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ifcvt.c (cond_move_convert_if_block): New function, code factored out from...

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* ifcvt.c (cond_move_convert_if_block): New function, code
	factored out from...
	(cond_move_process_if_block): ...here.  Call the new function
	on the THEN and ELSE blocks.
	(merge_if_block): Do not copy global_live_at_end, merge_blocks
	already takes care of this.

From-SVN: r120524
This commit is contained in:
Steven Bosscher 2007-01-06 13:56:53 +00:00
parent 472017b355
commit dc1f5a1118
2 changed files with 83 additions and 78 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2007-01-06 Steven Bosscher <steven@gcc.gnu.org>
* ifcvt.c (cond_move_convert_if_block): New function, code
factored out from...
(cond_move_process_if_block): ...here. Call the new function
on the THEN and ELSE blocks.
(merge_if_block): Do not copy global_live_at_end, merge_blocks
already takes care of this.
2007-01-05 Manuel Lopez-Ibanez <manu@gcc.gnu.org>
PR c/19978

152
gcc/ifcvt.c
View File

@ -2466,6 +2466,70 @@ check_cond_move_block (basic_block bb, rtx *vals, rtx cond)
return TRUE;
}
/* Given a basic block BB suitable for conditional move conversion,
a condition COND, and arrays THEN_VALS and ELSE_VALS containing the
register values depending on COND, emit the insns in the block as
conditional moves. If ELSE_BLOCK is true, THEN_BB was already
processed. The caller has started a sequence for the conversion.
Return true if successful, false if something goes wrong. */
static bool
cond_move_convert_if_block (struct noce_if_info *if_infop,
basic_block bb, rtx cond,
rtx *then_vals, rtx *else_vals,
bool else_block_p)
{
enum rtx_code code;
rtx insn, cond_arg0, cond_arg1;
code = GET_CODE (cond);
cond_arg0 = XEXP (cond, 0);
cond_arg1 = XEXP (cond, 1);
FOR_BB_INSNS (bb, insn)
{
rtx set, target, dest, t, e;
unsigned int regno;
if (!INSN_P (insn) || JUMP_P (insn))
continue;
set = single_set (insn);
gcc_assert (set && REG_P (SET_DEST (set)));
dest = SET_DEST (set);
regno = REGNO (dest);
t = then_vals[regno];
e = else_vals[regno];
if (else_block_p)
{
/* If this register was set in the then block, we already
handled this case there. */
if (t)
continue;
t = dest;
gcc_assert (e);
}
else
{
gcc_assert (t);
if (!e)
e = dest;
}
target = noce_emit_cmove (if_infop, dest, code, cond_arg0, cond_arg1,
t, e);
if (!target)
return false;
if (target != dest)
noce_emit_move_insn (dest, target);
}
return true;
}
/* Given a simple IF-THEN or IF-THEN-ELSE block, attempt to convert it
using only conditional moves. Return TRUE if we were successful at
converting the block. */
@ -2476,11 +2540,10 @@ cond_move_process_if_block (struct ce_if_block *ce_info)
basic_block then_bb = ce_info->then_bb;
basic_block else_bb = ce_info->else_bb;
struct noce_if_info if_info;
rtx jump, cond, insn, seq, cond_arg0, cond_arg1, loc_insn;
rtx jump, cond, insn, seq, loc_insn;
int max_reg, size, c, i;
rtx *then_vals;
rtx *else_vals;
enum rtx_code code;
if (!HAVE_conditional_move || no_new_pseudos)
return FALSE;
@ -2537,78 +2600,18 @@ cond_move_process_if_block (struct ce_if_block *ce_info)
if (c > MAX_CONDITIONAL_EXECUTE)
return FALSE;
/* Emit the conditional moves. First do the then block, then do
anything left in the else blocks. */
code = GET_CODE (cond);
cond_arg0 = XEXP (cond, 0);
cond_arg1 = XEXP (cond, 1);
/* Try to emit the conditional moves. First do the then block,
then do anything left in the else blocks. */
start_sequence ();
FOR_BB_INSNS (then_bb, insn)
if (!cond_move_convert_if_block (&if_info, then_bb, cond,
then_vals, else_vals, false)
|| (else_bb
&& !cond_move_convert_if_block (&if_info, else_bb, cond,
then_vals, else_vals, true)))
{
rtx set, target, dest, t, e;
unsigned int regno;
if (!INSN_P (insn) || JUMP_P (insn))
continue;
set = single_set (insn);
gcc_assert (set && REG_P (SET_DEST (set)));
dest = SET_DEST (set);
regno = REGNO (dest);
t = then_vals[regno];
e = else_vals[regno];
gcc_assert (t);
if (!e)
e = dest;
target = noce_emit_cmove (&if_info, dest, code, cond_arg0, cond_arg1,
t, e);
if (!target)
{
end_sequence ();
return FALSE;
}
if (target != dest)
noce_emit_move_insn (dest, target);
end_sequence ();
return FALSE;
}
if (else_bb)
{
FOR_BB_INSNS (else_bb, insn)
{
rtx set, target, dest;
unsigned int regno;
if (!INSN_P (insn) || JUMP_P (insn))
continue;
set = single_set (insn);
gcc_assert (set && REG_P (SET_DEST (set)));
dest = SET_DEST (set);
regno = REGNO (dest);
/* If this register was set in the then block, we already
handled this case above. */
if (then_vals[regno])
continue;
gcc_assert (else_vals[regno]);
target = noce_emit_cmove (&if_info, dest, code, cond_arg0, cond_arg1,
dest, else_vals[regno]);
if (!target)
{
end_sequence ();
return FALSE;
}
if (target != dest)
noce_emit_move_insn (dest, target);
}
}
seq = end_ifcvt_sequence (&if_info);
if (!seq)
return FALSE;
@ -2711,9 +2714,6 @@ merge_if_block (struct ce_if_block * ce_info)
if (then_bb)
{
if (combo_bb->il.rtl->global_live_at_end)
COPY_REG_SET (combo_bb->il.rtl->global_live_at_end,
then_bb->il.rtl->global_live_at_end);
merge_blocks (combo_bb, then_bb);
num_true_changes++;
}
@ -2764,10 +2764,6 @@ merge_if_block (struct ce_if_block * ce_info)
&& join_bb != EXIT_BLOCK_PTR)
{
/* We can merge the JOIN. */
if (combo_bb->il.rtl->global_live_at_end)
COPY_REG_SET (combo_bb->il.rtl->global_live_at_end,
join_bb->il.rtl->global_live_at_end);
merge_blocks (combo_bb, join_bb);
num_true_changes++;
}