case Instruction::ZExt: {
// Compute the bits in the result that are not present in the input.
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
- APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
-
uint32_t SrcBitWidth = SrcTy->getBitWidth();
+ APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
+
ComputeMaskedBits(I->getOperand(0), APInt(Mask).trunc(SrcBitWidth),
KnownZero.trunc(SrcBitWidth), KnownOne.trunc(SrcBitWidth), Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
case Instruction::SExt: {
// Compute the bits in the result that are not present in the input.
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
- APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
-
uint32_t SrcBitWidth = SrcTy->getBitWidth();
+ APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
+
ComputeMaskedBits(I->getOperand(0), APInt(Mask).trunc(SrcBitWidth),
KnownZero.trunc(SrcBitWidth), KnownOne.trunc(SrcBitWidth), Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
if (ConstantInt *SA = dyn_cast<ConstantInt>(I->getOperand(1))) {
// Compute the new bits that are at the top now.
uint64_t ShiftAmt = SA->getZExtValue();
- APInt HighBits(APInt::getAllOnesValue(BitWidth).shl(BitWidth-ShiftAmt));
+ APInt HighBits(APInt::getHighBitsSet(BitWidth, ShiftAmt));
// Unsigned shift right.
APInt Mask2(Mask.shl(ShiftAmt));
if (ConstantInt *SA = dyn_cast<ConstantInt>(I->getOperand(1))) {
// Compute the new bits that are at the top now.
uint64_t ShiftAmt = SA->getZExtValue();
- APInt HighBits(APInt::getAllOnesValue(BitWidth).shl(BitWidth-ShiftAmt));
+ APInt HighBits(APInt::getHighBitsSet(BitWidth, ShiftAmt));
// Signed shift right.
APInt Mask2(Mask.shl(ShiftAmt));
KnownOne.getBitWidth() == BitWidth &&
Min.getBitWidth() == BitWidth && Max.getBitWidth() == BitWidth &&
"Ty, KnownZero, KnownOne and Min, Max must have equal bitwidth.");
- APInt TypeBits(APInt::getAllOnesValue(BitWidth));
- APInt UnknownBits = ~(KnownZero|KnownOne) & TypeBits;
+ APInt UnknownBits = ~(KnownZero|KnownOne);
APInt SignBit(APInt::getSignBit(BitWidth));
KnownOne.getBitWidth() == BitWidth &&
Min.getBitWidth() == BitWidth && Max.getBitWidth() &&
"Ty, KnownZero, KnownOne and Min, Max must have equal bitwidth.");
- APInt TypeBits(APInt::getAllOnesValue(BitWidth));
- APInt UnknownBits = ~(KnownZero|KnownOne) & TypeBits;
+ APInt UnknownBits = ~(KnownZero|KnownOne);
// The minimum value is when the unknown bits are all zeros.
Min = KnownOne;
case Instruction::ZExt: {
// Compute the bits in the result that are not present in the input.
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
- APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
+ uint32_t SrcBitWidth = SrcTy->getBitWidth();
+ APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
DemandedMask &= SrcTy->getMask().zext(BitWidth);
uint32_t zextBf = SrcTy->getBitWidth();
case Instruction::SExt: {
// Compute the bits in the result that are not present in the input.
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
- APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
+ uint32_t SrcBitWidth = SrcTy->getBitWidth();
+ APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
// Get the sign bit for the source type
APInt InSignBit(APInt::getSignBit(SrcTy->getPrimitiveSizeInBits()));