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_icf);
 107   NEXT_PASS (pass_ipa_devirt);
 108   NEXT_PASS (pass_ipa_cp);
 109   NEXT_PASS (pass_ipa_cdtor_merge);
 110   NEXT_PASS (pass_ipa_inline);
 111   NEXT_PASS (pass_ipa_pure_const);
 112   NEXT_PASS (pass_ipa_reference);
 113   /* This pass needs to be scheduled after any IP code duplication.   */
 114   NEXT_PASS (pass_ipa_single_use);
 115   /* Comdat privatization come last, as direct references to comdat local
 116      symbols are not allowed outside of the comdat group.  Privatizing early
 117      would result in missed optimizations due to this restriction.  */
 118   NEXT_PASS (pass_ipa_comdats);
 119   TERMINATE_PASS_LIST ()
 120
 121   /* Simple IPA passes executed after the regular passes.  In WHOPR mode the
 122      passes are executed after partitioning and thus see just parts of the
 123      compiled unit.  */
 124   INSERT_PASSES_AFTER (all_late_ipa_passes)
 125   NEXT_PASS (pass_ipa_pta);
 126   NEXT_PASS (pass_omp_simd_clone);
 127   TERMINATE_PASS_LIST ()
 128
 129   /* These passes are run after IPA passes on every function that is being
 130      output to the assembler file.  */
 131   INSERT_PASSES_AFTER (all_passes)
 132   NEXT_PASS (pass_fixup_cfg);
 133   NEXT_PASS (pass_lower_eh_dispatch);
 134   NEXT_PASS (pass_all_optimizations);
 135   PUSH_INSERT_PASSES_WITHIN (pass_all_optimizations)
 136       NEXT_PASS (pass_remove_cgraph_callee_edges);
 137       /* Initial scalar cleanups before alias computation.
 138          They ensure memory accesses are not indirect wherever possible.  */
 139       NEXT_PASS (pass_strip_predict_hints);
 140       NEXT_PASS (pass_rename_ssa_copies);
 141       NEXT_PASS (pass_ccp);
 142       /* After CCP we rewrite no longer addressed locals into SSA
 143          form if possible.  */
 144       NEXT_PASS (pass_copy_prop);
 145       NEXT_PASS (pass_complete_unrolli);
 146       NEXT_PASS (pass_phiprop);
 147       NEXT_PASS (pass_forwprop);
 148       NEXT_PASS (pass_object_sizes);
 149       /* pass_build_alias is a dummy pass that ensures that we
 150          execute TODO_rebuild_alias at this point.  */
 151       NEXT_PASS (pass_build_alias);
 152       NEXT_PASS (pass_return_slot);
 153       NEXT_PASS (pass_fre);
 154       NEXT_PASS (pass_merge_phi);
 155       NEXT_PASS (pass_vrp);
 156       NEXT_PASS (pass_dce);
 157       NEXT_PASS (pass_call_cdce);
 158       NEXT_PASS (pass_cselim);
 159       NEXT_PASS (pass_copy_prop);
 160       NEXT_PASS (pass_tree_ifcombine);
 161       NEXT_PASS (pass_phiopt);
 162       NEXT_PASS (pass_tail_recursion);
 163       NEXT_PASS (pass_ch);
 164       NEXT_PASS (pass_stdarg);
 165       NEXT_PASS (pass_lower_complex);
 166       NEXT_PASS (pass_sra);
 167       NEXT_PASS (pass_rename_ssa_copies);
 168       /* The dom pass will also resolve all __builtin_constant_p calls
 169          that are still there to 0.  This has to be done after some
 170          propagations have already run, but before some more dead code
 171          is removed, and this place fits nicely.  Remember this when
 172          trying to move or duplicate pass_dominator somewhere earlier.  */
 173       NEXT_PASS (pass_dominator);
 174       /* At this point the majority of const/copy propagations
 175          are exposed.  Go ahead and identify paths that should never
 176          be executed in a conforming program and isolate those paths.
