_exceptions) | |
| 435 && DECL_FUNCTION_PERSONALITY (callee->decl)) | |
| 436 || (check_maybe_up (flag_exceptions) | |
| 437 && DECL_FUNCTION_PERSONALITY (callee->decl)) | |
| 438 /* When devirtualization is diabled for callee, it is not safe | |
| 439 to inline it as we possibly mangled the type info. | |
| 440 Allow early inlining of always inlines. */ | |
| 441 || (!early && check_maybe_down (flag_devirtualize))) | |
| 0 | 442 { |
| 111 | 443 e->inline_failed = CIF_OPTIMIZATION_MISMATCH; |
| 444 inlinable = false; | |
| 445 } | |
| 446 /* gcc.dg/pr43564.c. Apply user-forced inline even at -O0. */ | |
| 447 else if (always_inline) | |
| 448 ; | |
| 449 /* When user added an attribute to the callee honor it. */ | |
| 450 else if (lookup_attribute ("optimize", DECL_ATTRIBUTES (callee->decl)) | |
| 451 && opts_for_fn (caller->decl) != opts_for_fn (callee->decl)) | |
| 452 { | |
| 453 e->inline_failed = CIF_OPTIMIZATION_MISMATCH; | |
| 454 inlinable = false; | |
| 455 } | |
| 456 /* If explicit optimize attribute are not used, the mismatch is caused | |
| 457 by different command line options used to build different units. | |
| 458 Do not care about COMDAT functions - those are intended to be | |
| 459 optimized with the optimization flags of module they are used in. | |
| 460 Also do not care about mixing up size/speed optimization when | |
| 461 DECL_DISREGARD_INLINE_LIMITS is set. */ | |
| 462 else if ((callee->merged_comdat | |
| 463 && !lookup_attribute ("optimize", | |
| 464 DECL_ATTRIBUTES (caller->decl))) | |
| 465 || DECL_DISREGARD_INLINE_LIMITS (callee->decl)) | |
| 466 ; | |
| 467 /* If mismatch is caused by merging two LTO units with different | |
| 468 optimizationflags we want to be bit nicer. However never inline | |
| 469 if one of functions is not optimized at all. */ | |
| 470 else if (!opt_for_fn (callee->decl, optimize) | |
| 471 || !opt_for_fn (caller->decl, optimize)) | |
| 472 { | |
| 473 e->inline_failed = CIF_OPTIMIZATION_MISMATCH; | |
| 474 inlinable = false; | |
| 475 } | |
| 476 /* If callee is optimized for size and caller is not, allow inlining if | |
| 477 code shrinks or we are in MAX_INLINE_INSNS_SINGLE limit and callee | |
| 478 is inline (and thus likely an unified comdat). This will allow caller | |
| 479 to run faster. */ | |
| 480 else if (opt_for_fn (callee->decl, optimize_size) | |
| 481 > opt_for_fn (caller->decl, optimize_size)) | |
| 482 { | |
| 483 int growth = estimate_edge_growth (e); | |
| 484 if (growth > 0 | |
| 485 && (!DECL_DECLARED_INLINE_P (callee->decl) | |
| 486 && growth >= MAX (MAX_INLINE_INSNS_SINGLE, | |
| 487 MAX_INLINE_INSNS_AUTO))) | |
| 488 { | |
| 489 e->inline_failed = CIF_OPTIMIZATION_MISMATCH; | |
| 490 inlinable = false; | |
| 491 } | |
| 492 } | |
| 493 /* If callee is more aggressively optimized for performance than caller, | |
| 494 we generally want to inline only cheap (runtime wise) functions. */ | |
| 495 else if (opt_for_fn (callee->decl, optimize_size) | |
| 496 < opt_for_fn (caller->decl, optimize_size) | |
| 497 || (opt_for_fn (callee->decl, optimize) | |
| 498 > opt_for_fn (caller->decl, optimize))) | |
| 499 { | |
| 500 if (estimate_edge_time (e) | |
| 501 >= 20 + ipa_call_summaries->get (e)->call_stmt_time) | |
| 502 { | |
| 503 e->inline_failed = CIF_OPTIMIZATION_MISMATCH; | |
| 504 inlinable = false; | |
| 505 } | |
| 0 | 506 } |
| 111 | 507 |
| 508 } | |
| 509 | |
| 510 if (!inlinable && report) | |
| 511 report_inline_failed_reason (e); | |
| 512 return inlinable; | |
| 513 } | |
| 514 | |
| 515 | |
| 516 /* Return true if the edge E is inlinable during early inlining. */ | |
| 517 | |
| 518 static bool | |
| 519 can_early_inline_edge_p (struct cgraph_edge *e) | |
| 520 { | |
| 521 struct cgraph_node *callee = e->callee->ultimate_alias_target (); | |
| 522 /* Early inliner might get called at WPA stage when IPA pass adds new | |
| 523 function. In this case we can not really do any of early inlining | |
| 524 because function bodies are missing. */ | |
| 525 if (cgraph_inline_failed_type (e->inline_failed) == CIF_FINAL_ERROR) | |
| 526 return false; | |
| 527 if (!gimple_has_body_p (callee->decl)) | |
| 528 { | |
| 529 e->inline_failed = CIF_BODY_NOT_AVAILABLE; | |
| 530 return false; | |
| 531 } | |
| 532 /* In early inliner some of callees may not be in SSA form yet | |
| 533 (i.e. the callgraph is cyclic and we did not process | |
| 534 the callee by early inliner, yet). We don't have CIF code for this | |
| 535 case; later we will re-do the decision in the real inliner. */ | |
| 536 if (!gimple_in_ssa_p (DECL_STRUCT_FUNCTION (e->caller->decl)) | |
| 537 || !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (callee->decl))) | |
| 538 { | |
| 539 if (dump_file) | |
| 540 fprintf (dump_file, " edge not inlinable: not in SSA form\n"); | |
| 541 return false; | |
| 542 } | |
| 543 if (!can_inline_edge_p (e, true, false, true)) | |
| 544 return false; | |
| 545 return true; | |
| 546 } | |
| 547 | |
| 548 | |
| 549 /* Return number of calls in N. Ignore cheap builtins. */ | |
| 550 | |
| 551 static int | |
| 552 num_calls (struct cgraph_node *n) | |
| 553 { | |
| 554 struct cgraph_edge *e; | |
| 555 int num = 0; | |
| 556 | |
| 557 for (e = n->callees; e; e = e->next_callee) | |
| 558 if (!is_inexpensive_builtin (e->callee->decl)) | |
| 559 num++; | |
| 560 return num; | |
| 561 } | |
| 562 | |
| 563 | |
| 564 /* Return true if we are interested in inlining small function. */ | |
| 565 | |
| 566 static bool | |
| 567 want_early_inline_function_p (struct cgraph_edge *e) | |
| 568 { | |
| 569 bool want_inline = true; | |
| 570 struct cgraph_node *callee = e->callee->ultimate_alias_target (); | |
| 571 | |
| 572 if (DECL_DISREGARD_INLINE_LIMITS (callee->decl)) | |
| 573 ; | |
| 574 /* For AutoFDO, we need to make sure that before profile summary, all | |
| 575 hot paths' IR look exactly the same as profiled binary. As a result, | |
| 576 in einliner, we will disregard size limit and inline those callsites | |
| 577 that are: | |
| 578 * inlined in the profiled binary, and | |
| 579 * the cloned callee has enough samples to be considered "hot". */ | |
| 580 else if (flag_auto_profile && afdo_callsite_hot_enough_for_early_inline (e)) | |
| 581 ; | |
| 582 else if (!DECL_DECLARED_INLINE_P (callee->decl) | |
| 583 && !opt_for_fn (e->caller->decl, flag_inline_small_functions)) | |
| 584 { | |
| 585 e->inline_failed = CIF_FUNCTION_NOT_INLINE_CANDIDATE; | |
| 586 report_inline_failed_reason (e); | |
| 587 want_inline = false; | |
| 0 | 588 } |
| 589 else | |
| 590 { | |
| 111 | 591 int growth = estimate_edge_growth (e); |
| 592 int n; | |
| 593 | |
| 594 if (growth <= 0) | |
| 595 ; | |
| 596 else if (!e->maybe_hot_p () | |
| 597 && growth > 0) | |
| 598 { | |
| 599 if (dump_file) | |
| 600 fprintf (dump_file, " will not early inline: %s->%s, " | |
| 601 "call is cold and code would grow by %i\n", | |
| 602 e->caller->dump_name (), | |
| 603 callee->dump_name (), | |
| 604 growth); | |
| 605 want_inline = false; | |
| 606 } | |
| 607 else if (growth > PARAM_VALUE (PARAM_EARLY_INLINING_INSNS)) | |
| 0 | 608 { |
| 111 | 609 if (dump_file) |
| 610 fprintf (dump_file, " will not early inline: %s->%s, " | |
| 611 "growth %i exceeds --param early-inlining-insns\n", | |
| 612 e->caller->dump_name (), | |
| 613 callee->dump_name (), | |
| 614 growth); | |
| 615 want_inline = false; | |
| 616 } | |
| 617 else if ((n = num_calls (callee)) != 0 | |
| 618 && growth * (n + 1) > PARAM_VALUE (PARAM_EARLY_INLINING_INSNS)) | |
| 619 { | |
| 620 if (dump_file) | |
| 621 fprintf (dump_file, " will not early inline: %s->%s, " | |
| 622 "growth %i exceeds --param early-inlining-insns " | |
| 623 "divided by number of calls\n", | |
| 624 e->caller->dump_name (), | |
| 625 callee->dump_name (), | |
| 626 growth); | |
| 627 want_inline = false; | |
| 0 | 628 } |
| 629 } | |
| 111 | 630 return want_inline; |
| 631 } | |
| 0 | 632 |
| 111 | 633 /* Compute time of the edge->caller + edge->callee execution when inlining |
| 634 does not happen. */ | |
| 635 | |
| 636 inline sreal | |
| 637 compute_uninlined_call_time (struct cgraph_edge *edge, | |
| 638 sreal uninlined_call_time) | |
| 639 { | |
| 640 cgraph_node *caller = (edge->caller->global.inlined_to | |
| 641 ? edge->caller->global.inlined_to | |
| 642 : edge->caller); | |
| 643 | |
| 644 if (edge->count > profile_count::zero () | |
| 645 && caller->count > profile_count::zero ()) | |
| 646 uninlined_call_time *= (sreal)edge->count.to_gcov_type () | |
| 647 / caller->count.to_gcov_type (); | |
| 648 if (edge->frequency) | |
| 649 uninlined_call_time *= cgraph_freq_base_rec * edge->frequency; | |
| 650 else | |
| 651 uninlined_call_time = uninlined_call_time >> 11; | |
| 652 | |
| 653 sreal caller_time = ipa_fn_summaries->get (caller)->time; | |
| 654 return uninlined_call_time + caller_time; | |
| 655 } | |
| 656 | |
| 657 /* Same as compute_uinlined_call_time but compute time when inlining | |
| 658 does happen. */ | |
| 659 | |
| 660 inline sreal | |
| 661 compute_inlined_call_time (struct cgraph_edge *edge, | |
| 662 sreal time) | |
| 663 { | |
| 664 cgraph_node *caller = (edge->caller->global.inlined_to | |
| 665 ? edge->caller->global.inlined_to | |
| 666 : edge->caller); | |
| 667 sreal caller_time = ipa_fn_summaries->get (caller)->time; | |
| 668 | |
| 669 if (edge->count > profile_count::zero () | |
| 670 && caller->count > profile_count::zero ()) | |
| 671 time *= (sreal)edge->count.to_gcov_type () / caller->count.to_gcov_type (); | |
| 672 if (edge->frequency) | |
| 673 time *= cgraph_freq_base_rec * edge->frequency; | |
| 674 else | |
| 675 time = time >> 11; | |
| 676 | |
| 677 /* This calculation should match one in ipa-inline-analysis.c | |
| 678 (estimate_edge_size_and_time). */ | |
| 679 time -= (sreal) edge->frequency | |
| 680 * ipa_call_summaries->get (edge)->call_stmt_time / CGRAPH_FREQ_BASE; | |
| 681 time += caller_time; | |
| 682 if (time <= 0) | |
| 683 time = ((sreal) 1) >> 8; | |
| 684 gcc_checking_assert (time >= 0); | |
| 685 return time; | |
| 686 } | |
| 687 | |
| 688 /* Return true if the speedup for inlining E is bigger than | |
| 689 PARAM_MAX_INLINE_MIN_SPEEDUP. */ | |
| 690 | |
| 691 static bool | |
| 692 big_speedup_p (struct cgraph_edge *e) | |
| 693 { | |
| 694 sreal unspec_time; | |
| 695 sreal spec_time = estimate_edge_time (e, &unspec_time); | |
| 696 sreal time = compute_uninlined_call_time (e, unspec_time); | |
| 697 sreal inlined_time = compute_inlined_call_time (e, spec_time); | |
| 698 | |
| 699 if (time - inlined_time | |
| 700 > (sreal) (time * PARAM_VALUE (PARAM_INLINE_MIN_SPEEDUP)) | |
| 701 * percent_rec) | |
| 702 return true; | |
| 703 return false; | |
| 0 | 704 } |
| 705 | |
| 111 | 706 /* Return true if we are interested in inlining small function. |
| 707 When REPORT is true, report reason to dump file. */ | |
| 708 | |
| 709 static bool | |
| 710 want_inline_small_function_p (struct cgraph_edge *e, bool report) | |
| 711 { | |
| 712 bool want_inline = true; | |
| 713 struct cgraph_node *callee = e->callee->ultimate_alias_target (); | |
| 714 | |
| 715 if (DECL_DISREGARD_INLINE_LIMITS (callee->decl)) | |
| 716 ; | |
| 717 else if (!DECL_DECLARED_INLINE_P (callee->decl) | |
| 718 && !opt_for_fn (e->caller->decl, flag_inline_small_functions)) | |
| 719 { | |
| 720 e->inline_failed = CIF_FUNCTION_NOT_INLINE_CANDIDATE; | |
| 721 want_inline = false; | |
| 722 } | |
| 723 /* Do fast and conservative check if the function can be good | |
| 724 inline candidate. At the moment we allow inline hints to | |
| 725 promote non-inline functions to inline and we increase | |
| 726 MAX_INLINE_INSNS_SINGLE 16-fold for inline functions. */ | |
| 727 else if ((!DECL_DECLARED_INLINE_P (callee->decl) | |
| 728 && (!e->count.initialized_p () || !e->maybe_hot_p ())) | |
| 729 && ipa_fn_summaries->get (callee)->min_size | |
| 730 - ipa_call_summaries->get (e)->call_stmt_size | |
| 731 > MAX (MAX_INLINE_INSNS_SINGLE, MAX_INLINE_INSNS_AUTO)) | |
| 732 { | |
| 733 e->inline_failed = CIF_MAX_INLINE_INSNS_AUTO_LIMIT; | |
| 734 want_inline = false; | |
| 735 } | |
| 736 else if ((DECL_DECLARED_INLINE_P (callee->decl) | |
| 737 || e->count > profile_count::zero ()) | |
| 738 && ipa_fn_summaries->get (callee)->min_size | |
| 739 - ipa_call_summaries->get (e)->call_stmt_size | |
| 740 > 16 * MAX_INLINE_INSNS_SINGLE) | |
| 741 { | |
| 742 e->inline_failed = (DECL_DECLARED_INLINE_P (callee->decl) | |
| 743 ? CIF_MAX_INLINE_INSNS_SINGLE_LIMIT | |
| 744 : CIF_MAX_INLINE_INSNS_AUTO_LIMIT); | |
| 745 want_inline = false; | |
| 746 } | |
| 747 else | |
| 748 { | |
| 749 int growth = estimate_edge_growth (e); | |
| 750 ipa_hints hints = estimate_edge_hints (e); | |
| 751 bool big_speedup = big_speedup_p (e); | |
| 0 | 752 |
| 111 | 753 if (growth <= 0) |
| 754 ; | |
| 755 /* Apply MAX_INLINE_INSNS_SINGLE limit. Do not do so when | |
| 756 hints suggests that inlining given function is very profitable. */ | |
| 757 else if (DECL_DECLARED_INLINE_P (callee->decl) | |
| 758 && growth >= MAX_INLINE_INSNS_SINGLE | |
| 759 && ((!big_speedup | |
| 760 && !(hints & (INLINE_HINT_indirect_call | |
| 761 | INLINE_HINT_known_hot | |
| 762 | INLINE_HINT_loop_iterations | |
| 763 | INLINE_HINT_array_index | |
| 764 | INLINE_HINT_loop_stride))) | |
| 765 || growth >= MAX_INLINE_INSNS_SINGLE * 16)) | |
| 766 { | |
| 767 e->inline_failed = CIF_MAX_INLINE_INSNS_SINGLE_LIMIT; | |
