ConstantRange ConstantRange::makeICmpRegion(unsigned Pred,
const ConstantRange &CR) {
+ if (CR.isEmptySet())
+ return CR;
+
uint32_t W = CR.getBitWidth();
switch (Pred) {
default: assert(!"Invalid ICmp predicate to makeICmpRegion()");
if (CR.isSingleElement())
return ConstantRange(CR.getUpper(), CR.getLower());
return ConstantRange(W);
- case ICmpInst::ICMP_ULT:
- return ConstantRange(APInt::getMinValue(W), CR.getUnsignedMax());
- case ICmpInst::ICMP_SLT:
- return ConstantRange(APInt::getSignedMinValue(W), CR.getSignedMax());
+ case ICmpInst::ICMP_ULT: {
+ APInt UMax(CR.getUnsignedMax());
+ if (UMax.isMinValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(APInt::getMinValue(W), UMax);
+ }
+ case ICmpInst::ICMP_SLT: {
+ APInt SMax(CR.getSignedMax());
+ if (SMax.isMinSignedValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(APInt::getSignedMinValue(W), SMax);
+ }
case ICmpInst::ICMP_ULE: {
APInt UMax(CR.getUnsignedMax());
if (UMax.isMaxValue())
}
case ICmpInst::ICMP_SLE: {
APInt SMax(CR.getSignedMax());
- if (SMax.isMaxSignedValue() || (SMax+1).isMaxSignedValue())
+ if (SMax.isMaxSignedValue())
return ConstantRange(W);
return ConstantRange(APInt::getSignedMinValue(W), SMax + 1);
}
- case ICmpInst::ICMP_UGT:
- return ConstantRange(CR.getUnsignedMin() + 1, APInt::getNullValue(W));
- case ICmpInst::ICMP_SGT:
- return ConstantRange(CR.getSignedMin() + 1,
- APInt::getSignedMinValue(W));
+ case ICmpInst::ICMP_UGT: {
+ APInt UMin(CR.getUnsignedMin());
+ if (UMin.isMaxValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(UMin + 1, APInt::getNullValue(W));
+ }
+ case ICmpInst::ICMP_SGT: {
+ APInt SMin(CR.getSignedMin());
+ if (SMin.isMaxSignedValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(SMin + 1, APInt::getSignedMinValue(W));
+ }
case ICmpInst::ICMP_UGE: {
APInt UMin(CR.getUnsignedMin());
if (UMin.isMinValue())
// Change into [0, 1 << src bit width)
return ConstantRange(APInt(DstTySize,0), APInt(DstTySize,1).shl(SrcTySize));
- APInt L = Lower; L.zext(DstTySize);
- APInt U = Upper; U.zext(DstTySize);
- return ConstantRange(L, U);
+ return ConstantRange(Lower.zext(DstTySize), Upper.zext(DstTySize));
}
/// signExtend - Return a new range in the specified integer type, which must
APInt::getLowBitsSet(DstTySize, SrcTySize-1) + 1);
}
- APInt L = Lower; L.sext(DstTySize);
- APInt U = Upper; U.sext(DstTySize);
- return ConstantRange(L, U);
+ return ConstantRange(Lower.sext(DstTySize), Upper.sext(DstTySize));
}
/// truncate - Return a new range in the specified integer type, which must be
if (isFullSet() || getSetSize().ugt(Size))
return ConstantRange(DstTySize, /*isFullSet=*/true);
- APInt L = Lower; L.trunc(DstTySize);
- APInt U = Upper; U.trunc(DstTySize);
- return ConstantRange(L, U);
+ return ConstantRange(Lower.trunc(DstTySize), Upper.trunc(DstTySize));
}
/// zextOrTrunc - make this range have the bit width given by \p DstTySize. The