diff options
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/README-SSE.txt | 31 | ||||
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 7 |
2 files changed, 34 insertions, 4 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 diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 16714427ba5..bc7a4aec2ba 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -2933,12 +2933,12 @@ unsigned getNumOfConsecutiveZeros(SDOperand Op, SDOperand Mask, SelectionDAG &DAG) { unsigned NumZeros = 0; for (unsigned i = 0; i < NumElems; ++i) { - SDOperand Idx = Mask.getOperand(Low ? i : NumElems-i-1); + unsigned Index = Low ? i : NumElems-i-1; + SDOperand Idx = Mask.getOperand(Index); if (Idx.getOpcode() == ISD::UNDEF) { ++NumZeros; continue; } - unsigned Index = cast<ConstantSDNode>(Idx)->getValue(); SDOperand Elt = DAG.getShuffleScalarElt(Op.Val, Index); if (Elt.Val && isZeroNode(Elt)) ++NumZeros; @@ -6373,8 +6373,7 @@ static bool EltsFromConsecutiveLoads(SDNode *N, SDOperand PermMask, continue; } - unsigned Index = cast<ConstantSDNode>(Idx)->getValue(); - SDOperand Elt = DAG.getShuffleScalarElt(N, Index); + SDOperand Elt = DAG.getShuffleScalarElt(N, i); if (!Elt.Val || (Elt.getOpcode() != ISD::UNDEF && !ISD::isNON_EXTLoad(Elt.Val))) return false; |
