//
//===----------------------------------------------------------------------===//
+#include "llvm/InstrTypes.h"
#include "llvm/Support/ConstantRange.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
-/// Initialize a range to hold the single specified value.
-///
-ConstantRangeBase::ConstantRangeBase(const APInt & V)
- : Lower(V), Upper(V + 1) {}
-
-ConstantRangeBase::ConstantRangeBase(const APInt &L, const APInt &U)
- : Lower(L), Upper(U) {
- assert(L.getBitWidth() == U.getBitWidth() &&
- "ConstantRange with unequal bit widths");
-}
-
-/// print - Print out the bounds to a stream...
-///
-void ConstantRangeBase::print(raw_ostream &OS) const {
- OS << "[" << Lower << "," << Upper << ")";
-}
-
-/// dump - Allow printing from a debugger easily...
-///
-void ConstantRangeBase::dump() const {
- print(errs());
-}
-
-std::ostream &llvm::operator<<(std::ostream &o,
- const ConstantRangeBase &CR) {
- raw_os_ostream OS(o);
- OS << CR;
- return o;
-}
-
/// Initialize a full (the default) or empty set for the specified type.
///
-ConstantRange::ConstantRange(uint32_t BitWidth, bool Full) :
- ConstantRangeBase(APInt(BitWidth, 0), APInt(BitWidth, 0)) {
+ConstantRange::ConstantRange(uint32_t BitWidth, bool Full) {
if (Full)
Lower = Upper = APInt::getMaxValue(BitWidth);
else
/// Initialize a range to hold the single specified value.
///
-ConstantRange::ConstantRange(const APInt & V) : ConstantRangeBase(V) {}
+ConstantRange::ConstantRange(const APInt &V) : Lower(V), Upper(V + 1) {}
-ConstantRange::ConstantRange(const APInt &L, const APInt &U)
- : ConstantRangeBase(L, U) {
+ConstantRange::ConstantRange(const APInt &L, const APInt &U) :
+ Lower(L), Upper(U) {
+ assert(L.getBitWidth() == U.getBitWidth() &&
+ "ConstantRange with unequal bit widths");
assert((L != U || (L.isMaxValue() || L.isMinValue())) &&
"Lower == Upper, but they aren't min or max value!");
}
+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()");
+ case CmpInst::ICMP_EQ:
+ return CR;
+ case CmpInst::ICMP_NE:
+ if (CR.isSingleElement())
+ return ConstantRange(CR.getUpper(), CR.getLower());
+ return ConstantRange(W);
+ case CmpInst::ICMP_ULT: {
+ APInt UMax(CR.getUnsignedMax());
+ if (UMax.isMinValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(APInt::getMinValue(W), UMax);
+ }
+ case CmpInst::ICMP_SLT: {
+ APInt SMax(CR.getSignedMax());
+ if (SMax.isMinSignedValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(APInt::getSignedMinValue(W), SMax);
+ }
+ case CmpInst::ICMP_ULE: {
+ APInt UMax(CR.getUnsignedMax());
+ if (UMax.isMaxValue())
+ return ConstantRange(W);
+ return ConstantRange(APInt::getMinValue(W), UMax + 1);
+ }
+ case CmpInst::ICMP_SLE: {
+ APInt SMax(CR.getSignedMax());
+ if (SMax.isMaxSignedValue())
+ return ConstantRange(W);
+ return ConstantRange(APInt::getSignedMinValue(W), SMax + 1);
+ }
+ case CmpInst::ICMP_UGT: {
+ APInt UMin(CR.getUnsignedMin());
+ if (UMin.isMaxValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(UMin + 1, APInt::getNullValue(W));
+ }
+ case CmpInst::ICMP_SGT: {
+ APInt SMin(CR.getSignedMin());
+ if (SMin.isMaxSignedValue())
+ return ConstantRange(W, /* empty */ false);
+ return ConstantRange(SMin + 1, APInt::getSignedMinValue(W));
+ }
+ case CmpInst::ICMP_UGE: {
+ APInt UMin(CR.getUnsignedMin());
+ if (UMin.isMinValue())
+ return ConstantRange(W);
+ return ConstantRange(UMin, APInt::getNullValue(W));
+ }
+ case CmpInst::ICMP_SGE: {
+ APInt SMin(CR.getSignedMin());
+ if (SMin.isMinSignedValue())
+ return ConstantRange(W);
+ return ConstantRange(SMin, APInt::getSignedMinValue(W));
+ }
+ }
+}
+
/// isFullSet - Return true if this set contains all of the elements possible
/// for this data-type
bool ConstantRange::isFullSet() const {
return Lower.ugt(Upper);
}
+/// isSignWrappedSet - Return true if this set wraps around the INT_MIN of
+/// its bitwidth, for example: i8 [120, 140).
