diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 4d96cbfcce..6824c34552 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -3550,6 +3550,15 @@ Instruction *InstCombiner::visitCastInst(CastInst &CI) { ->getOpcode(), Op0c, Op1c); } } + + // cast (xor bool X, true) to int --> xor (cast bool X to int), 1 + if (SrcBitSize == 1 && SrcI->getOpcode() == Instruction::Xor && + Op1 == ConstantBool::True && + (!Op0->hasOneUse() || !isa<SetCondInst>(Op0))) { + Value *New = InsertOperandCastBefore(Op0, DestTy, &CI); + return BinaryOperator::createXor(New, + ConstantInt::get(CI.getType(), 1)); + } break; case Instruction::Shl: // Allow changing the sign of the source operand. Do not allow changing |