diff options
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 30a1de23aa..3a099af9e9 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -4437,7 +4437,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantUInt *Op1, Op0BO->getName()); InsertNewInstBefore(YS, I); // (Y << C) Instruction *X = - BinaryOperator::create(Op0BO->getOpcode(), YS, V1, + BinaryOperator::create(Op0BO->getOpcode(), V1, YS, Op0BO->getOperand(0)->getName()); InsertNewInstBefore(X, I); // (X + (Y << C)) Constant *C2 = ConstantInt::getAllOnesValue(X->getType()); @@ -4445,6 +4445,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantUInt *Op1, return BinaryOperator::createAnd(X, C2); } + // Turn (((X >> C)&CC) + Y) << C -> (X + (Y << C)) & (CC << C) if (isLeftShift && Op0BO->getOperand(0)->hasOneUse() && match(Op0BO->getOperand(0), m_And(m_Shr(m_Value(V1), m_Value(V2)), @@ -4460,7 +4461,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantUInt *Op1, V1->getName()+".mask"); InsertNewInstBefore(XM, I); // X & (CC << C) - return BinaryOperator::create(Op0BO->getOpcode(), YS, XM); + return BinaryOperator::create(Op0BO->getOpcode(), XM, YS); } break; |