diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp index 2ad592a8f11..3e009ebce46 100644 --- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp @@ -6512,6 +6512,15 @@ static bool CanEvaluateInDifferentType(Value *V, const IntegerType *Ty, CanEvaluateInDifferentType(I->getOperand(1), Ty, CastOpc, NumCastsRemoved); + case Instruction::Mul: + break; + // A multiply can be truncated by truncating its operands. + return Ty->getBitWidth() < OrigTy->getBitWidth() && + CanEvaluateInDifferentType(I->getOperand(0), Ty, CastOpc, + NumCastsRemoved) && + CanEvaluateInDifferentType(I->getOperand(1), Ty, CastOpc, + NumCastsRemoved); + case Instruction::Shl: // If we are truncating the result of this SHL, and if it's a shift of a // constant amount, we can always perform a SHL in a smaller type. @@ -6571,6 +6580,7 @@ Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty, switch (I->getOpcode()) { case Instruction::Add: case Instruction::Sub: + case Instruction::Mul: case Instruction::And: case Instruction::Or: case Instruction::Xor: |