+///
+bool ConstantRange::isSignWrappedSet() const {
+ return contains(APInt::getSignedMaxValue(getBitWidth())) &&
+ contains(APInt::getSignedMinValue(getBitWidth()));
+}
+
/// getSetSize - Return the number of elements in this set.
///
APInt ConstantRange::getSetSize() const {
else
return SignedMax;
} else {
- if ((getUpper() - 1).slt(getLower())) {
- if (getLower() != SignedMax)
- return SignedMax;
- else
- return getUpper() - 1;
- } else {
+ if (getLower().isNegative() == getUpper().isNegative())
+ return SignedMax;
+ else
return getUpper() - 1;
- }
}
}
return Lower.ule(V) || V.ult(Upper);
}
+/// contains - Return true if the argument is a subset of this range.
+/// Two equal sets contain each other. The empty set contained by all other
+/// sets.
+///
+bool ConstantRange::contains(const ConstantRange &Other) const {
+ if (isFullSet() || Other.isEmptySet()) return true;
+ if (isEmptySet() || Other.isFullSet()) return false;
+
+ if (!isWrappedSet()) {
+ if (Other.isWrappedSet())
+ return false;
+
+ return Lower.ule(Other.getLower()) && Other.getUpper().ule(Upper);
+ }
+
+ if (!Other.isWrappedSet())
+ return Other.getUpper().ule(Upper) ||
+ Lower.ule(Other.getLower());
+
+ return Other.getUpper().ule(Upper) && Lower.ule(Other.getLower());
+}
+
/// subtract - Subtract the specified constant from the endpoints of this
/// constant range.
ConstantRange ConstantRange::subtract(const APInt &Val) const {
return ConstantRange(Lower - Val, Upper - Val);
}
-
-// intersect1Wrapped - This helper function is used to intersect two ranges when
-// it is known that LHS is wrapped and RHS isn't.
-//
-ConstantRange
-ConstantRange::intersect1Wrapped(const ConstantRange &LHS,
- const ConstantRange &RHS) {
- assert(LHS.isWrappedSet() && !RHS.isWrappedSet());
-
- // Check to see if we overlap on the Left side of RHS...
- //
- if (RHS.Lower.ult(LHS.Upper)) {
- // We do overlap on the left side of RHS, see if we overlap on the right of
- // RHS...
- if (RHS.Upper.ugt(LHS.Lower)) {
- // Ok, the result overlaps on both the left and right sides. See if the
- // resultant interval will be smaller if we wrap or not...
- //
- if (LHS.getSetSize().ult(RHS.getSetSize()))
- return LHS;
- else
- return RHS;
-
- } else {
- // No overlap on the right, just on the left.
- return ConstantRange(RHS.Lower, LHS.Upper);
- }
- } else {
- // We don't overlap on the left side of RHS, see if we overlap on the right
- // of RHS...
- if (RHS.Upper.ugt(LHS.Lower)) {
- // Simple overlap...
- return ConstantRange(LHS.Lower, RHS.Upper);
- } else {
- // No overlap...
- return ConstantRange(LHS.getBitWidth(), false);
- }
- }
-}
-
/// intersectWith - Return the range that results from the intersection of this
-/// range with another range.
-///
+/// 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.intersectWith(B) might not be equal to B.intersectWith(A).
ConstantRange ConstantRange::intersectWith(const ConstantRange &CR) const {
- assert(getBitWidth() == CR.getBitWidth() &&
- "ConstantRange types don't agree!");
- // Handle common special cases
- if (isEmptySet() || CR.isFullSet())
- return *this;
- if (isFullSet() || CR.isEmptySet())
- return CR;
-
- if (!isWrappedSet()) {
- if (!CR.isWrappedSet()) {
- APInt L = APIntOps::umax(Lower, CR.Lower);
- APInt U = APIntOps::umin(Upper, CR.Upper);
-
- if (L.ult(U)) // If range isn't empty...
- return ConstantRange(L, U);
- else
- return ConstantRange(getBitWidth(), false);// Otherwise, empty set
- } else
- return intersect1Wrapped(CR, *this);
- } else { // We know "this" is wrapped...
- if (!CR.isWrappedSet())
- return intersect1Wrapped(*this, CR);
- else {
- // Both ranges are wrapped...
