#ifndef LLVM_ADT_BITVECTOR_H
#define LLVM_ADT_BITVECTOR_H
+#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
unsigned Capacity; // Size of allocated memory in BitWord.
public:
+ typedef unsigned size_type;
// Encapsulation of a single bit.
class reference {
friend class BitVector;
reference& operator=(bool t) {
if (t)
- *WordRef |= 1L << BitPos;
+ *WordRef |= BitWord(1) << BitPos;
else
- *WordRef &= ~(1L << BitPos);
+ *WordRef &= ~(BitWord(1) << BitPos);
return *this;
}
operator bool() const {
- return ((*WordRef) & (1L << BitPos)) ? true : false;
+ return ((*WordRef) & (BitWord(1) << BitPos)) ? true : false;
}
};
/// BitVector default ctor - Creates an empty bitvector.
BitVector() : Size(0), Capacity(0) {
- Bits = 0;
+ Bits = nullptr;
}
/// BitVector ctor - Creates a bitvector of specified number of bits. All
/// BitVector copy ctor.
BitVector(const BitVector &RHS) : Size(RHS.size()) {
if (Size == 0) {
- Bits = 0;
+ Bits = nullptr;
Capacity = 0;
return;
}
std::memcpy(Bits, RHS.Bits, Capacity * sizeof(BitWord));
}
+ BitVector(BitVector &&RHS)
+ : Bits(RHS.Bits), Size(RHS.Size), Capacity(RHS.Capacity) {
+ RHS.Bits = nullptr;
+ }
+
~BitVector() {
std::free(Bits);
}
bool empty() const { return Size == 0; }
/// size - Returns the number of bits in this bitvector.
- unsigned size() const { return Size; }
+ size_type size() const { return Size; }
/// count - Returns the number of bits which are set.
- unsigned count() const {
+ size_type count() const {
unsigned NumBits = 0;
for (unsigned i = 0; i < NumBitWords(size()); ++i)
if (sizeof(BitWord) == 4)
/// all - Returns true if all bits are set.
bool all() const {
- // TODO: Optimize this.
- return count() == size();
+ for (unsigned i = 0; i < Size / BITWORD_SIZE; ++i)
+ if (Bits[i] != ~0UL)
+ return false;
+
+ // If bits remain check that they are ones. The unused bits are always zero.
+ if (unsigned Remainder = Size % BITWORD_SIZE)
+ return Bits[Size / BITWORD_SIZE] == (1UL << Remainder) - 1;
+
+ return true;
}
/// none - Returns true if none of the bits are set.
for (unsigned i = 0; i < NumBitWords(size()); ++i)
if (Bits[i] != 0) {
if (sizeof(BitWord) == 4)
- return i * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Bits[i]);
+ return i * BITWORD_SIZE + countTrailingZeros((uint32_t)Bits[i]);
if (sizeof(BitWord) == 8)
- return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]);
+ return i * BITWORD_SIZE + countTrailingZeros(Bits[i]);
llvm_unreachable("Unsupported!");
}
return -1;
unsigned BitPos = Prev % BITWORD_SIZE;
BitWord Copy = Bits[WordPos];
// Mask off previous bits.
- Copy &= ~0L << BitPos;
+ Copy &= ~0UL << BitPos;
if (Copy != 0) {
if (sizeof(BitWord) == 4)
- return WordPos * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Copy);
+ return WordPos * BITWORD_SIZE + countTrailingZeros((uint32_t)Copy);
if (sizeof(BitWord) == 8)
- return WordPos * BITWORD_SIZE + CountTrailingZeros_64(Copy);
+ return WordPos * BITWORD_SIZE + countTrailingZeros(Copy);
llvm_unreachable("Unsupported!");
}
for (unsigned i = WordPos+1; i < NumBitWords(size()); ++i)
if (Bits[i] != 0) {
if (sizeof(BitWord) == 4)
- return i * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Bits[i]);
+ return i * BITWORD_SIZE + countTrailingZeros((uint32_t)Bits[i]);
if (sizeof(BitWord) == 8)
- return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]);
+ return i * BITWORD_SIZE + countTrailingZeros(Bits[i]);
llvm_unreachable("Unsupported!");
}
return -1;
}
BitVector &set(unsigned Idx) {
- Bits[Idx / BITWORD_SIZE] |= 1L << (Idx % BITWORD_SIZE);
+ Bits[Idx / BITWORD_SIZE] |= BitWord(1) << (Idx % BITWORD_SIZE);
+ return *this;
+ }
+
+ /// set - Efficiently set a range of bits in [I, E)
+ BitVector &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 (I / BITWORD_SIZE == E / BITWORD_SIZE) {
+ BitWord EMask = 1UL << (E % BITWORD_SIZE);
+ BitWord IMask = 1UL << (I % BITWORD_SIZE);
+ BitWord Mask = EMask - IMask;
+ Bits[I / BITWORD_SIZE] |= Mask;
+ return *this;
+ }
+
+ BitWord PrefixMask = ~0UL << (I % BITWORD_SIZE);
