/* Perform branch target register load optimizations.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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
+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/>. */
#include "config.h"
#include "system.h"
#include "tm_p.h"
#include "toplev.h"
#include "tree-pass.h"
+#include "recog.h"
+#include "df.h"
/* Target register optimizations - these are performed after reload. */
static int issue_rate;
-static int basic_block_freq (basic_block);
-static int insn_sets_btr_p (rtx, int, int *);
+static int basic_block_freq (const_basic_block);
+static int insn_sets_btr_p (const_rtx, int, int *);
static rtx *find_btr_use (rtx);
static int btr_referenced_p (rtx, rtx *);
static int find_btr_reference (rtx *, void *);
static void move_btr_def (basic_block, int, btr_def, bitmap, HARD_REG_SET *);
static int migrate_btr_def (btr_def, int);
static void migrate_btr_defs (enum reg_class, int);
-static int can_move_up (basic_block, rtx, int);
-static void note_btr_set (rtx, rtx, void *);
+static int can_move_up (const_basic_block, const_rtx, int);
+static void note_btr_set (rtx, const_rtx, void *);
\f
/* The following code performs code motion of target load instructions
(instructions that set branch target registers), to move them
/* Return an estimate of the frequency of execution of block bb. */
static int
-basic_block_freq (basic_block bb)
+basic_block_freq (const_basic_block bb)
{
return bb->frequency;
}
find_btr_reference (rtx *px, void *preg)
{
rtx x;
- int regno, i;
if (px == preg)
return -1;
x = *px;
if (!REG_P (x))
return 0;
- regno = REGNO (x);
- for (i = hard_regno_nregs[regno][GET_MODE (x)] - 1; i >= 0; i--)
- if (TEST_HARD_REG_BIT (all_btrs, regno+i))
- {
- btr_reference_found = px;
- return 1;
- }
+ if (overlaps_hard_reg_set_p (all_btrs, GET_MODE (x), REGNO (x)))
+ {
+ btr_reference_found = px;
+ return 1;
+ }
return -1;
}
If such a set is found and REGNO is nonzero, assign the register number
of the destination register to *REGNO. */
static int
-insn_sets_btr_p (rtx insn, int check_const, int *regno)
+insn_sets_btr_p (const_rtx insn, int check_const, int *regno)
{
rtx set;
&& TEST_HARD_REG_BIT (all_btrs, REGNO (dest)))
{
gcc_assert (!btr_referenced_p (src, NULL));
-
+
if (!check_const || CONSTANT_P (src))
{
if (regno)
straightforward definitions. DATA points to information about the
current basic block that needs updating. */
static void
-note_btr_set (rtx dest, rtx set ATTRIBUTE_UNUSED, void *data)
+note_btr_set (rtx dest, const_rtx set ATTRIBUTE_UNUSED, void *data)
{
defs_uses_info *info = data;
int regno, end_regno;
if (!REG_P (dest))
return;
regno = REGNO (dest);
- end_regno = regno + hard_regno_nregs[regno][GET_MODE (dest)];
+ end_regno = END_HARD_REGNO (dest);
for (; regno < end_regno; regno++)
if (TEST_HARD_REG_BIT (all_btrs, regno))
{
CLEAR_HARD_REG_SET (info.btrs_written_in_block);
for (reg = first_btr; reg <= last_btr; reg++)
if (TEST_HARD_REG_BIT (all_btrs, reg)
- && REGNO_REG_SET_P (bb->il.rtl->global_live_at_start, reg))
+ && REGNO_REG_SET_P (df_get_live_in (bb), reg))
SET_HARD_REG_BIT (info.btrs_live_in_block, reg);
for (insn = BB_HEAD (bb), last = NEXT_INSN (BB_END (bb));
}
/* Check for the blockage emitted by expand_nl_goto_receiver. */
else if (current_function_has_nonlocal_label
- && GET_CODE (PATTERN (insn)) == ASM_INPUT)
+ && GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE)
{
btr_user user;
COPY_HARD_REG_SET (btrs_live[i], info.btrs_live_in_block);
COPY_HARD_REG_SET (btrs_written[i], info.btrs_written_in_block);
- REG_SET_TO_HARD_REG_SET (btrs_live_at_end[i], bb->il.rtl->global_live_at_end);
+ REG_SET_TO_HARD_REG_SET (btrs_live_at_end[i], df_get_live_out (bb));
/* If this block ends in a jump insn, add any uses or even clobbers
of branch target registers that it might have. */
for (insn = BB_END (bb); insn != BB_HEAD (bb) && ! INSN_P (insn); )
int new_block = new_bb->index;
gcc_assert (dominated_by_p (CDI_DOMINATORS, head_bb, new_bb));
-
+
IOR_HARD_REG_SET (*btrs_live_in_range, btrs_live[head_bb->index]);
bitmap_set_bit (live_range, new_block);
/* A previous btr migration could have caused a register to be
- live just at the end of new_block which we need in full, so
- use trs_live_at_end even if full_range is set. */
+ live just at the end of new_block which we need in full, so
+ use trs_live_at_end even if full_range is set. */
IOR_HARD_REG_SET (*btrs_live_in_range, btrs_live_at_end[new_block]);
if (full_range)
IOR_HARD_REG_SET (*btrs_live_in_range, btrs_live[new_block]);
choose_btr (HARD_REG_SET used_btrs)
{
int i;
- GO_IF_HARD_REG_SUBSET (all_btrs, used_btrs, give_up);
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- {
+ if (!hard_reg_set_subset_p (all_btrs, used_btrs))
