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/* Loop optimizations over tree-ssa.
Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010
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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "tm_p.h"
#include "basic-block.h"
#include "tree-flow.h"
#include "tree-pass.h"
#include "cfgloop.h"
#include "flags.h"
#include "tree-inline.h"
#include "tree-scalar-evolution.h"
#include "diagnostic-core.h"
#include "tree-vectorizer.h"
/* The loop superpass. */
static bool
gate_tree_loop (void)
{
return flag_tree_loop_optimize != 0;
}
struct gimple_opt_pass pass_tree_loop =
{
{
GIMPLE_PASS,
"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_verify_ssa | TODO_ggc_collect /* todo_flags_finish */
}
};
/* Loop optimizer initialization. */
static unsigned int
tree_ssa_loop_init (void)
{
loop_optimizer_init (LOOPS_NORMAL
| LOOPS_HAVE_RECORDED_EXITS);
rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa);
if (number_of_loops () <= 1)
return 0;
scev_initialize ();
return 0;
}
struct gimple_opt_pass pass_tree_loop_init =
{
{
GIMPLE_PASS,
"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 */
PROP_loops, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
/* Loop invariant motion pass. */
static unsigned int
tree_ssa_loop_im (void)
{
if (number_of_loops () <= 1)
return 0;
return tree_ssa_lim ();
}
static bool
gate_tree_ssa_loop_im (void)
{
return flag_tree_loop_im != 0;
}
struct gimple_opt_pass pass_lim =
{
{
GIMPLE_PASS,
"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 */
0 /* todo_flags_finish */
}
};
/* Loop unswitching pass. */
static unsigned int
tree_ssa_loop_unswitch (void)
{
if (number_of_loops () <= 1)
return 0;
return tree_ssa_unswitch_loops ();
}
static bool
gate_tree_ssa_loop_unswitch (void)
{
return flag_unswitch_loops != 0;
}
struct gimple_opt_pass pass_tree_unswitch =
{
{
GIMPLE_PASS,
"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_ggc_collect /* todo_flags_finish */
}
};
/* Predictive commoning. */
static unsigned
run_tree_predictive_commoning (void)
{
if (!current_loops)
return 0;
return tree_predictive_commoning ();
}
static bool
gate_tree_predictive_commoning (void)
{
return flag_predictive_commoning != 0;
}
struct gimple_opt_pass pass_predcom =
{
{
GIMPLE_PASS,
"pcom", /* name */
gate_tree_predictive_commoning, /* gate */
run_tree_predictive_commoning, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_PREDCOM, /* tv_id */
PROP_cfg, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_update_ssa_only_virtuals /* todo_flags_finish */
}
};
/* Loop autovectorization. */
static unsigned int
tree_vectorize (void)
{
if (number_of_loops () <= 1)
return 0;
return vectorize_loops ();
}
static bool
gate_tree_vectorize (void)
{
return flag_tree_vectorize;
}
struct gimple_opt_pass pass_vectorize =
{
{
GIMPLE_PASS,
"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 */
0, /* todo_flags_start */
TODO_update_ssa
| TODO_ggc_collect /* todo_flags_finish */
}
};
/* GRAPHITE optimizations. */
static unsigned int
graphite_transforms (void)
{
if (!current_loops)
return 0;
graphite_transform_loops ();
return 0;
}
static bool
gate_graphite_transforms (void)
{
/* Enable -fgraphite pass if any one of the graphite optimization flags
is turned on. */
if (flag_loop_block
|| flag_loop_interchange
|| flag_loop_strip_mine
|| flag_graphite_identity
|| flag_loop_parallelize_all
|| flag_loop_optimize_isl)
flag_graphite = 1;
return flag_graphite != 0;
}
struct gimple_opt_pass pass_graphite =
{
{
GIMPLE_PASS,
"graphite0", /* name */
gate_graphite_transforms, /* gate */
NULL, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_GRAPHITE, /* tv_id */
PROP_cfg | PROP_ssa, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
struct gimple_opt_pass pass_graphite_transforms =
{
{
GIMPLE_PASS,
"graphite", /* name */
gate_graphite_transforms, /* gate */
graphite_transforms, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_GRAPHITE_TRANSFORMS, /* tv_id */
PROP_cfg | PROP_ssa, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
/* Check the correctness of the data dependence analyzers. */
static unsigned int
check_data_deps (void)
{
if (number_of_loops () <= 1)
return 0;
tree_check_data_deps ();
return 0;
}
static bool
gate_check_data_deps (void)
{
return flag_check_data_deps != 0;
}
