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Make more uses of getHighBitsSet and get rid of some pointless & of an

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APInt with its type mask.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35325 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-25 04:26:16 +00:00
parent 065421f99f
commit 2f5491791b
1 changed files with 12 additions and 12 deletions
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24
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -685,9 +685,9 @@ static void ComputeMaskedBits(Value *V, const APInt& Mask, APInt& KnownZero,
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?");
@ -700,9 +700,9 @@ static void ComputeMaskedBits(Value *V, const APInt& Mask, APInt& KnownZero,
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?");
@ -743,7 +743,7 @@ static void ComputeMaskedBits(Value *V, const APInt& Mask, APInt& KnownZero,
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));
@ -760,7 +760,7 @@ static void ComputeMaskedBits(Value *V, const APInt& Mask, APInt& KnownZero,
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));
@ -830,8 +830,7 @@ static void ComputeSignedMinMaxValuesFromKnownBits(const Type *Ty,
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));
@ -860,8 +859,7 @@ static void ComputeUnsignedMinMaxValuesFromKnownBits(const Type *Ty,
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;
@ -1118,7 +1116,8 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
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();
@ -1137,7 +1136,8 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
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()));