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512 lines
12 KiB
C
512 lines
12 KiB
C
/* Loop optimizations over tree-ssa.
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Copyright (C) 2003, 2005 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "rtl.h"
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#include "tm_p.h"
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#include "hard-reg-set.h"
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#include "basic-block.h"
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#include "output.h"
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#include "diagnostic.h"
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#include "tree-flow.h"
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#include "tree-dump.h"
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#include "tree-pass.h"
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#include "timevar.h"
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#include "cfgloop.h"
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#include "flags.h"
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#include "tree-inline.h"
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#include "tree-scalar-evolution.h"
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/* The loop tree currently optimized. */
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struct loops *current_loops = NULL;
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/* Initializes the loop structures. */
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static struct loops *
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tree_loop_optimizer_init (void)
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{
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struct loops *loops;
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loops = loop_optimizer_init (LOOPS_NORMAL
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| LOOPS_HAVE_MARKED_SINGLE_EXITS);
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if (!loops)
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return NULL;
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rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa);
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return loops;
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}
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/* The loop superpass. */
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static bool
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gate_tree_loop (void)
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{
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return flag_tree_loop_optimize != 0;
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}
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struct tree_opt_pass pass_tree_loop =
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{
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"loop", /* name */
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gate_tree_loop, /* gate */
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NULL, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP, /* tv_id */
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PROP_cfg, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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TODO_ggc_collect, /* todo_flags_start */
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TODO_dump_func | TODO_verify_ssa | TODO_ggc_collect, /* todo_flags_finish */
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0 /* letter */
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};
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/* Loop optimizer initialization. */
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static unsigned int
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tree_ssa_loop_init (void)
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{
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current_loops = tree_loop_optimizer_init ();
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if (!current_loops)
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return 0;
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scev_initialize (current_loops);
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return 0;
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}
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struct tree_opt_pass pass_tree_loop_init =
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{
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"loopinit", /* name */
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NULL, /* gate */
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tree_ssa_loop_init, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP_INIT, /* tv_id */
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PROP_cfg, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Loop invariant motion pass. */
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static unsigned int
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tree_ssa_loop_im (void)
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{
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if (!current_loops)
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return 0;
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tree_ssa_lim (current_loops);
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return 0;
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}
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static bool
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gate_tree_ssa_loop_im (void)
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{
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return flag_tree_loop_im != 0;
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}
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struct tree_opt_pass pass_lim =
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{
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"lim", /* name */
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gate_tree_ssa_loop_im, /* gate */
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tree_ssa_loop_im, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_LIM, /* tv_id */
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PROP_cfg, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Loop unswitching pass. */
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static unsigned int
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tree_ssa_loop_unswitch (void)
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{
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if (!current_loops)
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return 0;
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return tree_ssa_unswitch_loops (current_loops);
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}
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static bool
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gate_tree_ssa_loop_unswitch (void)
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{
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return flag_unswitch_loops != 0;
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}
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struct tree_opt_pass pass_tree_unswitch =
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{
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"unswitch", /* name */
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gate_tree_ssa_loop_unswitch, /* gate */
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tree_ssa_loop_unswitch, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP_UNSWITCH, /* tv_id */
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PROP_cfg, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Loop autovectorization. */
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static unsigned int
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tree_vectorize (void)
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{
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vectorize_loops (current_loops);
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return 0;
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}
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static bool
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gate_tree_vectorize (void)
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{
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return flag_tree_vectorize && current_loops;
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}
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struct tree_opt_pass pass_vectorize =
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{
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"vect", /* name */
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gate_tree_vectorize, /* gate */
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tree_vectorize, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_VECTORIZATION, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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TODO_verify_loops, /* todo_flags_start */
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TODO_dump_func | TODO_update_ssa, /* todo_flags_finish */
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0 /* letter */
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};
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/* Loop nest optimizations. */
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static unsigned int
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tree_linear_transform (void)
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{
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if (!current_loops)
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return 0;
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linear_transform_loops (current_loops);
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return 0;
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}
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static bool
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gate_tree_linear_transform (void)
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{
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return flag_tree_loop_linear != 0;
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}
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struct tree_opt_pass pass_linear_transform =
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{
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"ltrans", /* name */
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gate_tree_linear_transform, /* gate */
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tree_linear_transform, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LINEAR_TRANSFORM, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Canonical induction variable creation pass. */
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static unsigned int
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tree_ssa_loop_ivcanon (void)
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{
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if (!current_loops)
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return 0;
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return canonicalize_induction_variables (current_loops);
