diff options
Diffstat (limited to 'llvm/lib/Target/X86/README-SSE.txt')
| -rw-r--r-- | llvm/lib/Target/X86/README-SSE.txt | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/README-SSE.txt b/llvm/lib/Target/X86/README-SSE.txt index ad28248ef73..87144248e32 100644 --- a/llvm/lib/Target/X86/README-SSE.txt +++ b/llvm/lib/Target/X86/README-SSE.txt @@ -808,3 +808,34 @@ LC0: With SSE4, it should be movdqa .LC0(%rip), %xmm0 pinsrb $6, %edi, %xmm0 + +//===---------------------------------------------------------------------===// + +We should transform a shuffle of two vectors of constants into a single vector +of constants. Also, insertelement of a constant into a vector of constants +should also result in a vector of constants. e.g. 2008-06-25-VecISelBug.ll. + +We compiled it to something horrible: + + .align 4 +LCPI1_1: ## float + .long 1065353216 ## float 1 + .const + + .align 4 +LCPI1_0: ## <4 x float> + .space 4 + .long 1065353216 ## float 1 + .space 4 + .long 1065353216 ## float 1 + .text + .align 4,0x90 + .globl _t +_t: + xorps %xmm0, %xmm0 + movhps LCPI1_0, %xmm0 + movss LCPI1_1, %xmm1 + movaps %xmm0, %xmm2 + shufps $2, %xmm1, %xmm2 + shufps $132, %xmm2, %xmm0 + movaps %xmm0, 0 |
