diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index ecdb62b975..c5c2a5e3c5 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -3008,7 +3008,8 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) { } else if (Op0I->getOpcode() == Instruction::And && Op0I->hasOneUse()) { if (Op0I->getOperand(0) == Op1) // (A&B)^A -> (B&A)^A Op0I->swapOperands(); - if (Op0I->getOperand(1) == Op1) { // (B&A)^A == ~B & A + if (Op0I->getOperand(1) == Op1 && // (B&A)^A == ~B & A + !isa<ConstantInt>(Op1)) { // Canonical form is (B&C)^C Instruction *N = BinaryOperator::createNot(Op0I->getOperand(0), "tmp"); InsertNewInstBefore(N, I); return BinaryOperator::createAnd(N, Op1); |