| 768 want_inline = false; | |
| 769 } | |
| 770 else if (!DECL_DECLARED_INLINE_P (callee->decl) | |
| 771 && !opt_for_fn (e->caller->decl, flag_inline_functions)) | |
| 772 { | |
| 773 /* growth_likely_positive is expensive, always test it last. */ | |
| 774 if (growth >= MAX_INLINE_INSNS_SINGLE | |
| 775 || growth_likely_positive (callee, growth)) | |
| 776 { | |
| 777 e->inline_failed = CIF_NOT_DECLARED_INLINED; | |
| 778 want_inline = false; | |
| 779 } | |
| 780 } | |
| 781 /* Apply MAX_INLINE_INSNS_AUTO limit for functions not declared inline | |
| 782 Upgrade it to MAX_INLINE_INSNS_SINGLE when hints suggests that | |
| 783 inlining given function is very profitable. */ | |
| 784 else if (!DECL_DECLARED_INLINE_P (callee->decl) | |
| 785 && !big_speedup | |
| 786 && !(hints & INLINE_HINT_known_hot) | |
| 787 && growth >= ((hints & (INLINE_HINT_indirect_call | |
| 788 | INLINE_HINT_loop_iterations | |
| 789 | INLINE_HINT_array_index | |
| 790 | INLINE_HINT_loop_stride)) | |
| 791 ? MAX (MAX_INLINE_INSNS_AUTO, | |
| 792 MAX_INLINE_INSNS_SINGLE) | |
| 793 : MAX_INLINE_INSNS_AUTO)) | |
| 794 { | |
| 795 /* growth_likely_positive is expensive, always test it last. */ | |
| 796 if (growth >= MAX_INLINE_INSNS_SINGLE | |
| 797 || growth_likely_positive (callee, growth)) | |
| 798 { | |
| 799 e->inline_failed = CIF_MAX_INLINE_INSNS_AUTO_LIMIT; | |
| 800 want_inline = false; | |
| 801 } | |
| 802 } | |
| 803 /* If call is cold, do not inline when function body would grow. */ | |
| 804 else if (!e->maybe_hot_p () | |
| 805 && (growth >= MAX_INLINE_INSNS_SINGLE | |
| 806 || growth_likely_positive (callee, growth))) | |
| 807 { | |
| 808 e->inline_failed = CIF_UNLIKELY_CALL; | |
| 809 want_inline = false; | |
| 810 } | |
| 811 } | |
| 812 if (!want_inline && report) | |
| 813 report_inline_failed_reason (e); | |
| 814 return want_inline; | |
| 815 } | |
| 816 | |
| 817 /* EDGE is self recursive edge. | |
| 818 We hand two cases - when function A is inlining into itself | |
| 819 or when function A is being inlined into another inliner copy of function | |
| 820 A within function B. | |
| 821 | |
| 822 In first case OUTER_NODE points to the toplevel copy of A, while | |
| 823 in the second case OUTER_NODE points to the outermost copy of A in B. | |
| 824 | |
| 825 In both cases we want to be extra selective since | |
| 826 inlining the call will just introduce new recursive calls to appear. */ | |
| 827 | |
| 828 static bool | |
| 829 want_inline_self_recursive_call_p (struct cgraph_edge *edge, | |
| 830 struct cgraph_node *outer_node, | |
| 831 bool peeling, | |
| 832 int depth) | |
| 0 | 833 { |
| 111 | 834 char const *reason = NULL; |
| 835 bool want_inline = true; | |
| 836 int caller_freq = CGRAPH_FREQ_BASE; | |
| 837 int max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO); | |
| 838 | |
| 839 if (DECL_DECLARED_INLINE_P (edge->caller->decl)) | |
| 840 max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH); | |
| 841 | |
| 842 if (!edge->maybe_hot_p ()) | |
| 843 { | |
| 844 reason = "recursive call is cold"; | |
| 845 want_inline = false; | |
| 846 } | |
| 847 else if (outer_node->count == profile_count::zero ()) | |
| 848 { | |
| 849 reason = "not executed in profile"; | |
| 850 want_inline = false; | |
| 851 } | |
| 852 else if (depth > max_depth) | |
| 853 { | |
| 854 reason = "--param max-inline-recursive-depth exceeded."; | |
| 855 want_inline = false; | |
| 856 } | |
| 857 | |
| 858 if (outer_node->global.inlined_to) | |
| 859 caller_freq = outer_node->callers->frequency; | |
| 860 | |
| 861 if (!caller_freq) | |
| 862 { | |
| 863 reason = "function is inlined and unlikely"; | |
| 864 want_inline = false; | |
| 865 } | |
| 866 | |
| 867 if (!want_inline) | |
| 868 ; | |
| 869 /* Inlining of self recursive function into copy of itself within other function | |
| 870 is transformation similar to loop peeling. | |
| 871 | |
| 872 Peeling is profitable if we can inline enough copies to make probability | |
| 873 of actual call to the self recursive function very small. Be sure that | |
| 874 the probability of recursion is small. | |
| 875 | |
| 876 We ensure that the frequency of recursing is at most 1 - (1/max_depth). | |
| 877 This way the expected number of recision is at most max_depth. */ | |
| 878 else if (peeling) | |
| 879 { | |
| 880 int max_prob = CGRAPH_FREQ_BASE - ((CGRAPH_FREQ_BASE + max_depth - 1) | |
| 881 / max_depth); | |
| 882 int i; | |
| 883 for (i = 1; i < depth; i++) | |
| 884 max_prob = max_prob * max_prob / CGRAPH_FREQ_BASE; | |
| 885 if (max_count > profile_count::zero () && edge->count > profile_count::zero () | |
| 886 && (edge->count.to_gcov_type () * CGRAPH_FREQ_BASE | |
| 887 / outer_node->count.to_gcov_type () | |
| 888 >= max_prob)) | |
| 889 { | |
| 890 reason = "profile of recursive call is too large"; | |
| 891 want_inline = false; | |
| 892 } | |
| 893 if (max_count == profile_count::zero () | |
| 894 && (edge->frequency * CGRAPH_FREQ_BASE / caller_freq | |
| 895 >= max_prob)) | |
| 896 { | |
| 897 reason = "frequency of recursive call is too large"; | |
| 898 want_inline = false; | |
| 899 } | |
| 900 } | |
| 901 /* Recursive inlining, i.e. equivalent of unrolling, is profitable if recursion | |
| 902 depth is large. We reduce function call overhead and increase chances that | |
| 903 things fit in hardware return predictor. | |
| 904 | |
| 905 Recursive inlining might however increase cost of stack frame setup | |
| 906 actually slowing down functions whose recursion tree is wide rather than | |
| 907 deep. | |
| 908 | |
| 909 Deciding reliably on when to do recursive inlining without profile feedback | |
| 910 is tricky. For now we disable recursive inlining when probability of self | |
| 911 recursion is low. | |
| 912 | |
| 913 Recursive inlining of self recursive call within loop also results in large loop | |
| 914 depths that generally optimize badly. We may want to throttle down inlining | |
| 915 in those cases. In particular this seems to happen in one of libstdc++ rb tree | |
| 916 methods. */ | |
| 0 | 917 else |
| 111 | 918 { |
| 919 if (max_count > profile_count::zero () && edge->count.initialized_p () | |
| 920 && (edge->count.to_gcov_type () * 100 | |
| 921 / outer_node->count.to_gcov_type () | |
| 922 <= PARAM_VALUE (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY))) | |
| 923 { | |
| 924 reason = "profile of recursive call is too small"; | |
| 925 want_inline = false; | |
| 926 } | |
| 927 else if ((max_count == profile_count::zero () | |
| 928 || !edge->count.initialized_p ()) | |
| 929 && (edge->frequency * 100 / caller_freq | |
| 930 <= PARAM_VALUE (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY))) | |
| 931 { | |
| 932 reason = "frequency of recursive call is too small"; | |
| 933 want_inline = false; | |
| 934 } | |
| 935 } | |
| 936 if (!want_inline && dump_file) | |
| 937 fprintf (dump_file, " not inlining recursively: %s\n", reason); | |
| 938 return want_inline; | |
| 939 } | |
| 940 | |
| 941 /* Return true when NODE has uninlinable caller; | |
| 942 set HAS_HOT_CALL if it has hot call. | |
| 943 Worker for cgraph_for_node_and_aliases. */ | |
| 944 | |
| 945 static bool | |
| 946 check_callers (struct cgraph_node *node, void *has_hot_call) | |
| 947 { | |
| 948 struct cgraph_edge *e; | |
| 949 for (e = node->callers; e; e = e->next_caller) | |
| 950 { | |
| 951 if (!opt_for_fn (e->caller->decl, flag_inline_functions_called_once) | |
| 952 || !opt_for_fn (e->caller->decl, optimize)) | |
| 953 return true; | |
| 954 if (!can_inline_edge_p (e, true)) | |
| 955 return true; | |
| 956 if (e->recursive_p ()) | |
| 957 return true; | |
| 958 if (!(*(bool *)has_hot_call) && e->maybe_hot_p ()) | |
| 959 *(bool *)has_hot_call = true; | |
| 960 } | |
| 961 return false; | |
| 962 } | |
| 963 | |
| 964 /* If NODE has a caller, return true. */ | |
| 965 | |
| 966 static bool | |
| 967 has_caller_p (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
| 968 { | |
| 969 if (node->callers) | |
| 970 return true; | |
| 971 return false; | |
| 972 } | |
| 973 | |
| 974 /* Decide if inlining NODE would reduce unit size by eliminating | |
| 975 the offline copy of function. | |
| 976 When COLD is true the cold calls are considered, too. */ | |
| 977 | |
| 978 static bool | |
| 979 want_inline_function_to_all_callers_p (struct cgraph_node *node, bool cold) | |
| 980 { | |
| 981 bool has_hot_call = false; | |
| 982 | |
| 983 /* Aliases gets inlined along with the function they alias. */ | |
| 984 if (node->alias) | |
| 985 return false; | |
| 986 /* Already inlined? */ | |
| 987 if (node->global.inlined_to) | |
| 988 return false; | |
| 989 /* Does it have callers? */ | |
| 990 if (!node->call_for_symbol_and_aliases (has_caller_p, NULL, true)) | |
| 991 return false; | |
| 992 /* Inlining into all callers would increase size? */ | |
| 993 if (estimate_growth (node) > 0) | |
| 994 return false; | |
| 995 /* All inlines must be possible. */ | |
| 996 if (node->call_for_symbol_and_aliases (check_callers, &has_hot_call, | |
| 997 true)) | |
| 998 return false; | |
| 999 if (!cold && !has_hot_call) | |
| 1000 return false; | |
| 1001 return true; | |
| 0 | 1002 } |
| 1003 | |
| 1004 /* A cost model driving the inlining heuristics in a way so the edges with | |
| 1005 smallest badness are inlined first. After each inlining is performed | |
| 1006 the costs of all caller edges of nodes affected are recomputed so the | |
| 1007 metrics may accurately depend on values such as number of inlinable callers | |
| 1008 of the function or function body size. */ | |
| 1009 | |
| 111 | 1010 static sreal |
| 1011 edge_badness (struct cgraph_edge *edge, bool dump) | |
| 0 | 1012 { |
| 111 | 1013 sreal badness; |
| 1014 int growth; | |
| 1015 sreal edge_time, unspec_edge_time; | |
| 1016 struct cgraph_node *callee = edge->callee->ultimate_alias_target (); | |
| 1017 struct ipa_fn_summary *callee_info = ipa_fn_summaries->get (callee); | |
| 1018 ipa_hints hints; | |
| 1019 cgraph_node *caller = (edge->caller->global.inlined_to | |
| 1020 ? edge->caller->global.inlined_to | |
| 1021 : edge->caller); | |
|
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1022 |
| 111 | 1023 growth = estimate_edge_growth (edge); |
| 1024 edge_time = estimate_edge_time (edge, &unspec_edge_time); | |
| 1025 hints = estimate_edge_hints (edge); | |
| 1026 gcc_checking_assert (edge_time >= 0); | |
| 1027 /* Check that inlined time is better, but tolerate some roundoff issues. */ | |
| 1028 gcc_checking_assert ((edge_time - callee_info->time).to_int () <= 0); | |
| 1029 gcc_checking_assert (growth <= callee_info->size); | |
| 0 | 1030 |
|
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1031 if (dump) |
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1032 { |
|
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1033 fprintf (dump_file, " Badness calculation for %s -> %s\n", |
| 111 | 1034 edge->caller->dump_name (), |
| 1035 edge->callee->dump_name ()); | |
| 1036 fprintf (dump_file, " size growth %i, time %f unspec %f ", | |
|
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1037 growth, |
| 111 | 1038 edge_time.to_double (), |
| 1039 unspec_edge_time.to_double ()); | |
| 1040 ipa_dump_hints (dump_file, hints); | |
| 1041 if (big_speedup_p (edge)) | |
| 1042 fprintf (dump_file, " big_speedup"); | |
| 1043 fprintf (dump_file, "\n"); | |
|
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1044 } |
| 0 | 1045 |
| 1046 /* Always prefer inlining saving code size. */ | |
| 1047 if (growth <= 0) | |
|
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1048 { |
| 111 | 1049 badness = (sreal) (-SREAL_MIN_SIG + growth) << (SREAL_MAX_EXP / 256); |
|
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1050 if (dump) |
| 111 | 1051 fprintf (dump_file, " %f: Growth %d <= 0\n", badness.to_double (), |
|
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1052 growth); |
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1053 } |
| 111 | 1054 /* Inlining into EXTERNAL functions is not going to change anything unless |
| 1055 they are themselves inlined. */ | |
| 1056 else if (DECL_EXTERNAL (caller->decl)) | |
| 1057 { | |
| 1058 if (dump) | |
| 1059 fprintf (dump_file, " max: function is external\n"); | |
| 1060 return sreal::max (); | |
| 1061 } | |
| 1062 /* When profile is available. Compute badness as: | |
| 1063 | |
| 1064 time_saved * caller_count | |
| 1065 goodness = ------------------------------------------------- | |
| 1066 growth_of_caller * overall_growth * combined_size | |
| 0 | 1067 |
| 111 | 1068 badness = - goodness |
| 1069 | |
| 1070 Again use negative value to make calls with profile appear hotter | |
| 1071 then calls without. | |
| 1072 */ | |
| 1073 else if (opt_for_fn (caller->decl, flag_guess_branch_prob) | |
| 1074 || caller->count > profile_count::zero ()) | |
|
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1075 { |
| 111 | 1076 sreal numerator, denominator; |
| 1077 int overall_growth; | |
| 1078 sreal inlined_time = compute_inlined_call_time (edge, edge_time); | |
| 1079 | |
| 1080 numerator = (compute_uninlined_call_time (edge, unspec_edge_time) | |
| 1081 - inlined_time); | |
| 1082 if (numerator == 0) | |
| 1083 numerator = ((sreal) 1 >> 8); | |
| 1084 if (caller->count > profile_count::zero ()) | |
| 1085 numerator *= caller->count.to_gcov_type (); | |
