/* Instruction scheduling pass.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com) Enhanced by,
and currently maintained by, Jim Wilson (wilson@cygnus.com)
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
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. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
\f
#include "config.h"
#include "system.h"
#include "sched-int.h"
#include "target.h"
#include "output.h"
+
\f
+#ifdef INSN_SCHEDULING
+
/* The number of insns scheduled so far. */
static int sched_n_insns;
/* Set of blocks, that already have their dependencies calculated. */
static bitmap_head dont_calc_deps;
-/* Set of basic blocks, that are ebb heads of tails respectively. */
-static bitmap_head ebb_head, ebb_tail;
/* Last basic block in current ebb. */
static basic_block last_bb;
static basic_block advance_target_bb (basic_block, rtx);
static void fix_recovery_cfg (int, int, int);
-#ifdef ENABLE_CHECKING
-static int ebb_head_or_leaf_p (basic_block, int);
-#endif
-
/* Return nonzero if there are more insns that should be scheduled. */
static int
return sched_n_insns < n_insns;
}
+/* Print dependency information about ebb between HEAD and TAIL. */
+static void
+debug_ebb_dependencies (rtx head, rtx tail)
+{
+ fprintf (sched_dump,
+ ";; --------------- forward dependences: ------------ \n");
+
+ fprintf (sched_dump, "\n;; --- EBB Dependences --- from bb%d to bb%d \n",
+ BLOCK_NUM (head), BLOCK_NUM (tail));
+
+ debug_dependencies (head, tail);
+}
+
/* Add all insns that are initially ready to the ready list READY. Called
once before scheduling a set of insns. */
sched_n_insns = 0;
-#if 0
/* Print debugging information. */
if (sched_verbose >= 5)
- debug_dependencies ();
-#endif
+ debug_ebb_dependencies (NEXT_INSN (prev_head), PREV_INSN (next_tail));
/* Initialize ready list with all 'ready' insns in target block.
Count number of insns in the target block being scheduled. */
it may guard the fallthrough block from using a value that has
conditionally overwritten that of the main codepath. So we
consider that it restores the value of the main codepath. */
- bitmap_and (set, glat_start [e->dest->index], cond_set);
+ bitmap_and (set, df_get_live_in (e->dest), cond_set);
else
- bitmap_ior_into (used, glat_start [e->dest->index]);
+ bitmap_ior_into (used, df_get_live_in (e->dest));
}
/* Used in schedule_insns to initialize current_sched_info for scheduling
add_block1,
advance_target_bb,
fix_recovery_cfg,
-#ifdef ENABLE_CHECKING
- ebb_head_or_leaf_p,
-#endif
- /* We need to DETACH_LIVE_INFO to be able to create new basic blocks.
- See begin_schedule_ready (). */
- SCHED_EBB | USE_GLAT | DETACH_LIFE_INFO
+ SCHED_EBB
+ /* We can create new blocks in begin_schedule_ready (). */
+ | NEW_BBS
};
\f
/* Returns the earliest block in EBB currently being processed where a
static basic_block
earliest_block_with_similiar_load (basic_block last_block, rtx load_insn)
{
- rtx back_link;
+ sd_iterator_def back_sd_it;
+ dep_t back_dep;
basic_block bb, earliest_block = NULL;
- for (back_link = LOG_LINKS (load_insn);
- back_link;
- back_link = XEXP (back_link, 1))
+ FOR_EACH_DEP (load_insn, SD_LIST_BACK, back_sd_it, back_dep)
{
- rtx insn1 = XEXP (back_link, 0);
+ rtx insn1 = DEP_PRO (back_dep);