- APInt L = APIntOps::umax(Lower, CR.Lower);
- APInt U = APIntOps::umin(Upper, CR.Upper);
- return ConstantRange(L, U);
- }
- }
- 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!");
if (CR.isEmptySet() || isFullSet()) return CR;
if (!isWrappedSet() && CR.isWrappedSet())
- return CR.maximalIntersectWith(*this);
+ return CR.intersectWith(*this);
if (!isWrappedSet() && !CR.isWrappedSet()) {
if (Lower.ult(CR.Lower)) {
if (!isWrappedSet() && CR.isWrappedSet()) return CR.unionWith(*this);
- APInt L = Lower, U = Upper;
-
if (!isWrappedSet() && !CR.isWrappedSet()) {
+ if (CR.Upper.ult(Lower) || Upper.ult(CR.Lower)) {
+ // If the two ranges are disjoint, find the smaller gap and bridge it.
+ APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Upper;
+ if (d1.ult(d2))
+ return ConstantRange(Lower, CR.Upper);
+ else
+ return ConstantRange(CR.Lower, Upper);
+ }
+
+ APInt L = Lower, U = Upper;
if (CR.Lower.ult(L))
L = CR.Lower;
-
- if (CR.Upper.ugt(U))
+ if ((CR.Upper - 1).ugt(U - 1))
U = CR.Upper;
+
+ if (L == 0 && U == 0)
+ return ConstantRange(getBitWidth());
+
+ return ConstantRange(L, U);
}
- if (isWrappedSet() && !CR.isWrappedSet()) {
- if ((CR.Lower.ult(Upper) && CR.Upper.ult(Upper)) ||
- (CR.Lower.ugt(Lower) && CR.Upper.ugt(Lower))) {
+ if (!CR.isWrappedSet()) {
+ // ------U L----- and ------U L----- : this
+ // L--U L--U : CR
+ if (CR.Upper.ule(Upper) || CR.Lower.uge(Lower))
return *this;
- }
- if (CR.Lower.ule(Upper) && Lower.ule(CR.Upper)) {
+ // ------U L----- : this
+ // L---------U : CR
+ 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)) {
+ // ----U L---- : this
+ // L---U : CR
+ // <d1> <d2>
+ if (Upper.ule(CR.Lower) && CR.Upper.ule(Lower)) {
APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Upper;
- if (d1.ult(d2)) {
- U = CR.Lower + 1;
- } else {
- L = CR.Upper - 1;
- }
+ if (d1.ult(d2))
+ return ConstantRange(Lower, CR.Upper);
+ else
+ return ConstantRange(CR.Lower, Upper);
}
- if (Upper.ult(CR.Lower) && Lower.ult(CR.Upper)) {
- APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Lower;
+ // ----U L----- : this
+ // L----U : CR
+ if (Upper.ult(CR.Lower) && Lower.ult(CR.Upper))
+ return ConstantRange(CR.Lower, Upper);
- if (d1.ult(d2)) {
- U = CR.Lower + 1;
- } else {
- L = CR.Lower;
- }
- }
+ // ------U L---- : this
+ // L-----U : CR
+ if (CR.Lower.ult(Upper) && CR.Upper.ult(Lower))
+ return ConstantRange(Lower, CR.Upper);
}
- if (isWrappedSet() && CR.isWrappedSet()) {
- if (Lower.ult(CR.Upper) || CR.Lower.ult(Upper))
- return ConstantRange(getBitWidth());
-
- if (CR.Upper.ugt(U)) {
- U = CR.Upper;
- }
+ assert(isWrappedSet() && CR.isWrappedSet() &&
+ "ConstantRange::unionWith missed wrapped union unwrapped case");
- if (CR.Lower.ult(L)) {
- L = CR.Lower;
- }
+ // ------U L---- and ------U L---- : this
+ // -U L----------- and ------------U L : CR
+ if (CR.Lower.ule(Upper) || Lower.ule(CR.Upper))
+ return ConstantRange(getBitWidth());
- if (L == U) return ConstantRange(getBitWidth());
- }
+ APInt L = Lower, U = Upper;
+ if (CR.Upper.ugt(U))
+ U = CR.Upper;
+ if (CR.Lower.ult(L))
+ L = CR.Lower;
return ConstantRange(L, U);
}
/// correspond to the possible range of values as if the source range had been
/// zero extended.
ConstantRange ConstantRange::zeroExtend(uint32_t DstTySize) const {
+ if (isEmptySet()) return ConstantRange(DstTySize, /*isFullSet=*/false);
+
unsigned SrcTySize = getBitWidth();
assert(SrcTySize < DstTySize && "Not a value extension");
- if (isFullSet())
- // Change a source full set into [0, 1 << 8*numbytes)
+ if (isFullSet() || isWrappedSet())
+ // 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
/// correspond to the possible range of values as if the source range had been
/// sign extended.
