diff options
Diffstat (limited to 'lib/Transforms/Scalar/InstructionCombining.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 5b477b3a40..f663ae6137 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -946,6 +946,11 @@ Instruction *InstCombiner::visitDiv(BinaryOperator &I) { return new ShiftInst(Instruction::Shr, I.getOperand(0), ConstantUInt::get(Type::UByteTy, C)); + // -X/C -> X/-C + if (RHS->getType()->isSigned()) + if (Value *LHSNeg = dyn_castNegVal(I.getOperand(0))) + return BinaryOperator::createDiv(LHSNeg, ConstantExpr::getNeg(RHS)); + if (isa<PHINode>(I.getOperand(0)) && !RHS->isNullValue()) if (Instruction *NV = FoldOpIntoPhi(I)) return NV; |