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Don't convert to MOVLP if using shufps etc. may allow load folding.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30847 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3053,9 +3053,13 @@ static inline bool isScalarLoadToVector(SDNode *N) {
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/// V1 (and in order), and the upper half elements should come from the upper
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/// half of V2 (and in order). And since V1 will become the source of the
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/// MOVLP, it must be either a vector load or a scalar load to vector.
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static bool ShouldXformToMOVLP(SDNode *V1, SDNode *Mask) {
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static bool ShouldXformToMOVLP(SDNode *V1, SDNode *V2, SDNode *Mask) {
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if (!ISD::isNON_EXTLoad(V1) && !isScalarLoadToVector(V1))
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return false;
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// Is V2 is a vector load, don't do this transformation. We will try to use
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// load folding shufps op.
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if (ISD::isNON_EXTLoad(V2))
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return false;
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unsigned NumElems = Mask->getNumOperands();
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if (NumElems != 2 && NumElems != 4)
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@ -3497,7 +3501,7 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDOperand Op, SelectionDAG &DAG) {
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return Op;
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if (ShouldXformToMOVHLPS(PermMask.Val) ||
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ShouldXformToMOVLP(V1.Val, PermMask.Val))
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ShouldXformToMOVLP(V1.Val, V2.Val, PermMask.Val))
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return CommuteVectorShuffle(Op, DAG);
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bool V1IsSplat = isSplatVector(V1.Val);
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