diff options
Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/tree-ssa-loop.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/tree-ssa-loop.c | 511 |
1 files changed, 511 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/tree-ssa-loop.c b/gcc-4.2.1-5666.3/gcc/tree-ssa-loop.c new file mode 100644 index 000000000..475f31e3b --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/tree-ssa-loop.c @@ -0,0 +1,511 @@ +/* Loop optimizations over tree-ssa. + Copyright (C) 2003, 2005 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 version. + +GCC is distributed in the hope that it will be useful, but WITHOUT +ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +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, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tm.h" +#include "tree.h" +#include "rtl.h" +#include "tm_p.h" +#include "hard-reg-set.h" +#include "basic-block.h" +#include "output.h" +#include "diagnostic.h" +#include "tree-flow.h" +#include "tree-dump.h" +#include "tree-pass.h" +#include "timevar.h" +#include "cfgloop.h" +#include "flags.h" +#include "tree-inline.h" +#include "tree-scalar-evolution.h" + +/* The loop tree currently optimized. */ + +struct loops *current_loops = NULL; + +/* Initializes the loop structures. */ + +static struct loops * +tree_loop_optimizer_init (void) +{ + struct loops *loops; + + loops = loop_optimizer_init (LOOPS_NORMAL + | LOOPS_HAVE_MARKED_SINGLE_EXITS); + + if (!loops) + return NULL; + + rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa); + + return loops; +} + +/* The loop superpass. */ + +static bool +gate_tree_loop (void) +{ + return flag_tree_loop_optimize != 0; +} + +struct tree_opt_pass pass_tree_loop = +{ + "loop", /* name */ + gate_tree_loop, /* gate */ + NULL, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP, /* tv_id */ + PROP_cfg, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + TODO_ggc_collect, /* todo_flags_start */ + TODO_dump_func | TODO_verify_ssa | TODO_ggc_collect, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Loop optimizer initialization. */ + +static unsigned int +tree_ssa_loop_init (void) +{ + current_loops = tree_loop_optimizer_init (); + if (!current_loops) + return 0; + + scev_initialize (current_loops); + return 0; +} + +struct tree_opt_pass pass_tree_loop_init = +{ + "loopinit", /* name */ + NULL, /* gate */ + tree_ssa_loop_init, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP_INIT, /* tv_id */ + PROP_cfg, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Loop invariant motion pass. */ + +static unsigned int +tree_ssa_loop_im (void) +{ + if (!current_loops) + return 0; + + tree_ssa_lim (current_loops); + return 0; +} + +static bool +gate_tree_ssa_loop_im (void) +{ + return flag_tree_loop_im != 0; +} + +struct tree_opt_pass pass_lim = +{ + "lim", /* name */ + gate_tree_ssa_loop_im, /* gate */ + tree_ssa_loop_im, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_LIM, /* tv_id */ + PROP_cfg, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Loop unswitching pass. */ + +static unsigned int +tree_ssa_loop_unswitch (void) +{ + if (!current_loops) + return 0; + + return tree_ssa_unswitch_loops (current_loops); +} + +static bool +gate_tree_ssa_loop_unswitch (void) +{ + return flag_unswitch_loops != 0; +} + +struct tree_opt_pass pass_tree_unswitch = +{ + "unswitch", /* name */ + gate_tree_ssa_loop_unswitch, /* gate */ + tree_ssa_loop_unswitch, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP_UNSWITCH, /* tv_id */ + PROP_cfg, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Loop autovectorization. */ + +static unsigned int +tree_vectorize (void) +{ + vectorize_loops (current_loops); + return 0; +} + +static bool +gate_tree_vectorize (void) +{ + return flag_tree_vectorize && current_loops; +} + +struct tree_opt_pass pass_vectorize = +{ + "vect", /* name */ + gate_tree_vectorize, /* gate */ + tree_vectorize, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_VECTORIZATION, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + TODO_verify_loops, /* todo_flags_start */ + TODO_dump_func | TODO_update_ssa, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Loop nest optimizations. */ + +static unsigned int +tree_linear_transform (void) +{ + if (!current_loops) + return 0; + + linear_transform_loops (current_loops); + return 0; +} + +static bool +gate_tree_linear_transform (void) +{ + return flag_tree_loop_linear != 0; +} + +struct tree_opt_pass pass_linear_transform = +{ + "ltrans", /* name */ + gate_tree_linear_transform, /* gate */ + tree_linear_transform, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LINEAR_TRANSFORM, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Canonical induction variable creation pass. */ + +static unsigned int +tree_ssa_loop_ivcanon (void) +{ + if (!current_loops) + return 0; + + return canonicalize_induction_variables (current_loops); +} + +static bool +gate_tree_ssa_loop_ivcanon (void) +{ + return flag_tree_loop_ivcanon != 0; +} + +struct tree_opt_pass pass_iv_canon = +{ + "ivcanon", /* name */ + gate_tree_ssa_loop_ivcanon, /* gate */ + tree_ssa_loop_ivcanon, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP_IVCANON, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Propagation of constants using scev. */ + +static bool +gate_scev_const_prop (void) +{ + return true; +} + +struct tree_opt_pass pass_scev_cprop = +{ + "sccp", /* name */ + gate_scev_const_prop, /* gate */ + scev_const_prop, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_SCEV_CONST, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_cleanup_cfg + | TODO_update_ssa_only_virtuals, + /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Remove empty loops. */ + +static unsigned int +tree_ssa_empty_loop (void) +{ + if (!current_loops) + return 0; + + return remove_empty_loops (current_loops); +} + +struct tree_opt_pass pass_empty_loop = +{ + "empty", /* name */ + NULL, /* gate */ + tree_ssa_empty_loop, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_COMPLETE_UNROLL, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Record bounds on numbers of iterations of loops. */ + +static unsigned int +tree_ssa_loop_bounds (void) +{ + if (!current_loops) + return 0; + + estimate_numbers_of_iterations (current_loops); + scev_reset (); + return 0; +} + +struct tree_opt_pass pass_record_bounds = +{ + NULL, /* name */ + NULL, /* gate */ + tree_ssa_loop_bounds, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP_BOUNDS, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + 0, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Complete unrolling of loops. */ + +static unsigned int +tree_complete_unroll (void) +{ + if (!current_loops) + return 0; + + return tree_unroll_loops_completely (current_loops, + flag_unroll_loops + || flag_peel_loops + || optimize >= 3); +} + +static bool +gate_tree_complete_unroll (void) +{ + return true; +} + +struct tree_opt_pass pass_complete_unroll = +{ + "cunroll", /* name */ + gate_tree_complete_unroll, /* gate */ + tree_complete_unroll, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_COMPLETE_UNROLL, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Prefetching. */ + +static unsigned int +tree_ssa_loop_prefetch (void) +{ + if (!current_loops) + return 0; + + return tree_ssa_prefetch_arrays (current_loops); +} + +static bool +gate_tree_ssa_loop_prefetch (void) +{ + return flag_prefetch_loop_arrays != 0; +} + +struct tree_opt_pass pass_loop_prefetch = +{ + "prefetch", /* name */ + gate_tree_ssa_loop_prefetch, /* gate */ + tree_ssa_loop_prefetch, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_PREFETCH, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Induction variable optimizations. */ + +static unsigned int +tree_ssa_loop_ivopts (void) +{ + if (!current_loops) + return 0; + + tree_ssa_iv_optimize (current_loops); + return 0; +} + +static bool +gate_tree_ssa_loop_ivopts (void) +{ + return flag_ivopts != 0; +} + +struct tree_opt_pass pass_iv_optimize = +{ + "ivopts", /* name */ + gate_tree_ssa_loop_ivopts, /* gate */ + tree_ssa_loop_ivopts, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP_IVOPTS, /* tv_id */ + PROP_cfg | PROP_ssa, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func + | TODO_verify_loops + | TODO_update_ssa, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* Loop optimizer finalization. */ + +static unsigned int +tree_ssa_loop_done (void) +{ + if (!current_loops) + return 0; + + free_numbers_of_iterations_estimates (current_loops); + scev_finalize (); + loop_optimizer_finalize (current_loops); + current_loops = NULL; + return 0; +} + +struct tree_opt_pass pass_tree_loop_done = +{ + "loopdone", /* name */ + NULL, /* gate */ + tree_ssa_loop_done, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_TREE_LOOP_FINI, /* tv_id */ + PROP_cfg, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_cleanup_cfg | TODO_dump_func, /* todo_flags_finish */ + 0 /* letter */ +}; |