| 1086 else if (caller->count.initialized_p ()) | |
| 1087 numerator = numerator >> 11; | |
| 1088 denominator = growth; | |
| 1089 | |
| 1090 overall_growth = callee_info->growth; | |
| 1091 | |
| 1092 /* Look for inliner wrappers of the form: | |
| 1093 | |
| 1094 inline_caller () | |
| 1095 { | |
| 1096 do_fast_job... | |
| 1097 if (need_more_work) | |
| 1098 noninline_callee (); | |
| 1099 } | |
| 1100 Withhout panilizing this case, we usually inline noninline_callee | |
| 1101 into the inline_caller because overall_growth is small preventing | |
| 1102 further inlining of inline_caller. | |
| 1103 | |
| 1104 Penalize only callgraph edges to functions with small overall | |
| 1105 growth ... | |
| 1106 */ | |
| 1107 if (growth > overall_growth | |
| 1108 /* ... and having only one caller which is not inlined ... */ | |
| 1109 && callee_info->single_caller | |
| 1110 && !edge->caller->global.inlined_to | |
| 1111 /* ... and edges executed only conditionally ... */ | |
| 1112 && edge->frequency < CGRAPH_FREQ_BASE | |
| 1113 /* ... consider case where callee is not inline but caller is ... */ | |
| 1114 && ((!DECL_DECLARED_INLINE_P (edge->callee->decl) | |
| 1115 && DECL_DECLARED_INLINE_P (caller->decl)) | |
| 1116 /* ... or when early optimizers decided to split and edge | |
| 1117 frequency still indicates splitting is a win ... */ | |
| 1118 || (callee->split_part && !caller->split_part | |
| 1119 && edge->frequency | |
| 1120 < CGRAPH_FREQ_BASE | |
| 1121 * PARAM_VALUE | |
| 1122 (PARAM_PARTIAL_INLINING_ENTRY_PROBABILITY) / 100 | |
| 1123 /* ... and do not overwrite user specified hints. */ | |
| 1124 && (!DECL_DECLARED_INLINE_P (edge->callee->decl) | |
| 1125 || DECL_DECLARED_INLINE_P (caller->decl))))) | |
| 1126 { | |
| 1127 struct ipa_fn_summary *caller_info = ipa_fn_summaries->get (caller); | |
| 1128 int caller_growth = caller_info->growth; | |
| 1129 | |
| 1130 /* Only apply the penalty when caller looks like inline candidate, | |
| 1131 and it is not called once and. */ | |
| 1132 if (!caller_info->single_caller && overall_growth < caller_growth | |
| 1133 && caller_info->inlinable | |
| 1134 && caller_info->size | |
| 1135 < (DECL_DECLARED_INLINE_P (caller->decl) | |
| 1136 ? MAX_INLINE_INSNS_SINGLE : MAX_INLINE_INSNS_AUTO)) | |
| 1137 { | |
| 1138 if (dump) | |
| 1139 fprintf (dump_file, | |
| 1140 " Wrapper penalty. Increasing growth %i to %i\n", | |
| 1141 overall_growth, caller_growth); | |
| 1142 overall_growth = caller_growth; | |
| 1143 } | |
| 1144 } | |
| 1145 if (overall_growth > 0) | |
| 1146 { | |
| 1147 /* Strongly preffer functions with few callers that can be inlined | |
| 1148 fully. The square root here leads to smaller binaries at average. | |
| 1149 Watch however for extreme cases and return to linear function | |
| 1150 when growth is large. */ | |
| 1151 if (overall_growth < 256) | |
| 1152 overall_growth *= overall_growth; | |
| 1153 else | |
| 1154 overall_growth += 256 * 256 - 256; | |
| 1155 denominator *= overall_growth; | |
| 1156 } | |
| 1157 denominator *= inlined_time; | |
| 1158 | |
| 1159 badness = - numerator / denominator; | |
| 1160 | |
|
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1161 if (dump) |
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1162 { |
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1163 fprintf (dump_file, |
| 111 | 1164 " %f: guessed profile. frequency %f, count %" PRId64 |
| 1165 " caller count %" PRId64 | |
| 1166 " time w/o inlining %f, time with inlining %f" | |
| 1167 " overall growth %i (current) %i (original)" | |
| 1168 " %i (compensated)\n", | |
| 1169 badness.to_double (), | |
| 1170 (double)edge->frequency / CGRAPH_FREQ_BASE, | |
| 1171 edge->count.initialized_p () ? edge->count.to_gcov_type () : -1, | |
| 1172 caller->count.initialized_p () ? caller->count.to_gcov_type () : -1, | |
| 1173 compute_uninlined_call_time (edge, | |
| 1174 unspec_edge_time).to_double (), | |
| 1175 compute_inlined_call_time (edge, edge_time).to_double (), | |
| 1176 estimate_growth (callee), | |
| 1177 callee_info->growth, overall_growth); | |
|
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1178 } |
| 0 | 1179 } |
| 1180 /* When function local profile is not available or it does not give | |
| 1181 useful information (ie frequency is zero), base the cost on | |
| 1182 loop nest and overall size growth, so we optimize for overall number | |
| 1183 of functions fully inlined in program. */ | |
| 1184 else | |
| 1185 { | |
| 111 | 1186 int nest = MIN (ipa_call_summaries->get (edge)->loop_depth, 8); |
| 1187 badness = growth; | |
| 0 | 1188 |
| 1189 /* Decrease badness if call is nested. */ | |
|
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1190 if (badness > 0) |
| 111 | 1191 badness = badness >> nest; |
| 0 | 1192 else |
| 111 | 1193 badness = badness << nest; |
|
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1194 if (dump) |
| 111 | 1195 fprintf (dump_file, " %f: no profile. nest %i\n", |
| 1196 badness.to_double (), nest); | |
| 0 | 1197 } |
| 111 | 1198 gcc_checking_assert (badness != 0); |
|
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1199 |
| 111 | 1200 if (edge->recursive_p ()) |
| 1201 badness = badness.shift (badness > 0 ? 4 : -4); | |
| 1202 if ((hints & (INLINE_HINT_indirect_call | |
| 1203 | INLINE_HINT_loop_iterations | |
| 1204 | INLINE_HINT_array_index | |
| 1205 | INLINE_HINT_loop_stride)) | |
| 1206 || callee_info->growth <= 0) | |
| 1207 badness = badness.shift (badness > 0 ? -2 : 2); | |
| 1208 if (hints & (INLINE_HINT_same_scc)) | |
| 1209 badness = badness.shift (badness > 0 ? 3 : -3); | |
| 1210 else if (hints & (INLINE_HINT_in_scc)) | |
| 1211 badness = badness.shift (badness > 0 ? 2 : -2); | |
| 1212 else if (hints & (INLINE_HINT_cross_module)) | |
| 1213 badness = badness.shift (badness > 0 ? 1 : -1); | |
| 1214 if (DECL_DISREGARD_INLINE_LIMITS (callee->decl)) | |
| 1215 badness = badness.shift (badness > 0 ? -4 : 4); | |
| 1216 else if ((hints & INLINE_HINT_declared_inline)) | |
| 1217 badness = badness.shift (badness > 0 ? -3 : 3); | |
| 1218 if (dump) | |
| 1219 fprintf (dump_file, " Adjusted by hints %f\n", badness.to_double ()); | |
| 1220 return badness; | |
| 0 | 1221 } |
| 1222 | |
|
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1223 /* Recompute badness of EDGE and update its key in HEAP if needed. */ |
| 111 | 1224 static inline void |
| 1225 update_edge_key (edge_heap_t *heap, struct cgraph_edge *edge) | |
|
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1226 { |
| 111 | 1227 sreal badness = edge_badness (edge, false); |
|
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1228 if (edge->aux) |
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1229 { |
| 111 | 1230 edge_heap_node_t *n = (edge_heap_node_t *) edge->aux; |
| 1231 gcc_checking_assert (n->get_data () == edge); | |
|
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1232 |
| 111 | 1233 /* fibonacci_heap::replace_key does busy updating of the |
| 1234 heap that is unnecesarily expensive. | |
| 1235 We do lazy increases: after extracting minimum if the key | |
| 1236 turns out to be out of date, it is re-inserted into heap | |
| 1237 with correct value. */ | |
| 1238 if (badness < n->get_key ()) | |
|
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1239 { |
| 111 | 1240 if (dump_file && (dump_flags & TDF_DETAILS)) |
| 1241 { | |
| 1242 fprintf (dump_file, | |
| 1243 " decreasing badness %s -> %s, %f to %f\n", | |
| 1244 edge->caller->dump_name (), | |
| 1245 edge->callee->dump_name (), | |
| 1246 n->get_key ().to_double (), | |
| 1247 badness.to_double ()); | |
| 1248 } | |
| 1249 heap->decrease_key (n, badness); | |
|
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1250 } |
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1251 } |
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1252 else |
| 111 | 1253 { |
| 1254 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1255 { | |
| 1256 fprintf (dump_file, | |
| 1257 " enqueuing call %s -> %s, badness %f\n", | |
| 1258 edge->caller->dump_name (), | |
| 1259 edge->callee->dump_name (), | |
| 1260 badness.to_double ()); | |
| 1261 } | |
| 1262 edge->aux = heap->insert (badness, edge); | |
| 1263 } | |
|
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1264 } |
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1265 |
| 111 | 1266 |
| 1267 /* NODE was inlined. | |
| 1268 All caller edges needs to be resetted because | |
| 1269 size estimates change. Similarly callees needs reset | |
| 1270 because better context may be known. */ | |
| 0 | 1271 |
| 1272 static void | |
| 111 | 1273 reset_edge_caches (struct cgraph_node *node) |
| 0 | 1274 { |
| 1275 struct cgraph_edge *edge; | |
| 111 | 1276 struct cgraph_edge *e = node->callees; |
| 1277 struct cgraph_node *where = node; | |
| 1278 struct ipa_ref *ref; | |
| 0 | 1279 |
| 111 | 1280 if (where->global.inlined_to) |
| 1281 where = where->global.inlined_to; | |
| 0 | 1282 |
| 111 | 1283 for (edge = where->callers; edge; edge = edge->next_caller) |
|
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1284 if (edge->inline_failed) |
| 111 | 1285 reset_edge_growth_cache (edge); |
| 0 | 1286 |
| 111 | 1287 FOR_EACH_ALIAS (where, ref) |
| 1288 reset_edge_caches (dyn_cast <cgraph_node *> (ref->referring)); | |
| 0 | 1289 |
|
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1290 if (!e) |
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1291 return; |
| 111 | 1292 |
|
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1293 while (true) |
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1294 if (!e->inline_failed && e->callee->callees) |
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1295 e = e->callee->callees; |
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1296 else |
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1297 { |
| 111 | 1298 if (e->inline_failed) |
| 1299 reset_edge_growth_cache (e); | |
|
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1300 if (e->next_callee) |
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1301 e = e->next_callee; |
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1302 else |
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1303 { |
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1304 do |
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1305 { |
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1306 if (e->caller == node) |
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1307 return; |
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1308 e = e->caller->callers; |
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1309 } |
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1310 while (!e->next_callee); |
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1311 e = e->next_callee; |
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1312 } |
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1313 } |
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1314 } |
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1315 |
| 111 | 1316 /* Recompute HEAP nodes for each of caller of NODE. |
| 1317 UPDATED_NODES track nodes we already visited, to avoid redundant work. | |
| 1318 When CHECK_INLINABLITY_FOR is set, re-check for specified edge that | |
| 1319 it is inlinable. Otherwise check all edges. */ | |
|
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1320 |
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1321 static void |
| 111 | 1322 update_caller_keys (edge_heap_t *heap, struct cgraph_node *node, |
| 1323 bitmap updated_nodes, | |
| 1324 struct cgraph_edge *check_inlinablity_for) | |
| 1325 { | |
| 1326 struct cgraph_edge *edge; | |
| 1327 struct ipa_ref *ref; | |
| 1328 | |
| 1329 if ((!node->alias && !ipa_fn_summaries->get (node)->inlinable) | |
| 1330 || node->global.inlined_to) | |
| 1331 return; | |
| 1332 if (!bitmap_set_bit (updated_nodes, node->uid)) | |
| 1333 return; | |
| 1334 | |
| 1335 FOR_EACH_ALIAS (node, ref) | |
| 1336 { | |
| 1337 struct cgraph_node *alias = dyn_cast <cgraph_node *> (ref->referring); | |
| 1338 update_caller_keys (heap, alias, updated_nodes, check_inlinablity_for); | |
| 1339 } | |
| 1340 | |
| 1341 for (edge = node->callers; edge; edge = edge->next_caller) | |
| 1342 if (edge->inline_failed) | |
| 1343 { | |
| 1344 if (!check_inlinablity_for | |
| 1345 || check_inlinablity_for == edge) | |
| 1346 { | |
| 1347 if (can_inline_edge_p (edge, false) | |
| 1348 && want_inline_small_function_p (edge, false)) | |
| 1349 update_edge_key (heap, edge); | |
| 1350 else if (edge->aux) | |
| 1351 { | |
| 1352 report_inline_failed_reason (edge); | |
| 1353 heap->delete_node ((edge_heap_node_t *) edge->aux); | |
| 1354 edge->aux = NULL; | |
| 1355 } | |
| 1356 } | |
| 1357 else if (edge->aux) | |
| 1358 update_edge_key (heap, edge); | |
| 1359 } | |
| 1360 } | |
| 1361 | |
| 1362 /* Recompute HEAP nodes for each uninlined call in NODE. | |
| 1363 This is used when we know that edge badnesses are going only to increase | |
| 1364 (we introduced new call site) and thus all we need is to insert newly | |
| 1365 created edges into heap. */ | |
| 1366 | |
| 1367 static void | |
| 1368 update_callee_keys (edge_heap_t *heap, struct cgraph_node *node, | |
| 1369 bitmap updated_nodes) | |
|
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1370 { |
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1371 struct cgraph_edge *e = node->callees; |
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1372 |
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1373 if (!e) |
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1374 return; |
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1375 while (true) |
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1376 if (!e->inline_failed && e->callee->callees) |
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1377 e = e->callee->callees; |
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1378 else |
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1379 { |
| 111 | 1380 enum availability avail; |
| 1381 struct cgraph_node *callee; | |
| 1382 /* We do not reset callee growth cache here. Since we added a new call, | |
| 1383 growth chould have just increased and consequentely badness metric | |
| 1384 don't need updating. */ | |
| 1385 if (e->inline_failed | |
| 1386 && (callee = e->callee->ultimate_alias_target (&avail, e->caller)) | |
| 1387 && ipa_fn_summaries->get (callee)->inlinable | |
| 1388 && avail >= AVAIL_AVAILABLE | |
| 1389 && !bitmap_bit_p (updated_nodes, callee->uid)) | |
| 1390 { | |
| 1391 if (can_inline_edge_p (e, false) | |
| 1392 && want_inline_small_function_p (e, false)) | |
| 1393 update_edge_key (heap, e); | |
| 1394 else if (e->aux) | |
| 1395 { | |
| 1396 report_inline_failed_reason (e); | |
| 1397 heap->delete_node ((edge_heap_node_t *) e->aux); | |
| 1398 e->aux = NULL; | |
| 1399 } | |
| 1400 } | |
|
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1401 if (e->next_callee) |
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1402 e = e->next_callee; |
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1403 else |
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1404 { |
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1405 do |
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1406 { |
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1407 if (e->caller == node) |
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1408 return; |
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1409 e = e->caller->callers; |
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1410 } |
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1411 while (!e->next_callee); |
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1412 e = e->next_callee; |
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1413 } |
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1414 } |
| 0 | 1415 } |
| 1416 | |
| 1417 /* Enqueue all recursive calls from NODE into priority queue depending on | |
| 1418 how likely we want to recursively inline the call. */ | |
| 1419 | |
| 1420 static void | |
| 1421 lookup_recursive_calls (struct cgraph_node *node, struct cgraph_node *where, | |
| 111 | 1422 edge_heap_t *heap) |
| 0 | 1423 { |
| 1424 struct cgraph_edge *e; | |
| 111 | 1425 enum availability avail; |
| 1426 | |
| 0 | 1427 for (e = where->callees; e; e = e->next_callee) |
| 111 | 1428 if (e->callee == node |
| 1429 || (e->callee->ultimate_alias_target (&avail, e->caller) == node | |
| 1430 && avail > AVAIL_INTERPOSABLE)) | |
| 0 | 1431 { |
| 1432 /* When profile feedback is available, prioritize by expected number | |
| 111 | 1433 of calls. */ |
| 1434 heap->insert (!(max_count > 0) || !e->count.initialized_p () ? -e->frequency | |
| 1435 : -(e->count.to_gcov_type () | |
| 1436 / ((max_count.to_gcov_type () + (1<<24) - 1) | |
| 1437 / (1<<24))), | |
| 1438 e); | |
| 0 | 1439 } |
| 1440 for (e = where->callees; e; e = e->next_callee) | |
| 1441 if (!e->inline_failed) | |
| 1442 lookup_recursive_calls (node, e->callee, heap); | |
| 1443 } | |
| 1444 | |
| 1445 /* Decide on recursive inlining: in the case function has recursive calls, | |
| 1446 inline until body size reaches given argument. If any new indirect edges | |
| 1447 are discovered in the process, add them to *NEW_EDGES, unless NEW_EDGES | |
| 1448 is NULL. */ | |
| 1449 | |
| 1450 static bool | |
| 111 | 1451 recursive_inlining (struct cgraph_edge *edge, |
| 1452 vec<cgraph_edge *> *new_edges) | |
| 0 | 1453 { |
| 1454 int limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO); | |
| 111 | 1455 edge_heap_t heap (sreal::min ()); |
| 1456 struct cgraph_node *node; | |
| 0 | 1457 struct cgraph_edge *e; |
| 111 | 1458 struct cgraph_node *master_clone = NULL, *next; |
| 0 | 1459 int depth = 0; |
| 1460 int n = 0; | |
| 1461 | |
| 111 | 1462 node = edge->caller; |
| 1463 if (node->global.inlined_to) | |
| 1464 node = node->global.inlined_to; | |
| 0 | 1465 |
| 1466 if (DECL_DECLARED_INLINE_P (node->decl)) | |
| 111 | 1467 limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE); |
| 0 | 1468 |
| 1469 /* Make sure that function is small enough to be considered for inlining. */ | |
| 111 | 1470 if (estimate_size_after_inlining (node, edge) >= limit) |
| 0 | 1471 return false; |
| 111 | 1472 lookup_recursive_calls (node, node, &heap); |
| 1473 if (heap.empty ()) | |
| 1474 return false; | |
| 0 | 1475 |
| 1476 if (dump_file) | |
|
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1477 fprintf (dump_file, |
| 0 | 1478 " Performing recursive inlining on %s\n", |
| 111 | 1479 node->name ()); |
| 0 | 1480 |
| 1481 /* Do the inlining and update list of recursive call during process. */ | |
| 111 | 1482 while (!heap.empty ()) |
| 0 | 1483 { |
| 111 | 1484 struct cgraph_edge *curr = heap.extract_min (); |
| 1485 struct cgraph_node *cnode, *dest = curr->callee; | |
| 1486 | |
| 1487 if (!can_inline_edge_p (curr, true)) | |
| 1488 continue; | |
| 1489 | |
| 1490 /* MASTER_CLONE is produced in the case we already started modified | |
| 1491 the function. Be sure to redirect edge to the original body before | |
| 1492 estimating growths otherwise we will be seeing growths after inlining | |
| 1493 the already modified body. */ | |
| 1494 if (master_clone) | |
| 1495 { | |
| 1496 curr->redirect_callee (master_clone); | |
| 1497 reset_edge_growth_cache (curr); | |
| 1498 } | |
| 1499 | |
| 1500 if (estimate_size_after_inlining (node, curr) > limit) | |
| 1501 { | |
| 1502 curr->redirect_callee (dest); | |
| 1503 reset_edge_growth_cache (curr); | |
| 1504 break; | |
| 1505 } | |
| 0 | 1506 |
| 1507 depth = 1; | |
| 1508 for (cnode = curr->caller; | |
| 1509 cnode->global.inlined_to; cnode = cnode->callers->caller) | |
| 111 | 1510 if (node->decl |
| 1511 == curr->callee->ultimate_alias_target ()->decl) | |
| 1512 depth++; | |
| 0 | 1513 |
| 111 | 1514 if (!want_inline_self_recursive_call_p (curr, node, false, depth)) |
| 0 | 1515 { |
| 111 | 1516 curr->redirect_callee (dest); |
| 1517 reset_edge_growth_cache (curr); | |
| 1518 continue; | |
| 0 | 1519 } |
| 1520 | |
| 1521 if (dump_file) | |
| 1522 { | |
|
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1523 fprintf (dump_file, |
| 0 | 1524 " Inlining call of depth %i", depth); |
| 111 | 1525 if (node->count > profile_count::zero ()) |
| 0 | 1526 { |
| 1527 fprintf (dump_file, " called approx. %.2f times per call", | |
| 111 | 1528 (double)curr->count.to_gcov_type () |
| 1529 / node->count.to_gcov_type ()); | |
| 0 | 1530 } |
| 1531 fprintf (dump_file, "\n"); | |
| 1532 } | |
| 111 | 1533 if (!master_clone) |
| 1534 { | |
| 1535 /* We need original clone to copy around. */ | |
| 1536 master_clone = node->create_clone (node->decl, node->count, | |
| 1537 CGRAPH_FREQ_BASE, false, vNULL, | |
| 1538 true, NULL, NULL); | |
| 1539 for (e = master_clone->callees; e; e = e->next_callee) | |
| 1540 if (!e->inline_failed) | |
| 1541 clone_inlined_nodes (e, true, false, NULL, CGRAPH_FREQ_BASE); | |
| 1542 curr->redirect_callee (master_clone); | |
| 1543 reset_edge_growth_cache (curr); | |
| 1544 } | |
| 1545 | |
| 1546 inline_call (curr, false, new_edges, &overall_size, true); | |
| 1547 lookup_recursive_calls (node, curr->callee, &heap); | |
| 0 | 1548 n++; |
| 1549 } | |
| 111 | 1550 |
| 1551 if (!heap.empty () && dump_file) | |
| 0 | 1552 fprintf (dump_file, " Recursive inlining growth limit met.\n"); |
| 1553 | |
| 111 | 1554 if (!master_clone) |
| 1555 return false; | |
| 1556 | |
| 0 | 1557 if (dump_file) |
|
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1558 fprintf (dump_file, |
| 111 | 1559 "\n Inlined %i times, " |
| 1560 "body grown from size %i to %i, time %f to %f\n", n, | |
| 1561 ipa_fn_summaries->get (master_clone)->size, | |
| 1562 ipa_fn_summaries->get (node)->size, | |
| 1563 ipa_fn_summaries->get (master_clone)->time.to_double (), | |
| 1564 ipa_fn_summaries->get (node)->time.to_double ()); | |
| 0 | 1565 |
| 1566 /* Remove master clone we used for inlining. We rely that clones inlined | |
| 1567 into master clone gets queued just before master clone so we don't | |
| 1568 need recursion. */ | |
| 111 | 1569 for (node = symtab->first_function (); node != master_clone; |
| 0 | 1570 node = next) |
| 1571 { | |
| 111 | 1572 next = symtab->next_function (node); |
| 0 | 1573 if (node->global.inlined_to == master_clone) |
| 111 | 1574 node->remove (); |
| 0 | 1575 } |
| 111 | 1576 master_clone->remove (); |
| 1577 return true; | |
| 0 | 1578 } |
| 1579 | |
| 1580 | |
| 1581 /* Given whole compilation unit estimate of INSNS, compute how large we can | |
| 1582 allow the unit to grow. */ | |
| 111 | 1583 |
| 0 | 1584 static int |
| 1585 compute_max_insns (int insns) | |
| 1586 { | |
| 1587 int max_insns = insns; | |
| 1588 if (max_insns < PARAM_VALUE (PARAM_LARGE_UNIT_INSNS)) | |
| 1589 max_insns = PARAM_VALUE (PARAM_LARGE_UNIT_INSNS); | |
| 1590 | |
| 111 | 1591 return ((int64_t) max_insns |
| 0 | 1592 * (100 + PARAM_VALUE (PARAM_INLINE_UNIT_GROWTH)) / 100); |
| 1593 } | |
| 1594 | |
| 111 | 1595 |
| 0 | 1596 /* Compute badness of all edges in NEW_EDGES and add them to the HEAP. */ |
| 111 | 1597 |
| 0 | 1598 static void |
| 111 | 1599 add_new_edges_to_heap (edge_heap_t *heap, vec<cgraph_edge *> new_edges) |
| 0 | 1600 { |
| 111 | 1601 while (new_edges.length () > 0) |
| 0 | 1602 { |
| 111 | 1603 struct cgraph_edge *edge = new_edges.pop (); |
| 0 | 1604 |
| 1605 gcc_assert (!edge->aux); | |
| 111 | 1606 if (edge->inline_failed |
| 1607 && can_inline_edge_p (edge, true) | |
| 1608 && want_inline_small_function_p (edge, true)) | |
| 1609 edge->aux = heap->insert (edge_badness (edge, false), edge); | |
| 1610 } | |
| 1611 } | |
| 1612 | |
| 1613 /* Remove EDGE from the fibheap. */ | |
| 1614 | |
| 1615 static void | |
| 1616 heap_edge_removal_hook (struct cgraph_edge *e, void *data) | |
| 1617 { | |
| 1618 if (e->aux) | |
| 1619 { | |
| 1620 ((edge_heap_t *)data)->delete_node ((edge_heap_node_t *)e->aux); | |
| 1621 e->aux = NULL; | |
| 0 | 1622 } |
| 1623 } | |
| 1624 | |
| 111 | 1625 /* Return true if speculation of edge E seems useful. |
| 1626 If ANTICIPATE_INLINING is true, be conservative and hope that E | |
| 1627 may get inlined. */ | |
| 1628 | |
| 1629 bool | |
| 1630 speculation_useful_p (struct cgraph_edge *e, bool anticipate_inlining) | |
| 1631 { | |
| 1632 enum availability avail; | |
| 1633 struct cgraph_node *target = e->callee->ultimate_alias_target (&avail, | |
| 1634 e->caller); | |
| 1635 struct cgraph_edge *direct, *indirect; | |
| 1636 struct ipa_ref *ref; | |
| 1637 | |
| 1638 gcc_assert (e->speculative && !e->indirect_unknown_callee); | |
| 1639 | |
| 1640 if (!e->maybe_hot_p ()) | |
| 1641 return false; | |
| 1642 | |
| 1643 /* See if IP optimizations found something potentially useful about the | |
| 1644 function. For now we look only for CONST/PURE flags. Almost everything | |
| 1645 else we propagate is useless. */ | |
| 1646 if (avail >= AVAIL_AVAILABLE) | |
| 1647 { | |
| 1648 int ecf_flags = flags_from_decl_or_type (target->decl); | |
| 1649 if (ecf_flags & ECF_CONST) | |
| 1650 { | |
| 1651 e->speculative_call_info (direct, indirect, ref); | |
| 1652 if (!(indirect->indirect_info->ecf_flags & ECF_CONST)) | |
| 1653 return true; | |
| 1654 } | |
| 1655 else if (ecf_flags & ECF_PURE) | |
| 1656 { | |
| 1657 e->speculative_call_info (direct, indirect, ref); | |
| 1658 if (!(indirect->indirect_info->ecf_flags & ECF_PURE)) | |
| 1659 return true; | |
| 1660 } | |
| 1661 } | |
| 1662 /* If we did not managed to inline the function nor redirect | |
| 1663 to an ipa-cp clone (that are seen by having local flag set), | |
| 1664 it is probably pointless to inline it unless hardware is missing | |
| 1665 indirect call predictor. */ | |
| 1666 if (!anticipate_inlining && e->inline_failed && !target->local.local) | |
| 1667 return false; | |
| 1668 /* For overwritable targets there is not much to do. */ | |
| 1669 if (e->inline_failed && !can_inline_edge_p (e, false, true)) | |
| 1670 return false; | |
| 1671 /* OK, speculation seems interesting. */ | |
| 1672 return true; | |
| 1673 } | |
| 1674 | |
| 1675 /* We know that EDGE is not going to be inlined. | |
| 1676 See if we can remove speculation. */ | |
| 1677 | |
| 1678 static void | |
| 1679 resolve_noninline_speculation (edge_heap_t *edge_heap, struct cgraph_edge *edge) | |
| 1680 { | |
| 1681 if (edge->speculative && !speculation_useful_p (edge, false)) | |
| 1682 { | |
| 1683 struct cgraph_node *node = edge->caller; | |
| 1684 struct cgraph_node *where = node->global.inlined_to | |
| 1685 ? node->global.inlined_to : node; | |
| 1686 auto_bitmap updated_nodes; | |
| 1687 | |
| 1688 spec_rem += edge->count; | |
| 1689 edge->resolve_speculation (); | |
