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riscv-gcc-1
Commit 533d4b99 by Paolo Bonzini Committed by Paolo Bonzini
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expmed.c (emit_store_flag): Check costs before transforming to the opposite representation. 

2009-10-28  Paolo Bonzini  <bonzini@gnu.org>

	* expmed.c (emit_store_flag): Check costs before
	transforming to the opposite representation.

From-SVN: r153647
parent 42663bf1
Showing with 23 additions and 6 deletions
gcc/ChangeLog
2009-10-28 Paolo Bonzini <bonzini@gnu.org>
* expmed.c (emit_store_flag): Check costs before
transforming to the opposite representation.
2009-10-28 Paolo Bonzini <bonzini@gnu.org>
* config/sh/sh.md (cbranchfp4_media): Remove hack extending
cstore result to DImode.
gcc/expmed.c
......@@ -5498,9 +5498,13 @@ emit_store_flag (rtx target, enum rtx_code code, rtx op0, rtx op1,
|| (! HONOR_NANS (mode) && (code == LTGT || code == UNEQ))
|| (! HONOR_SNANS (mode) && (code == EQ || code == NE))))
{
int want_add = ((STORE_FLAG_VALUE == 1 && normalizep == -1)
|| (STORE_FLAG_VALUE == -1 && normalizep == 1));
/* For the reverse comparison, use either an addition or a XOR. */
if ((STORE_FLAG_VALUE == 1 && normalizep == -1)
|| (STORE_FLAG_VALUE == -1 && normalizep == 1))
if (want_add
&& rtx_cost (GEN_INT (normalizep), PLUS,
optimize_insn_for_speed_p ()) == 0)
{
tem = emit_store_flag_1 (subtarget, rcode, op0, op1, mode, 0,
STORE_FLAG_VALUE, target_mode);
......@@ -5509,7 +5513,9 @@ emit_store_flag (rtx target, enum rtx_code code, rtx op0, rtx op1,
GEN_INT (normalizep),
target, 0, OPTAB_WIDEN);
}
else
else if (!want_add
&& rtx_cost (trueval, XOR,
optimize_insn_for_speed_p ()) == 0)
{
tem = emit_store_flag_1 (subtarget, rcode, op0, op1, mode, 0,
normalizep, target_mode);
......@@ -5596,9 +5602,13 @@ emit_store_flag (rtx target, enum rtx_code code, rtx op0, rtx op1,
&& GET_MODE_SIZE (mode) < UNITS_PER_WORD
&& op1 == const0_rtx))
{
int want_add = ((STORE_FLAG_VALUE == 1 && normalizep == -1)
|| (STORE_FLAG_VALUE == -1 && normalizep == 1));
/* Again, for the reverse comparison, use either an addition or a XOR. */
if ((STORE_FLAG_VALUE == 1 && normalizep == -1)
|| (STORE_FLAG_VALUE == -1 && normalizep == 1))
if (want_add
&& rtx_cost (GEN_INT (normalizep), PLUS,
optimize_insn_for_speed_p ()) == 0)
{
tem = emit_store_flag_1 (subtarget, rcode, op0, op1, mode, 0,
STORE_FLAG_VALUE, target_mode);
......@@ -5606,7 +5616,9 @@ emit_store_flag (rtx target, enum rtx_code code, rtx op0, rtx op1,
tem = expand_binop (target_mode, add_optab, tem,
GEN_INT (normalizep), target, 0, OPTAB_WIDEN);
}
else
else if (!want_add
&& rtx_cost (trueval, XOR,
optimize_insn_for_speed_p ()) == 0)
{
tem = emit_store_flag_1 (subtarget, rcode, op0, op1, mode, 0,
normalizep, target_mode);
......
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