diff options
| -rw-r--r-- | llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp index 397c6d6ecd6..cd734568ba5 100644 --- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp @@ -6704,9 +6704,13 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) { if (IE->getOperand(2) == EI.getOperand(1)) return ReplaceInstUsesWith(EI, IE->getOperand(1)); // If the inserted and extracted elements are constants, they must not - // be the same value, replace with the pre-inserted value. - if (isa<Constant>(IE->getOperand(2)) && isa<Constant>(EI.getOperand(1))) - return ReplaceInstUsesWith(EI, IE->getOperand(0)); + // be the same value, extract from the pre-inserted value instead. + if (isa<Constant>(IE->getOperand(2)) && + isa<Constant>(EI.getOperand(1))) { + AddUsesToWorkList(EI); + EI.setOperand(0, IE->getOperand(0)); + return &EI; + } } } return 0; |
