InstCombine: Don't try to reorder shuffles where the mask is a ConstantExpr.
We can't analyze the individual values of a vector expression. PR20114.
llvm-svn: 211581
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 88d7a0d..88d461e 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -1227,7 +1227,9 @@
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: