gcc/passes.def

   1 /* Description of pass structure
   2    Copyright (C) 1987-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /*
  21  Macros that should be defined when using this file:
  22    INSERT_PASSES_AFTER (PASS)
  23    PUSH_INSERT_PASSES_WITHIN (PASS)
  24    POP_INSERT_PASSES ()
  25    NEXT_PASS (PASS)
  26    TERMINATE_PASS_LIST ()
  27  */
  28
  29  /* All passes needed to lower the function into shape optimizers can
  30     operate on.  These passes are always run first on the function, but
  31     backend might produce already lowered functions that are not processed
  32     by these passes.  */
  33   INSERT_PASSES_AFTER (all_lowering_passes)
  34   NEXT_PASS (pass_warn_unused_result);
  35   NEXT_PASS (pass_diagnose_omp_blocks);
  36   NEXT_PASS (pass_diagnose_tm_blocks);
  37   NEXT_PASS (pass_lower_omp);
  38   NEXT_PASS (pass_lower_cf);
  39   NEXT_PASS (pass_lower_tm);
  40   NEXT_PASS (pass_refactor_eh);
  41   NEXT_PASS (pass_lower_eh);
  42   NEXT_PASS (pass_build_cfg);
  43   NEXT_PASS (pass_warn_function_return);
  44   NEXT_PASS (pass_expand_omp);
  45   NEXT_PASS (pass_build_cgraph_edges);
  46   TERMINATE_PASS_LIST ()
  47
  48   /* Interprocedural optimization passes.  */
  49   INSERT_PASSES_AFTER (all_small_ipa_passes)
  50   NEXT_PASS (pass_ipa_free_lang_data);
  51   NEXT_PASS (pass_ipa_function_and_variable_visibility);
  52   NEXT_PASS (pass_early_local_passes);
  53   PUSH_INSERT_PASSES_WITHIN (pass_early_local_passes)
  54       NEXT_PASS (pass_fixup_cfg);
  55       NEXT_PASS (pass_init_datastructures);
  56
  57       NEXT_PASS (pass_build_ssa);
  58       NEXT_PASS (pass_ubsan);
  59       NEXT_PASS (pass_early_warn_uninitialized);
  60       NEXT_PASS (pass_rebuild_cgraph_edges);
  61       NEXT_PASS (pass_inline_parameters);
  62       NEXT_PASS (pass_early_inline);
  63       NEXT_PASS (pass_all_early_optimizations);
  64       PUSH_INSERT_PASSES_WITHIN (pass_all_early_optimizations)
  65           NEXT_PASS (pass_remove_cgraph_callee_edges);
  66           NEXT_PASS (pass_rename_ssa_copies);
  67           NEXT_PASS (pass_ccp);
  68           /* After CCP we rewrite no longer addressed locals into SSA
  69              form if possible.  */
  70           NEXT_PASS (pass_forwprop);
  71           NEXT_PASS (pass_sra_early);
  72           /* pass_build_ealias is a dummy pass that ensures that we
  73              execute TODO_rebuild_alias at this point.  */
  74           NEXT_PASS (pass_build_ealias);
  75           NEXT_PASS (pass_fre);
  76           NEXT_PASS (pass_merge_phi);
  77           NEXT_PASS (pass_cd_dce);
  78           NEXT_PASS (pass_early_ipa_sra);
  79           NEXT_PASS (pass_tail_recursion);
  80           NEXT_PASS (pass_convert_switch);
  81           NEXT_PASS (pass_cleanup_eh);
  82           NEXT_PASS (pass_profile);
  83           NEXT_PASS (pass_local_pure_const);
  84           /* Split functions creates parts that are not run through
  85              early optimizations again.  It is thus good idea to do this
  86              late.  */
  87           NEXT_PASS (pass_split_functions);
  88       POP_INSERT_PASSES ()
  89       NEXT_PASS (pass_release_ssa_names);
  90       NEXT_PASS (pass_rebuild_cgraph_edges);
  91       NEXT_PASS (pass_inline_parameters);
  92   POP_INSERT_PASSES ()
  93   NEXT_PASS (pass_ipa_free_inline_summary);
  94   NEXT_PASS (pass_ipa_tree_profile);
  95   PUSH_INSERT_PASSES_WITHIN (pass_ipa_tree_profile)
  96       NEXT_PASS (pass_feedback_split_functions);
  97   POP_INSERT_PASSES ()
  98   NEXT_PASS (pass_ipa_increase_alignment);
