Lower(L), Upper(U) {
assert(L.getBitWidth() == U.getBitWidth() &&
"ConstantRange with unequal bit widths");
- uint32_t BitWidth = L.getBitWidth();
- assert((L != U || (L == APInt::getMaxValue(BitWidth) ||
- L == APInt::getMinValue(BitWidth))) &&
+ assert((L != U || (L.isMaxValue() || L.isMinValue())) &&
"Lower == Upper, but they aren't min or max value!");
}
/// isFullSet - Return true if this set contains all of the elements possible
/// for this data-type
bool ConstantRange::isFullSet() const {
- return Lower == Upper && Lower == APInt::getMaxValue(getBitWidth());
+ return Lower == Upper && Lower.isMaxValue();
}
/// isEmptySet - Return true if this set contains no members.
///
bool ConstantRange::isEmptySet() const {
- return Lower == Upper && Lower == APInt::getMinValue(getBitWidth());
+ return Lower == Upper && Lower.isMinValue();
}
/// isWrappedSet - Return true if this set wraps around the top of the range,
/// ConstantRange.
///
APInt ConstantRange::getSignedMax() const {
- APInt SignedMax = APInt::getSignedMaxValue(getBitWidth());
+ APInt SignedMax(APInt::getSignedMaxValue(getBitWidth()));
if (!isWrappedSet()) {
- if (getLower().slt(getUpper() - 1))
+ if (getLower().sle(getUpper() - 1))
return getUpper() - 1;
else
return SignedMax;
/// ConstantRange.
///
APInt ConstantRange::getSignedMin() const {
- APInt SignedMin = APInt::getSignedMinValue(getBitWidth());
+ APInt SignedMin(APInt::getSignedMinValue(getBitWidth()));
if (!isWrappedSet()) {
- if (getLower().slt(getUpper() - 1))
+ if (getLower().sle(getUpper() - 1))
return getLower();
else
return SignedMin;
return *this;
}
+/// maximalIntersectWith - Return the range that results from the intersection
+/// of this range with another range. The resultant range is guaranteed to
+/// include all elements contained in both input ranges, and to have the
+/// smallest possible set size that does so. Because there may be two
+/// intersections with the same set size, A.maximalIntersectWith(B) might not
+/// be equal to B.maximalIntersect(A).
+ConstantRange ConstantRange::maximalIntersectWith(const ConstantRange &CR) const {
+ assert(getBitWidth() == CR.getBitWidth() &&
+ "ConstantRange types don't agree!");
+
+ // Handle common cases.
+ if ( isEmptySet() || CR.isFullSet()) return *this;
+ if (CR.isEmptySet() || isFullSet()) return CR;
+
+ if (!isWrappedSet() && CR.isWrappedSet())
+ return CR.maximalIntersectWith(*this);
+
+ if (!isWrappedSet() && !CR.isWrappedSet()) {
+ if (Lower.ult(CR.Lower)) {
+ if (Upper.ule(CR.Lower))
+ return ConstantRange(getBitWidth(), false);
+
+ if (Upper.ult(CR.Upper))
+ return ConstantRange(CR.Lower, Upper);
+
+ return CR;
+ } else {
+ if (Upper.ult(CR.Upper))
+ return *this;
+
+ if (Lower.ult(CR.Upper))
+ return ConstantRange(Lower, CR.Upper);
+
+ return ConstantRange(getBitWidth(), false);
+ }
+ }
+
+ if (isWrappedSet() && !CR.isWrappedSet()) {
+ if (CR.Lower.ult(Upper)) {
+ if (CR.Upper.ult(Upper))
+ return CR;
+
+ if (CR.Upper.ult(Lower))
+ return ConstantRange(CR.Lower, Upper);
+
+ if (getSetSize().ult(CR.getSetSize()))
+ return *this;
+ else
+ return CR;
+ } else if (CR.Lower.ult(Lower)) {
+ if (CR.Upper.ule(Lower))
+ return ConstantRange(getBitWidth(), false);
+
+ return ConstantRange(Lower, CR.Upper);
+ }
+ return CR;
+ }
+
+ if (CR.Upper.ult(Upper)) {
+ if (CR.Lower.ult(Upper)) {
+ if (getSetSize().ult(CR.getSetSize()))
+ return *this;
+ else
+ return CR;
+ }
+
+ if (CR.Lower.ult(Lower))
+ return ConstantRange(Lower, CR.Upper);
+
+ return CR;
+ } else if (CR.Upper.ult(Lower)) {
+ if (CR.Lower.ult(Lower))
+ return *this;
+
+ return ConstantRange(CR.Lower, Upper);
+ }
+ if (getSetSize().ult(CR.getSetSize()))
+ return *this;
+ else
+ return CR;
+}
+
+
/// unionWith - Return the range that results from the union of this range with
/// another range. The resultant range is guaranteed to include the elements of
-/// both sets, but may contain more. For example, [3, 9) union [12,15) is [3,
-/// 15), which includes 9, 10, and 11, which were not included in either set
-/// before.