 177
 178          This will expose more degenerate PHIs in the main path and
 179          expose more PRE/DOM optimization opportunities.  */
 180       NEXT_PASS (pass_isolate_erroneous_paths);
 181       /* The only const/copy propagation opportunities left after
 182          DOM and erroneous path isolation should be due to degenerate PHI nodes.
 183          So rather than run the full propagators, run a specialized pass which
 184          only examines PHIs to discover const/copy propagation
 185          opportunities.  */
 186       NEXT_PASS (pass_phi_only_cprop);
 187       NEXT_PASS (pass_dse);
 188       NEXT_PASS (pass_reassoc);
 189       NEXT_PASS (pass_dce);
 190       NEXT_PASS (pass_forwprop);
 191       NEXT_PASS (pass_phiopt);
 192       NEXT_PASS (pass_ccp);
 193       /* After CCP we rewrite no longer addressed locals into SSA
 194          form if possible.  */
 195       NEXT_PASS (pass_copy_prop);
 196       NEXT_PASS (pass_cse_sincos);
 197       NEXT_PASS (pass_optimize_bswap);
 198       NEXT_PASS (pass_split_crit_edges);
 199       NEXT_PASS (pass_pre);
 200       NEXT_PASS (pass_sink_code);
 201       NEXT_PASS (pass_asan);
 202       NEXT_PASS (pass_tsan);
 203       /* Pass group that runs when 1) enabled, 2) there are loops
 204          in the function.  Make sure to run pass_fix_loops before
 205          to discover/remove loops before running the gate function
 206          of pass_tree_loop.  */
 207       NEXT_PASS (pass_fix_loops);
 208       NEXT_PASS (pass_tree_loop);
 209       PUSH_INSERT_PASSES_WITHIN (pass_tree_loop)
 210           NEXT_PASS (pass_tree_loop_init);
 211           NEXT_PASS (pass_lim);
 212           NEXT_PASS (pass_copy_prop);
 213           NEXT_PASS (pass_dce);
 214           NEXT_PASS (pass_tree_unswitch);
 215           NEXT_PASS (pass_scev_cprop);
 216           NEXT_PASS (pass_record_bounds);
 217           NEXT_PASS (pass_check_data_deps);
 218           NEXT_PASS (pass_loop_distribution);
 219           NEXT_PASS (pass_copy_prop);
 220           NEXT_PASS (pass_graphite);
 221           PUSH_INSERT_PASSES_WITHIN (pass_graphite)
 222               NEXT_PASS (pass_graphite_transforms);
 223               NEXT_PASS (pass_lim);
 224               NEXT_PASS (pass_copy_prop);
 225               NEXT_PASS (pass_dce);
 226           POP_INSERT_PASSES ()
 227           NEXT_PASS (pass_iv_canon);
 228           NEXT_PASS (pass_parallelize_loops);
 229           NEXT_PASS (pass_if_conversion);
 230           /* pass_vectorize must immediately follow pass_if_conversion.
 231              Please do not add any other passes in between.  */
 232           NEXT_PASS (pass_vectorize);
 233           PUSH_INSERT_PASSES_WITHIN (pass_vectorize)
 234               NEXT_PASS (pass_dce);
 235           POP_INSERT_PASSES ()
 236           NEXT_PASS (pass_predcom);
 237           NEXT_PASS (pass_complete_unroll);
 238           NEXT_PASS (pass_slp_vectorize);
 239           NEXT_PASS (pass_loop_prefetch);
 240           /* Run IVOPTs after the last pass that uses data-reference analysis
 241              as that doesn't handle TARGET_MEM_REFs.  */
 242           NEXT_PASS (pass_iv_optimize);
 243           NEXT_PASS (pass_lim);
 244           NEXT_PASS (pass_tree_loop_done);
 245       POP_INSERT_PASSES ()
 246       /* Pass group that runs when pass_tree_loop is disabled or there
 247          are no loops in the function.  */
 248       NEXT_PASS (pass_tree_no_loop);
 249       PUSH_INSERT_PASSES_WITHIN (pass_tree_no_loop)
 250           NEXT_PASS (pass_slp_vectorize);
 251       POP_INSERT_PASSES ()
 252       NEXT_PASS (pass_lower_vector_ssa);
 253       NEXT_PASS (pass_cse_reciprocals);
 254       NEXT_PASS (pass_reassoc);
 255       NEXT_PASS (pass_strength_reduction);
 256       NEXT_PASS (pass_tracer);
 257       NEXT_PASS (pass_dominator);
 258       NEXT_PASS (pass_strlen);
 259       NEXT_PASS (pass_vrp);
 260       /* The only const/copy propagation opportunities left after
 261          DOM and VRP should be due to degenerate PHI nodes.  So rather than
 262          run the full propagators, run a specialized pass which
 263          only examines PHIs to discover const/copy propagation
 264          opportunities.  */
 265       NEXT_PASS (pass_phi_only_cprop);
 266       NEXT_PASS (pass_cd_dce);
 267       NEXT_PASS (pass_dse);
 268       NEXT_PASS (pass_forwprop);
 269       NEXT_PASS (pass_phiopt);
 270       NEXT_PASS (pass_fold_builtins);
 271       NEXT_PASS (pass_optimize_widening_mul);
 272       NEXT_PASS (pass_tail_calls);
 273       NEXT_PASS (pass_rename_ssa_copies);
 274       /* FIXME: If DCE is not run before checking for uninitialized uses,
 275          we may get false warnings (e.g., testsuite/gcc.dg/uninit-5.c).