  99   NEXT_PASS (pass_ipa_tm);
 100   NEXT_PASS (pass_ipa_lower_emutls);
 101   TERMINATE_PASS_LIST ()
 102
 103   INSERT_PASSES_AFTER (all_regular_ipa_passes)
 104   NEXT_PASS (pass_ipa_whole_program_visibility);
 105   NEXT_PASS (pass_ipa_profile);
 106   NEXT_PASS (pass_ipa_devirt);
 107   NEXT_PASS (pass_ipa_cp);
 108   NEXT_PASS (pass_ipa_cdtor_merge);
 109   NEXT_PASS (pass_ipa_inline);
 110   NEXT_PASS (pass_ipa_pure_const);
 111   NEXT_PASS (pass_ipa_reference);
 112   /* This pass needs to be scheduled after any IP code duplication.   */
 113   NEXT_PASS (pass_ipa_single_use);
 114   /* Comdat privatization come last, as direct references to comdat local
 115      symbols are not allowed outside of the comdat group.  Privatizing early
 116      would result in missed optimizations due to this restriction.  */
 117   NEXT_PASS (pass_ipa_comdats);
 118   TERMINATE_PASS_LIST ()
 119
 120   /* Simple IPA passes executed after the regular passes.  In WHOPR mode the
 121      passes are executed after partitioning and thus see just parts of the
 122      compiled unit.  */
 123   INSERT_PASSES_AFTER (all_late_ipa_passes)
 124   NEXT_PASS (pass_ipa_pta);
 125   NEXT_PASS (pass_omp_simd_clone);
 126   TERMINATE_PASS_LIST ()
 127
 128   /* These passes are run after IPA passes on every function that is being
 129      output to the assembler file.  */
 130   INSERT_PASSES_AFTER (all_passes)
 131   NEXT_PASS (pass_fixup_cfg);
 132   NEXT_PASS (pass_lower_eh_dispatch);
 133   NEXT_PASS (pass_all_optimizations);
 134   PUSH_INSERT_PASSES_WITHIN (pass_all_optimizations)
 135       NEXT_PASS (pass_remove_cgraph_callee_edges);
 136       /* Initial scalar cleanups before alias computation.
 137          They ensure memory accesses are not indirect wherever possible.  */
 138       NEXT_PASS (pass_strip_predict_hints);
 139       NEXT_PASS (pass_rename_ssa_copies);
 140       NEXT_PASS (pass_ccp);
 141       /* After CCP we rewrite no longer addressed locals into SSA
 142          form if possible.  */
 143       NEXT_PASS (pass_copy_prop);
 144       NEXT_PASS (pass_complete_unrolli);
 145       NEXT_PASS (pass_phiprop);
 146       NEXT_PASS (pass_forwprop);
 147       NEXT_PASS (pass_object_sizes);
 148       /* pass_build_alias is a dummy pass that ensures that we
 149          execute TODO_rebuild_alias at this point.  */
 150       NEXT_PASS (pass_build_alias);
 151       NEXT_PASS (pass_return_slot);
 152       NEXT_PASS (pass_fre);
 153       NEXT_PASS (pass_merge_phi);
 154       NEXT_PASS (pass_vrp);
 155       NEXT_PASS (pass_dce);
 156       NEXT_PASS (pass_call_cdce);
 157       NEXT_PASS (pass_cselim);
 158       NEXT_PASS (pass_copy_prop);
 159       NEXT_PASS (pass_tree_ifcombine);
 160       NEXT_PASS (pass_phiopt);
 161       NEXT_PASS (pass_tail_recursion);
 162       NEXT_PASS (pass_ch);
 163       NEXT_PASS (pass_stdarg);
 164       NEXT_PASS (pass_lower_complex);
 165       NEXT_PASS (pass_sra);
 166       NEXT_PASS (pass_rename_ssa_copies);
 167       /* The dom pass will also resolve all __builtin_constant_p calls
 168          that are still there to 0.  This has to be done after some
 169          propagations have already run, but before some more dead code
 170          is removed, and this place fits nicely.  Remember this when
 171          trying to move or duplicate pass_dominator somewhere earlier.  */
 172       NEXT_PASS (pass_dominator);
 173       /* At this point the majority of const/copy propagations
 174          are exposed.  Go ahead and identify paths that should never
 175          be executed in a conforming program and isolate those paths.