ConstantRange ConstantRange::signExtend(uint32_t DstTySize) const {
+ if (isEmptySet()) return ConstantRange(DstTySize, /*isFullSet=*/false);
+
unsigned SrcTySize = getBitWidth();
assert(SrcTySize < DstTySize && "Not a value extension");
- if (isFullSet()) {
+ if (isFullSet() || isSignWrappedSet()) {
return ConstantRange(APInt::getHighBitsSet(DstTySize,DstTySize-SrcTySize+1),
- APInt::getLowBitsSet(DstTySize, SrcTySize-1));
+ 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
assert(SrcTySize > DstTySize && "Not a value truncation");
APInt Size(APInt::getLowBitsSet(SrcTySize, DstTySize));
if (isFullSet() || getSetSize().ugt(Size))
- return ConstantRange(DstTySize);
+ 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
+/// value is zero extended, truncated, or left alone to make it that width.
+ConstantRange ConstantRange::zextOrTrunc(uint32_t DstTySize) const {
+ unsigned SrcTySize = getBitWidth();
+ if (SrcTySize > DstTySize)
+ return truncate(DstTySize);
+ else if (SrcTySize < DstTySize)
+ return zeroExtend(DstTySize);
+ else
+ return *this;
+}
+
+/// sextOrTrunc - make this range have the bit width given by \p DstTySize. The
+/// value is sign extended, truncated, or left alone to make it that width.
+ConstantRange ConstantRange::sextOrTrunc(uint32_t DstTySize) const {
+ unsigned SrcTySize = getBitWidth();
+ if (SrcTySize > DstTySize)
+ return truncate(DstTySize);
+ else if (SrcTySize < DstTySize)
+ return signExtend(DstTySize);
+ else
+ return *this;
}
ConstantRange
ConstantRange::add(const ConstantRange &Other) const {
if (isEmptySet() || Other.isEmptySet())
return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+ if (isFullSet() || Other.isFullSet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
APInt Spread_X = getSetSize(), Spread_Y = Other.getSetSize();
APInt NewLower = getLower() + Other.getLower();
return X;
}
+ConstantRange
+ConstantRange::sub(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+ if (isFullSet() || Other.isFullSet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+
+ APInt Spread_X = getSetSize(), Spread_Y = Other.getSetSize();
+ APInt NewLower = getLower() - Other.getUpper() + 1;
+ APInt NewUpper = getUpper() - Other.getLower();
+ if (NewLower == NewUpper)
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+
+ ConstantRange X = ConstantRange(NewLower, NewUpper);
+ if (X.getSetSize().ult(Spread_X) || X.getSetSize().ult(Spread_Y))
+ // We've wrapped, therefore, full set.
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+
+ return X;
+}
+
ConstantRange
ConstantRange::multiply(const ConstantRange &Other) const {
- // TODO: Implement multiply.
- return ConstantRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
+ // TODO: If either operand is a single element and the multiply is known to
+ // be non-wrapping, round the result min and max value to the appropriate
+ // multiple of that element. If wrapping is possible, at least adjust the
+ // range according to the greatest power-of-two factor of the single element.
+
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+ if (isFullSet() || Other.isFullSet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+
+ APInt this_min = getUnsignedMin().zext(getBitWidth() * 2);
+ APInt this_max = getUnsignedMax().zext(getBitWidth() * 2);
+ APInt Other_min = Other.getUnsignedMin().zext(getBitWidth() * 2);
+ APInt Other_max = Other.getUnsignedMax().zext(getBitWidth() * 2);
+
+ ConstantRange Result_zext = ConstantRange(this_min * Other_min,
+ this_max * Other_max + 1);
+ return Result_zext.truncate(getBitWidth());
}
ConstantRange
ConstantRange::smax(const ConstantRange &Other) const {
- // TODO: Implement smax.
- return ConstantRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
+ // X smax Y is: range(smax(X_smin, Y_smin),
+ // smax(X_smax, Y_smax))
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+ APInt NewL = APIntOps::smax(getSignedMin(), Other.getSignedMin());
+ APInt NewU = APIntOps::smax(getSignedMax(), Other.getSignedMax()) + 1;
+ if (NewU == NewL)
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+ return ConstantRange(NewL, NewU);
}
ConstantRange
// umax(X_umax, Y_umax))
if (isEmptySet() || Other.isEmptySet())
return ConstantRange(getBitWidth(), /*isFullSet=*/false);
- if (isFullSet() || Other.isFullSet())
- return ConstantRange(getBitWidth(), /*isFullSet=*/true);
APInt NewL = APIntOps::umax(getUnsignedMin(), Other.getUnsignedMin());
APInt NewU = APIntOps::umax(getUnsignedMax(), Other.getUnsignedMax()) + 1;
if (NewU == NewL)
}
ConstantRange
-ConstantRange::udiv(const ConstantRange &Other) const {
- // TODO: Implement udiv.