| 1690 reset_edge_caches (where); | |
| 1691 ipa_update_overall_fn_summary (where); | |
| 1692 update_caller_keys (edge_heap, where, | |
| 1693 updated_nodes, NULL); | |
| 1694 update_callee_keys (edge_heap, where, | |
| 1695 updated_nodes); | |
| 1696 } | |
| 1697 } | |
| 1698 | |
| 1699 /* Return true if NODE should be accounted for overall size estimate. | |
| 1700 Skip all nodes optimized for size so we can measure the growth of hot | |
| 1701 part of program no matter of the padding. */ | |
| 1702 | |
| 1703 bool | |
| 1704 inline_account_function_p (struct cgraph_node *node) | |
| 1705 { | |
| 1706 return (!DECL_EXTERNAL (node->decl) | |
| 1707 && !opt_for_fn (node->decl, optimize_size) | |
| 1708 && node->frequency != NODE_FREQUENCY_UNLIKELY_EXECUTED); | |
| 1709 } | |
| 1710 | |
| 1711 /* Count number of callers of NODE and store it into DATA (that | |
| 1712 points to int. Worker for cgraph_for_node_and_aliases. */ | |
| 1713 | |
| 1714 static bool | |
| 1715 sum_callers (struct cgraph_node *node, void *data) | |
| 1716 { | |
| 1717 struct cgraph_edge *e; | |
| 1718 int *num_calls = (int *)data; | |
| 1719 | |
| 1720 for (e = node->callers; e; e = e->next_caller) | |
| 1721 (*num_calls)++; | |
| 1722 return false; | |
| 1723 } | |
| 0 | 1724 |
| 1725 /* We use greedy algorithm for inlining of small functions: | |
| 111 | 1726 All inline candidates are put into prioritized heap ordered in |
| 1727 increasing badness. | |
| 0 | 1728 |
| 111 | 1729 The inlining of small functions is bounded by unit growth parameters. */ |
| 0 | 1730 |
| 1731 static void | |
| 111 | 1732 inline_small_functions (void) |
| 0 | 1733 { |
| 1734 struct cgraph_node *node; | |
| 1735 struct cgraph_edge *edge; | |
| 111 | 1736 edge_heap_t edge_heap (sreal::min ()); |
| 1737 auto_bitmap updated_nodes; | |
|
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1738 int min_size, max_size; |
| 111 | 1739 auto_vec<cgraph_edge *> new_indirect_edges; |
| 1740 int initial_size = 0; | |
| 1741 struct cgraph_node **order = XCNEWVEC (cgraph_node *, symtab->cgraph_count); | |
| 1742 struct cgraph_edge_hook_list *edge_removal_hook_holder; | |
| 1743 new_indirect_edges.create (8); | |
| 1744 | |
| 1745 edge_removal_hook_holder | |
| 1746 = symtab->add_edge_removal_hook (&heap_edge_removal_hook, &edge_heap); | |
| 1747 | |
| 1748 /* Compute overall unit size and other global parameters used by badness | |
| 1749 metrics. */ | |
| 1750 | |
| 1751 max_count = profile_count::uninitialized (); | |
| 1752 ipa_reduced_postorder (order, true, true, NULL); | |
| 1753 free (order); | |
| 1754 | |
| 1755 FOR_EACH_DEFINED_FUNCTION (node) | |
| 1756 if (!node->global.inlined_to) | |
| 1757 { | |
| 1758 if (!node->alias && node->analyzed | |
| 1759 && (node->has_gimple_body_p () || node->thunk.thunk_p) | |
| 1760 && opt_for_fn (node->decl, optimize)) | |
| 1761 { | |
| 1762 struct ipa_fn_summary *info = ipa_fn_summaries->get (node); | |
| 1763 struct ipa_dfs_info *dfs = (struct ipa_dfs_info *) node->aux; | |
| 0 | 1764 |
| 111 | 1765 /* Do not account external functions, they will be optimized out |
| 1766 if not inlined. Also only count the non-cold portion of program. */ | |
| 1767 if (inline_account_function_p (node)) | |
| 1768 initial_size += info->size; | |
| 1769 info->growth = estimate_growth (node); | |
| 1770 | |
| 1771 int num_calls = 0; | |
| 1772 node->call_for_symbol_and_aliases (sum_callers, &num_calls, | |
| 1773 true); | |
| 1774 if (num_calls == 1) | |
| 1775 info->single_caller = true; | |
| 1776 if (dfs && dfs->next_cycle) | |
| 1777 { | |
| 1778 struct cgraph_node *n2; | |
| 1779 int id = dfs->scc_no + 1; | |
| 1780 for (n2 = node; n2; | |
| 1781 n2 = ((struct ipa_dfs_info *) node->aux)->next_cycle) | |
| 1782 if (opt_for_fn (n2->decl, optimize)) | |
| 1783 { | |
| 1784 struct ipa_fn_summary *info2 = ipa_fn_summaries->get (n2); | |
| 1785 if (info2->scc_no) | |
| 1786 break; | |
| 1787 info2->scc_no = id; | |
| 1788 } | |
| 1789 } | |
| 1790 } | |
| 1791 | |
| 1792 for (edge = node->callers; edge; edge = edge->next_caller) | |
| 1793 if (!(max_count >= edge->count)) | |
| 1794 max_count = edge->count; | |
| 1795 } | |
| 1796 ipa_free_postorder_info (); | |
| 1797 initialize_growth_caches (); | |
| 0 | 1798 |
| 1799 if (dump_file) | |
| 111 | 1800 fprintf (dump_file, |
| 1801 "\nDeciding on inlining of small functions. Starting with size %i.\n", | |
| 1802 initial_size); | |
| 0 | 1803 |
| 111 | 1804 overall_size = initial_size; |
|
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1805 max_size = compute_max_insns (overall_size); |
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1806 min_size = overall_size; |
| 0 | 1807 |
| 111 | 1808 /* Populate the heap with all edges we might inline. */ |
| 1809 | |
| 1810 FOR_EACH_DEFINED_FUNCTION (node) | |
| 1811 { | |
| 1812 bool update = false; | |
| 1813 struct cgraph_edge *next = NULL; | |
| 1814 bool has_speculative = false; | |
| 1815 | |
| 1816 if (!opt_for_fn (node->decl, optimize)) | |
| 1817 continue; | |
| 1818 | |
| 1819 if (dump_file) | |
| 1820 fprintf (dump_file, "Enqueueing calls in %s.\n", node->dump_name ()); | |
| 1821 | |
| 1822 for (edge = node->callees; edge; edge = next) | |
| 1823 { | |
| 1824 next = edge->next_callee; | |
| 1825 if (edge->inline_failed | |
| 1826 && !edge->aux | |
| 1827 && can_inline_edge_p (edge, true) | |
| 1828 && want_inline_small_function_p (edge, true) | |
| 1829 && edge->inline_failed) | |
| 1830 { | |
| 1831 gcc_assert (!edge->aux); | |
| 1832 update_edge_key (&edge_heap, edge); | |
| 1833 } | |
| 1834 if (edge->speculative) | |
| 1835 has_speculative = true; | |
| 1836 } | |
| 1837 if (has_speculative) | |
| 1838 for (edge = node->callees; edge; edge = next) | |
| 1839 if (edge->speculative && !speculation_useful_p (edge, | |
| 1840 edge->aux != NULL)) | |
| 1841 { | |
| 1842 edge->resolve_speculation (); | |
| 1843 update = true; | |
| 1844 } | |
| 1845 if (update) | |
| 1846 { | |
| 1847 struct cgraph_node *where = node->global.inlined_to | |
| 1848 ? node->global.inlined_to : node; | |
| 1849 ipa_update_overall_fn_summary (where); | |
| 1850 reset_edge_caches (where); | |
| 1851 update_caller_keys (&edge_heap, where, | |
| 1852 updated_nodes, NULL); | |
| 1853 update_callee_keys (&edge_heap, where, | |
| 1854 updated_nodes); | |
| 1855 bitmap_clear (updated_nodes); | |
| 1856 } | |
| 1857 } | |
| 1858 | |
| 1859 gcc_assert (in_lto_p | |
| 1860 || !(max_count > 0) | |
| 1861 || (profile_info && flag_branch_probabilities)); | |
| 1862 | |
| 1863 while (!edge_heap.empty ()) | |
| 0 | 1864 { |
|
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1865 int old_size = overall_size; |
|
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1866 struct cgraph_node *where, *callee; |
| 111 | 1867 sreal badness = edge_heap.min_key (); |
| 1868 sreal current_badness; | |
|
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1869 int growth; |
| 0 | 1870 |
| 111 | 1871 edge = edge_heap.extract_min (); |
|
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1872 gcc_assert (edge->aux); |
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1873 edge->aux = NULL; |
| 111 | 1874 if (!edge->inline_failed || !edge->callee->analyzed) |
|
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1875 continue; |
|
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1876 |
| 111 | 1877 #if CHECKING_P |
| 1878 /* Be sure that caches are maintained consistent. */ | |
| 1879 sreal cached_badness = edge_badness (edge, false); | |
| 1880 | |
| 1881 int old_size_est = estimate_edge_size (edge); | |
| 1882 sreal old_time_est = estimate_edge_time (edge); | |
| 1883 int old_hints_est = estimate_edge_hints (edge); | |
| 1884 | |
| 1885 reset_edge_growth_cache (edge); | |
| 1886 gcc_assert (old_size_est == estimate_edge_size (edge)); | |
| 1887 gcc_assert (old_time_est == estimate_edge_time (edge)); | |
| 1888 /* FIXME: | |
| 1889 | |
| 1890 gcc_assert (old_hints_est == estimate_edge_hints (edge)); | |
| 1891 | |
| 1892 fails with profile feedback because some hints depends on | |
| 1893 maybe_hot_edge_p predicate and because callee gets inlined to other | |
| 1894 calls, the edge may become cold. | |
| 1895 This ought to be fixed by computing relative probabilities | |
| 1896 for given invocation but that will be better done once whole | |
| 1897 code is converted to sreals. Disable for now and revert to "wrong" | |
| 1898 value so enable/disable checking paths agree. */ | |
| 1899 edge_growth_cache[edge->uid].hints = old_hints_est + 1; | |
| 1900 | |
|
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1901 /* When updating the edge costs, we only decrease badness in the keys. |
| 111 | 1902 Increases of badness are handled lazilly; when we see key with out |
| 1903 of date value on it, we re-insert it now. */ | |
| 1904 current_badness = edge_badness (edge, false); | |
| 1905 gcc_assert (cached_badness == current_badness); | |
|
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1906 gcc_assert (current_badness >= badness); |
| 111 | 1907 #else |
| 1908 current_badness = edge_badness (edge, false); | |
| 1909 #endif | |
|
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1910 if (current_badness != badness) |
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1911 { |
| 111 | 1912 if (edge_heap.min () && current_badness > edge_heap.min_key ()) |
| 1913 { | |
| 1914 edge->aux = edge_heap.insert (current_badness, edge); | |
| 1915 continue; | |
| 1916 } | |
| 1917 else | |
| 1918 badness = current_badness; | |
| 1919 } | |
| 1920 | |
| 1921 if (!can_inline_edge_p (edge, true)) | |
| 1922 { | |
| 1923 resolve_noninline_speculation (&edge_heap, edge); | |
|
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1924 continue; |
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1925 } |
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1926 |
| 111 | 1927 callee = edge->callee->ultimate_alias_target (); |
| 1928 growth = estimate_edge_growth (edge); | |
| 0 | 1929 if (dump_file) |
| 1930 { | |
|
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1931 fprintf (dump_file, |
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1932 "\nConsidering %s with %i size\n", |
| 111 | 1933 callee->dump_name (), |
| 1934 ipa_fn_summaries->get (callee)->size); | |
|
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1935 fprintf (dump_file, |
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1936 " to be inlined into %s in %s:%i\n" |
| 111 | 1937 " Estimated badness is %f, frequency %.2f.\n", |
| 1938 edge->caller->dump_name (), | |
| 1939 edge->call_stmt | |
| 1940 && (LOCATION_LOCUS (gimple_location ((const gimple *) | |
| 1941 edge->call_stmt)) | |
| 1942 > BUILTINS_LOCATION) | |
| 1943 ? gimple_filename ((const gimple *) edge->call_stmt) | |
| 1944 : "unknown", | |
| 1945 edge->call_stmt | |
| 1946 ? gimple_lineno ((const gimple *) edge->call_stmt) | |
| 1947 : -1, | |
| 1948 badness.to_double (), | |
| 0 | 1949 edge->frequency / (double)CGRAPH_FREQ_BASE); |
| 111 | 1950 if (edge->count.initialized_p ()) |
| 1951 { | |
| 1952 fprintf (dump_file, " Called "); | |
| 1953 edge->count.dump (dump_file); | |
| 1954 fprintf (dump_file, "times\n"); | |
| 1955 } | |
|
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1956 if (dump_flags & TDF_DETAILS) |
| 111 | 1957 edge_badness (edge, true); |
| 0 | 1958 } |
| 1959 | |
| 111 | 1960 if (overall_size + growth > max_size |
| 1961 && !DECL_DISREGARD_INLINE_LIMITS (callee->decl)) | |
| 0 | 1962 { |
| 111 | 1963 edge->inline_failed = CIF_INLINE_UNIT_GROWTH_LIMIT; |
| 1964 report_inline_failed_reason (edge); | |
| 1965 resolve_noninline_speculation (&edge_heap, edge); | |
| 1966 continue; | |
| 0 | 1967 } |
| 1968 | |
| 111 | 1969 if (!want_inline_small_function_p (edge, true)) |
| 0 | 1970 { |
| 111 | 1971 resolve_noninline_speculation (&edge_heap, edge); |
| 0 | 1972 continue; |
| 1973 } | |
| 111 | 1974 |
| 1975 /* Heuristics for inlining small functions work poorly for | |
| 1976 recursive calls where we do effects similar to loop unrolling. | |
| 1977 When inlining such edge seems profitable, leave decision on | |
| 1978 specific inliner. */ | |
| 1979 if (edge->recursive_p ()) | |
| 0 | 1980 { |
| 1981 where = edge->caller; | |
| 1982 if (where->global.inlined_to) | |
| 1983 where = where->global.inlined_to; | |
| 111 | 1984 if (!recursive_inlining (edge, |
| 1985 opt_for_fn (edge->caller->decl, | |
| 1986 flag_indirect_inlining) | |
| 1987 ? &new_indirect_edges : NULL)) | |
| 1988 { | |
| 1989 edge->inline_failed = CIF_RECURSIVE_INLINING; | |
| 1990 resolve_noninline_speculation (&edge_heap, edge); | |
| 1991 continue; | |
| 1992 } | |
| 1993 reset_edge_caches (where); | |
| 1994 /* Recursive inliner inlines all recursive calls of the function | |
| 1995 at once. Consequently we need to update all callee keys. */ | |
| 1996 if (opt_for_fn (edge->caller->decl, flag_indirect_inlining)) | |
| 1997 add_new_edges_to_heap (&edge_heap, new_indirect_edges); | |
| 1998 update_callee_keys (&edge_heap, where, updated_nodes); | |
| 1999 bitmap_clear (updated_nodes); | |
| 0 | 2000 } |
| 2001 else | |
| 2002 { | |
| 111 | 2003 struct cgraph_node *outer_node = NULL; |
| 2004 int depth = 0; | |
| 2005 | |
| 2006 /* Consider the case where self recursive function A is inlined | |
| 2007 into B. This is desired optimization in some cases, since it | |
