X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Floop-init.c;h=a1a91639dc4c8c504d3f3fb65be26156d0f8a2e8;hb=d8da63856ff9dca5913e4b9b26e2fa25ddeb7db3;hp=19d53e112bd799712dbd1cbff08ad72a248be58b;hpb=f9cce2dcaaf2f076df995c819b410d07d8636c04;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/loop-init.c b/gcc/loop-init.c index 19d53e112bd..a1a91639dc4 100644 --- a/gcc/loop-init.c +++ b/gcc/loop-init.c @@ -1,11 +1,12 @@ -/* Loop optimizer initialization routines. - Copyright (C) 2002, 2003 Free Software Foundation, Inc. +/* Loop optimizer initialization routines and RTL loop optimization passes. + Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 + Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free -Software Foundation; either version 2, or (at your option) any later +Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY @@ -14,9 +15,8 @@ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License -along with GCC; see the file COPYING. If not, write to the Free -Software Foundation, 59 Temple Place - Suite 330, Boston, MA -02111-1307, USA. */ +along with GCC; see the file COPYING3. If not see +. */ #include "config.h" #include "system.h" @@ -24,85 +24,379 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "tm.h" #include "rtl.h" #include "hard-reg-set.h" +#include "obstack.h" #include "basic-block.h" #include "cfgloop.h" #include "cfglayout.h" +#include "tree-pass.h" +#include "timevar.h" +#include "flags.h" +#include "df.h" +#include "ggc.h" -/* Initialize loop optimizer. */ + +/* Initialize loop structures. This is used by the tree and RTL loop + optimizers. FLAGS specify what properties to compute and/or ensure for + loops. */ -struct loops * -loop_optimizer_init (FILE *dumpfile) +void +loop_optimizer_init (unsigned flags) { - struct loops *loops = xcalloc (1, sizeof (struct loops)); - edge e; + struct loops *loops; - /* Avoid annoying special cases of edges going to exit - block. */ - for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next) - if ((e->flags & EDGE_FALLTHRU) && e->src->succ->succ_next) - split_edge (e); + gcc_assert (!current_loops); + loops = GGC_CNEW (struct loops); /* Find the loops. */ - if (flow_loops_find (loops, LOOP_TREE) <= 1) - { - /* No loops. */ - flow_loops_free (loops); - free_dominance_info (CDI_DOMINATORS); - free (loops); + flow_loops_find (loops); + current_loops = loops; - return NULL; + if (flags & LOOPS_MAY_HAVE_MULTIPLE_LATCHES) + { + /* If the loops may have multiple latches, we cannot canonicalize + them further (and most of the loop manipulation functions will + not work). However, we avoid modifying cfg, which some + passes may want. */ + gcc_assert ((flags & ~(LOOPS_MAY_HAVE_MULTIPLE_LATCHES + | LOOPS_HAVE_RECORDED_EXITS)) == 0); + loops_state_set (LOOPS_MAY_HAVE_MULTIPLE_LATCHES); } - - /* Not going to update these. */ - free (loops->cfg.rc_order); - loops->cfg.rc_order = NULL; - free (loops->cfg.dfs_order); - loops->cfg.dfs_order = NULL; + else + disambiguate_loops_with_multiple_latches (); /* Create pre-headers. */ - create_preheaders (loops, CP_SIMPLE_PREHEADERS); + if (flags & LOOPS_HAVE_PREHEADERS) + { + int cp_flags = CP_SIMPLE_PREHEADERS; + + if (flags & LOOPS_HAVE_FALLTHRU_PREHEADERS) + cp_flags |= CP_FALLTHRU_PREHEADERS; + + create_preheaders (cp_flags); + } /* Force all latches to have only single successor. */ - force_single_succ_latches (loops); + if (flags & LOOPS_HAVE_SIMPLE_LATCHES) + force_single_succ_latches (); /* Mark irreducible loops. */ - mark_irreducible_loops (loops); + if (flags & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS) + mark_irreducible_loops (); + + if (flags & LOOPS_HAVE_RECORDED_EXITS) + record_loop_exits (); /* Dump loops. */ - flow_loops_dump (loops, dumpfile, NULL, 1); + flow_loops_dump (dump_file, NULL, 1); #ifdef ENABLE_CHECKING verify_dominators (CDI_DOMINATORS); - verify_loop_structure (loops); + verify_loop_structure (); #endif - - return loops; } -/* Finalize loop optimizer. */ +/* Finalize loop structures. */ + void -loop_optimizer_finalize (struct loops *loops, FILE *dumpfile) +loop_optimizer_finalize (void) { - unsigned i; + loop_iterator li; + struct loop *loop; + basic_block bb; - if (!loops) - return; + gcc_assert (current_loops != NULL); - for (i = 1; i < loops->num; i++) - if (loops->parray[i]) - free_simple_loop_desc (loops->parray[i]); - - /* Another dump. */ - flow_loops_dump (loops, dumpfile, NULL, 1); + FOR_EACH_LOOP (li, loop, 0) + { + free_simple_loop_desc (loop); + } /* Clean up. */ - flow_loops_free (loops); - free_dominance_info (CDI_DOMINATORS); - free (loops); + if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS)) + release_recorded_exits (); + flow_loops_free (current_loops); + ggc_free (current_loops); + current_loops = NULL; + + FOR_ALL_BB (bb) + { + bb->loop_father = NULL; + } /* Checking. */ #ifdef ENABLE_CHECKING - verify_flow_info (); + /* FIXME: no point to verify flow info after bundling on ia64. Use this + hack for achieving this. */ + if (!reload_completed) + verify_flow_info (); +#endif +} + + +/* Gate for the RTL loop superpass. The actual passes are subpasses. + See passes.c for more on that. */ + +static bool +gate_handle_loop2 (void) +{ + return (optimize > 0 + && (flag_move_loop_invariants + || flag_unswitch_loops + || flag_peel_loops + || flag_unroll_loops +#ifdef HAVE_doloop_end + || (flag_branch_on_count_reg && HAVE_doloop_end) +#endif + )); +} + +struct rtl_opt_pass pass_loop2 = +{ + { + RTL_PASS, + "loop2", /* name */ + gate_handle_loop2, /* gate */ + NULL, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | + TODO_ggc_collect /* todo_flags_finish */ + } +}; + + +/* Initialization of the RTL loop passes. */ +static unsigned int +rtl_loop_init (void) +{ + gcc_assert (current_ir_type () == IR_RTL_CFGLAYOUT); + + if (dump_file) + dump_flow_info (dump_file, dump_flags); + + loop_optimizer_init (LOOPS_NORMAL); + return 0; +} + +struct rtl_opt_pass pass_rtl_loop_init = +{ + { + RTL_PASS, + "loop2_init", /* name */ + NULL, /* gate */ + rtl_loop_init, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_rtl_sharing /* todo_flags_finish */ + } +}; + + +/* Finalization of the RTL loop passes. */ + +static unsigned int +rtl_loop_done (void) +{ + loop_optimizer_finalize (); + free_dominance_info (CDI_DOMINATORS); + + cleanup_cfg (0); + if (dump_file) + dump_flow_info (dump_file, dump_flags); + + return 0; +} + +struct rtl_opt_pass pass_rtl_loop_done = +{ + { + RTL_PASS, + "loop2_done", /* name */ + NULL, /* gate */ + rtl_loop_done, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_rtl_sharing /* todo_flags_finish */ + } +}; + + +/* Loop invariant code motion. */ +static bool +gate_rtl_move_loop_invariants (void) +{ + return flag_move_loop_invariants; +} + +static unsigned int +rtl_move_loop_invariants (void) +{ + if (number_of_loops () > 1) + move_loop_invariants (); + return 0; +} + +struct rtl_opt_pass pass_rtl_move_loop_invariants = +{ + { + RTL_PASS, + "loop2_invariant", /* name */ + gate_rtl_move_loop_invariants, /* gate */ + rtl_move_loop_invariants, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_df_verify | + TODO_df_finish | TODO_verify_rtl_sharing | + TODO_dump_func /* todo_flags_finish */ + } +}; + + +/* Loop unswitching for RTL. */ +static bool +gate_rtl_unswitch (void) +{ + return flag_unswitch_loops; +} + +static unsigned int +rtl_unswitch (void) +{ + if (number_of_loops () > 1) + unswitch_loops (); + return 0; +} + +struct rtl_opt_pass pass_rtl_unswitch = +{ + { + RTL_PASS, + "loop2_unswitch", /* name */ + gate_rtl_unswitch, /* gate */ + rtl_unswitch, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_rtl_sharing, /* todo_flags_finish */ + } +}; + + +/* Loop unswitching for RTL. */ +static bool +gate_rtl_unroll_and_peel_loops (void) +{ + return (flag_peel_loops || flag_unroll_loops || flag_unroll_all_loops); +} + +static unsigned int +rtl_unroll_and_peel_loops (void) +{ + if (number_of_loops () > 1) + { + int flags = 0; + if (dump_file) + df_dump (dump_file); + + if (flag_peel_loops) + flags |= UAP_PEEL; + if (flag_unroll_loops) + flags |= UAP_UNROLL; + if (flag_unroll_all_loops) + flags |= UAP_UNROLL_ALL; + + unroll_and_peel_loops (flags); + } + return 0; +} + +struct rtl_opt_pass pass_rtl_unroll_and_peel_loops = +{ + { + RTL_PASS, + "loop2_unroll", /* name */ + gate_rtl_unroll_and_peel_loops, /* gate */ + rtl_unroll_and_peel_loops, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_rtl_sharing, /* todo_flags_finish */ + } +}; + + +/* The doloop optimization. */ +static bool +gate_rtl_doloop (void) +{ +#ifdef HAVE_doloop_end + return (flag_branch_on_count_reg && HAVE_doloop_end); +#else + return 0; #endif } + +static unsigned int +rtl_doloop (void) +{ +#ifdef HAVE_doloop_end + if (number_of_loops () > 1) + doloop_optimize_loops (); +#endif + return 0; +} + +struct rtl_opt_pass pass_rtl_doloop = +{ + { + RTL_PASS, + "loop2_doloop", /* name */ + gate_rtl_doloop, /* gate */ + rtl_doloop, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LOOP, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_rtl_sharing /* todo_flags_finish */ + } +}; +