/* Loop optimizer initialization routines and RTL loop optimization passes.
- Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GCC.
#include "tree-pass.h"
#include "timevar.h"
#include "flags.h"
+#include "df.h"
+#include "ggc.h"
\f
-/* Initialize loop optimizer. This is used by the tree and RTL loop
+/* 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 *
+void
loop_optimizer_init (unsigned flags)
{
- struct loops *loops = XCNEW (struct loops);
- edge e;
- edge_iterator ei;
- static bool first_time = true;
-
- if (first_time)
- {
- first_time = false;
- init_set_costs ();
- }
+ struct loops *loops;
- /* Avoid annoying special cases of edges going to exit
- block. */
-
- for (ei = ei_start (EXIT_BLOCK_PTR->preds); (e = ei_safe_edge (ei)); )
- if ((e->flags & EDGE_FALLTHRU) && !single_succ_p (e->src))
- split_edge (e);
- else
- ei_next (&ei);
+ gcc_assert (!current_loops);
+ loops = GGC_CNEW (struct loops);
/* Find the loops. */
- if (flow_loops_find (loops) <= 1)
- {
- /* No loops. */
- flow_loops_free (loops);
- 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);
+ current_loops->state = 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. */
if (flags & LOOPS_HAVE_PREHEADERS)
- create_preheaders (loops, CP_SIMPLE_PREHEADERS);
+ create_preheaders (CP_SIMPLE_PREHEADERS);
/* Force all latches to have only single successor. */
if (flags & LOOPS_HAVE_SIMPLE_LATCHES)
- force_single_succ_latches (loops);
+ force_single_succ_latches ();
/* Mark irreducible loops. */
if (flags & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
- mark_irreducible_loops (loops);
+ mark_irreducible_loops ();
- if (flags & LOOPS_HAVE_MARKED_SINGLE_EXITS)
- mark_single_exit_loops (loops);
+ if (flags & LOOPS_HAVE_RECORDED_EXITS)
+ record_loop_exits ();
/* Dump loops. */
- flow_loops_dump (loops, dump_file, 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)
+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]);
+ FOR_EACH_LOOP (li, loop, 0)
+ {
+ free_simple_loop_desc (loop);
+ }
/* Clean up. */
- flow_loops_free (loops);
- free (loops);
+ if (current_loops->state & 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
\f
/* Initialization of the RTL loop passes. */
-static void
+static unsigned int
rtl_loop_init (void)
{
+ gcc_assert (current_ir_type () == IR_RTL_CFGLAYOUT);
+
if (dump_file)
- dump_flow_info (dump_file);
-
- /* Initialize structures for layout changes. */
- cfg_layout_initialize (0);
+ dump_flow_info (dump_file, dump_flags);
- current_loops = loop_optimizer_init (LOOPS_NORMAL);
+ loop_optimizer_init (LOOPS_NORMAL);
+ return 0;
}
struct tree_opt_pass pass_rtl_loop_init =
\f
/* Finalization of the RTL loop passes. */
-static void
+
+static unsigned int
rtl_loop_done (void)
{
- basic_block bb;
-
- if (current_loops)
- loop_optimizer_finalize (current_loops);
-
+ loop_optimizer_finalize ();
free_dominance_info (CDI_DOMINATORS);
- /* Finalize layout changes. */
- FOR_EACH_BB (bb)
- if (bb->next_bb != EXIT_BLOCK_PTR)
- bb->aux = bb->next_bb;
- cfg_layout_finalize ();
-
- cleanup_cfg (CLEANUP_EXPENSIVE);
- delete_trivially_dead_insns (get_insns (), max_reg_num ());
- reg_scan (get_insns (), max_reg_num ());
+ cleanup_cfg (0);
if (dump_file)
- dump_flow_info (dump_file);
+ dump_flow_info (dump_file, dump_flags);
- current_loops = NULL;
+ return 0;
}
struct tree_opt_pass pass_rtl_loop_done =
return flag_move_loop_invariants;
}
-static void
+static unsigned int
rtl_move_loop_invariants (void)
{
- if (current_loops)
- move_loop_invariants (current_loops);
+ if (number_of_loops () > 1)
+ move_loop_invariants ();
+ return 0;
}
struct tree_opt_pass pass_rtl_move_loop_invariants =
{
- "loop2_invariant", /* name */
+ "loop2_invariant", /* name */
gate_rtl_move_loop_invariants, /* gate */
rtl_move_loop_invariants, /* execute */
NULL, /* sub */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
- 0, /* todo_flags_start */
+ 0, /* todo_flags_start */
+ TODO_df_finish | /* This is shutting down the instance in loop_invariant.c */
TODO_dump_func, /* todo_flags_finish */
'L' /* letter */
};
return flag_unswitch_loops;
}
-static void
+static unsigned int
rtl_unswitch (void)
{
- if (current_loops)
- unswitch_loops (current_loops);
+ if (number_of_loops () > 1)
+ unswitch_loops ();
+ return 0;
}
struct tree_opt_pass pass_rtl_unswitch =
return (flag_peel_loops || flag_unroll_loops || flag_unroll_all_loops);
}
-static void
+static unsigned int
rtl_unroll_and_peel_loops (void)
{
- if (current_loops)
+ 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_all_loops)
flags |= UAP_UNROLL_ALL;
- unroll_and_peel_loops (current_loops, flags);
+ unroll_and_peel_loops (flags);
}
+ return 0;
}
struct tree_opt_pass pass_rtl_unroll_and_peel_loops =
#endif
}
-static void
+static unsigned int
rtl_doloop (void)
{
#ifdef HAVE_doloop_end
- if (current_loops)
- doloop_optimize_loops (current_loops);
+ if (number_of_loops () > 1)
+ doloop_optimize_loops ();
#endif
+ return 0;
}
struct tree_opt_pass pass_rtl_doloop =
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