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}
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static bool
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gate_tree_ssa_loop_ivcanon (void)
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{
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return flag_tree_loop_ivcanon != 0;
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}
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struct tree_opt_pass pass_iv_canon =
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{
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"ivcanon", /* name */
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gate_tree_ssa_loop_ivcanon, /* gate */
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tree_ssa_loop_ivcanon, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP_IVCANON, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Propagation of constants using scev. */
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static bool
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gate_scev_const_prop (void)
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{
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return true;
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}
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struct tree_opt_pass pass_scev_cprop =
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{
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"sccp", /* name */
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gate_scev_const_prop, /* gate */
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scev_const_prop, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_SCEV_CONST, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_cleanup_cfg
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| TODO_update_ssa_only_virtuals,
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/* todo_flags_finish */
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0 /* letter */
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};
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/* Remove empty loops. */
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static unsigned int
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tree_ssa_empty_loop (void)
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{
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if (!current_loops)
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return 0;
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return remove_empty_loops (current_loops);
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}
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struct tree_opt_pass pass_empty_loop =
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{
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"empty", /* name */
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NULL, /* gate */
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tree_ssa_empty_loop, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_COMPLETE_UNROLL, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Record bounds on numbers of iterations of loops. */
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static unsigned int
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tree_ssa_loop_bounds (void)
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{
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if (!current_loops)
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return 0;
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estimate_numbers_of_iterations (current_loops);
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scev_reset ();
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return 0;
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}
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struct tree_opt_pass pass_record_bounds =
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{
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NULL, /* name */
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NULL, /* gate */
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tree_ssa_loop_bounds, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP_BOUNDS, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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0, /* todo_flags_finish */
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0 /* letter */
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};
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/* Complete unrolling of loops. */
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static unsigned int
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tree_complete_unroll (void)
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{
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if (!current_loops)
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return 0;
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return tree_unroll_loops_completely (current_loops,
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flag_unroll_loops
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|| flag_peel_loops
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|| optimize >= 3);
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}
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static bool
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gate_tree_complete_unroll (void)
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{
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return true;
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}
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struct tree_opt_pass pass_complete_unroll =
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{
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"cunroll", /* name */
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gate_tree_complete_unroll, /* gate */
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tree_complete_unroll, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_COMPLETE_UNROLL, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Prefetching. */
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static unsigned int
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tree_ssa_loop_prefetch (void)
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{
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if (!current_loops)
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return 0;
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return tree_ssa_prefetch_arrays (current_loops);
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}
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static bool
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gate_tree_ssa_loop_prefetch (void)
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{
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return flag_prefetch_loop_arrays != 0;
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}
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struct tree_opt_pass pass_loop_prefetch =
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{
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"prefetch", /* name */
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gate_tree_ssa_loop_prefetch, /* gate */
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tree_ssa_loop_prefetch, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_PREFETCH, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
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0 /* letter */
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};
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/* Induction variable optimizations. */
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static unsigned int
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tree_ssa_loop_ivopts (void)
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{
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if (!current_loops)
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return 0;
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tree_ssa_iv_optimize (current_loops);
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return 0;
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}
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static bool
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gate_tree_ssa_loop_ivopts (void)
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{
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return flag_ivopts != 0;
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}
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struct tree_opt_pass pass_iv_optimize =
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{
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"ivopts", /* name */
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gate_tree_ssa_loop_ivopts, /* gate */
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tree_ssa_loop_ivopts, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP_IVOPTS, /* tv_id */
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PROP_cfg | PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_dump_func
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| TODO_verify_loops
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| TODO_update_ssa, /* todo_flags_finish */
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0 /* letter */
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};
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/* Loop optimizer finalization. */
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static unsigned int
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tree_ssa_loop_done (void)
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{
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if (!current_loops)
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return 0;
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free_numbers_of_iterations_estimates (current_loops);
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scev_finalize ();
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loop_optimizer_finalize (current_loops);
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current_loops = NULL;
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return 0;
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}
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struct tree_opt_pass pass_tree_loop_done =
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{
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"loopdone", /* name */
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NULL, /* gate */
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tree_ssa_loop_done, /* execute */
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NULL, /* sub */
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NULL, /* next */
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0, /* static_pass_number */
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TV_TREE_LOOP_FINI, /* tv_id */
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PROP_cfg, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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TODO_cleanup_cfg | TODO_dump_func, /* todo_flags_finish */
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0 /* letter */
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};
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