diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 912ab2db60..c63ba68bc0 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -9109,6 +9109,17 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) { if (Value *Elt = FindScalarElement(EI.getOperand(0), IndexVal)) return ReplaceInstUsesWith(EI, Elt); + + // If the this extractelement is directly using a bitcast from a vector of + // the same number of elements, see if we can find the source element from + // it. In this case, we will end up needing to bitcast the scalars. + if (BitCastInst *BCI = dyn_cast<BitCastInst>(EI.getOperand(0))) { + if (const VectorType *VT = + dyn_cast<VectorType>(BCI->getOperand(0)->getType())) + if (VT->getNumElements() == VectorWidth) + if (Value *Elt = FindScalarElement(BCI->getOperand(0), IndexVal)) + return new BitCastInst(Elt, EI.getType()); + } } if (Instruction *I = dyn_cast<Instruction>(EI.getOperand(0))) { |