 276          However, this also causes us to misdiagnose cases that should be
 277          real warnings (e.g., testsuite/gcc.dg/pr18501.c).
 278
 279          To fix the false positives in uninit-5.c, we would have to
 280          account for the predicates protecting the set and the use of each
 281          variable.  Using a representation like Gated Single Assignment
 282          may help.  */
 283       /* Split critical edges before late uninit warning to reduce the
 284          number of false positives from it.  */
 285       NEXT_PASS (pass_split_crit_edges);
 286       NEXT_PASS (pass_late_warn_uninitialized);
 287       NEXT_PASS (pass_uncprop);
 288       NEXT_PASS (pass_local_pure_const);
 289   POP_INSERT_PASSES ()
 290   NEXT_PASS (pass_all_optimizations_g);
 291   PUSH_INSERT_PASSES_WITHIN (pass_all_optimizations_g)
 292       NEXT_PASS (pass_remove_cgraph_callee_edges);
 293       NEXT_PASS (pass_strip_predict_hints);
 294       /* Lower remaining pieces of GIMPLE.  */
 295       NEXT_PASS (pass_lower_complex);
 296       NEXT_PASS (pass_lower_vector_ssa);
 297       /* Perform simple scalar cleanup which is constant/copy propagation.  */
 298       NEXT_PASS (pass_ccp);
 299       NEXT_PASS (pass_object_sizes);
 300       /* Fold remaining builtins.  */
 301       NEXT_PASS (pass_fold_builtins);
 302       /* Copy propagation also copy-propagates constants, this is necessary
 303          to forward object-size and builtin folding results properly.  */
 304       NEXT_PASS (pass_copy_prop);
 305       NEXT_PASS (pass_dce);
 306       NEXT_PASS (pass_asan);
 307       NEXT_PASS (pass_tsan);
 308       NEXT_PASS (pass_rename_ssa_copies);
 309       /* ???  We do want some kind of loop invariant motion, but we possibly
 310          need to adjust LIM to be more friendly towards preserving accurate
 311          debug information here.  */
 312       /* Split critical edges before late uninit warning to reduce the
 313          number of false positives from it.  */
 314       NEXT_PASS (pass_split_crit_edges);
 315       NEXT_PASS (pass_late_warn_uninitialized);
 316       NEXT_PASS (pass_uncprop);
 317       NEXT_PASS (pass_local_pure_const);
 318   POP_INSERT_PASSES ()
 319   NEXT_PASS (pass_tm_init);
 320   PUSH_INSERT_PASSES_WITHIN (pass_tm_init)
 321       NEXT_PASS (pass_tm_mark);
 322       NEXT_PASS (pass_tm_memopt);
 323       NEXT_PASS (pass_tm_edges);
 324   POP_INSERT_PASSES ()
 325   NEXT_PASS (pass_vtable_verify);
 326   NEXT_PASS (pass_lower_vector);
 327   NEXT_PASS (pass_lower_complex_O0);
 328   NEXT_PASS (pass_asan_O0);
 329   NEXT_PASS (pass_tsan_O0);
 330   NEXT_PASS (pass_sanopt);
 331   NEXT_PASS (pass_cleanup_eh);
 332   NEXT_PASS (pass_lower_resx);
 333   NEXT_PASS (pass_nrv);
 334   NEXT_PASS (pass_cleanup_cfg_post_optimizing);
 335   NEXT_PASS (pass_warn_function_noreturn);
 336
 337   NEXT_PASS (pass_expand);
 338
 339   NEXT_PASS (pass_rest_of_compilation);
 340   PUSH_INSERT_PASSES_WITHIN (pass_rest_of_compilation)
 341       NEXT_PASS (pass_instantiate_virtual_regs);
 342       NEXT_PASS (pass_into_cfg_layout_mode);
 343       NEXT_PASS (pass_jump);
 344       NEXT_PASS (pass_lower_subreg);
 345       NEXT_PASS (pass_df_initialize_opt);
 346       NEXT_PASS (pass_cse);
 347       NEXT_PASS (pass_rtl_fwprop);
 348       NEXT_PASS (pass_rtl_cprop);
 349       NEXT_PASS (pass_rtl_pre);
 350       NEXT_PASS (pass_rtl_hoist);
 351       NEXT_PASS (pass_rtl_cprop);
 352       NEXT_PASS (pass_rtl_store_motion);
 353       NEXT_PASS (pass_cse_after_global_opts);
 354       NEXT_PASS (pass_rtl_ifcvt);
 355       NEXT_PASS (pass_reginfo_init);