- return ConstantRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
-}
-
-/// Initialize a full (the default) or empty set for the specified type.
-///
-ConstantSignedRange::ConstantSignedRange(uint32_t BitWidth, bool Full) :
- ConstantRangeBase(APInt(BitWidth, 0), APInt(BitWidth, 0)) {
- if (Full)
- Lower = Upper = APInt::getSignedMaxValue(BitWidth);
- else
- Lower = Upper = APInt::getSignedMinValue(BitWidth);
-}
-
-/// Initialize a range to hold the single specified value.
-///
-ConstantSignedRange::ConstantSignedRange(const APInt & V)
- : ConstantRangeBase(V) {}
-
-ConstantSignedRange::ConstantSignedRange(const APInt &L, const APInt &U)
- : ConstantRangeBase(L, U) {
- assert((L != U || (L.isMaxSignedValue() || L.isMinSignedValue())) &&
- "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 ConstantSignedRange::isFullSet() const {
- return Lower == Upper && Lower.isMaxSignedValue();
-}
-
-/// isEmptySet - Return true if this set contains no members.
-///
-bool ConstantSignedRange::isEmptySet() const {
- return Lower == Upper && Lower.isMinSignedValue();
-}
-
-/// isWrappedSet - Return true if this set wraps around the top of the range,
-/// for example: [100, 8)
-///
-bool ConstantSignedRange::isWrappedSet() const {
- return Lower.sgt(Upper);
-}
-
-/// getSetSize - Return the number of elements in this set.
-///
-APInt ConstantSignedRange::getSetSize() const {
- if (isEmptySet())
- return APInt(getBitWidth(), 0);
- if (getBitWidth() == 1) {
- if (Lower != Upper) // One of T or F in the set...
- return APInt(2, 1);
- return APInt(2, 2); // Must be full set...
- }
-
- // Simply subtract the bounds...
- return Upper - Lower;
-}
-
-/// getSignedMax - Return the largest signed value contained in the
-/// ConstantSignedRange.
-///
-APInt ConstantSignedRange::getSignedMax() const {
- if (isFullSet() || isWrappedSet())
- return APInt::getSignedMaxValue(getBitWidth());
- else
- return getUpper() - 1;
-}
+ConstantRange::udiv(const ConstantRange &RHS) const {
+ if (isEmptySet() || RHS.isEmptySet() || RHS.getUnsignedMax() == 0)
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+ if (RHS.isFullSet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
-/// getSignedMin - Return the smallest signed value contained in the
-/// ConstantSignedRange.
-///
-APInt ConstantSignedRange::getSignedMin() const {
- if (isFullSet() || (isWrappedSet() &&
- getUpper() != APInt::getSignedMinValue(getBitWidth())))
- return APInt::getSignedMinValue(getBitWidth());
- else
- return getLower();
-}
+ APInt Lower = getUnsignedMin().udiv(RHS.getUnsignedMax());
-/// getUnsignedMax - Return the largest unsigned value contained in the
-/// ConstantSignedRange.
-///
-APInt ConstantSignedRange::getUnsignedMax() const {
- APInt UnsignedMax(APInt::getMaxValue(getBitWidth()));
- if (!isWrappedSet()) {
- if (getLower().ule(getUpper() - 1))
- return getUpper() - 1;
+ APInt RHS_umin = RHS.getUnsignedMin();
+ if (RHS_umin == 0) {
+ // We want the lowest value in RHS excluding zero. Usually that would be 1
+ // except for a range in the form of [X, 1) in which case it would be X.
+ if (RHS.getUpper() == 1)
+ RHS_umin = RHS.getLower();
else
- return UnsignedMax;
- } else {
- if ((getUpper() - 1).ult(getLower())) {
- if (getLower() != UnsignedMax)
- return UnsignedMax;
- else
- return getUpper() - 1;
- } else {
- return getUpper() - 1;
- }
+ RHS_umin = APInt(getBitWidth(), 1);
}
-}
-/// getUnsignedMin - Return the smallest unsigned value contained in the
-/// ConstantSignedRange.