| 2008 leads to effect similar of loop peeling and we might completely | |
| 2009 optimize out the recursive call. However we must be extra | |
| 2010 selective. */ | |
| 2011 | |
| 2012 where = edge->caller; | |
| 2013 while (where->global.inlined_to) | |
| 0 | 2014 { |
| 111 | 2015 if (where->decl == callee->decl) |
| 2016 outer_node = where, depth++; | |
| 2017 where = where->callers->caller; | |
| 2018 } | |
| 2019 if (outer_node | |
| 2020 && !want_inline_self_recursive_call_p (edge, outer_node, | |
| 2021 true, depth)) | |
| 2022 { | |
| 2023 edge->inline_failed | |
| 2024 = (DECL_DISREGARD_INLINE_LIMITS (edge->callee->decl) | |
| 2025 ? CIF_RECURSIVE_INLINING : CIF_UNSPECIFIED); | |
| 2026 resolve_noninline_speculation (&edge_heap, edge); | |
| 0 | 2027 continue; |
| 2028 } | |
| 111 | 2029 else if (depth && dump_file) |
| 2030 fprintf (dump_file, " Peeling recursion with depth %i\n", depth); | |
| 0 | 2031 |
| 111 | 2032 gcc_checking_assert (!callee->global.inlined_to); |
| 2033 inline_call (edge, true, &new_indirect_edges, &overall_size, true); | |
| 2034 add_new_edges_to_heap (&edge_heap, new_indirect_edges); | |
| 2035 | |
| 2036 reset_edge_caches (edge->callee); | |
| 2037 | |
| 2038 update_callee_keys (&edge_heap, where, updated_nodes); | |
| 0 | 2039 } |
| 2040 where = edge->caller; | |
| 2041 if (where->global.inlined_to) | |
| 2042 where = where->global.inlined_to; | |
| 2043 | |
| 2044 /* Our profitability metric can depend on local properties | |
| 2045 such as number of inlinable calls and size of the function body. | |
| 2046 After inlining these properties might change for the function we | |
| 2047 inlined into (since it's body size changed) and for the functions | |
| 2048 called by function we inlined (since number of it inlinable callers | |
| 2049 might change). */ | |
| 111 | 2050 update_caller_keys (&edge_heap, where, updated_nodes, NULL); |
| 2051 /* Offline copy count has possibly changed, recompute if profile is | |
| 2052 available. */ | |
| 2053 if (max_count > profile_count::zero ()) | |
| 2054 { | |
| 2055 struct cgraph_node *n = cgraph_node::get (edge->callee->decl); | |
| 2056 if (n != edge->callee && n->analyzed) | |
| 2057 update_callee_keys (&edge_heap, n, updated_nodes); | |
| 2058 } | |
| 0 | 2059 bitmap_clear (updated_nodes); |
| 2060 | |
| 2061 if (dump_file) | |
| 2062 { | |
|
55
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update it from 4.4.3 to 4.5.0
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0
diff
changeset
|
2063 fprintf (dump_file, |
| 111 | 2064 " Inlined %s into %s which now has time %f and size %i, " |
|
55
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diff
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|
2065 "net change of %+i.\n", |
| 111 | 2066 xstrdup_for_dump (edge->callee->name ()), |
| 2067 xstrdup_for_dump (edge->caller->name ()), | |
| 2068 ipa_fn_summaries->get (edge->caller)->time.to_double (), | |
| 2069 ipa_fn_summaries->get (edge->caller)->size, | |
|
55
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diff
changeset
|
2070 overall_size - old_size); |
| 0 | 2071 } |
|
55
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|
2072 if (min_size > overall_size) |
| 0 | 2073 { |
|
55
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update it from 4.4.3 to 4.5.0
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0
diff
changeset
|
2074 min_size = overall_size; |
|
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diff
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|
2075 max_size = compute_max_insns (min_size); |
| 0 | 2076 |
| 2077 if (dump_file) | |
|
55
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diff
changeset
|
2078 fprintf (dump_file, "New minimal size reached: %i\n", min_size); |
| 0 | 2079 } |
| 2080 } | |
|
63
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diff
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|
2081 |
| 111 | 2082 free_growth_caches (); |
| 2083 if (dump_file) | |
| 2084 fprintf (dump_file, | |
| 2085 "Unit growth for small function inlining: %i->%i (%i%%)\n", | |
| 2086 initial_size, overall_size, | |
| 2087 initial_size ? overall_size * 100 / (initial_size) - 100: 0); | |
| 2088 symtab->remove_edge_removal_hook (edge_removal_hook_holder); | |
| 0 | 2089 } |
| 2090 | |
| 111 | 2091 /* Flatten NODE. Performed both during early inlining and |
| 2092 at IPA inlining time. */ | |
|
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diff
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|
2093 |
|
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diff
changeset
|
2094 static void |
| 111 | 2095 flatten_function (struct cgraph_node *node, bool early) |
|
63
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diff
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|
2096 { |
|
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parents:
55
diff
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|
2097 struct cgraph_edge *e; |
|
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diff
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|
2098 |
|
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diff
changeset
|
2099 /* We shouldn't be called recursively when we are being processed. */ |
|
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parents:
55
diff
changeset
|
2100 gcc_assert (node->aux == NULL); |
|
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diff
changeset
|
2101 |
| 111 | 2102 node->aux = (void *) node; |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
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diff
changeset
|
2103 |
|
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parents:
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diff
changeset
|
2104 for (e = node->callees; e; e = e->next_callee) |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2105 { |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
2106 struct cgraph_node *orig_callee; |
| 111 | 2107 struct cgraph_node *callee = e->callee->ultimate_alias_target (); |
|
63
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parents:
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diff
changeset
|
2108 |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2109 /* We've hit cycle? It is time to give up. */ |
| 111 | 2110 if (callee->aux) |
|
63
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diff
changeset
|
2111 { |
|
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parents:
55
diff
changeset
|
2112 if (dump_file) |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2113 fprintf (dump_file, |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2114 "Not inlining %s into %s to avoid cycle.\n", |
| 111 | 2115 xstrdup_for_dump (callee->name ()), |
| 2116 xstrdup_for_dump (e->caller->name ())); | |
|
63
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diff
changeset
|
2117 e->inline_failed = CIF_RECURSIVE_INLINING; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2118 continue; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
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|
2119 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
2120 |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2121 /* When the edge is already inlined, we just need to recurse into |
|
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parents:
55
diff
changeset
|
2122 it in order to fully flatten the leaves. */ |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
2123 if (!e->inline_failed) |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
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|
2124 { |
| 111 | 2125 flatten_function (callee, early); |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
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diff
changeset
|
2126 continue; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
2127 } |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
2128 |
| 111 | 2129 /* Flatten attribute needs to be processed during late inlining. For |
| 2130 extra code quality we however do flattening during early optimization, | |
| 2131 too. */ | |
| 2132 if (!early | |
| 2133 ? !can_inline_edge_p (e, true) | |
| 2134 : !can_early_inline_edge_p (e)) | |
| 2135 continue; | |
| 2136 | |
| 2137 if (e->recursive_p ()) | |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
2138 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2139 if (dump_file) |
|
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2140 fprintf (dump_file, "Not inlining: recursive call.\n"); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2141 continue; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2142 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2143 |
|
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
|
2144 if (gimple_in_ssa_p (DECL_STRUCT_FUNCTION (node->decl)) |
| 111 | 2145 != gimple_in_ssa_p (DECL_STRUCT_FUNCTION (callee->decl))) |
|
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
|
2146 { |
|
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
|
2147 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
|
2148 fprintf (dump_file, "Not inlining: SSA form does not match.\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
|
2149 continue; |
|
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
|
2150 } |
|
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
|
2151 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2152 /* Inline the edge and flatten the inline clone. Avoid |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2153 recursing through the original node if the node was cloned. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2154 if (dump_file) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2155 fprintf (dump_file, " Inlining %s into %s.\n", |
| 111 | 2156 xstrdup_for_dump (callee->name ()), |
| 2157 xstrdup_for_dump (e->caller->name ())); | |
| 2158 orig_callee = callee; | |
| 2159 inline_call (e, true, NULL, NULL, false); | |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2160 if (e->callee != orig_callee) |
| 111 | 2161 orig_callee->aux = (void *) node; |
| 2162 flatten_function (e->callee, early); | |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2163 if (e->callee != orig_callee) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2164 orig_callee->aux = NULL; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2165 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
2166 |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
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|
2167 node->aux = NULL; |
| 111 | 2168 if (!node->global.inlined_to) |
| 2169 ipa_update_overall_fn_summary (node); | |
| 2170 } | |
| 2171 | |
| 2172 /* Inline NODE to all callers. Worker for cgraph_for_node_and_aliases. | |
| 2173 DATA points to number of calls originally found so we avoid infinite | |
| 2174 recursion. */ | |
| 2175 | |
| 2176 static bool | |
| 2177 inline_to_all_callers_1 (struct cgraph_node *node, void *data, | |
| 2178 hash_set<cgraph_node *> *callers) | |
| 2179 { | |
| 2180 int *num_calls = (int *)data; | |
| 2181 bool callee_removed = false; | |
| 123 | 2182 #ifndef noCbC |
| 124 | 2183 bool tail_call_f = false; |
| 2184 if (node->callees) { | |
| 2185 if (node->callees->call_stmt) { | |
| 2186 if (node->callees->call_stmt->vdef) | |
| 2187 tail_call_f = gimple_call_tail_p (as_a <gcall *> (node->callees->call_stmt->vdef->ssa_name.def_stmt)); | |
| 2188 } | |
| 2189 } | |
| 2190 while (node->callers && !node->global.inlined_to && !tail_call_f) | |
| 123 | 2191 { |
| 2192 #else | |
| 111 | 2193 while (node->callers && !node->global.inlined_to) |
| 2194 { | |
| 123 | 2195 #endif |
| 111 | 2196 struct cgraph_node *caller = node->callers->caller; |
| 2197 | |
| 2198 if (!can_inline_edge_p (node->callers, true) | |
| 2199 || node->callers->recursive_p ()) | |
| 2200 { | |
| 2201 if (dump_file) | |
| 2202 fprintf (dump_file, "Uninlinable call found; giving up.\n"); | |
| 2203 *num_calls = 0; | |
| 2204 return false; | |
| 2205 } | |
| 2206 | |
| 2207 if (dump_file) | |
| 2208 { | |
| 2209 fprintf (dump_file, | |
| 2210 "\nInlining %s size %i.\n", | |
| 2211 node->name (), | |
| 2212 ipa_fn_summaries->get (node)->size); | |
| 2213 fprintf (dump_file, | |
| 2214 " Called once from %s %i insns.\n", | |
| 2215 node->callers->caller->name (), | |
| 2216 ipa_fn_summaries->get (node->callers->caller)->size); | |
| 2217 } | |
| 2218 /* Remember which callers we inlined to, delaying updating the | |
| 2219 overall summary. */ | |
| 2220 callers->add (node->callers->caller); | |
| 2221 inline_call (node->callers, true, NULL, NULL, false, &callee_removed); | |
| 2222 if (dump_file) | |
| 2223 fprintf (dump_file, | |
| 2224 " Inlined into %s which now has %i size\n", | |
| 2225 caller->name (), | |
| 2226 ipa_fn_summaries->get (caller)->size); | |
| 2227 if (!(*num_calls)--) | |
| 2228 { | |
| 2229 if (dump_file) | |
| 2230 fprintf (dump_file, "New calls found; giving up.\n"); | |
| 2231 return callee_removed; | |
| 2232 } | |
| 2233 if (callee_removed) | |
| 2234 return true; | |
| 2235 } | |
| 2236 return false; | |
| 2237 } | |
| 2238 | |
| 2239 /* Wrapper around inline_to_all_callers_1 doing delayed overall summary | |
| 2240 update. */ | |
| 2241 | |
| 2242 static bool | |
| 2243 inline_to_all_callers (struct cgraph_node *node, void *data) | |
| 2244 { | |
| 2245 hash_set<cgraph_node *> callers; | |
