diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 2dbc70e0ff..47f6499233 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -9160,6 +9160,10 @@ Instruction *InstCombiner::visitInsertElementInst(InsertElementInst &IE) { Value *ScalarOp = IE.getOperand(1); Value *IdxOp = IE.getOperand(2); + // Inserting an undef or into an undefined place, remove this. + if (isa<UndefValue>(ScalarOp) || isa<UndefValue>(IdxOp)) + ReplaceInstUsesWith(IE, VecOp); + // If the inserted element was extracted from some other vector, and if the // indexes are constant, try to turn this into a shufflevector operation. if (ExtractElementInst *EI = dyn_cast<ExtractElementInst>(ScalarOp)) { |