-///
-APInt ConstantSignedRange::getUnsignedMin() const {
- APInt UnsignedMin(APInt::getMinValue(getBitWidth()));
- if (!isWrappedSet()) {
- if (getLower().ule(getUpper() - 1))
- return getLower();
- else
- return UnsignedMin;
- } else {
- if ((getUpper() - 1).ult(getLower())) {
- if (getUpper() != UnsignedMin)
- return UnsignedMin;
- else
- return getLower();
- } else {
- return getLower();
- }
- }
-}
+ APInt Upper = getUnsignedMax().udiv(RHS_umin) + 1;
-/// contains - Return true if the specified value is in the set.
-///
-bool ConstantSignedRange::contains(const APInt &V) const {
+ // If the LHS is Full and the RHS is a wrapped interval containing 1 then
+ // this could occur.
if (Lower == Upper)
- return isFullSet();
-
- if (!isWrappedSet())
- return Lower.sle(V) && V.slt(Upper);
- else
- return Lower.sle(V) || V.slt(Upper);
-}
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
-/// subtract - Subtract the specified constant from the endpoints of this
-/// constant range.
-ConstantSignedRange ConstantSignedRange::subtract(const APInt &Val) const {
- assert(Val.getBitWidth() == getBitWidth() && "Wrong bit width");
- // If the set is empty or full, don't modify the endpoints.
- if (Lower == Upper)
- return *this;
- return ConstantSignedRange(Lower - Val, Upper - Val);
+ return ConstantRange(Lower, Upper);
}
+ConstantRange
+ConstantRange::binaryAnd(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
-// intersect1Wrapped - This helper function is used to intersect two ranges when
-// it is known that LHS is wrapped and RHS isn't.
-//
-ConstantSignedRange
-ConstantSignedRange::intersect1Wrapped(const ConstantSignedRange &LHS,
- const ConstantSignedRange &RHS) {
- assert(LHS.isWrappedSet() && !RHS.isWrappedSet());
-
- // Check to see if we overlap on the Left side of RHS...
- //
- if (RHS.Lower.slt(LHS.Upper)) {
- // We do overlap on the left side of RHS, see if we overlap on the right of
- // RHS...
- if (RHS.Upper.sgt(LHS.Lower)) {
- // Ok, the result overlaps on both the left and right sides. See if the
- // resultant interval will be smaller if we wrap or not...
- //
- if (LHS.getSetSize().ult(RHS.getSetSize()))
- return LHS;
- else
- return RHS;
+ // TODO: replace this with something less conservative
- } else {
- // No overlap on the right, just on the left.
- return ConstantSignedRange(RHS.Lower, LHS.Upper);
- }
- } else {
- // We don't overlap on the left side of RHS, see if we overlap on the right
- // of RHS...
- if (RHS.Upper.sgt(LHS.Lower)) {
- // Simple overlap...
- return ConstantSignedRange(LHS.Lower, RHS.Upper);
- } else {
- // No overlap...
- return ConstantSignedRange(LHS.getBitWidth(), false);
- }
- }
+ APInt umin = APIntOps::umin(Other.getUnsignedMax(), getUnsignedMax());
+ if (umin.isAllOnesValue())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+ return ConstantRange(APInt::getNullValue(getBitWidth()), umin + 1);
}
-/// intersectWith - Return the range that results from the intersection of this
-/// range with another range.
-///
-ConstantSignedRange
-ConstantSignedRange::intersectWith(const ConstantSignedRange &CR) const {
- assert(getBitWidth() == CR.getBitWidth() &&
- "ConstantSignedRange types don't agree!");
- // Handle common special cases
- if (isEmptySet() || CR.isFullSet())
- return *this;
- if (isFullSet() || CR.isEmptySet())
- return CR;
+ConstantRange
+ConstantRange::binaryOr(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
- if (!isWrappedSet()) {
- if (!CR.isWrappedSet()) {
- APInt L = APIntOps::smax(Lower, CR.Lower);
- APInt U = APIntOps::smin(Upper, CR.Upper);
+ // TODO: replace this with something less conservative
- if (L.slt(U)) // If range isn't empty...
- return ConstantSignedRange(L, U);
- else
- return ConstantSignedRange(getBitWidth(), false);// Otherwise, empty set
- } else
- return intersect1Wrapped(CR, *this);
- } else { // We know "this" is wrapped...
- if (!CR.isWrappedSet())
- return intersect1Wrapped(*this, CR);
- else {
- // Both ranges are wrapped...
- APInt L = APIntOps::smax(Lower, CR.Lower);
- APInt U = APIntOps::smin(Upper, CR.Upper);
- return ConstantSignedRange(L, U);
- }
- }
- return *this;
+ APInt umax = APIntOps::umax(getUnsignedMin(), Other.getUnsignedMin());
+ if (umax.isMinValue())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+ return ConstantRange(umax, APInt::getNullValue(getBitWidth()));
}
-/// 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).
