https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104413
Bug ID: 104413
Summary: _mm_set1_epi8 isn't optimized for SSE2
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: crazylht at gmail dot com
Target Milestone: ---
Target: x86-64
[hjl@gnu-tgl-3 tmp]$ cat foo.c
#include <x86intrin.h>
__m128i
foo (char c)
{
return _mm_set1_epi8 (c);
}
[hjl@gnu-tgl-3 tmp]$ cat foo.s
.file "foo.c"
.text
.p2align 4
.globl foo
.type foo, @function
foo:
.LFB5670:
.cfi_startproc
movd %edi, %xmm0
punpcklbw %xmm0, %xmm0
punpcklwd %xmm0, %xmm0
pshufd $0, %xmm0, %xmm0
ret
.cfi_endproc
.LFE5670:
.size foo, .-foo
.ident "GCC: (GNU) 11.2.1 20220127 (Red Hat 11.2.1-9)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-tgl-3 tmp]$
GCC should generate
movd %edi, %xmm0
pxor %xmm1, %xmm1;
pshufb %xmm1, %xmm0
ret
