/// \p KnownZero the set of bits that are known to be zero
/// \p KnownOne the set of bits that are known to be one
void computeKnownBitsFromRangeMetadata(const MDNode &Ranges,
- APInt &KnownZero, APInt &KnownOne);
+ KnownBits &Known);
/// Return true if LHS and RHS have no common bits set.
bool haveNoCommonBitsSet(const Value *LHS, const Value *RHS,
const DataLayout &DL,
}
void llvm::computeKnownBitsFromRangeMetadata(const MDNode &Ranges,
- APInt &KnownZero,
- APInt &KnownOne) {
- unsigned BitWidth = KnownZero.getBitWidth();
+ KnownBits &Known) {
+ unsigned BitWidth = Known.getBitWidth();
unsigned NumRanges = Ranges.getNumOperands() / 2;
assert(NumRanges >= 1);
- KnownZero.setAllBits();
- KnownOne.setAllBits();
+ Known.Zero.setAllBits();
+ Known.One.setAllBits();
for (unsigned i = 0; i < NumRanges; ++i) {
ConstantInt *Lower =
(Range.getUnsignedMax() ^ Range.getUnsignedMin()).countLeadingZeros();
APInt Mask = APInt::getHighBitsSet(BitWidth, CommonPrefixBits);
- KnownOne &= Range.getUnsignedMax() & Mask;
- KnownZero &= ~Range.getUnsignedMax() & Mask;
+ Known.One &= Range.getUnsignedMax() & Mask;
+ Known.Zero &= ~Range.getUnsignedMax() & Mask;
}
}
default: break;
case Instruction::Load:
if (MDNode *MD = cast<LoadInst>(I)->getMetadata(LLVMContext::MD_range))
- computeKnownBitsFromRangeMetadata(*MD, Known.Zero, Known.One);
+ computeKnownBitsFromRangeMetadata(*MD, Known);
break;
case Instruction::And: {
// If either the LHS or the RHS are Zero, the result is zero.
// and then intersect with known bits based on other properties of the
// function.
if (MDNode *MD = cast<Instruction>(I)->getMetadata(LLVMContext::MD_range))
- computeKnownBitsFromRangeMetadata(*MD, Known.Zero, Known.One);
+ computeKnownBitsFromRangeMetadata(*MD, Known);
if (const Value *RV = ImmutableCallSite(I).getReturnedArgOperand()) {
computeKnownBits(RV, Known2, Depth + 1, Q);
Known.Zero |= Known2.Zero;
Known.Zero.setBitsFrom(MemBits);
} else if (const MDNode *Ranges = LD->getRanges()) {
if (LD->getExtensionType() == ISD::NON_EXTLOAD)
- computeKnownBitsFromRangeMetadata(*Ranges, Known.Zero, Known.One);
+ computeKnownBitsFromRangeMetadata(*Ranges, Known);
}
break;
}