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MOVL shuffle (i.e. movd or movss / movsd from memory) of undef, V2 == V2

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-04-23 06:35:19 +00:00
parent 9453eea49b
commit 9293451e3f
1 changed files with 7 additions and 2 deletions
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9
lib/Target/X86/X86ISelLowering.cpp
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@ -2973,6 +2973,8 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
SDOperand PermMask = Op.getOperand(2);
MVT::ValueType VT = Op.getValueType();
unsigned NumElems = PermMask.getNumOperands();
bool V1IsUndef = V1.getOpcode() == ISD::UNDEF;
bool V2IsUndef = V2.getOpcode() == ISD::UNDEF;
if (isSplatMask(PermMask.Val)) {
if (NumElems <= 4) return Op;
@ -2980,8 +2982,10 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
return PromoteSplat(Op, DAG);
}
if (X86::isMOVLMask(PermMask.Val) ||
X86::isMOVSHDUPMask(PermMask.Val) ||
if (X86::isMOVLMask(PermMask.Val))
return (V1IsUndef) ? V2 : Op;
if (X86::isMOVSHDUPMask(PermMask.Val) ||
X86::isMOVSLDUPMask(PermMask.Val) ||
X86::isMOVHLPSMask(PermMask.Val) ||
X86::isMOVHPMask(PermMask.Val) ||
@ -3003,6 +3007,7 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
}
if (isCommutedMOVL(PermMask.Val, V2IsSplat)) {
if (V2IsUndef) return V1;
Op = CommuteVectorShuffle(Op, DAG);
V1 = Op.getOperand(0);
V2 = Op.getOperand(1);