#define LLVM_ADT_SMALLBITVECTOR_H
#include "llvm/ADT/BitVector.h"
+#include "llvm/Support/Compiler.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
SmallNumDataBits = SmallNumRawBits - SmallNumSizeBits
};
+ static_assert(NumBaseBits == 64 || NumBaseBits == 32,
+ "Unsupported word size");
+
+public:
+ typedef unsigned size_type;
+ // Encapsulation of a single bit.
+ class reference {
+ SmallBitVector &TheVector;
+ unsigned BitPos;
+
+ public:
+ reference(SmallBitVector &b, unsigned Idx) : TheVector(b), BitPos(Idx) {}
+
+ reference& operator=(reference t) {
+ *this = bool(t);
+ return *this;
+ }
+
+ reference& operator=(bool t) {
+ if (t)
+ TheVector.set(BitPos);
+ else
+ TheVector.reset(BitPos);
+ return *this;
+ }
+
+ operator bool() const {
+ return const_cast<const SmallBitVector &>(TheVector).operator[](BitPos);
+ }
+ };
+
+private:
bool isSmall() const {
return X & uintptr_t(1);
}
void setSmallRawBits(uintptr_t NewRawBits) {
assert(isSmall());
- X = NewRawBits << 1 | uintptr_t(1);
+ X = (NewRawBits << 1) | uintptr_t(1);
}
// Return the size.
}
void setSmallBits(uintptr_t NewBits) {
- setSmallRawBits(NewBits & ~(~uintptr_t(0) << getSmallSize()) |
+ setSmallRawBits((NewBits & ~(~uintptr_t(0) << getSmallSize())) |
(getSmallSize() << SmallNumDataBits));
}
switchToLarge(new BitVector(*RHS.getPointer()));
}
+ SmallBitVector(SmallBitVector &&RHS) : X(RHS.X) {
+ RHS.X = 1;
+ }
+
~SmallBitVector() {
if (!isSmall())
delete getPointer();
}
/// count - Returns the number of bits which are set.
- unsigned count() const {
+ size_type count() const {
if (isSmall()) {
uintptr_t Bits = getSmallBits();
- if (sizeof(uintptr_t) * CHAR_BIT == 32)
- return CountPopulation_32(Bits);
- if (sizeof(uintptr_t) * CHAR_BIT == 64)
- return CountPopulation_64(Bits);
- assert(0 && "Unsupported!");
+ return countPopulation(Bits);
}
return getPointer()->count();
}
return getPointer()->any();
}
+ /// all - Returns true if all bits are set.
+ bool all() const {
+ if (isSmall())
+ return getSmallBits() == (uintptr_t(1) << getSmallSize()) - 1;
+ return getPointer()->all();
+ }
+
/// none - Returns true if none of the bits are set.
bool none() const {
if (isSmall())
int find_first() const {
if (isSmall()) {
uintptr_t Bits = getSmallBits();
- if (sizeof(uintptr_t) * CHAR_BIT == 32) {
- size_t FirstBit = CountTrailingZeros_32(Bits);
- return FirstBit == 32 ? -1 : FirstBit;
- } else if (sizeof(uintptr_t) * CHAR_BIT == 64) {
- size_t FirstBit = CountTrailingZeros_64(Bits);
- return FirstBit == 64 ? -1 : FirstBit;
- }
- assert(0 && "Unsupported!");
+ if (Bits == 0)
+ return -1;
+ return countTrailingZeros(Bits);
}
return getPointer()->find_first();
}
uintptr_t Bits = getSmallBits();
// Mask off previous bits.
Bits &= ~uintptr_t(0) << (Prev + 1);
- if (sizeof(uintptr_t) * CHAR_BIT == 32) {
- size_t FirstBit = CountTrailingZeros_32(Bits);
- return FirstBit == 32 ? -1 : FirstBit;
- } else if (sizeof(uintptr_t) * CHAR_BIT == 64) {
- size_t FirstBit = CountTrailingZeros_64(Bits);
- return FirstBit == 64 ? -1 : FirstBit;
- }
- assert(0 && "Unsupported!");
+ if (Bits == 0 || Prev + 1 >= getSmallSize())
+ return -1;
+ return countTrailingZeros(Bits);
}
return getPointer()->find_next(Prev);
}
}
SmallBitVector &set(unsigned Idx) {
- if (isSmall())
+ if (isSmall()) {
+ assert(Idx <= static_cast<unsigned>(
+ std::numeric_limits<uintptr_t>::digits) &&
+ "undefined behavior");
setSmallBits(getSmallBits() | (uintptr_t(1) << Idx));
+ }
else
getPointer()->set(Idx);
return *this;
}
+ /// set - Efficiently set a range of bits in [I, E)
+ SmallBitVector &set(unsigned I, unsigned E) {
+ assert(I <= E && "Attempted to set backwards range!");
+ assert(E <= size() && "Attempted to set out-of-bounds range!");
+ if (I == E) return *this;
+ if (isSmall()) {
+ uintptr_t EMask = ((uintptr_t)1) << E;
+ uintptr_t IMask = ((uintptr_t)1) << I;
+ uintptr_t Mask = EMask - IMask;
+ setSmallBits(getSmallBits() | Mask);
+ } else
+ getPointer()->set(I, E);
+ return *this;
+ }
+
SmallBitVector &reset() {
if (isSmall())
setSmallBits(0);
return *this;
}
+ /// reset - Efficiently reset a range of bits in [I, E)
+ SmallBitVector &reset(unsigned I, unsigned E) {
+ assert(I <= E && "Attempted to reset backwards range!");
+ assert(E <= size() && "Attempted to reset out-of-bounds range!");
+ if (I == E) return *this;
+ if (isSmall()) {
+ uintptr_t EMask = ((uintptr_t)1) << E;
+ uintptr_t IMask = ((uintptr_t)1) << I;
+ uintptr_t Mask = EMask - IMask;
+ setSmallBits(getSmallBits() & ~Mask);
+ } else
+ getPointer()->reset(I, E);
+ return *this;
+ }
+
SmallBitVector &flip() {
if (isSmall())
setSmallBits(~getSmallBits());
}
// Indexing.
