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.  Make sure to run pass_fix_loops before
 204          to discover/remove loops before running the gate function
 205          of pass_tree_loop.  */
 206       NEXT_PASS (pass_fix_loops);
 207       NEXT_PASS (pass_tree_loop);
 208       PUSH_INSERT_PASSES_WITHIN (pass_tree_loop)
 209           NEXT_PASS (pass_tree_loop_init);
 210           NEXT_PASS (pass_lim);
 211           NEXT_PASS (pass_copy_prop);
 212           NEXT_PASS (pass_dce);
 213           NEXT_PASS (pass_tree_unswitch);
 214           NEXT_PASS (pass_scev_cprop);
 215           NEXT_PASS (pass_record_bounds);
 216           NEXT_PASS (pass_check_data_deps);
 217           NEXT_PASS (pass_loop_distribution);
 218           NEXT_PASS (pass_copy_prop);
 219           NEXT_PASS (pass_graphite);
 220           PUSH_INSERT_PASSES_WITHIN (pass_graphite)
 221               NEXT_PASS (pass_graphite_transforms);
 222               NEXT_PASS (pass_lim);
 223               NEXT_PASS (pass_copy_prop);
 224               NEXT_PASS (pass_dce);
 225           POP_INSERT_PASSES ()
 226           NEXT_PASS (pass_iv_canon);
 227           NEXT_PASS (pass_parallelize_loops);
 228           NEXT_PASS (pass_if_conversion);
 229           /* pass_vectorize must immediately follow pass_if_conversion.
 230              Please do not add any other passes in between.  */
 231           NEXT_PASS (pass_vectorize);
 232           PUSH_INSERT_PASSES_WITHIN (pass_vectorize)
 233               NEXT_PASS (pass_dce);
 234           POP_INSERT_PASSES ()
 235           NEXT_PASS (pass_predcom);
 236           NEXT_PASS (pass_complete_unroll);
 237           NEXT_PASS (pass_slp_vectorize);
 238           NEXT_PASS (pass_loop_prefetch);
 239           /* Run IVOPTs after the last pass that uses data-reference analysis
 240              as that doesn't handle TARGET_MEM_REFs.  */
 241           NEXT_PASS (pass_iv_optimize);
 242           NEXT_PASS (pass_lim);
 243           NEXT_PASS (pass_tree_loop_done);
 244       POP_INSERT_PASSES ()
 245       /* Pass group that runs when pass_tree_loop is disabled or there
 246          are no loops in the function.  */
 247       NEXT_PASS (pass_tree_no_loop);
 248       PUSH_INSERT_PASSES_WITHIN (pass_tree_no_loop)
 249           NEXT_PASS (pass_slp_vectorize);
 250       POP_INSERT_PASSES ()
 251       NEXT_PASS (pass_lower_vector_ssa);
 252       NEXT_PASS (pass_cse_reciprocals);
 253       NEXT_PASS (pass_reassoc);
 254       NEXT_PASS (pass_strength_reduction);
 255       NEXT_PASS (pass_dominator);
 256       NEXT_PASS (pass_strlen);
 257       NEXT_PASS (pass_vrp);
 258       /* The only const/copy propagation opportunities left after
 259          DOM and VRP should be due to degenerate PHI nodes.  So rather than
 260          run the full propagators, run a specialized pass which
 261          only examines PHIs to discover const/copy propagation
 262          opportunities.  */
 263       NEXT_PASS (pass_phi_only_cprop);
 264       NEXT_PASS (pass_cd_dce);
 265       NEXT_PASS (pass_tracer);
 266       NEXT_PASS (pass_dse);
 267       NEXT_PASS (pass_forwprop);
 268       NEXT_PASS (pass_phiopt);
 269       NEXT_PASS (pass_fold_builtins);
 270       NEXT_PASS (pass_optimize_widening_mul);
 271       NEXT_PASS (pass_tail_calls);
 272       NEXT_PASS (pass_rename_ssa_copies);
 273       /* FIXME: If DCE is not run before checking for uninitialized uses,
 274          we may get false warnings (e.g., testsuite/gcc.dg/uninit-5.c).
 275          However, this also causes us to misdiagnose cases that should be
 276          real warnings (e.g., testsuite/gcc.dg/pr18501.c).