 176
 177          This will expose more degenerate PHIs in the main path and
 178          expose more PRE/DOM optimization opportunities.  */
 179       NEXT_PASS (pass_isolate_erroneous_paths);
 180       /* The only const/copy propagation opportunities left after
 181          DOM and erroneous path isolation should be due to degenerate PHI nodes.
 182          So rather than run the full propagators, run a specialized pass which
 183          only examines PHIs to discover const/copy propagation
 184          opportunities.  */
 185       NEXT_PASS (pass_phi_only_cprop);
 186       NEXT_PASS (pass_dse);
 187       NEXT_PASS (pass_reassoc);
 188       NEXT_PASS (pass_dce);
 189       NEXT_PASS (pass_forwprop);
 190       NEXT_PASS (pass_phiopt);
 191       NEXT_PASS (pass_ccp);
 192       /* After CCP we rewrite no longer addressed locals into SSA
 193          form if possible.  */
 194       NEXT_PASS (pass_copy_prop);
 195       NEXT_PASS (pass_cse_sincos);
 196       NEXT_PASS (pass_optimize_bswap);
 197       NEXT_PASS (pass_split_crit_edges);
 198       NEXT_PASS (pass_pre);
 199       NEXT_PASS (pass_sink_code);
 200       NEXT_PASS (pass_asan);
 201       NEXT_PASS (pass_tsan);
 202       /* Pass group that runs when 1) enabled, 2) there are loops
 203          in the function.  */
 204       NEXT_PASS (pass_tree_loop);
 205       PUSH_INSERT_PASSES_WITHIN (pass_tree_loop)
 206           NEXT_PASS (pass_tree_loop_init);
 207           NEXT_PASS (pass_lim);
 208           NEXT_PASS (pass_copy_prop);
 209           NEXT_PASS (pass_dce);
 210           NEXT_PASS (pass_tree_unswitch);
 211           NEXT_PASS (pass_scev_cprop);
 212           NEXT_PASS (pass_record_bounds);
 213           NEXT_PASS (pass_check_data_deps);
 214           NEXT_PASS (pass_loop_distribution);
 215           NEXT_PASS (pass_copy_prop);
 216           NEXT_PASS (pass_graphite);
 217           PUSH_INSERT_PASSES_WITHIN (pass_graphite)
 218               NEXT_PASS (pass_graphite_transforms);
 219               NEXT_PASS (pass_lim);
 220               NEXT_PASS (pass_copy_prop);
 221               NEXT_PASS (pass_dce);
 222           POP_INSERT_PASSES ()
 223           NEXT_PASS (pass_iv_canon);
 224           NEXT_PASS (pass_parallelize_loops);
 225           NEXT_PASS (pass_if_conversion);
 226           /* pass_vectorize must immediately follow pass_if_conversion.