+ for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+ {
#ifdef REG_ALLOC_ORDER
- int regno = reg_alloc_order[i];
+ int regno = reg_alloc_order[i];
#else
- int regno = i;
+ int regno = i;
#endif
- if (TEST_HARD_REG_BIT (all_btrs, regno)
- && !TEST_HARD_REG_BIT (used_btrs, regno))
- return regno;
- }
-give_up:
+ if (TEST_HARD_REG_BIT (all_btrs, regno)
+ && !TEST_HARD_REG_BIT (used_btrs, regno))
+ return regno;
+ }
return -1;
}
insp = BB_END (b);
for (insp = BB_END (b); ! INSN_P (insp); insp = PREV_INSN (insp))
gcc_assert (insp != BB_HEAD (b));
-
+
if (JUMP_P (insp) || can_throw_internal (insp))
insp = PREV_INSN (insp);
}
/* Insert target register initialization at head of basic block. */
def->insn = emit_insn_after (new_insn, insp);
- regs_ever_live[btr] = 1;
+ df_set_regs_ever_live (btr, true);
if (dump_file)
fprintf (dump_file, "New pt is insn %d, inserted after insn %d\n",
replacement_rtx = btr_rtx;
else
replacement_rtx = gen_rtx_REG (GET_MODE (user->use), btr);
- replace_rtx (user->insn, user->use, replacement_rtx);
+ validate_replace_rtx (user->use, replacement_rtx, user->insn);
user->use = replacement_rtx;
}
}
/* We anticipate intra-block scheduling to be done. See if INSN could move
up within BB by N_INSNS. */
static int
-can_move_up (basic_block bb, rtx insn, int n_insns)
+can_move_up (const_basic_block bb, const_rtx insn, int n_insns)
{
while (insn != BB_HEAD (bb) && n_insns > 0)
{
/* Try to move the instruction that sets the target register into
basic block TRY. */
int try_freq = basic_block_freq (try);
+ edge_iterator ei;
+ edge e;
+
+ /* If TRY has abnormal edges, skip it. */
+ FOR_EACH_EDGE (e, ei, try->succs)
+ if (e->flags & EDGE_COMPLEX)
+ break;
+ if (e)
+ continue;
if (dump_file)
fprintf (dump_file, "trying block %d ...", try->index);
CLEAR_HARD_REG_SET (all_btrs);
for (first_btr = -1, reg = 0; reg < FIRST_PSEUDO_REGISTER; reg++)
if (TEST_HARD_REG_BIT (reg_class_contents[(int) btr_class], reg)
- && (allow_callee_save || call_used_regs[reg] || regs_ever_live[reg]))
+ && (allow_callee_save || call_used_regs[reg]
+ || df_regs_ever_live_p (reg)))
{
SET_HARD_REG_BIT (all_btrs, reg);
last_btr = reg;
fibheap_delete (all_btr_defs);
}
-void
+static void
branch_target_load_optimize (bool after_prologue_epilogue_gen)
{
enum reg_class class = targetm.branch_target_register_class ();
else
issue_rate = 1;
- /* Build the CFG for migrate_btr_defs. */
+ if (!after_prologue_epilogue_gen)
+ {
+ /* Build the CFG for migrate_btr_defs. */
#if 1
- /* This may or may not be needed, depending on where we
- run this phase. */
- cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
+ /* This may or may not be needed, depending on where we
+ run this phase. */
+ cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
#endif
+ }
+ df_analyze ();
- life_analysis (0);
/* Dominator info is also needed for migrate_btr_def. */
calculate_dominance_info (CDI_DOMINATORS);
(after_prologue_epilogue_gen)));
free_dominance_info (CDI_DOMINATORS);
-
- update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
- PROP_DEATH_NOTES | PROP_REG_INFO);
}
}
\f
static bool
-gate_handle_branch_target_load_optimize (void)
+gate_handle_branch_target_load_optimize1 (void)
+{
+ return flag_branch_target_load_optimize;
+}
+
+
+static unsigned int
+rest_of_handle_branch_target_load_optimize1 (void)
+{
+ branch_target_load_optimize (epilogue_completed);
+ return 0;
+}
+
+struct tree_opt_pass pass_branch_target_load_optimize1 =
+{
+ "btl1", /* name */
+ gate_handle_branch_target_load_optimize1, /* gate */
+ rest_of_handle_branch_target_load_optimize1, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func |
+ TODO_verify_rtl_sharing |
+ TODO_ggc_collect, /* todo_flags_finish */
+ 'd' /* letter */
+};
+
+static bool
+gate_handle_branch_target_load_optimize2 (void)
{
return (optimize > 0 && flag_branch_target_load_optimize2);
}
static unsigned int
-rest_of_handle_branch_target_load_optimize (void)
+rest_of_handle_branch_target_load_optimize2 (void)
{
static int warned = 0;
&& !warned)
{
warning (0, "branch target register load optimization is not intended "
- "to be run twice");
+ "to be run twice");
warned = 1;
}
return 0;
}
-struct tree_opt_pass pass_branch_target_load_optimize =
+struct tree_opt_pass pass_branch_target_load_optimize2 =
{
- "btl", /* name */
- gate_handle_branch_target_load_optimize, /* gate */
- rest_of_handle_branch_target_load_optimize, /* execute */
+ "btl2", /* name */
+ gate_handle_branch_target_load_optimize2, /* gate */
+ rest_of_handle_branch_target_load_optimize2, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
- 0, /* tv_id */
+ 0, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
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