if (ShiftAmt1 == ShiftAmt2) {
// If we have ((X >>? C) << C), turn this into X & (-1 << C).
if (I.getOpcode() == Instruction::Shl) {
- uint64_t Mask = -1ULL << ShiftAmt1;
+ uint64_t Mask = Ty->getBitMask() << ShiftAmt1;
return BinaryOperator::createAnd(X, ConstantInt::get(Ty, Mask));
}
// If we have ((X << C) >>u C), turn this into X & (-1 >>u C).
if (I.getOpcode() == Instruction::LShr) {
- uint64_t Mask = -1ULL >> ShiftAmt1;
+ uint64_t Mask = Ty->getBitMask() >> ShiftAmt1;
return BinaryOperator::createAnd(X, ConstantInt::get(Ty, Mask));
}
// We can simplify ((X << C) >>s C) into a trunc + sext.