 227              Please do not add any other passes in between.  */
 228           NEXT_PASS (pass_vectorize);
 229           PUSH_INSERT_PASSES_WITHIN (pass_vectorize)
 230               NEXT_PASS (pass_dce);
 231           POP_INSERT_PASSES ()
 232           NEXT_PASS (pass_predcom);
 233           NEXT_PASS (pass_complete_unroll);
 234           NEXT_PASS (pass_slp_vectorize);
 235           NEXT_PASS (pass_loop_prefetch);
 236           /* Run IVOPTs after the last pass that uses data-reference analysis
 237              as that doesn't handle TARGET_MEM_REFs.  */
 238           NEXT_PASS (pass_iv_optimize);
 239           NEXT_PASS (pass_lim);
 240           NEXT_PASS (pass_tree_loop_done);
 241       POP_INSERT_PASSES ()
 242       /* Pass group that runs when pass_tree_loop is disabled or there
 243          are no loops in the function.  */
 244       NEXT_PASS (pass_tree_no_loop);
 245       PUSH_INSERT_PASSES_WITHIN (pass_tree_no_loop)
 246           NEXT_PASS (pass_slp_vectorize);
 247       POP_INSERT_PASSES ()
 248       NEXT_PASS (pass_lower_vector_ssa);
 249       NEXT_PASS (pass_cse_reciprocals);
 250       NEXT_PASS (pass_reassoc);
 251       NEXT_PASS (pass_strength_reduction);
 252       NEXT_PASS (pass_dominator);
 253       NEXT_PASS (pass_strlen);
 254       NEXT_PASS (pass_vrp);
 255       /* The only const/copy propagation opportunities left after
 256          DOM and VRP should be due to degenerate PHI nodes.  So rather than
 257          run the full propagators, run a specialized pass which
 258          only examines PHIs to discover const/copy propagation
 259          opportunities.  */
 260       NEXT_PASS (pass_phi_only_cprop);
 261       NEXT_PASS (pass_cd_dce);
 262       NEXT_PASS (pass_tracer);
 263       NEXT_PASS (pass_dse);
 264       NEXT_PASS (pass_forwprop);
 265       NEXT_PASS (pass_phiopt);
 266       NEXT_PASS (pass_fold_builtins);
 267       NEXT_PASS (pass_optimize_widening_mul);
 268       NEXT_PASS (pass_tail_calls);
 269       NEXT_PASS (pass_rename_ssa_copies);
 270       /* FIXME: If DCE is not run before checking for uninitialized uses,
 271          we may get false warnings (e.g., testsuite/gcc.dg/uninit-5.c).
 272          However, this also causes us to misdiagnose cases that should be
 273          real warnings (e.g., testsuite/gcc.dg/pr18501.c).
 274
 275          To fix the false positives in uninit-5.c, we would have to
 276          account for the predicates protecting the set and the use of each
 277          variable.  Using a representation like Gated Single Assignment
 278          may help.  */
 279       /* Split critical edges before late uninit warning to reduce the
 280          number of false positives from it.  */
 281       NEXT_PASS (pass_split_crit_edges);
 282       NEXT_PASS (pass_late_warn_uninitialized);
 283       NEXT_PASS (pass_uncprop);
 284       NEXT_PASS (pass_local_pure_const);
 285   POP_INSERT_PASSES ()
 286   NEXT_PASS (pass_all_optimizations_g);
 287   PUSH_INSERT_PASSES_WITHIN (pass_all_optimizations_g)
 288       NEXT_PASS (pass_remove_cgraph_callee_edges);
 289       NEXT_PASS (pass_strip_predict_hints);