struct gimple_opt_pass pass_check_data_deps =
{
{
GIMPLE_PASS,
"ckdd", /* name */
gate_check_data_deps, /* gate */
check_data_deps, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_CHECK_DATA_DEPS, /* tv_id */
PROP_cfg | PROP_ssa, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
/* Canonical induction variable creation pass. */
static unsigned int
tree_ssa_loop_ivcanon (void)
{
if (number_of_loops () <= 1)
return 0;
return canonicalize_induction_variables ();
}
static bool
gate_tree_ssa_loop_ivcanon (void)
{
return flag_tree_loop_ivcanon != 0;
}
struct gimple_opt_pass pass_iv_canon =
{
{
GIMPLE_PASS,
"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 */
0 /* todo_flags_finish */
}
};
/* Propagation of constants using scev. */
static bool
gate_scev_const_prop (void)
{
return flag_tree_scev_cprop;
}
struct gimple_opt_pass pass_scev_cprop =
{
{
GIMPLE_PASS,
"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_cleanup_cfg
| TODO_update_ssa_only_virtuals
/* todo_flags_finish */
}
};
/* Record bounds on numbers of iterations of loops. */
static unsigned int
tree_ssa_loop_bounds (void)
{
if (number_of_loops () <= 1)
return 0;
estimate_numbers_of_iterations ();
scev_reset ();
return 0;
}
struct gimple_opt_pass pass_record_bounds =
{
{
GIMPLE_PASS,
"*record_bounds", /* 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 */
}
};
/* Complete unrolling of loops. */
static unsigned int
tree_complete_unroll (void)
{
if (number_of_loops () <= 1)
return 0;
return tree_unroll_loops_completely (flag_unroll_loops
|| flag_peel_loops
|| optimize >= 3, true);
}
static bool
gate_tree_complete_unroll (void)
{
return true;
}
struct gimple_opt_pass pass_complete_unroll =
{
{
GIMPLE_PASS,
"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_ggc_collect /* todo_flags_finish */
}
};
/* Complete unrolling of inner loops. */
static unsigned int
tree_complete_unroll_inner (void)
{
unsigned ret = 0;
loop_optimizer_init (LOOPS_NORMAL
| LOOPS_HAVE_RECORDED_EXITS);
if (number_of_loops () > 1)
{
scev_initialize ();
ret = tree_unroll_loops_completely (optimize >= 3, false);
free_numbers_of_iterations_estimates ();
scev_finalize ();
}
loop_optimizer_finalize ();
return ret;
}
static bool
gate_tree_complete_unroll_inner (void)
{
return optimize >= 2;
}
struct gimple_opt_pass pass_complete_unrolli =
{
{
GIMPLE_PASS,
"cunrolli", /* name */
gate_tree_complete_unroll_inner, /* gate */
tree_complete_unroll_inner, /* 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_verify_flow
| TODO_ggc_collect /* todo_flags_finish */
}
};
/* Parallelization. */
static bool
gate_tree_parallelize_loops (void)
{
return flag_tree_parallelize_loops > 1;
}
static unsigned
tree_parallelize_loops (void)
{
if (number_of_loops () <= 1)
return 0;
if (parallelize_loops ())
return TODO_cleanup_cfg | TODO_rebuild_alias;
return 0;
}
struct gimple_opt_pass pass_parallelize_loops =
{
{
GIMPLE_PASS,
"parloops", /* name */
gate_tree_parallelize_loops, /* gate */
tree_parallelize_loops, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_TREE_PARALLELIZE_LOOPS, /* tv_id */
PROP_cfg | PROP_ssa, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
/* Prefetching. */
static unsigned int
tree_ssa_loop_prefetch (void)
{
if (number_of_loops () <= 1)
return 0;
return tree_ssa_prefetch_arrays ();
}
static bool
gate_tree_ssa_loop_prefetch (void)
{
return flag_prefetch_loop_arrays > 0;
}
struct gimple_opt_pass pass_loop_prefetch =
{
{
GIMPLE_PASS,
"aprefetch", /* 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 */
0 /* todo_flags_finish */
}
};
/* Induction variable optimizations. */
static unsigned int
tree_ssa_loop_ivopts (void)
{
if (number_of_loops () <= 1)
return 0;
tree_ssa_iv_optimize ();
return 0;
}
static bool
gate_tree_ssa_loop_ivopts (void)
{
return flag_ivopts != 0;
}
struct gimple_opt_pass pass_iv_optimize =
{
{
GIMPLE_PASS,
"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_update_ssa | TODO_ggc_collect /* todo_flags_finish */
}
};
/* Loop optimizer finalization. */
static unsigned int
tree_ssa_loop_done (void)
{
free_numbers_of_iterations_estimates ();
scev_finalize ();
loop_optimizer_finalize ();
return 0;
}
struct gimple_opt_pass pass_tree_loop_done =
{
{
GIMPLE_PASS,
"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_verify_flow /* todo_flags_finish */
}
};
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