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InstCombine: Don't try to reorder shuffles where the mask is a ConstantExpr.

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We can't analyze the individual values of a vector expression. PR20114.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211581 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-06-24 10:38:10 +00:00
parent f396732d9b
commit 9c88403625
2 changed files with 12 additions and 1 deletions
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4
lib/Transforms/InstCombine/InstructionCombining.cpp
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@@ -1227,7 +1227,9 @@ Value *InstCombiner::SimplifyVectorOp(BinaryOperator &Inst) {
if (isa<ShuffleVectorInst>(RHS)) Shuffle = cast<ShuffleVectorInst>(RHS);
if (isa<Constant>(LHS)) C1 = cast<Constant>(LHS);
if (isa<Constant>(RHS)) C1 = cast<Constant>(RHS);
if (Shuffle && C1 && isa<UndefValue>(Shuffle->getOperand(1)) &&
if (Shuffle && C1 &&
(isa<ConstantVector>(C1) || isa<ConstantDataVector>(C1)) &&
isa<UndefValue>(Shuffle->getOperand(1)) &&
Shuffle->getType() == Shuffle->getOperand(0)->getType()) {
SmallVector<int, 16> ShMask = Shuffle->getShuffleMask();
// Find constant C2 that has property: