Set d.one_operand_p to true when TARGET_SSSE3 in ix86_expand_vecop_qihi_partial.

pshufb is available under TARGET_SSSE3, so
ix86_expand_vec_perm_const_1 must return true when TARGET_SSSE3.

With the patch under -march=x86-64-v2

v8qi
foo (v8qi a)
{
  return a >> 5;
}

< 	pmovsxbw	%xmm0, %xmm0
< 	psraw	$5, %xmm0
< 	pshufb	.LC0(%rip), %xmm0

	vs.

> 	movdqa	%xmm0, %xmm1
> 	pcmpeqd	%xmm0, %xmm0
> 	pmovsxbw	%xmm1, %xmm1
> 	psrlw	$8, %xmm0
> 	psraw	$5, %xmm1
> 	pand	%xmm1, %xmm0
> 	packuswb	%xmm0, %xmm0

Although there's a memory load from constant pool, but it should be
better when it's inside a loop. The load from constant pool can be
hoist out. it's 1 instruction vs 4 instructions.

< 	pshufb	.LC0(%rip), %xmm0

vs.

> 	pcmpeqd	%xmm0, %xmm0
> 	psrlw	$8, %xmm0
> 	pand	%xmm1, %xmm0
> 	packuswb	%xmm0, %xmm0

gcc/ChangeLog:

	PR target/114514
	* config/i386/i386-expand.cc (ix86_expand_vecop_qihi_partial):
	Set d.one_operand_p to true when TARGET_SSSE3.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr114514-shufb.c: New test.

0 files changed, 0 insertions, 0 deletions