 356       /* Perform loop optimizations.  It might be better to do them a bit
 357          sooner, but we want the profile feedback to work more
 358          efficiently.  */
 359       NEXT_PASS (pass_loop2);
 360       PUSH_INSERT_PASSES_WITHIN (pass_loop2)
 361           NEXT_PASS (pass_rtl_loop_init);
 362           NEXT_PASS (pass_rtl_move_loop_invariants);
 363           NEXT_PASS (pass_rtl_unroll_loops);
 364           NEXT_PASS (pass_rtl_doloop);
 365           NEXT_PASS (pass_rtl_loop_done);
 366           TERMINATE_PASS_LIST ()
 367       POP_INSERT_PASSES ()
 368       NEXT_PASS (pass_web);
 369       NEXT_PASS (pass_rtl_cprop);
 370       NEXT_PASS (pass_cse2);
 371       NEXT_PASS (pass_rtl_dse1);
 372       NEXT_PASS (pass_rtl_fwprop_addr);
 373       NEXT_PASS (pass_inc_dec);
 374       NEXT_PASS (pass_initialize_regs);
 375       NEXT_PASS (pass_ud_rtl_dce);
 376       NEXT_PASS (pass_combine);
 377       NEXT_PASS (pass_if_after_combine);
 378       NEXT_PASS (pass_partition_blocks);
 379       NEXT_PASS (pass_outof_cfg_layout_mode);
 380       NEXT_PASS (pass_split_all_insns);
 381       NEXT_PASS (pass_lower_subreg2);
 382       NEXT_PASS (pass_df_initialize_no_opt);
 383       NEXT_PASS (pass_stack_ptr_mod);
 384       NEXT_PASS (pass_mode_switching);
 385       NEXT_PASS (pass_match_asm_constraints);
 386       NEXT_PASS (pass_sms);
 387       NEXT_PASS (pass_live_range_shrinkage);
 388       NEXT_PASS (pass_sched);
 389       NEXT_PASS (pass_ira);
 390       NEXT_PASS (pass_reload);
 391       NEXT_PASS (pass_postreload);
 392       PUSH_INSERT_PASSES_WITHIN (pass_postreload)
 393           NEXT_PASS (pass_postreload_cse);
 394           NEXT_PASS (pass_gcse2);
 395           NEXT_PASS (pass_split_after_reload);
 396           NEXT_PASS (pass_ree);
 397           NEXT_PASS (pass_compare_elim_after_reload);
 398           NEXT_PASS (pass_branch_target_load_optimize1);
 399           NEXT_PASS (pass_thread_prologue_and_epilogue);
 400           NEXT_PASS (pass_rtl_dse2);
 401           NEXT_PASS (pass_stack_adjustments);
 402           NEXT_PASS (pass_jump2);
 403           NEXT_PASS (pass_duplicate_computed_gotos);
 404           NEXT_PASS (pass_peephole2);
 405           NEXT_PASS (pass_if_after_reload);
 406           NEXT_PASS (pass_regrename);
 407           NEXT_PASS (pass_cprop_hardreg);
 408           NEXT_PASS (pass_fast_rtl_dce);
 409           NEXT_PASS (pass_reorder_blocks);
 410           NEXT_PASS (pass_branch_target_load_optimize2);
 411           NEXT_PASS (pass_leaf_regs);
 412           NEXT_PASS (pass_split_before_sched2);
 413           NEXT_PASS (pass_sched2);
 414           NEXT_PASS (pass_stack_regs);
 415           PUSH_INSERT_PASSES_WITHIN (pass_stack_regs)
 416               NEXT_PASS (pass_split_before_regstack);
 417               NEXT_PASS (pass_stack_regs_run);
 418           POP_INSERT_PASSES ()
 419           NEXT_PASS (pass_compute_alignments);
 420           NEXT_PASS (pass_variable_tracking);
 421           NEXT_PASS (pass_free_cfg);
 422           NEXT_PASS (pass_machine_reorg);
 423           NEXT_PASS (pass_cleanup_barriers);
 424           NEXT_PASS (pass_delay_slots);
 425           NEXT_PASS (pass_split_for_shorten_branches);
 426           NEXT_PASS (pass_convert_to_eh_region_ranges);
 427           NEXT_PASS (pass_shorten_branches);
 428           NEXT_PASS (pass_set_nothrow_function_flags);
 429           NEXT_PASS (pass_dwarf2_frame);
 430           NEXT_PASS (pass_final);
 431       POP_INSERT_PASSES ()
 432       NEXT_PASS (pass_df_finish);
 433   POP_INSERT_PASSES ()
 434   NEXT_PASS (pass_clean_state);
 435   TERMINATE_PASS_LIST ()