 277
 278          To fix the false positives in uninit-5.c, we would have to
 279          account for the predicates protecting the set and the use of each
 280          variable.  Using a representation like Gated Single Assignment
 281          may help.  */
 282       /* Split critical edges before late uninit warning to reduce the
 283          number of false positives from it.  */
 284       NEXT_PASS (pass_split_crit_edges);
 285       NEXT_PASS (pass_late_warn_uninitialized);
 286       NEXT_PASS (pass_uncprop);
 287       NEXT_PASS (pass_local_pure_const);
 288   POP_INSERT_PASSES ()
 289   NEXT_PASS (pass_all_optimizations_g);
 290   PUSH_INSERT_PASSES_WITHIN (pass_all_optimizations_g)
 291       NEXT_PASS (pass_remove_cgraph_callee_edges);
 292       NEXT_PASS (pass_strip_predict_hints);
 293       /* Lower remaining pieces of GIMPLE.  */
 294       NEXT_PASS (pass_lower_complex);
 295       NEXT_PASS (pass_lower_vector_ssa);
 296       /* Perform simple scalar cleanup which is constant/copy propagation.  */
 297       NEXT_PASS (pass_ccp);
 298       NEXT_PASS (pass_object_sizes);
 299       /* Fold remaining builtins.  */
 300       NEXT_PASS (pass_fold_builtins);
 301       /* Copy propagation also copy-propagates constants, this is necessary
 302          to forward object-size and builtin folding results properly.  */
 303       NEXT_PASS (pass_copy_prop);
 304       NEXT_PASS (pass_dce);
 305       NEXT_PASS (pass_asan);
 306       NEXT_PASS (pass_tsan);
 307       NEXT_PASS (pass_rename_ssa_copies);
 308       /* ???  We do want some kind of loop invariant motion, but we possibly
 309          need to adjust LIM to be more friendly towards preserving accurate
 310          debug information here.  */
 311       /* Split critical edges before late uninit warning to reduce the
 312          number of false positives from it.  */
 313       NEXT_PASS (pass_split_crit_edges);
 314       NEXT_PASS (pass_late_warn_uninitialized);
 315       NEXT_PASS (pass_uncprop);
 316       NEXT_PASS (pass_local_pure_const);
 317   POP_INSERT_PASSES ()
 318   NEXT_PASS (pass_tm_init);
 319   PUSH_INSERT_PASSES_WITHIN (pass_tm_init)
 320       NEXT_PASS (pass_tm_mark);
 321       NEXT_PASS (pass_tm_memopt);
 322       NEXT_PASS (pass_tm_edges);
 323   POP_INSERT_PASSES ()
 324   NEXT_PASS (pass_vtable_verify);
 325   NEXT_PASS (pass_lower_vector);
 326   NEXT_PASS (pass_lower_complex_O0);
 327   NEXT_PASS (pass_asan_O0);
 328   NEXT_PASS (pass_tsan_O0);
 329   NEXT_PASS (pass_sanopt);
 330   NEXT_PASS (pass_cleanup_eh);
 331   NEXT_PASS (pass_lower_resx);
 332   NEXT_PASS (pass_nrv);
 333   NEXT_PASS (pass_cleanup_cfg_post_optimizing);
 334   NEXT_PASS (pass_warn_function_noreturn);
 335
 336   NEXT_PASS (pass_expand);
 337
 338   NEXT_PASS (pass_rest_of_compilation);
 339   PUSH_INSERT_PASSES_WITHIN (pass_rest_of_compilation)
 340       NEXT_PASS (pass_instantiate_virtual_regs);
 341       NEXT_PASS (pass_into_cfg_layout_mode);
 342       NEXT_PASS (pass_jump);
 343       NEXT_PASS (pass_lower_subreg);
 344       NEXT_PASS (pass_df_initialize_opt);
 345       NEXT_PASS (pass_cse);
 346       NEXT_PASS (pass_rtl_fwprop);
 347       NEXT_PASS (pass_rtl_cprop);
 348       NEXT_PASS (pass_rtl_pre);
 349       NEXT_PASS (pass_rtl_hoist);
 350       NEXT_PASS (pass_rtl_cprop);
 351       NEXT_PASS (pass_rtl_store_motion);
 352       NEXT_PASS (pass_cse_after_global_opts);
 353       NEXT_PASS (pass_rtl_ifcvt);
 354       NEXT_PASS (pass_reginfo_init);
 355       /* Perform loop optimizations.  It might be better to do them a bit