| 2246 bool res = inline_to_all_callers_1 (node, data, &callers); | |
| 2247 /* Perform the delayed update of the overall summary of all callers | |
| 2248 processed. This avoids quadratic behavior in the cases where | |
| 2249 we have a lot of calls to the same function. */ | |
| 2250 for (hash_set<cgraph_node *>::iterator i = callers.begin (); | |
| 2251 i != callers.end (); ++i) | |
| 2252 ipa_update_overall_fn_summary (*i); | |
| 2253 return res; | |
| 2254 } | |
| 2255 | |
| 2256 /* Output overall time estimate. */ | |
| 2257 static void | |
| 2258 dump_overall_stats (void) | |
| 2259 { | |
| 2260 sreal sum_weighted = 0, sum = 0; | |
| 2261 struct cgraph_node *node; | |
| 2262 | |
| 2263 FOR_EACH_DEFINED_FUNCTION (node) | |
| 2264 if (!node->global.inlined_to | |
| 2265 && !node->alias) | |
| 2266 { | |
| 2267 sreal time = ipa_fn_summaries->get (node)->time; | |
| 2268 sum += time; | |
| 2269 if (node->count.initialized_p ()) | |
| 2270 sum_weighted += time * node->count.to_gcov_type (); | |
| 2271 } | |
| 2272 fprintf (dump_file, "Overall time estimate: " | |
| 2273 "%f weighted by profile: " | |
| 2274 "%f\n", sum.to_double (), sum_weighted.to_double ()); | |
| 2275 } | |
| 2276 | |
| 2277 /* Output some useful stats about inlining. */ | |
| 2278 | |
| 2279 static void | |
| 2280 dump_inline_stats (void) | |
| 2281 { | |
| 2282 int64_t inlined_cnt = 0, inlined_indir_cnt = 0; | |
| 2283 int64_t inlined_virt_cnt = 0, inlined_virt_indir_cnt = 0; | |
| 2284 int64_t noninlined_cnt = 0, noninlined_indir_cnt = 0; | |
| 2285 int64_t noninlined_virt_cnt = 0, noninlined_virt_indir_cnt = 0; | |
| 2286 int64_t inlined_speculative = 0, inlined_speculative_ply = 0; | |
| 2287 int64_t indirect_poly_cnt = 0, indirect_cnt = 0; | |
| 2288 int64_t reason[CIF_N_REASONS][3]; | |
| 2289 int i; | |
| 2290 struct cgraph_node *node; | |
| 2291 | |
| 2292 memset (reason, 0, sizeof (reason)); | |
| 2293 FOR_EACH_DEFINED_FUNCTION (node) | |
| 2294 { | |
| 2295 struct cgraph_edge *e; | |
| 2296 for (e = node->callees; e; e = e->next_callee) | |
| 2297 { | |
| 2298 if (e->inline_failed) | |
| 2299 { | |
| 2300 if (e->count.initialized_p ()) | |
| 2301 reason[(int) e->inline_failed][0] += e->count.to_gcov_type (); | |
| 2302 reason[(int) e->inline_failed][1] += e->frequency; | |
| 2303 reason[(int) e->inline_failed][2] ++; | |
| 2304 if (DECL_VIRTUAL_P (e->callee->decl) | |
| 2305 && e->count.initialized_p ()) | |
| 2306 { | |
| 2307 if (e->indirect_inlining_edge) | |
| 2308 noninlined_virt_indir_cnt += e->count.to_gcov_type (); | |
| 2309 else | |
| 2310 noninlined_virt_cnt += e->count.to_gcov_type (); | |
| 2311 } | |
| 2312 else if (e->count.initialized_p ()) | |
| 2313 { | |
| 2314 if (e->indirect_inlining_edge) | |
| 2315 noninlined_indir_cnt += e->count.to_gcov_type (); | |
| 2316 else | |
| 2317 noninlined_cnt += e->count.to_gcov_type (); | |
| 2318 } | |
| 2319 } | |
| 2320 else if (e->count.initialized_p ()) | |
| 2321 { | |
| 2322 if (e->speculative) | |
| 2323 { | |
| 2324 if (DECL_VIRTUAL_P (e->callee->decl)) | |
| 2325 inlined_speculative_ply += e->count.to_gcov_type (); | |
| 2326 else | |
| 2327 inlined_speculative += e->count.to_gcov_type (); | |
| 2328 } | |
| 2329 else if (DECL_VIRTUAL_P (e->callee->decl)) | |
| 2330 { | |
| 2331 if (e->indirect_inlining_edge) | |
| 2332 inlined_virt_indir_cnt += e->count.to_gcov_type (); | |
| 2333 else | |
| 2334 inlined_virt_cnt += e->count.to_gcov_type (); | |
| 2335 } | |
| 2336 else | |
| 2337 { | |
| 2338 if (e->indirect_inlining_edge) | |
| 2339 inlined_indir_cnt += e->count.to_gcov_type (); | |
| 2340 else | |
| 2341 inlined_cnt += e->count.to_gcov_type (); | |
| 2342 } | |
| 2343 } | |
| 2344 } | |
| 2345 for (e = node->indirect_calls; e; e = e->next_callee) | |
| 2346 if (e->indirect_info->polymorphic | |
| 2347 & e->count.initialized_p ()) | |
| 2348 indirect_poly_cnt += e->count.to_gcov_type (); | |
| 2349 else if (e->count.initialized_p ()) | |
| 2350 indirect_cnt += e->count.to_gcov_type (); | |
| 2351 } | |
| 2352 if (max_count.initialized_p ()) | |
| 2353 { | |
| 2354 fprintf (dump_file, | |
| 2355 "Inlined %" PRId64 " + speculative " | |
| 2356 "%" PRId64 " + speculative polymorphic " | |
| 2357 "%" PRId64 " + previously indirect " | |
| 2358 "%" PRId64 " + virtual " | |
| 2359 "%" PRId64 " + virtual and previously indirect " | |
| 2360 "%" PRId64 "\n" "Not inlined " | |
| 2361 "%" PRId64 " + previously indirect " | |
| 2362 "%" PRId64 " + virtual " | |
| 2363 "%" PRId64 " + virtual and previously indirect " | |
| 2364 "%" PRId64 " + stil indirect " | |
| 2365 "%" PRId64 " + still indirect polymorphic " | |
| 2366 "%" PRId64 "\n", inlined_cnt, | |
| 2367 inlined_speculative, inlined_speculative_ply, | |
| 2368 inlined_indir_cnt, inlined_virt_cnt, inlined_virt_indir_cnt, | |
| 2369 noninlined_cnt, noninlined_indir_cnt, noninlined_virt_cnt, | |
| 2370 noninlined_virt_indir_cnt, indirect_cnt, indirect_poly_cnt); | |
| 2371 fprintf (dump_file, "Removed speculations "); | |
| 2372 spec_rem.dump (dump_file); | |
| 2373 fprintf (dump_file, "\n"); | |
| 2374 } | |
| 2375 dump_overall_stats (); | |
| 2376 fprintf (dump_file, "\nWhy inlining failed?\n"); | |
| 2377 for (i = 0; i < CIF_N_REASONS; i++) | |
| 2378 if (reason[i][2]) | |
| 2379 fprintf (dump_file, "%-50s: %8i calls, %8i freq, %" PRId64" count\n", | |
| 2380 cgraph_inline_failed_string ((cgraph_inline_failed_t) i), | |
| 2381 (int) reason[i][2], (int) reason[i][1], reason[i][0]); | |
|
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|
2382 } |
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|
2383 |
| 0 | 2384 /* Decide on the inlining. We do so in the topological order to avoid |
| 2385 expenses on updating data structures. */ | |
| 2386 | |
| 2387 static unsigned int | |
| 111 | 2388 ipa_inline (void) |
| 0 | 2389 { |
| 2390 struct cgraph_node *node; | |
| 2391 int nnodes; | |
| 111 | 2392 struct cgraph_node **order; |
| 0 | 2393 int i; |
| 111 | 2394 int cold; |
| 2395 bool remove_functions = false; | |
| 0 | 2396 |
| 111 | 2397 cgraph_freq_base_rec = (sreal) 1 / (sreal) CGRAPH_FREQ_BASE; |
| 2398 percent_rec = (sreal) 1 / (sreal) 100; | |
| 0 | 2399 |
| 111 | 2400 order = XCNEWVEC (struct cgraph_node *, symtab->cgraph_count); |
| 0 | 2401 |
| 2402 if (dump_file) | |
| 111 | 2403 ipa_dump_fn_summaries (dump_file); |
| 2404 | |
| 2405 nnodes = ipa_reverse_postorder (order); | |
| 2406 | |
| 2407 FOR_EACH_FUNCTION (node) | |
| 2408 { | |
| 2409 node->aux = 0; | |
| 0 | 2410 |
| 111 | 2411 /* Recompute the default reasons for inlining because they may have |
| 2412 changed during merging. */ | |
| 2413 if (in_lto_p) | |
| 2414 { | |
| 2415 for (cgraph_edge *e = node->callees; e; e = e->next_callee) | |
| 2416 { | |
| 2417 gcc_assert (e->inline_failed); | |
| 2418 initialize_inline_failed (e); | |
| 2419 } | |
| 2420 for (cgraph_edge *e = node->indirect_calls; e; e = e->next_callee) | |
| 2421 initialize_inline_failed (e); | |
| 2422 } | |
| 2423 } | |
| 0 | 2424 |
| 2425 if (dump_file) | |
|
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|
2426 fprintf (dump_file, "\nFlattening functions:\n"); |
| 0 | 2427 |
|
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|
2428 /* In the first pass handle functions to be flattened. Do this with |
|
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|
2429 a priority so none of our later choices will make this impossible. */ |
|
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|
2430 for (i = nnodes - 1; i >= 0; i--) |
| 0 | 2431 { |
|
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|
2432 node = order[i]; |
| 0 | 2433 |
| 111 | 2434 /* Handle nodes to be flattened. |
|
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|
2435 Ideally when processing callees we stop inlining at the |
|
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|
2436 entry of cycles, possibly cloning that entry point and |
|
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|
2437 try to flatten itself turning it into a self-recursive |
|
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|
2438 function. */ |
|
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|
2439 if (lookup_attribute ("flatten", |
|
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|
2440 DECL_ATTRIBUTES (node->decl)) != NULL) |
|
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|
2441 { |
| 0 | 2442 if (dump_file) |
| 2443 fprintf (dump_file, | |
| 111 | 2444 "Flattening %s\n", node->name ()); |
| 2445 flatten_function (node, false); | |
| 0 | 2446 } |
| 2447 } | |
| 111 | 2448 if (dump_file) |
| 2449 dump_overall_stats (); | |
| 0 | 2450 |
| 111 | 2451 inline_small_functions (); |
| 0 | 2452 |
| 111 | 2453 gcc_assert (symtab->state == IPA_SSA); |
| 2454 symtab->state = IPA_SSA_AFTER_INLINING; | |
| 2455 /* Do first after-inlining removal. We want to remove all "stale" extern | |
| 2456 inline functions and virtual functions so we really know what is called | |
| 2457 once. */ | |
| 2458 symtab->remove_unreachable_nodes (dump_file); | |
| 2459 free (order); | |
| 0 | 2460 |
| 111 | 2461 /* Inline functions with a property that after inlining into all callers the |
| 2462 code size will shrink because the out-of-line copy is eliminated. | |
| 2463 We do this regardless on the callee size as long as function growth limits | |
| 2464 are met. */ | |
| 2465 if (dump_file) | |
| 2466 fprintf (dump_file, | |
| 2467 "\nDeciding on functions to be inlined into all callers and " | |
| 2468 "removing useless speculations:\n"); | |
| 0 | 2469 |
| 111 | 2470 /* Inlining one function called once has good chance of preventing |
| 2471 inlining other function into the same callee. Ideally we should | |
| 2472 work in priority order, but probably inlining hot functions first | |
| 2473 is good cut without the extra pain of maintaining the queue. | |
| 2474 | |
| 2475 ??? this is not really fitting the bill perfectly: inlining function | |
| 2476 into callee often leads to better optimization of callee due to | |
| 2477 increased context for optimization. | |
| 2478 For example if main() function calls a function that outputs help | |
| 2479 and then function that does the main optmization, we should inline | |
| 2480 the second with priority even if both calls are cold by themselves. | |
| 2481 | |
| 2482 We probably want to implement new predicate replacing our use of | |
| 2483 maybe_hot_edge interpreted as maybe_hot_edge || callee is known | |
| 2484 to be hot. */ | |
| 2485 for (cold = 0; cold <= 1; cold ++) | |
| 2486 { | |
| 2487 FOR_EACH_DEFINED_FUNCTION (node) | |
| 2488 { | |
| 2489 struct cgraph_edge *edge, *next; | |
| 2490 bool update=false; | |
| 2491 | |
| 2492 if (!opt_for_fn (node->decl, optimize) | |
| 2493 || !opt_for_fn (node->decl, flag_inline_functions_called_once)) | |
| 2494 continue; | |
| 2495 | |
| 2496 for (edge = node->callees; edge; edge = next) | |
| 0 | 2497 { |
| 111 | 2498 next = edge->next_callee; |
| 2499 if (edge->speculative && !speculation_useful_p (edge, false)) | |
| 0 | 2500 { |
| 111 | 2501 edge->resolve_speculation (); |
| 2502 spec_rem += edge->count; | |
| 2503 update = true; | |
| 2504 remove_functions = true; | |
| 0 | 2505 } |
| 111 | 2506 } |
| 2507 if (update) | |
| 2508 { | |
| 2509 struct cgraph_node *where = node->global.inlined_to | |
| 2510 ? node->global.inlined_to : node; | |
| 2511 reset_edge_caches (where); | |
| 2512 ipa_update_overall_fn_summary (where); | |
| 2513 } | |
| 2514 if (want_inline_function_to_all_callers_p (node, cold)) | |
| 2515 { | |
| 2516 int num_calls = 0; | |
| 2517 node->call_for_symbol_and_aliases (sum_callers, &num_calls, | |
| 2518 true); | |
| 2519 while (node->call_for_symbol_and_aliases | |
| 2520 (inline_to_all_callers, &num_calls, true)) | |
| 2521 ; | |
| 2522 remove_functions = true; | |
| 0 | 2523 } |
| 2524 } | |
| 2525 } | |
| 2526 | |
| 2527 /* Free ipa-prop structures if they are no longer needed. */ | |
| 111 | 2528 ipa_free_all_structures_after_iinln (); |
| 2529 | |
| 2530 if (dump_file) | |
| 2531 { | |
| 2532 fprintf (dump_file, | |
| 2533 "\nInlined %i calls, eliminated %i functions\n\n", | |
| 2534 ncalls_inlined, nfunctions_inlined); | |
| 2535 dump_inline_stats (); | |
| 2536 } | |
| 0 | 2537 |
| 2538 if (dump_file) | |
| 111 | 2539 ipa_dump_fn_summaries (dump_file); |
| 2540 /* In WPA we use inline summaries for partitioning process. */ | |
| 2541 if (!flag_wpa) | |
| 2542 ipa_free_fn_summary (); | |
| 2543 return remove_functions ? TODO_remove_functions : 0; | |
| 0 | 2544 } |
| 2545 | |
| 111 | 2546 /* Inline always-inline function calls in NODE. */ |
|
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|
2547 |
|
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|
2548 static bool |
| 111 | 2549 inline_always_inline_functions (struct cgraph_node *node) |
|
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|
2550 { |
|
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|
2551 struct cgraph_edge *e; |
| 111 | 2552 bool inlined = false; |
| 2553 | |
| 2554 for (e = node->callees; e; e = e->next_callee) | |
| 2555 { | |
| 2556 struct cgraph_node *callee = e->callee->ultimate_alias_target (); | |
| 2557 if (!DECL_DISREGARD_INLINE_LIMITS (callee->decl)) | |
| 2558 continue; | |
| 2559 | |
| 2560 if (e->recursive_p ()) | |
| 2561 { | |
| 2562 if (dump_file) | |
| 2563 fprintf (dump_file, " Not inlining recursive call to %s.\n", | |