- if (GET_MODE (back_link) == VOIDmode)
+ if (DEP_TYPE (back_dep) == REG_DEP_TRUE)
+ /* Found a DEF-USE dependence (insn1, load_insn). */
{
- /* Found a DEF-USE dependence (insn1, load_insn). */
- rtx fore_link;
+ sd_iterator_def fore_sd_it;
+ dep_t fore_dep;
- for (fore_link = INSN_DEPEND (insn1);
- fore_link;
- fore_link = XEXP (fore_link, 1))
+ FOR_EACH_DEP (insn1, SD_LIST_FORW, fore_sd_it, fore_dep)
{
- rtx insn2 = XEXP (fore_link, 0);
+ rtx insn2 = DEP_CON (fore_dep);
basic_block insn2_block = BLOCK_FOR_INSN (insn2);
- if (GET_MODE (fore_link) == VOIDmode)
+ if (DEP_TYPE (fore_dep) == REG_DEP_TRUE)
{
if (earliest_block != NULL
&& earliest_block->index < insn2_block->index)
rank. */
if (! sched_insns_conditions_mutex_p (insn, prev))
{
- if (!(current_sched_info->flags & DO_SPECULATION))
+ dep_def _dep, *dep = &_dep;
+
+ init_dep (dep, prev, insn, REG_DEP_ANTI);
+
+ if (!(current_sched_info->flags & USE_DEPS_LIST))
{
enum DEPS_ADJUST_RESULT res;
-
- res = add_or_update_back_dep (insn, prev,
- REG_DEP_ANTI, DEP_ANTI);
-
- if (res == DEP_CREATED)
- add_forw_dep (insn, LOG_LINKS (insn));
- else
- gcc_assert (res != DEP_CHANGED);
+
+ res = sd_add_or_update_dep (dep, false);
+
+ /* We can't change an existing dependency with
+ DEP_ANTI. */
+ gcc_assert (res != DEP_CHANGED);
}
else
- add_or_update_back_forw_dep (insn, prev, REG_DEP_ANTI,
- set_dep_weak (DEP_ANTI,
- BEGIN_CONTROL,
- MAX_DEP_WEAK));
+ {
+ if ((current_sched_info->flags & DO_SPECULATION)
+ && (spec_info->mask & BEGIN_CONTROL))
+ DEP_STATUS (dep) = set_dep_weak (DEP_ANTI, BEGIN_CONTROL,
+ MAX_DEP_WEAK);
+
+ sd_add_or_update_dep (dep, false);
+
+ /* Dep_status could have been changed.
+ No assertion here. */
+ }
}
break;
{
init_deps_global ();
- /* Compute LOG_LINKS. */
+ /* Compute dependencies. */
init_deps (&tmp_deps);
sched_analyze (&tmp_deps, head, tail);
free_deps (&tmp_deps);
- /* Compute INSN_DEPEND. */
- compute_forward_dependences (head, tail);
-
add_deps_for_risky_insns (head, tail);
if (targetm.sched.dependencies_evaluation_hook)
current_sched_info->prev_head = PREV_INSN (head);
current_sched_info->next_tail = NEXT_INSN (tail);
- if (write_symbols != NO_DEBUG)
- {
- save_line_notes (first_bb->index, head, tail);
- }
-
/* rm_other_notes only removes notes which are _inside_ the
block---that is, it won't remove notes before the first real insn
or after the last real insn of the block. So if the first insn
/* Sanity check: verify that all region insns were scheduled. */
gcc_assert (sched_n_insns == n_insns);
- head = current_sched_info->head;
- tail = current_sched_info->tail;
- if (write_symbols != NO_DEBUG)
- restore_line_notes (head, tail);
+ /* Free dependencies. */
+ sched_free_deps (current_sched_info->head, current_sched_info->tail, true);
+
+ gcc_assert (haifa_recovery_bb_ever_added_p
+ || deps_pools_are_empty_p ());
if (EDGE_COUNT (last_bb->preds) == 0)
/* LAST_BB is unreachable. */
basic_block bb;
int probability_cutoff;
rtx tail;
- sbitmap large_region_blocks, blocks;
- int any_large_regions;
if (profile_info && flag_branch_probabilities)
probability_cutoff = PARAM_VALUE (TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK);
invoked via sched_init. */
current_sched_info = &ebb_sched_info;