 290       /* Lower remaining pieces of GIMPLE.  */
 291       NEXT_PASS (pass_lower_complex);
 292       NEXT_PASS (pass_lower_vector_ssa);
 293       /* Perform simple scalar cleanup which is constant/copy propagation.  */
 294       NEXT_PASS (pass_ccp);
 295       NEXT_PASS (pass_object_sizes);
 296       /* Fold remaining builtins.  */
 297       NEXT_PASS (pass_fold_builtins);
 298       /* Copy propagation also copy-propagates constants, this is necessary
 299          to forward object-size and builtin folding results properly.  */
 300       NEXT_PASS (pass_copy_prop);
 301       NEXT_PASS (pass_dce);
 302       NEXT_PASS (pass_asan);
 303       NEXT_PASS (pass_tsan);
 304       NEXT_PASS (pass_rename_ssa_copies);
 305       /* ???  We do want some kind of loop invariant motion, but we possibly
 306          need to adjust LIM to be more friendly towards preserving accurate
 307          debug information here.  */
 308       /* Split critical edges before late uninit warning to reduce the
 309          number of false positives from it.  */
 310       NEXT_PASS (pass_split_crit_edges);
 311       NEXT_PASS (pass_late_warn_uninitialized);
 312       NEXT_PASS (pass_uncprop);
 313       NEXT_PASS (pass_local_pure_const);
 314   POP_INSERT_PASSES ()
 315   NEXT_PASS (pass_tm_init);
 316   PUSH_INSERT_PASSES_WITHIN (pass_tm_init)
 317       NEXT_PASS (pass_tm_mark);
 318       NEXT_PASS (pass_tm_memopt);
 319       NEXT_PASS (pass_tm_edges);
 320   POP_INSERT_PASSES ()
 321   NEXT_PASS (pass_vtable_verify);
 322   NEXT_PASS (pass_lower_vector);
 323   NEXT_PASS (pass_lower_complex_O0);
 324   NEXT_PASS (pass_asan_O0);
 325   NEXT_PASS (pass_tsan_O0);
 326   NEXT_PASS (pass_sanopt);
 327   NEXT_PASS (pass_cleanup_eh);
 328   NEXT_PASS (pass_lower_resx);
 329   NEXT_PASS (pass_nrv);
 330   NEXT_PASS (pass_cleanup_cfg_post_optimizing);
 331   NEXT_PASS (pass_warn_function_noreturn);
 332
 333   NEXT_PASS (pass_expand);
 334
 335   NEXT_PASS (pass_rest_of_compilation);
 336   PUSH_INSERT_PASSES_WITHIN (pass_rest_of_compilation)
 337       NEXT_PASS (pass_instantiate_virtual_regs);
 338       NEXT_PASS (pass_into_cfg_layout_mode);
 339       NEXT_PASS (pass_jump);
 340       NEXT_PASS (pass_lower_subreg);
 341       NEXT_PASS (pass_df_initialize_opt);
 342       NEXT_PASS (pass_cse);
 343       NEXT_PASS (pass_rtl_fwprop);
 344       NEXT_PASS (pass_rtl_cprop);
 345       NEXT_PASS (pass_rtl_pre);
 346       NEXT_PASS (pass_rtl_hoist);
 347       NEXT_PASS (pass_rtl_cprop);
 348       NEXT_PASS (pass_rtl_store_motion);
 349       NEXT_PASS (pass_cse_after_global_opts);
 350       NEXT_PASS (pass_rtl_ifcvt);
 351       NEXT_PASS (pass_reginfo_init);
 352       /* Perform loop optimizations.  It might be better to do them a bit
 353          sooner, but we want the profile feedback to work more
 354          efficiently.  */
 355       NEXT_PASS (pass_loop2);
 356       PUSH_INSERT_PASSES_WITHIN (pass_loop2)
 357           NEXT_PASS (pass_rtl_loop_init);
 358           NEXT_PASS (pass_rtl_move_loop_invariants);
 359           NEXT_PASS (pass_rtl_unroll_and_peel_loops);
 360           NEXT_PASS (pass_rtl_doloop);
 361           NEXT_PASS (pass_rtl_loop_done);