- // TODO: Add an index operator which returns a "reference" (proxy class).
+ reference operator[](unsigned Idx) {
+ assert(Idx < size() && "Out-of-bounds Bit access.");
+ return reference(*this, Idx);
+ }
+
bool operator[](unsigned Idx) const {
assert(Idx < size() && "Out-of-bounds Bit access.");
if (isSmall())
return (*this)[Idx];
}
+ /// Test if any common bits are set.
+ bool anyCommon(const SmallBitVector &RHS) const {
+ if (isSmall() && RHS.isSmall())
+ return (getSmallBits() & RHS.getSmallBits()) != 0;
+ if (!isSmall() && !RHS.isSmall())
+ return getPointer()->anyCommon(*RHS.getPointer());
+
+ for (unsigned i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
+ if (test(i) && RHS.test(i))
+ return true;
+ return false;
+ }
+
// Comparison operators.
bool operator==(const SmallBitVector &RHS) const {
if (size() != RHS.size())
return *this;
}
+ /// reset - Reset bits that are set in RHS. Same as *this &= ~RHS.
+ SmallBitVector &reset(const SmallBitVector &RHS) {
+ if (isSmall() && RHS.isSmall())
+ setSmallBits(getSmallBits() & ~RHS.getSmallBits());
+ else if (!isSmall() && !RHS.isSmall())
+ getPointer()->reset(*RHS.getPointer());
+ else
+ for (unsigned i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
+ if (RHS.test(i))
+ reset(i);
+
+ return *this;
+ }
+
+ /// test - Check if (This - RHS) is zero.
+ /// This is the same as reset(RHS) and any().
+ bool test(const SmallBitVector &RHS) const {
+ if (isSmall() && RHS.isSmall())
+ return (getSmallBits() & ~RHS.getSmallBits()) != 0;
+ if (!isSmall() && !RHS.isSmall())
+ return getPointer()->test(*RHS.getPointer());
+
+ unsigned i, e;
+ for (i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
+ if (test(i) && !RHS.test(i))
+ return true;
+
+ for (e = size(); i != e; ++i)
+ if (test(i))
+ return true;
+
+ return false;
+ }
+
SmallBitVector &operator|=(const SmallBitVector &RHS) {
resize(std::max(size(), RHS.size()));
if (isSmall())
return *this;
}
+ const SmallBitVector &operator=(SmallBitVector &&RHS) {
+ if (this != &RHS) {
+ clear();
+ swap(RHS);
+ }
+ return *this;
+ }
+
void swap(SmallBitVector &RHS) {
std::swap(X, RHS.X);
}
+
+ /// setBitsInMask - Add '1' bits from Mask to this vector. Don't resize.
+ /// This computes "*this |= Mask".
+ void setBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ if (isSmall())
+ applyMask<true, false>(Mask, MaskWords);
+ else
+ getPointer()->setBitsInMask(Mask, MaskWords);
+ }
+
+ /// clearBitsInMask - Clear any bits in this vector that are set in Mask.
+ /// Don't resize. This computes "*this &= ~Mask".
+ void clearBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ if (isSmall())
+ applyMask<false, false>(Mask, MaskWords);
+ else
+ getPointer()->clearBitsInMask(Mask, MaskWords);
+ }
+
+ /// setBitsNotInMask - Add a bit to this vector for every '0' bit in Mask.
+ /// Don't resize. This computes "*this |= ~Mask".
+ void setBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ if (isSmall())
+ applyMask<true, true>(Mask, MaskWords);
+ else
+ getPointer()->setBitsNotInMask(Mask, MaskWords);
+ }
+
+ /// clearBitsNotInMask - Clear a bit in this vector for every '0' bit in Mask.
+ /// Don't resize. This computes "*this &= Mask".
+ void clearBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ if (isSmall())
+ applyMask<false, true>(Mask, MaskWords);
+ else
+ getPointer()->clearBitsNotInMask(Mask, MaskWords);
+ }
+
+private:
+ template<bool AddBits, bool InvertMask>
+ void applyMask(const uint32_t *Mask, unsigned MaskWords) {
+ if (NumBaseBits == 64 && MaskWords >= 2) {
+ uint64_t M = Mask[0] | (uint64_t(Mask[1]) << 32);
+ if (InvertMask) M = ~M;
+ if (AddBits) setSmallBits(getSmallBits() | M);
+ else setSmallBits(getSmallBits() & ~M);
+ } else {
+ uint32_t M = Mask[0];
+ if (InvertMask) M = ~M;
+ if (AddBits) setSmallBits(getSmallBits() | M);
+ else setSmallBits(getSmallBits() & ~M);
+ }
+ }
};
inline SmallBitVector
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