/// contains - Return true if the specified value is in the set.
///
bool ConstantRange::contains(const APInt &V) const {
if (Lower == Upper)
return isFullSet();
if (!isWrappedSet())
return Lower.ule(V) && V.ult(Upper);
return Lower.ule(V) || V.ult(Upper);
}
/// intersectWith - Return the range that results from the intersection of this
/// range with another range.
///
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()) {
using namespace APIntOps;
APInt L = umax(Lower, CR.Lower);
APInt U = 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...
using namespace APIntOps;
APInt L = umax(Lower, CR.Lower);
APInt U = umin(Upper, CR.Upper);
return ConstantRange(L, U);
}
}
return *this;
}
/// 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.
ConstantRange ConstantRange::truncate(uint32_t DstTySize) const {
assert(getBitWidth() > DstTySize && "Not a value truncation");
if (isEmptySet())
return ConstantRange(DstTySize, /*isFullSet=*/false);
if (isFullSet())
return ConstantRange(DstTySize, /*isFullSet=*/true);
APInt MaxValue = APInt::getMaxValue(DstTySize).zext(getBitWidth());
APInt MaxBitValue(getBitWidth(), 0);
MaxBitValue.setBit(DstTySize);
APInt LowerDiv(Lower), UpperDiv(Upper);
ConstantRange Union(DstTySize, /*isFullSet=*/false);
// Analyze wrapped sets in their two parts: [0, Upper) \/ [Lower, MaxValue]
// We use the non-wrapped set code to analyze the [Lower, MaxValue) part, and
// then we do the union with [MaxValue, Upper)
if (isWrappedSet()) {
// if Upper is greater than Max Value, it covers the whole truncated range.
if (Upper.uge(MaxValue))
return ConstantRange(DstTySize, /*isFullSet=*/true);
Union = ConstantRange(APInt::getMaxValue(DstTySize),Upper.trunc(DstTySize));
UpperDiv = APInt::getMaxValue(getBitWidth());
// Union covers the MaxValue case, so return if the remaining range is just
// MaxValue.
if (LowerDiv == UpperDiv)
return Union;
}
// Chop off the most significant bits that are past the destination bitwidth.
if (LowerDiv.uge(MaxValue)) {
APInt Div(getBitWidth(), 0);
APInt::udivrem(LowerDiv, MaxBitValue, Div, LowerDiv);
UpperDiv = UpperDiv - MaxBitValue * Div;
}
if (UpperDiv.ule(MaxValue))
return ConstantRange(LowerDiv.trunc(DstTySize),
UpperDiv.trunc(DstTySize)).unionWith(Union);
// The truncated value wrapps around. Check if we can do better than fullset.
APInt UpperModulo = UpperDiv - MaxBitValue;
if (UpperModulo.ult(LowerDiv))
return ConstantRange(LowerDiv.trunc(DstTySize),
UpperModulo.trunc(DstTySize)).unionWith(Union);
return ConstantRange(DstTySize, /*isFullSet=*/true);
}
/// \brief Compute the size of the object pointed by Ptr. Returns true and the
/// object size in Size if successful, and false otherwise.
/// If RoundToAlign is true, then Size is rounded up to the aligment of allocas,
/// byval arguments, and global variables.
bool llvm::getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout &DL,
const TargetLibraryInfo *TLI, bool RoundToAlign) {
ObjectSizeOffsetVisitor Visitor(DL, TLI, Ptr->getContext(), RoundToAlign);
SizeOffsetType Data = Visitor.compute(const_cast<Value*>(Ptr));
if (!Visitor.bothKnown(Data))
return false;
APInt ObjSize = Data.first, Offset = Data.second;
// check for overflow
if (Offset.slt(0) || ObjSize.ult(Offset))
Size = 0;
else
Size = (ObjSize - Offset).getZExtValue();
return true;
}
/// FoldSPFofSPF - We have an SPF (e.g. a min or max) of an SPF of the form:
/// SPF2(SPF1(A, B), C)
Instruction *InstCombiner::FoldSPFofSPF(Instruction *Inner,
SelectPatternFlavor SPF1,
Value *A, Value *B,
Instruction &Outer,
SelectPatternFlavor SPF2, Value *C) {
if (C == A || C == B) {
// MAX(MAX(A, B), B) -> MAX(A, B)
// MIN(MIN(a, b), a) -> MIN(a, b)
if (SPF1 == SPF2)
return ReplaceInstUsesWith(Outer, Inner);
// MAX(MIN(a, b), a) -> a
// MIN(MAX(a, b), a) -> a