 362           TERMINATE_PASS_LIST ()
 363       POP_INSERT_PASSES ()
 364       NEXT_PASS (pass_web);
 365       NEXT_PASS (pass_rtl_cprop);
 366       NEXT_PASS (pass_cse2);
 367       NEXT_PASS (pass_rtl_dse1);
 368       NEXT_PASS (pass_rtl_fwprop_addr);
 369       NEXT_PASS (pass_inc_dec);
 370       NEXT_PASS (pass_initialize_regs);
 371       NEXT_PASS (pass_ud_rtl_dce);
 372       NEXT_PASS (pass_combine);
 373       NEXT_PASS (pass_if_after_combine);
 374       NEXT_PASS (pass_partition_blocks);
 375       NEXT_PASS (pass_outof_cfg_layout_mode);
 376       NEXT_PASS (pass_split_all_insns);
 377       NEXT_PASS (pass_lower_subreg2);
 378       NEXT_PASS (pass_df_initialize_no_opt);
 379       NEXT_PASS (pass_stack_ptr_mod);
 380       NEXT_PASS (pass_mode_switching);
 381       NEXT_PASS (pass_match_asm_constraints);
 382       NEXT_PASS (pass_sms);
 383       NEXT_PASS (pass_live_range_shrinkage);
 384       NEXT_PASS (pass_sched);
 385       NEXT_PASS (pass_ira);
 386       NEXT_PASS (pass_reload);
 387       NEXT_PASS (pass_postreload);
 388       PUSH_INSERT_PASSES_WITHIN (pass_postreload)
 389           NEXT_PASS (pass_postreload_cse);
 390           NEXT_PASS (pass_gcse2);
 391           NEXT_PASS (pass_split_after_reload);
 392           NEXT_PASS (pass_ree);
 393           NEXT_PASS (pass_compare_elim_after_reload);
 394           NEXT_PASS (pass_branch_target_load_optimize1);
 395           NEXT_PASS (pass_thread_prologue_and_epilogue);
 396           NEXT_PASS (pass_rtl_dse2);
 397           NEXT_PASS (pass_stack_adjustments);
 398           NEXT_PASS (pass_jump2);
 399           NEXT_PASS (pass_duplicate_computed_gotos);
 400           NEXT_PASS (pass_peephole2);
 401           NEXT_PASS (pass_if_after_reload);
 402           NEXT_PASS (pass_regrename);
 403           NEXT_PASS (pass_cprop_hardreg);
 404           NEXT_PASS (pass_fast_rtl_dce);
 405           NEXT_PASS (pass_reorder_blocks);
 406           NEXT_PASS (pass_branch_target_load_optimize2);
 407           NEXT_PASS (pass_leaf_regs);
 408           NEXT_PASS (pass_split_before_sched2);
 409           NEXT_PASS (pass_sched2);
 410           NEXT_PASS (pass_stack_regs);
 411           PUSH_INSERT_PASSES_WITHIN (pass_stack_regs)
 412               NEXT_PASS (pass_split_before_regstack);
 413               NEXT_PASS (pass_stack_regs_run);
 414           POP_INSERT_PASSES ()
 415           NEXT_PASS (pass_compute_alignments);
 416           NEXT_PASS (pass_variable_tracking);
 417           NEXT_PASS (pass_free_cfg);
 418           NEXT_PASS (pass_machine_reorg);
 419           NEXT_PASS (pass_cleanup_barriers);
 420           NEXT_PASS (pass_delay_slots);
 421           NEXT_PASS (pass_split_for_shorten_branches);
 422           NEXT_PASS (pass_convert_to_eh_region_ranges);
 423           NEXT_PASS (pass_shorten_branches);
 424           NEXT_PASS (pass_set_nothrow_function_flags);
 425           NEXT_PASS (pass_dwarf2_frame);
 426           NEXT_PASS (pass_final);
 427       POP_INSERT_PASSES ()
 428       NEXT_PASS (pass_df_finish);
 429   POP_INSERT_PASSES ()
 430   NEXT_PASS (pass_clean_state);
 431   TERMINATE_PASS_LIST ()