+ Bits[I / BITWORD_SIZE] |= PrefixMask;
+ I = RoundUpToAlignment(I, BITWORD_SIZE);
+
+ for (; I + BITWORD_SIZE <= E; I += BITWORD_SIZE)
+ Bits[I / BITWORD_SIZE] = ~0UL;
+
+ BitWord PostfixMask = (1UL << (E % BITWORD_SIZE)) - 1;
+ if (I < E)
+ Bits[I / BITWORD_SIZE] |= PostfixMask;
+
return *this;
}
}
BitVector &reset(unsigned Idx) {
- Bits[Idx / BITWORD_SIZE] &= ~(1L << (Idx % BITWORD_SIZE));
+ Bits[Idx / BITWORD_SIZE] &= ~(BitWord(1) << (Idx % BITWORD_SIZE));
+ return *this;
+ }
+
+ /// reset - Efficiently reset a range of bits in [I, E)
+ BitVector &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 (I / BITWORD_SIZE == E / BITWORD_SIZE) {
+ BitWord EMask = 1UL << (E % BITWORD_SIZE);
+ BitWord IMask = 1UL << (I % BITWORD_SIZE);
+ BitWord Mask = EMask - IMask;
+ Bits[I / BITWORD_SIZE] &= ~Mask;
+ return *this;
+ }
+
+ BitWord PrefixMask = ~0UL << (I % BITWORD_SIZE);
+ Bits[I / BITWORD_SIZE] &= ~PrefixMask;
+ I = RoundUpToAlignment(I, BITWORD_SIZE);
+
+ for (; I + BITWORD_SIZE <= E; I += BITWORD_SIZE)
+ Bits[I / BITWORD_SIZE] = 0UL;
+
+ BitWord PostfixMask = (1UL << (E % BITWORD_SIZE)) - 1;
+ if (I < E)
+ Bits[I / BITWORD_SIZE] &= ~PostfixMask;
+
return *this;
}
}
BitVector &flip(unsigned Idx) {
- Bits[Idx / BITWORD_SIZE] ^= 1L << (Idx % BITWORD_SIZE);
+ Bits[Idx / BITWORD_SIZE] ^= BitWord(1) << (Idx % BITWORD_SIZE);
return *this;
}
- // No argument flip.
- BitVector operator~() const {
- return BitVector(*this).flip();
- }
-
// Indexing.
reference operator[](unsigned Idx) {
assert (Idx < Size && "Out-of-bounds Bit access.");
bool operator[](unsigned Idx) const {
assert (Idx < Size && "Out-of-bounds Bit access.");
- BitWord Mask = 1L << (Idx % BITWORD_SIZE);
+ BitWord Mask = BitWord(1) << (Idx % BITWORD_SIZE);
return (Bits[Idx / BITWORD_SIZE] & Mask) != 0;
}
return !(*this == RHS);
}
- // Intersection, union, disjoint union.
+ /// Intersection, union, disjoint union.
BitVector &operator&=(const BitVector &RHS) {
unsigned ThisWords = NumBitWords(size());
unsigned RHSWords = NumBitWords(RHS.size());
return *this;
}
- // reset - Reset bits that are set in RHS. Same as *this &= ~RHS.
+ /// reset - Reset bits that are set in RHS. Same as *this &= ~RHS.
BitVector &reset(const BitVector &RHS) {
unsigned ThisWords = NumBitWords(size());
unsigned RHSWords = NumBitWords(RHS.size());
return *this;
}
+ /// test - Check if (This - RHS) is zero.
+ /// This is the same as reset(RHS) and any().
+ bool test(const BitVector &RHS) const {
+ unsigned ThisWords = NumBitWords(size());
+ unsigned RHSWords = NumBitWords(RHS.size());
+ unsigned i;
+ for (i = 0; i != std::min(ThisWords, RHSWords); ++i)
+ if ((Bits[i] & ~RHS.Bits[i]) != 0)
+ return true;
+
+ for (; i != ThisWords ; ++i)
+ if (Bits[i] != 0)
+ return true;
+
+ return false;
+ }
+
BitVector &operator|=(const BitVector &RHS) {
if (size() < RHS.size())
resize(RHS.size());
return *this;
}
+ const BitVector &operator=(BitVector &&RHS) {
+ if (this == &RHS) return *this;
+
+ std::free(Bits);
+ Bits = RHS.Bits;
+ Size = RHS.Size;
+ Capacity = RHS.Capacity;
+
+ RHS.Bits = nullptr;
+
+ return *this;
+ }
+
void swap(BitVector &RHS) {
std::swap(Bits, RHS.Bits);
std::swap(Size, RHS.Size);
// Then set any stray high bits of the last used word.
unsigned ExtraBits = Size % BITWORD_SIZE;
if (ExtraBits) {
- Bits[UsedWords-1] &= ~(~0L << ExtraBits);
- Bits[UsedWords-1] |= (0 - (BitWord)t) << ExtraBits;
+ BitWord ExtraBitMask = ~0UL << ExtraBits;
+ if (t)
+ Bits[UsedWords-1] |= ExtraBitMask;
+ else
+ Bits[UsedWords-1] &= ~ExtraBitMask;
}
}
}
};
-inline BitVector operator&(const BitVector &LHS, const BitVector &RHS) {
- BitVector Result(LHS);
- Result &= RHS;
- return Result;
-}
-
-inline BitVector operator|(const BitVector &LHS, const BitVector &RHS) {
- BitVector Result(LHS);
- Result |= RHS;
- return Result;
-}
-
-inline BitVector operator^(const BitVector &LHS, const BitVector &RHS) {
- BitVector Result(LHS);
- Result ^= RHS;
- return Result;
-}
-
} // End llvm namespace
namespace std {
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