| 2564 e->callee->name ()); | |
| 2565 e->inline_failed = CIF_RECURSIVE_INLINING; | |
| 2566 continue; | |
| 2567 } | |
| 2568 | |
| 2569 if (!can_early_inline_edge_p (e)) | |
| 2570 { | |
| 2571 /* Set inlined to true if the callee is marked "always_inline" but | |
| 2572 is not inlinable. This will allow flagging an error later in | |
| 2573 expand_call_inline in tree-inline.c. */ | |
| 2574 if (lookup_attribute ("always_inline", | |
| 2575 DECL_ATTRIBUTES (callee->decl)) != NULL) | |
| 2576 inlined = true; | |
| 2577 continue; | |
| 2578 } | |
| 2579 | |
| 2580 if (dump_file) | |
| 2581 fprintf (dump_file, " Inlining %s into %s (always_inline).\n", | |
| 2582 xstrdup_for_dump (e->callee->name ()), | |
| 2583 xstrdup_for_dump (e->caller->name ())); | |
| 2584 inline_call (e, true, NULL, NULL, false); | |
| 2585 inlined = true; | |
| 2586 } | |
| 2587 if (inlined) | |
| 2588 ipa_update_overall_fn_summary (node); | |
| 2589 | |
| 2590 return inlined; | |
| 0 | 2591 } |
| 2592 | |
| 2593 /* Decide on the inlining. We do so in the topological order to avoid | |
|
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|
2594 expenses on updating data structures. */ |
| 0 | 2595 |
| 2596 static bool | |
| 111 | 2597 early_inline_small_functions (struct cgraph_node *node) |
| 0 | 2598 { |
| 2599 struct cgraph_edge *e; | |
| 2600 bool inlined = false; | |
| 111 | 2601 |
| 2602 for (e = node->callees; e; e = e->next_callee) | |
| 2603 { | |
| 2604 struct cgraph_node *callee = e->callee->ultimate_alias_target (); | |
| 2605 if (!ipa_fn_summaries->get (callee)->inlinable | |
| 2606 || !e->inline_failed) | |
| 2607 continue; | |
| 0 | 2608 |
| 111 | 2609 /* Do not consider functions not declared inline. */ |
| 2610 if (!DECL_DECLARED_INLINE_P (callee->decl) | |
| 2611 && !opt_for_fn (node->decl, flag_inline_small_functions) | |
| 2612 && !opt_for_fn (node->decl, flag_inline_functions)) | |
| 2613 continue; | |
| 2614 | |
| 2615 if (dump_file) | |
| 2616 fprintf (dump_file, "Considering inline candidate %s.\n", | |
| 2617 callee->name ()); | |
| 0 | 2618 |
| 111 | 2619 if (!can_early_inline_edge_p (e)) |
| 2620 continue; | |
| 2621 | |
| 2622 if (e->recursive_p ()) | |
| 2623 { | |
| 2624 if (dump_file) | |
| 2625 fprintf (dump_file, " Not inlining: recursive call.\n"); | |
| 2626 continue; | |
| 2627 } | |
| 2628 | |
| 2629 if (!want_early_inline_function_p (e)) | |
| 2630 continue; | |
| 2631 | |
| 0 | 2632 if (dump_file) |
| 111 | 2633 fprintf (dump_file, " Inlining %s into %s.\n", |
| 2634 xstrdup_for_dump (callee->name ()), | |
| 2635 xstrdup_for_dump (e->caller->name ())); | |
| 2636 inline_call (e, true, NULL, NULL, false); | |
| 2637 inlined = true; | |
| 0 | 2638 } |
| 2639 | |
| 111 | 2640 if (inlined) |
| 2641 ipa_update_overall_fn_summary (node); | |
| 0 | 2642 |
| 2643 return inlined; | |
| 2644 } | |
| 2645 | |
| 111 | 2646 unsigned int |
| 2647 early_inliner (function *fun) | |
| 0 | 2648 { |
| 111 | 2649 struct cgraph_node *node = cgraph_node::get (current_function_decl); |
| 2650 struct cgraph_edge *edge; | |
| 0 | 2651 unsigned int todo = 0; |
|
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|
2652 int iterations = 0; |
| 111 | 2653 bool inlined = false; |
| 0 | 2654 |
|
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|
2655 if (seen_error ()) |
| 0 | 2656 return 0; |
|
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|
2657 |
| 111 | 2658 /* Do nothing if datastructures for ipa-inliner are already computed. This |
| 2659 happens when some pass decides to construct new function and | |
| 2660 cgraph_add_new_function calls lowering passes and early optimization on | |
| 2661 it. This may confuse ourself when early inliner decide to inline call to | |
| 2662 function clone, because function clones don't have parameter list in | |
| 2663 ipa-prop matching their signature. */ | |
| 2664 if (ipa_node_params_sum) | |
| 2665 return 0; | |
| 2666 | |
| 2667 if (flag_checking) | |
| 2668 node->verify (); | |
| 2669 node->remove_all_references (); | |
| 2670 | |
| 2671 /* Rebuild this reference because it dosn't depend on | |
| 2672 function's body and it's required to pass cgraph_node | |
| 2673 verification. */ | |
| 2674 if (node->instrumented_version | |
| 2675 && !node->instrumentation_clone) | |
| 2676 node->create_reference (node->instrumented_version, IPA_REF_CHKP, NULL); | |
| 2677 | |
| 2678 /* Even when not optimizing or not inlining inline always-inline | |
| 2679 functions. */ | |
| 2680 inlined = inline_always_inline_functions (node); | |
| 2681 | |
|
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|
2682 if (!optimize |
|
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|
2683 || flag_no_inline |
| 111 | 2684 || !flag_early_inlining |
| 2685 /* Never inline regular functions into always-inline functions | |
| 2686 during incremental inlining. This sucks as functions calling | |
| 2687 always inline functions will get less optimized, but at the | |
| 2688 same time inlining of functions calling always inline | |
| 2689 function into an always inline function might introduce | |
| 2690 cycles of edges to be always inlined in the callgraph. | |
| 2691 | |
| 2692 We might want to be smarter and just avoid this type of inlining. */ | |
| 2693 || (DECL_DISREGARD_INLINE_LIMITS (node->decl) | |
| 2694 && lookup_attribute ("always_inline", | |
| 2695 DECL_ATTRIBUTES (node->decl)))) | |
| 2696 ; | |
| 2697 else if (lookup_attribute ("flatten", | |
| 2698 DECL_ATTRIBUTES (node->decl)) != NULL) | |
| 0 | 2699 { |
| 111 | 2700 /* When the function is marked to be flattened, recursively inline |
| 2701 all calls in it. */ | |
| 2702 if (dump_file) | |
| 2703 fprintf (dump_file, | |
| 2704 "Flattening %s\n", node->name ()); | |
| 2705 flatten_function (node, true); | |
| 2706 inlined = true; | |
| 0 | 2707 } |
|
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|
2708 else |
|
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|
2709 { |
| 111 | 2710 /* If some always_inline functions was inlined, apply the changes. |
| 2711 This way we will not account always inline into growth limits and | |
| 2712 moreover we will inline calls from always inlines that we skipped | |
| 2713 previously because of conditional above. */ | |
| 2714 if (inlined) | |
|
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|
2715 { |
|
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2716 timevar_push (TV_INTEGRATION); |
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2717 todo |= optimize_inline_calls (current_function_decl); |
| 111 | 2718 /* optimize_inline_calls call above might have introduced new |
| 2719 statements that don't have inline parameters computed. */ | |
| 2720 for (edge = node->callees; edge; edge = edge->next_callee) | |
| 2721 { | |
| 2722 struct ipa_call_summary *es = ipa_call_summaries->get (edge); | |
| 2723 es->call_stmt_size | |
| 2724 = estimate_num_insns (edge->call_stmt, &eni_size_weights); | |
| 2725 es->call_stmt_time | |
| 2726 = estimate_num_insns (edge->call_stmt, &eni_time_weights); | |
| 2727 } | |
| 2728 ipa_update_overall_fn_summary (node); | |
| 2729 inlined = false; | |
|
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2730 timevar_pop (TV_INTEGRATION); |
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2731 } |
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2732 /* We iterate incremental inlining to get trivial cases of indirect |
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2733 inlining. */ |
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2734 while (iterations < PARAM_VALUE (PARAM_EARLY_INLINER_MAX_ITERATIONS) |
| 111 | 2735 && early_inline_small_functions (node)) |
|
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2736 { |
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2737 timevar_push (TV_INTEGRATION); |
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2738 todo |= optimize_inline_calls (current_function_decl); |
| 111 | 2739 |
| 2740 /* Technically we ought to recompute inline parameters so the new | |
| 2741 iteration of early inliner works as expected. We however have | |
| 2742 values approximately right and thus we only need to update edge | |
| 2743 info that might be cleared out for newly discovered edges. */ | |
| 2744 for (edge = node->callees; edge; edge = edge->next_callee) | |
| 2745 { | |
| 2746 /* We have no summary for new bound store calls yet. */ | |
| 2747 struct ipa_call_summary *es = ipa_call_summaries->get (edge); | |
| 2748 es->call_stmt_size | |
| 2749 = estimate_num_insns (edge->call_stmt, &eni_size_weights); | |
| 2750 es->call_stmt_time | |
| 2751 = estimate_num_insns (edge->call_stmt, &eni_time_weights); | |
| 2752 | |
| 2753 if (edge->callee->decl | |
| 2754 && !gimple_check_call_matching_types ( | |
| 2755 edge->call_stmt, edge->callee->decl, false)) | |
| 2756 { | |
| 2757 edge->inline_failed = CIF_MISMATCHED_ARGUMENTS; | |
| 2758 edge->call_stmt_cannot_inline_p = true; | |
| 2759 } | |
| 2760 } | |
| 2761 if (iterations < PARAM_VALUE (PARAM_EARLY_INLINER_MAX_ITERATIONS) - 1) | |
| 2762 ipa_update_overall_fn_summary (node); | |
| 2763 timevar_pop (TV_INTEGRATION); | |
|
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2764 iterations++; |
| 111 | 2765 inlined = false; |
|
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2766 } |
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2767 if (dump_file) |
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2768 fprintf (dump_file, "Iterations: %i\n", iterations); |
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2769 } |
| 0 | 2770 |
| 111 | 2771 if (inlined) |
| 2772 { | |
| 2773 timevar_push (TV_INTEGRATION); | |
| 2774 todo |= optimize_inline_calls (current_function_decl); | |
| 2775 timevar_pop (TV_INTEGRATION); | |
| 2776 } | |
| 2777 | |
| 2778 fun->always_inline_functions_inlined = true; | |
|
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2779 |
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2780 return todo; |
| 0 | 2781 } |
| 2782 | |
| 111 | 2783 /* Do inlining of small functions. Doing so early helps profiling and other |
| 2784 passes to be somewhat more effective and avoids some code duplication in | |
| 2785 later real inlining pass for testcases with very many function calls. */ | |
| 2786 | |
| 2787 namespace { | |
| 2788 | |
| 2789 const pass_data pass_data_early_inline = | |
| 0 | 2790 { |
| 111 | 2791 GIMPLE_PASS, /* type */ |
| 2792 "einline", /* name */ | |
| 2793 OPTGROUP_INLINE, /* optinfo_flags */ | |
| 2794 TV_EARLY_INLINING, /* tv_id */ | |
| 2795 PROP_ssa, /* properties_required */ | |
| 2796 0, /* properties_provided */ | |
| 2797 0, /* properties_destroyed */ | |
| 2798 0, /* todo_flags_start */ | |
| 2799 0, /* todo_flags_finish */ | |
| 0 | 2800 }; |
| 2801 | |
| 111 | 2802 class pass_early_inline : public gimple_opt_pass |
|
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2803 { |
| 111 | 2804 public: |
| 2805 pass_early_inline (gcc::context *ctxt) | |
| 2806 : gimple_opt_pass (pass_data_early_inline, ctxt) | |
| 2807 {} | |
|
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2808 |
| 111 | 2809 /* opt_pass methods: */ |
| 2810 virtual unsigned int execute (function *); | |
| 2811 | |
| 2812 }; // class pass_early_inline | |
| 2813 | |
| 2814 unsigned int | |
| 2815 pass_early_inline::execute (function *fun) | |
| 2816 { | |
| 2817 return early_inliner (fun); | |
|
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2818 } |
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2819 |
| 111 | 2820 } // anon namespace |
|
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2821 |
| 111 | 2822 gimple_opt_pass * |
| 2823 make_pass_early_inline (gcc::context *ctxt) | |
| 0 | 2824 { |
| 111 | 2825 return new pass_early_inline (ctxt); |
| 0 | 2826 } |
| 2827 | |
| 111 | 2828 namespace { |
|
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2829 |
| 111 | 2830 const pass_data pass_data_ipa_inline = |
|
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2831 { |
| 111 | 2832 IPA_PASS, /* type */ |
| 2833 "inline", /* name */ | |
| 2834 OPTGROUP_INLINE, /* optinfo_flags */ | |
| 2835 TV_IPA_INLINING, /* tv_id */ | |
| 2836 0, /* properties_required */ | |
| 2837 0, /* properties_provided */ | |
| 2838 0, /* properties_destroyed */ | |
| 2839 0, /* todo_flags_start */ | |
| 2840 ( TODO_dump_symtab ), /* todo_flags_finish */ | |
| 0 | 2841 }; |
| 2842 | |
| 111 | 2843 class pass_ipa_inline : public ipa_opt_pass_d |
| 2844 { | |
| 2845 public: | |
| 2846 pass_ipa_inline (gcc::context *ctxt) | |
| 2847 : ipa_opt_pass_d (pass_data_ipa_inline, ctxt, | |
| 2848 NULL, /* generate_summary */ | |
| 2849 NULL, /* write_summary */ | |
| 2850 NULL, /* read_summary */ | |
| 2851 NULL, /* write_optimization_summary */ | |
| 2852 NULL, /* read_optimization_summary */ | |
| 2853 NULL, /* stmt_fixup */ | |
| 2854 0, /* function_transform_todo_flags_start */ | |
| 2855 inline_transform, /* function_transform */ | |
| 2856 NULL) /* variable_transform */ | |
| 2857 {} | |
| 0 | 2858 |
| 111 | 2859 /* opt_pass methods: */ |
| 2860 virtual unsigned int execute (function *) { return ipa_inline (); } | |
| 2861 | |
| 2862 }; // class pass_ipa_inline | |
| 2863 | |
| 2864 } // anon namespace | |
| 2865 | |
| 2866 ipa_opt_pass_d * | |
| 2867 make_pass_ipa_inline (gcc::context *ctxt) | |
| 2868 { | |
| 2869 return new pass_ipa_inline (ctxt); | |
| 2870 } |