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re PR target/79354 (-mcpu=power8 -O2 generates power9 instruction on powerpc64le-linux)

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PR target/79354
	* config/rs6000/rs6000.md (movsi_from_sf): Use wb constraint instead of
	wu for stxssp alternative.

	* gcc.target/powerpc/pr79354.c: New test.
	* gcc.c-torture/execute/pr79354.c: New test.

From-SVN: r245157
This commit is contained in:
Jakub Jelinek 2017-02-03 18:34:56 +01:00 • committed by Jakub Jelinek
parent 3f3430400b
commit 437f0a81bd
5 changed files with 65 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-02-03 Jakub Jelinek <jakub@redhat.com>
PR target/79354
* config/rs6000/rs6000.md (movsi_from_sf): Use wb constraint instead of
wu for stxssp alternative.
2017-02-03 Martin Sebor <msebor@redhat.com>
PR tree-optimization/79352

2
gcc/config/rs6000/rs6000.md
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@ -6814,7 +6814,7 @@
(unspec:SI [(match_operand:SF 1 "input_operand"
"r, m, Z, Z, r,
f, wu, wu, wIwH, r,
f, wb, wu, wIwH, r,
wK")]
UNSPEC_SI_FROM_SF))

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2017-02-03 Jakub Jelinek <jakub@redhat.com>
PR target/79354
* gcc.target/powerpc/pr79354.c: New test.
* gcc.c-torture/execute/pr79354.c: New test.
2017-02-03 Martin Sebor <msebor@redhat.com>
PR tree-optimization/79352

30
gcc/testsuite/gcc.c-torture/execute/pr79354.c Normal file
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@ -0,0 +1,30 @@
/* PR target/79354 */
int b, f, g;
float e;
unsigned long d;
__attribute__((noinline, noclone)) void
foo (int *a)
{
for (g = 0; g < 32; g++)
if (f)
{
e = d;
__builtin_memcpy (&b, &e, sizeof (float));
b = *a;
}
}
int
main ()
{
int h = 5;
f = 1;
asm volatile ("" : : : "memory");
foo (&h);
asm volatile ("" : : : "memory");
foo (&b);
asm volatile ("" : : : "memory");
return 0;
}

22
gcc/testsuite/gcc.target/powerpc/pr79354.c Normal file
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@ -0,0 +1,22 @@
/* PR target/79354 */
/* { dg-do compile } */
/* { dg-skip-if "do not override -mcpu" { powerpc*-*-* } { "-mcpu=*" } { "-mcpu=power8" } } */
/* { dg-require-effective-target powerpc_p8vector_ok } */
/* { dg-options "-mcpu=power8 -O2" } */
/* { dg-final { scan-assembler-not {\mstxssp\M} } } */
int b, f, g;
float e;
unsigned long d;
void
foo (int *a)
{
for (g = 0; g < 32; g++)
if (f)
{
e = d;
__builtin_memcpy (&b, &e, sizeof (float));
b = *a;
}
}