+ df_set_flags (DF_LR_RUN_DCE);
+ df_note_add_problem ();
+ df_analyze ();
+ df_clear_flags (DF_LR_RUN_DCE);
+ regstat_compute_calls_crossed ();
sched_init ();
compute_bb_for_insn ();
/* Initialize DONT_CALC_DEPS and ebb-{start, end} markers. */
bitmap_initialize (&dont_calc_deps, 0);
bitmap_clear (&dont_calc_deps);
- bitmap_initialize (&ebb_head, 0);
- bitmap_clear (&ebb_head);
- bitmap_initialize (&ebb_tail, 0);
- bitmap_clear (&ebb_tail);
/* Schedule every region in the subroutine. */
FOR_EACH_BB (bb)
break;
}
- bitmap_set_bit (&ebb_head, BLOCK_NUM (head));
bb = schedule_ebb (head, tail);
- bitmap_set_bit (&ebb_tail, bb->index);
}
bitmap_clear (&dont_calc_deps);
- gcc_assert (current_sched_info->flags & DETACH_LIFE_INFO);
- /* We can create new basic blocks during scheduling, and
- attach_life_info () will create regsets for them
- (along with attaching existing info back). */
- attach_life_info ();
-
- /* Updating register live information. */
- allocate_reg_life_data ();
-
- any_large_regions = 0;
- large_region_blocks = sbitmap_alloc (last_basic_block);
- sbitmap_zero (large_region_blocks);
- FOR_EACH_BB (bb)
- SET_BIT (large_region_blocks, bb->index);
-
- blocks = sbitmap_alloc (last_basic_block);
- sbitmap_zero (blocks);
-
- /* Update life information. For regions consisting of multiple blocks
- we've possibly done interblock scheduling that affects global liveness.
- For regions consisting of single blocks we need to do only local
- liveness. */
- FOR_EACH_BB (bb)
- {
- int bbi;
-
- bbi = bb->index;
-
- if (!bitmap_bit_p (&ebb_head, bbi)
- || !bitmap_bit_p (&ebb_tail, bbi)
- /* New blocks (e.g. recovery blocks) should be processed
- as parts of large regions. */
- || !glat_start[bbi])
- any_large_regions = 1;
- else
- {
- SET_BIT (blocks, bbi);
- RESET_BIT (large_region_blocks, bbi);
- }
- }
-
- update_life_info (blocks, UPDATE_LIFE_LOCAL, 0);
- sbitmap_free (blocks);
-
- if (any_large_regions)
- {
- update_life_info (large_region_blocks, UPDATE_LIFE_GLOBAL, 0);
-
-#ifdef ENABLE_CHECKING
- /* !!! We can't check reg_live_info here because of the fact,
- that destination registers of COND_EXEC's may be dead
- before scheduling (while they should be alive). Don't know why. */
- /*check_reg_live (true);*/
-#endif
- }
- sbitmap_free (large_region_blocks);
-
- bitmap_clear (&ebb_head);
- bitmap_clear (&ebb_tail);
-
/* Reposition the prologue and epilogue notes in case we moved the
prologue/epilogue insns. */
if (reload_completed)
- reposition_prologue_and_epilogue_notes (get_insns ());
+ reposition_prologue_and_epilogue_notes ();
sched_finish ();
+ regstat_free_calls_crossed ();
}
/* INSN has been added to/removed from current ebb. */
last_bb = BASIC_BLOCK (jump_bbi);
}
-#ifdef ENABLE_CHECKING
-/* Return non zero, if BB is first or last (depending of LEAF_P) block in
- current ebb. For more information please refer to
- sched-int.h: struct sched_info: region_head_or_leaf_p. */
-static int
-ebb_head_or_leaf_p (basic_block bb, int leaf_p)
-{
- if (!leaf_p)
- return bitmap_bit_p (&ebb_head, bb->index);
- else
- return bitmap_bit_p (&ebb_tail, bb->index);
-}
-#endif /* ENABLE_CHECKING */
+#endif /* INSN_SCHEDULING */
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