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| author | Evan Cheng <evan.cheng@apple.com> | 2008-05-23 17:28:11 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-05-23 17:28:11 +0000 |
| commit | d4083d01d275de9d30b0e23a03d8bd1984c8ddab (patch) | |
| tree | 3f1ca43a0b4476c520380893324668a66b4f684c /lib/Target/X86/README-SSE.txt | |
| parent | 679860e31bd7b8f043ba1ccdc5990cb9bafd9055 (diff) | |
New entry.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51487 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/README-SSE.txt')
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index f200cbf11a..7269fa2964 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -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 |