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re PR target/80723 (FAIL gcc.target/i386/cadd.c scan assembler sbb) 

PR target/80723
	* config/i386/i386.c (ix86_rtx_cost) [case PLUS]: Ignore the
	cost of adding a carry flag for ADC instruction.
	[case MINUS]: Ignore the cost of subtracting a carry flag
	for SBB instruction.

From-SVN: r247991
This commit is contained in:
Uros Bizjak 2017-05-12 20:52:51 +02:00
parent b76f155009
commit 88ce9dc38a
2 changed files with 33 additions and 4 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2017-05-12 Uros Bizjak <ubizjak@gmail.com>
PR target/80723
* config/i386/i386.c (ix86_rtx_cost) [case PLUS]: Ignore the
cost of adding a carry flag for ADC instruction.
[case MINUS]: Ignore the cost of subtracting a carry flag
for SBB instruction.
2017-05-12 Steven Munroe <munroesj@gcc.gnu.org>
* config.gcc (powerpc*-*-*): Add bmi2intrin.h, bmiintrin.h,
@ -8,7 +16,7 @@
2017-05-12 Jeff Law <law@redhat.com>
* tree-vrp.c (vrp_dom_walker::before_dom_childern): Push unwinding
* tree-vrp.c (vrp_dom_walker::before_dom_children): Push unwinding
markers.
2017-05-12 Peter Bergner <bergner@vnet.ibm.com>

27
gcc/config/i386/i386.c
View File

@ -40913,9 +40913,16 @@ ix86_rtx_costs (rtx x, machine_mode mode, int outer_code_i, int opno,
}
else if (GET_CODE (XEXP (x, 0)) == PLUS)
{
*total = cost->lea;
*total += rtx_cost (XEXP (XEXP (x, 0), 0), mode,
outer_code, opno, speed);
/* Add with carry, ignore the cost of adding a carry flag. */
if (ix86_carry_flag_operator (XEXP (XEXP (x, 0), 0), mode))
*total = cost->add;
else
{
*total = cost->lea;
*total += rtx_cost (XEXP (XEXP (x, 0), 0), mode,
outer_code, opno, speed);
}
*total += rtx_cost (XEXP (XEXP (x, 0), 1), mode,
outer_code, opno, speed);
*total += rtx_cost (XEXP (x, 1), mode,
@ -40926,6 +40933,20 @@ ix86_rtx_costs (rtx x, machine_mode mode, int outer_code_i, int opno,
/* FALLTHRU */
case MINUS:
/* Subtract with borrow, ignore the cost of subtracting a carry flag. */
if (GET_MODE_CLASS (mode) == MODE_INT
&& GET_MODE_SIZE (mode) <= UNITS_PER_WORD
&& GET_CODE (XEXP (x, 0)) == MINUS
&& ix86_carry_flag_operator (XEXP (XEXP (x, 0), 1), mode))
{
*total = cost->add;
*total += rtx_cost (XEXP (XEXP (x, 0), 0), mode,
outer_code, opno, speed);
*total += rtx_cost (XEXP (x, 1), mode,
outer_code, opno, speed);
return true;
}
if (SSE_FLOAT_MODE_P (mode) && TARGET_SSE_MATH)
{
/* ??? SSE cost should be used here. */