+/// both sets, but may contain more. For example, [3, 9) union [12,15) is
+/// [3, 15), which includes 9, 10, and 11, which were not included in either
+/// set before.
///
ConstantRange ConstantRange::unionWith(const ConstantRange &CR) const {
assert(getBitWidth() == CR.getBitWidth() &&
if ( isFullSet() || CR.isEmptySet()) return *this;
if (CR.isFullSet() || isEmptySet()) return CR;
+ if (!isWrappedSet() && CR.isWrappedSet()) return CR.unionWith(*this);
+
APInt L = Lower, U = Upper;
- if (!contains(CR.Lower))
- L = APIntOps::umin(L, CR.Lower);
+ if (!isWrappedSet() && !CR.isWrappedSet()) {
+ if (CR.Lower.ult(L))
+ L = CR.Lower;
+
+ if (CR.Upper.ugt(U))
+ U = CR.Upper;
+ }
+
+ if (isWrappedSet() && !CR.isWrappedSet()) {
+ if ((CR.Lower.ult(Upper) && CR.Upper.ult(Upper)) ||
+ (CR.Lower.ugt(Lower) && CR.Upper.ugt(Lower))) {
+ return *this;
+ }
+
+ if (CR.Lower.ule(Upper) && Lower.ule(CR.Upper)) {
+ return ConstantRange(getBitWidth());
+ }
+
+ if (CR.Lower.ule(Upper) && CR.Upper.ule(Lower)) {
+ APInt d1 = CR.Upper - Upper, d2 = Lower - CR.Upper;
+ if (d1.ult(d2)) {
+ U = CR.Upper;
+ } else {
+ L = CR.Upper;
+ }
+ }
+
+ if (Upper.ult(CR.Lower) && CR.Upper.ult(Lower)) {
+ APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Upper;
+ if (d1.ult(d2)) {
+ U = CR.Lower + 1;
+ } else {
+ L = CR.Upper - 1;
+ }
+ }
+
+ if (Upper.ult(CR.Lower) && Lower.ult(CR.Upper)) {
+ APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Lower;
+
+ if (d1.ult(d2)) {
+ U = CR.Lower + 1;
+ } else {
+ L = CR.Lower;
+ }
+ }
+ }
+
+ if (isWrappedSet() && CR.isWrappedSet()) {
+ if (Lower.ult(CR.Upper) || CR.Lower.ult(Upper))
+ return ConstantRange(getBitWidth());
+
+ if (CR.Upper.ugt(U)) {
+ U = CR.Upper;
+ }
+
+ if (CR.Lower.ult(L)) {
+ L = CR.Lower;
+ }
- if (!contains(CR.Upper - 1))
- U = APIntOps::umax(U, CR.Upper);
+ if (L == U) return ConstantRange(getBitWidth());
+ }
return ConstantRange(L, U);
}
return ConstantRange(L, U);
}
+/// signExtend - Return a new range in the specified integer type, which must
+/// be strictly larger than the current type. The returned range will
+/// correspond to the possible range of values as if the source range had been
+/// sign extended.
+ConstantRange ConstantRange::signExtend(uint32_t DstTySize) const {
+ unsigned SrcTySize = getBitWidth();
+ assert(SrcTySize < DstTySize && "Not a value extension");
+ if (isFullSet()) {
+ return ConstantRange(APInt::getHighBitsSet(DstTySize,DstTySize-SrcTySize+1),
+ APInt::getLowBitsSet(DstTySize, SrcTySize-1));
+ }
+
+ APInt L = Lower; L.sext(DstTySize);
+ APInt U = Upper; U.sext(DstTySize);
+ return ConstantRange(L, U);
+}
+
/// truncate - Return a new range in the specified integer type, which must be
/// strictly smaller than the current type. The returned range will
/// correspond to the possible range of values as if the source range had been
ConstantRange ConstantRange::truncate(uint32_t DstTySize) const {
unsigned SrcTySize = getBitWidth();
assert(SrcTySize > DstTySize && "Not a value truncation");
- APInt Size = APInt::getMaxValue(DstTySize).zext(SrcTySize);
+ APInt Size(APInt::getLowBitsSet(SrcTySize, DstTySize));
if (isFullSet() || getSetSize().ugt(Size))
return ConstantRange(DstTySize);
projects / oota-llvm.git / blobdiff