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Fix reordering of shuffles and binary operations

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Do not apply transformation:

    BinOp(shuffle(v1), shuffle(v2)) -> shuffle(BinOp(v1, v2))

if operands v1 and v2 are of different size.
This change fixes PR19717, which was caused by r208488.
    


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208518 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Serge Pavlov
2014-05-12 05:44:53 +00:00
parent 8b6f7428b0
commit 0795830269
2 changed files with 13 additions and 0 deletions
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lib/Transforms/InstCombine/InstructionCombining.cpp
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@@ -1120,6 +1120,7 @@ Value *InstCombiner::SimplifyVectorOp(BinaryOperator &Inst) {
ShuffleVectorInst *RShuf = cast<ShuffleVectorInst>(RHS);
if (isa<UndefValue>(LShuf->getOperand(1)) &&
isa<UndefValue>(RShuf->getOperand(1)) &&
LShuf->getOperand(0)->getType() == RShuf->getOperand(0)->getType() &&
LShuf->getMask() == RShuf->getMask()) {
BinaryOperator *NewBO = CreateBinOpAsGiven(Inst, LShuf->getOperand(0),
RShuf->getOperand(0), Builder);