-ConstantSignedRange
-ConstantSignedRange::maximalIntersectWith(const ConstantSignedRange &CR) const {
- assert(getBitWidth() == CR.getBitWidth() &&
- "ConstantSignedRange 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.slt(CR.Lower)) {
- if (Upper.sle(CR.Lower))
- return ConstantSignedRange(getBitWidth(), false);
-
- if (Upper.slt(CR.Upper))
- return ConstantSignedRange(CR.Lower, Upper);
-
- return CR;
- } else {
- if (Upper.slt(CR.Upper))
- return *this;
-
- if (Lower.slt(CR.Upper))
- return ConstantSignedRange(Lower, CR.Upper);
-
- return ConstantSignedRange(getBitWidth(), false);
- }
- }
-
- if (isWrappedSet() && !CR.isWrappedSet()) {
- if (CR.Lower.slt(Upper)) {
- if (CR.Upper.slt(Upper))
- return CR;
-
- if (CR.Upper.slt(Lower))
- return ConstantSignedRange(CR.Lower, Upper);
-
- if (getSetSize().ult(CR.getSetSize()))
- return *this;
- else
- return CR;
- } else if (CR.Lower.slt(Lower)) {
- if (CR.Upper.sle(Lower))
- return ConstantSignedRange(getBitWidth(), false);
-
- return ConstantSignedRange(Lower, CR.Upper);
- }
- return CR;
- }
-
- if (CR.Upper.slt(Upper)) {
- if (CR.Lower.slt(Upper)) {
- if (getSetSize().ult(CR.getSetSize()))
- return *this;
- else
- return CR;
- }
+ConstantRange
+ConstantRange::shl(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
- if (CR.Lower.slt(Lower))
- return ConstantSignedRange(Lower, CR.Upper);
+ APInt min = getUnsignedMin().shl(Other.getUnsignedMin());
+ APInt max = getUnsignedMax().shl(Other.getUnsignedMax());
- return CR;
- } else if (CR.Upper.slt(Lower)) {
- if (CR.Lower.slt(Lower))
- return *this;
+ // there's no overflow!
+ APInt Zeros(getBitWidth(), getUnsignedMax().countLeadingZeros());
+ if (Zeros.ugt(Other.getUnsignedMax()))
+ return ConstantRange(min, max + 1);
- return ConstantSignedRange(CR.Lower, Upper);
- }
- if (getSetSize().ult(CR.getSetSize()))
- return *this;
- else
- return CR;
+ // FIXME: implement the other tricky cases
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
}
+ConstantRange
+ConstantRange::lshr(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+
+ APInt max = getUnsignedMax().lshr(Other.getUnsignedMin());
+ APInt min = getUnsignedMin().lshr(Other.getUnsignedMax());
+ if (min == max + 1)
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
-/// 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.
-///
-ConstantSignedRange
-ConstantSignedRange::unionWith(const ConstantSignedRange &CR) const {
- assert(getBitWidth() == CR.getBitWidth() &&
- "ConstantSignedRange types don't agree!");
-
- 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 (!isWrappedSet() && !CR.isWrappedSet()) {
- if (CR.Lower.slt(L))
- L = CR.Lower;
-
- if (CR.Upper.sgt(U))
- U = CR.Upper;
- }
-
- if (isWrappedSet() && !CR.isWrappedSet()) {
- if ((CR.Lower.slt(Upper) && CR.Upper.slt(Upper)) ||
- (CR.Lower.sgt(Lower) && CR.Upper.sgt(Lower))) {
- return *this;
- }
-
- if (CR.Lower.sle(Upper) && Lower.sle(CR.Upper)) {
- return ConstantSignedRange(getBitWidth());
- }
-
- if (CR.Lower.sle(Upper) && CR.Upper.sle(Lower)) {
- APInt d1 = CR.Upper - Upper, d2 = Lower - CR.Upper;
- if (d1.slt(d2)) {
- U = CR.Upper;
- } else {
- L = CR.Upper;
- }
- }
-
- if (Upper.slt(CR.Lower) && CR.Upper.slt(Lower)) {
- APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Upper;
- if (d1.slt(d2)) {
- U = CR.Lower + 1;
- } else {
- L = CR.Upper - 1;
- }
- }
-
- if (Upper.slt(CR.Lower) && Lower.slt(CR.Upper)) {
- APInt d1 = CR.Lower - Upper, d2 = Lower - CR.Lower;
-
- if (d1.slt(d2)) {
- U = CR.Lower + 1;
- } else {
- L = CR.Lower;
- }
- }
- }
-
- if (isWrappedSet() && CR.isWrappedSet()) {
- if (Lower.slt(CR.Upper) || CR.Lower.slt(Upper))
- return ConstantSignedRange(getBitWidth());
-
- if (CR.Upper.sgt(U)) {
- U = CR.Upper;
- }
-
- if (CR.Lower.slt(L)) {
- L = CR.Lower;
- }
-
- if (L == U) return ConstantSignedRange(getBitWidth());
- }
-
- return ConstantSignedRange(L, U);
+ return ConstantRange(min, max + 1);
}
-/// zeroExtend - 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
-/// zero extended.