if ((SPF1 == SPF_SMIN && SPF2 == SPF_SMAX) ||
(SPF1 == SPF_SMAX && SPF2 == SPF_SMIN) ||
(SPF1 == SPF_UMIN && SPF2 == SPF_UMAX) ||
(SPF1 == SPF_UMAX && SPF2 == SPF_UMIN))
return ReplaceInstUsesWith(Outer, C);
}
if (SPF1 == SPF2) {
if (ConstantInt *CB = dyn_cast<ConstantInt>(B)) {
if (ConstantInt *CC = dyn_cast<ConstantInt>(C)) {
APInt ACB = CB->getValue();
APInt ACC = CC->getValue();
// MIN(MIN(A, 23), 97) -> MIN(A, 23)
// MAX(MAX(A, 97), 23) -> MAX(A, 97)
if ((SPF1 == SPF_UMIN && ACB.ule(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sle(ACC)) ||
(SPF1 == SPF_UMAX && ACB.uge(ACC)) ||
(SPF1 == SPF_SMAX && ACB.sge(ACC)))
return ReplaceInstUsesWith(Outer, Inner);
// MIN(MIN(A, 97), 23) -> MIN(A, 23)
// MAX(MAX(A, 23), 97) -> MAX(A, 97)
if ((SPF1 == SPF_UMIN && ACB.ugt(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sgt(ACC)) ||
(SPF1 == SPF_UMAX && ACB.ult(ACC)) ||
(SPF1 == SPF_SMAX && ACB.slt(ACC))) {
Outer.replaceUsesOfWith(Inner, A);
return &Outer;
}
}
}
}
return nullptr;
}
APInt swift::constantFoldComparison(APInt lhs, APInt rhs, BuiltinValueKind ID) {
bool result;
switch (ID) {
default: llvm_unreachable("Invalid integer compare kind");
case BuiltinValueKind::ICMP_EQ: result = lhs == rhs; break;
case BuiltinValueKind::ICMP_NE: result = lhs != rhs; break;
case BuiltinValueKind::ICMP_SLT: result = lhs.slt(rhs); break;
case BuiltinValueKind::ICMP_SGT: result = lhs.sgt(rhs); break;
case BuiltinValueKind::ICMP_SLE: result = lhs.sle(rhs); break;
case BuiltinValueKind::ICMP_SGE: result = lhs.sge(rhs); break;
case BuiltinValueKind::ICMP_ULT: result = lhs.ult(rhs); break;
case BuiltinValueKind::ICMP_UGT: result = lhs.ugt(rhs); break;
case BuiltinValueKind::ICMP_ULE: result = lhs.ule(rhs); break;
case BuiltinValueKind::ICMP_UGE: result = lhs.uge(rhs); break;
}
return APInt(1, result);
}
/// FoldSPFofSPF - We have an SPF (e.g. a min or max) of an SPF of the form:
/// SPF2(SPF1(A, B), C)
Instruction *InstCombiner::FoldSPFofSPF(Instruction *Inner,
SelectPatternFlavor SPF1,
Value *A, Value *B,
Instruction &Outer,
SelectPatternFlavor SPF2, Value *C) {
if (C == A || C == B) {
// MAX(MAX(A, B), B) -> MAX(A, B)
// MIN(MIN(a, b), a) -> MIN(a, b)
if (SPF1 == SPF2)
return ReplaceInstUsesWith(Outer, Inner);
// MAX(MIN(a, b), a) -> a
// MIN(MAX(a, b), a) -> a
if ((SPF1 == SPF_SMIN && SPF2 == SPF_SMAX) ||
(SPF1 == SPF_SMAX && SPF2 == SPF_SMIN) ||
(SPF1 == SPF_UMIN && SPF2 == SPF_UMAX) ||
(SPF1 == SPF_UMAX && SPF2 == SPF_UMIN))
return ReplaceInstUsesWith(Outer, C);
}
if (SPF1 == SPF2) {
if (ConstantInt *CB = dyn_cast<ConstantInt>(B)) {
if (ConstantInt *CC = dyn_cast<ConstantInt>(C)) {
APInt ACB = CB->getValue();
APInt ACC = CC->getValue();
// MIN(MIN(A, 23), 97) -> MIN(A, 23)
// MAX(MAX(A, 97), 23) -> MAX(A, 97)
if ((SPF1 == SPF_UMIN && ACB.ule(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sle(ACC)) ||
(SPF1 == SPF_UMAX && ACB.uge(ACC)) ||
(SPF1 == SPF_SMAX && ACB.sge(ACC)))
return ReplaceInstUsesWith(Outer, Inner);
// MIN(MIN(A, 97), 23) -> MIN(A, 23)
// MAX(MAX(A, 23), 97) -> MAX(A, 97)
if ((SPF1 == SPF_UMIN && ACB.ugt(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sgt(ACC)) ||
(SPF1 == SPF_UMAX && ACB.ult(ACC)) ||
(SPF1 == SPF_SMAX && ACB.slt(ACC))) {
Outer.replaceUsesOfWith(Inner, A);
return &Outer;
}
}
}
}
// ABS(ABS(X)) -> ABS(X)
// NABS(NABS(X)) -> NABS(X)
if (SPF1 == SPF2 && (SPF1 == SPF_ABS || SPF1 == SPF_NABS)) {
return ReplaceInstUsesWith(Outer, Inner);
}
// ABS(NABS(X)) -> ABS(X)
// NABS(ABS(X)) -> NABS(X)
if ((SPF1 == SPF_ABS && SPF2 == SPF_NABS) ||
(SPF1 == SPF_NABS && SPF2 == SPF_ABS)) {
SelectInst *SI = cast<SelectInst>(Inner);
Value *NewSI = Builder->CreateSelect(
SI->getCondition(), SI->getFalseValue(), SI->getTrueValue());
return ReplaceInstUsesWith(Outer, NewSI);
}
return nullptr;
}
