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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51487 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-05-23 17:28:11 +00:00
parent 679860e31b
commit d4083d01d2
1 changed files with 44 additions and 0 deletions
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44
lib/Target/X86/README-SSE.txt
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@ -845,3 +845,47 @@ _f:
movaps %xmm1, %xmm0
punpckldq %xmm2, %xmm0
ret
//===---------------------------------------------------------------------===//
We compile this:
__m128i
foo2 (char x)
{
return _mm_set_epi8 (1, 0, 0, 0, 0, 0, 0, 0, 0, x, 0, 1, 0, 0, 0, 0);
}
into:
movl $1, %eax
xorps %xmm0, %xmm0
pinsrw $2, %eax, %xmm0
movzbl 4(%esp), %eax
pinsrw $3, %eax, %xmm0
movl $256, %eax
pinsrw $7, %eax, %xmm0
ret
gcc-4.2:
subl $12, %esp
movzbl 16(%esp), %eax
movdqa LC0, %xmm0
pinsrw $3, %eax, %xmm0
addl $12, %esp
ret
.const
.align 4
LC0:
.word 0
.word 0
.word 1
.word 0
.word 0
.word 0
.word 0
.word 256
With SSE4, it should be
movdqa .LC0(%rip), %xmm0
pinsrb $6, %edi, %xmm0