 356          sooner, but we want the profile feedback to work more
 357          efficiently.  */
 358       NEXT_PASS (pass_loop2);
 359       PUSH_INSERT_PASSES_WITHIN (pass_loop2)
 360           NEXT_PASS (pass_rtl_loop_init);
 361           NEXT_PASS (pass_rtl_move_loop_invariants);
 362           NEXT_PASS (pass_rtl_unroll_and_peel_loops);
 363           NEXT_PASS (pass_rtl_doloop);
 364           NEXT_PASS (pass_rtl_loop_done);
 365           TERMINATE_PASS_LIST ()
 366       POP_INSERT_PASSES ()
 367       NEXT_PASS (pass_web);
 368       NEXT_PASS (pass_rtl_cprop);
 369       NEXT_PASS (pass_cse2);
 370       NEXT_PASS (pass_rtl_dse1);
 371       NEXT_PASS (pass_rtl_fwprop_addr);
 372       NEXT_PASS (pass_inc_dec);
 373       NEXT_PASS (pass_initialize_regs);
 374       NEXT_PASS (pass_ud_rtl_dce);
 375       NEXT_PASS (pass_combine);
 376       NEXT_PASS (pass_if_after_combine);
 377       NEXT_PASS (pass_partition_blocks);
 378       NEXT_PASS (pass_outof_cfg_layout_mode);
 379       NEXT_PASS (pass_split_all_insns);
 380       NEXT_PASS (pass_lower_subreg2);
 381       NEXT_PASS (pass_df_initialize_no_opt);
 382       NEXT_PASS (pass_stack_ptr_mod);
 383       NEXT_PASS (pass_mode_switching);
 384       NEXT_PASS (pass_match_asm_constraints);
 385       NEXT_PASS (pass_sms);
 386       NEXT_PASS (pass_live_range_shrinkage);
 387       NEXT_PASS (pass_sched);
 388       NEXT_PASS (pass_ira);
 389       NEXT_PASS (pass_reload);
 390       NEXT_PASS (pass_postreload);
 391       PUSH_INSERT_PASSES_WITHIN (pass_postreload)
 392           NEXT_PASS (pass_postreload_cse);
 393           NEXT_PASS (pass_gcse2);
 394           NEXT_PASS (pass_split_after_reload);
 395           NEXT_PASS (pass_ree);
 396           NEXT_PASS (pass_compare_elim_after_reload);
 397           NEXT_PASS (pass_branch_target_load_optimize1);
 398           NEXT_PASS (pass_thread_prologue_and_epilogue);
 399           NEXT_PASS (pass_rtl_dse2);
 400           NEXT_PASS (pass_stack_adjustments);
 401           NEXT_PASS (pass_jump2);
 402           NEXT_PASS (pass_duplicate_computed_gotos);
 403           NEXT_PASS (pass_peephole2);
 404           NEXT_PASS (pass_if_after_reload);
 405           NEXT_PASS (pass_regrename);
 406           NEXT_PASS (pass_cprop_hardreg);
 407           NEXT_PASS (pass_fast_rtl_dce);
 408           NEXT_PASS (pass_reorder_blocks);
 409           NEXT_PASS (pass_branch_target_load_optimize2);
 410           NEXT_PASS (pass_leaf_regs);
 411           NEXT_PASS (pass_split_before_sched2);
 412           NEXT_PASS (pass_sched2);
 413           NEXT_PASS (pass_stack_regs);
 414           PUSH_INSERT_PASSES_WITHIN (pass_stack_regs)
 415               NEXT_PASS (pass_split_before_regstack);
 416               NEXT_PASS (pass_stack_regs_run);
 417           POP_INSERT_PASSES ()
 418           NEXT_PASS (pass_compute_alignments);
 419           NEXT_PASS (pass_variable_tracking);
 420           NEXT_PASS (pass_free_cfg);
 421           NEXT_PASS (pass_machine_reorg);
 422           NEXT_PASS (pass_cleanup_barriers);
 423           NEXT_PASS (pass_delay_slots);
 424           NEXT_PASS (pass_split_for_shorten_branches);
 425           NEXT_PASS (pass_convert_to_eh_region_ranges);
 426           NEXT_PASS (pass_shorten_branches);
 427           NEXT_PASS (pass_set_nothrow_function_flags);
 428           NEXT_PASS (pass_dwarf2_frame);
 429           NEXT_PASS (pass_final);
 430       POP_INSERT_PASSES ()
 431       NEXT_PASS (pass_df_finish);
 432   POP_INSERT_PASSES ()
 433   NEXT_PASS (pass_clean_state);
 434   TERMINATE_PASS_LIST ()