-ConstantSignedRange ConstantSignedRange::zeroExtend(uint32_t DstTySize) const {
- unsigned SrcTySize = getBitWidth();
- assert(SrcTySize < DstTySize && "Not a value extension");
- if (isEmptySet())
- return ConstantSignedRange(SrcTySize, /*isFullSet=*/false);
- if (isFullSet())
- // Change a source full set into [0, 1 << 8*numbytes)
- return ConstantSignedRange(APInt(DstTySize,0),
- APInt(DstTySize,1).shl(SrcTySize));
-
- APInt L, U;
- if (Lower.isNegative() && !Upper.isNegative()) {
- L = APInt(SrcTySize, 0);
- U = APInt::getSignedMinValue(SrcTySize);
- } else {
- L = Lower;
- U = Upper;
+ConstantRange ConstantRange::inverse() const {
+ if (isFullSet()) {
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+ } else if (isEmptySet()) {
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
}
- L.zext(DstTySize);
- U.zext(DstTySize);
- return ConstantSignedRange(L, U);
+ return ConstantRange(Upper, Lower);
}
-/// 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.
-ConstantSignedRange ConstantSignedRange::signExtend(uint32_t DstTySize) const {
- unsigned SrcTySize = getBitWidth();
- assert(SrcTySize < DstTySize && "Not a value extension");
- if (isEmptySet())
- return ConstantSignedRange(SrcTySize, /*isFullSet=*/false);
+/// print - Print out the bounds to a stream...
+///
+void ConstantRange::print(raw_ostream &OS) const {
if (isFullSet())
- return ConstantSignedRange(APInt(getSignedMin()).sext(DstTySize),
- APInt(getSignedMax()).sext(DstTySize)+1);
-
- APInt L = Lower; L.sext(DstTySize);
- APInt U = Upper; U.sext(DstTySize);
- return ConstantSignedRange(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
-/// truncated to the specified type.
-ConstantSignedRange ConstantSignedRange::truncate(uint32_t DstTySize) const {
- // TODO: Implement truncate.
- return ConstantSignedRange(DstTySize, !isEmptySet());
-}
-
-ConstantSignedRange
-ConstantSignedRange::add(const ConstantSignedRange &Other) const {
- // TODO: Implement add.
- return ConstantSignedRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
-}
-
-ConstantSignedRange
-ConstantSignedRange::multiply(const ConstantSignedRange &Other) const {
- // TODO: Implement multiply.
- return ConstantSignedRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
-}
-
-ConstantSignedRange
-ConstantSignedRange::smax(const ConstantSignedRange &Other) const {
- // X smax Y is: range(smax(X_smin, Y_smin),
- // smax(X_smax, Y_smax))
- if (isEmptySet() || Other.isEmptySet())
- return ConstantSignedRange(getBitWidth(), /*isFullSet=*/false);
- if (isFullSet() || Other.isFullSet())
- return ConstantSignedRange(getBitWidth(), /*isFullSet=*/true);
- APInt NewL = APIntOps::smax(getSignedMin(), Other.getSignedMin());
- APInt NewU = APIntOps::smax(getSignedMax(), Other.getSignedMax()) + 1;
- if (NewU == NewL)
- return ConstantSignedRange(getBitWidth(), /*isFullSet=*/true);
- return ConstantSignedRange(NewL, NewU);
-}
-
-ConstantSignedRange
-ConstantSignedRange::umax(const ConstantSignedRange &Other) const {
- // TODO: Implement umax.
- return ConstantSignedRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
+ OS << "full-set";
+ else if (isEmptySet())
+ OS << "empty-set";
+ else
+ OS << "[" << Lower << "," << Upper << ")";
}
-ConstantSignedRange
-ConstantSignedRange::udiv(const ConstantSignedRange &Other) const {
- // TODO: Implement udiv.
- return ConstantSignedRange(getBitWidth(),
- !(isEmptySet() || Other.isEmptySet()));
+/// dump - Allow printing from a debugger easily...
+///
+void ConstantRange::dump() const {
+ print(dbgs());
}
projects / oota-llvm.git / blobdiff