if (dyn_castFoldableMul(RHS, C2) == LHS)
return BinaryOperator::createMul(LHS, AddOne(C2));
+ // X + ~X --> -1 since ~X = -X-1
+ if (dyn_castNotVal(LHS) == RHS ||
+ dyn_castNotVal(RHS) == LHS)
+ return ReplaceInstUsesWith(I, ConstantInt::getAllOnesValue(I.getType()));
+
// (A & C1)+(B & C2) --> (A & C1)|(B & C2) iff C1&C2 == 0
if (match(RHS, m_And(m_Value(), m_ConstantInt(C2))))
- if (Instruction *R = AssociativeOpt(I, AddMaskingAnd(C2))) return R;
+ if (Instruction *R = AssociativeOpt(I, AddMaskingAnd(C2)))
+ return R;
if (ConstantInt *CRHS = dyn_cast<ConstantInt>(RHS)) {
Value *X = 0;