X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FBitVector.h;h=82cfdf437d4e7f7cd827ca96ed70897c4b9db697;hb=6cd738f33934a93b114d7dd9e4291f87f445c5c4;hp=ac1cf0c79a8fe85ce031b4a298ad2521a980da19;hpb=28116c9f498ec3b40dae90b3a94ba4ceb1a2081c;p=oota-llvm.git diff --git a/include/llvm/ADT/BitVector.h b/include/llvm/ADT/BitVector.h index ac1cf0c79a8..82cfdf437d4 100644 --- a/include/llvm/ADT/BitVector.h +++ b/include/llvm/ADT/BitVector.h @@ -14,12 +14,13 @@ #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 #include #include #include -#include namespace llvm { @@ -97,6 +98,13 @@ public: std::memcpy(Bits, RHS.Bits, Capacity * sizeof(BitWord)); } +#if LLVM_HAS_RVALUE_REFERENCES + BitVector(BitVector &&RHS) + : Bits(RHS.Bits), Size(RHS.Size), Capacity(RHS.Capacity) { + RHS.Bits = 0; + } +#endif + ~BitVector() { std::free(Bits); } @@ -116,7 +124,7 @@ public: else if (sizeof(BitWord) == 8) NumBits += CountPopulation_64(Bits[i]); else - assert(0 && "Unsupported!"); + llvm_unreachable("Unsupported!"); return NumBits; } @@ -146,10 +154,9 @@ public: if (Bits[i] != 0) { if (sizeof(BitWord) == 4) return i * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Bits[i]); - else if (sizeof(BitWord) == 8) + if (sizeof(BitWord) == 8) return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]); - else - assert(0 && "Unsupported!"); + llvm_unreachable("Unsupported!"); } return -1; } @@ -165,15 +172,14 @@ public: 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); - else if (sizeof(BitWord) == 8) + if (sizeof(BitWord) == 8) return WordPos * BITWORD_SIZE + CountTrailingZeros_64(Copy); - else - assert(0 && "Unsupported!"); + llvm_unreachable("Unsupported!"); } // Check subsequent words. @@ -181,10 +187,9 @@ public: if (Bits[i] != 0) { if (sizeof(BitWord) == 4) return i * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Bits[i]); - else if (sizeof(BitWord) == 8) + if (sizeof(BitWord) == 8) return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]); - else - assert(0 && "Unsupported!"); + llvm_unreachable("Unsupported!"); } return -1; } @@ -232,6 +237,34 @@ public: 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; + Bits[I / BITWORD_SIZE] |= PostfixMask; + + return *this; + } + BitVector &reset() { init_words(Bits, Capacity, false); return *this; @@ -242,6 +275,34 @@ public: 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; + Bits[I / BITWORD_SIZE] &= ~PostfixMask; + + return *this; + } + BitVector &flip() { for (unsigned i = 0; i < NumBitWords(size()); ++i) Bits[i] = ~Bits[i]; @@ -254,11 +315,6 @@ public: 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."); @@ -275,6 +331,16 @@ public: return (*this)[Idx]; } + /// Test if any common bits are set. + bool anyCommon(const BitVector &RHS) const { + unsigned ThisWords = NumBitWords(size()); + unsigned RHSWords = NumBitWords(RHS.size()); + for (unsigned i = 0, e = std::min(ThisWords, RHSWords); i != e; ++i) + if (Bits[i] & RHS.Bits[i]) + return true; + return false; + } + // Comparison operators. bool operator==(const BitVector &RHS) const { unsigned ThisWords = NumBitWords(size()); @@ -301,7 +367,7 @@ public: 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()); @@ -318,6 +384,33 @@ public: return *this; } + /// 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()); + unsigned i; + for (i = 0; i != std::min(ThisWords, RHSWords); ++i) + Bits[i] &= ~RHS.Bits[i]; + 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()); @@ -359,12 +452,63 @@ public: return *this; } +#if LLVM_HAS_RVALUE_REFERENCES + const BitVector &operator=(BitVector &&RHS) { + if (this == &RHS) return *this; + + std::free(Bits); + Bits = RHS.Bits; + Size = RHS.Size; + Capacity = RHS.Capacity; + + RHS.Bits = 0; + + return *this; + } +#endif + void swap(BitVector &RHS) { std::swap(Bits, RHS.Bits); std::swap(Size, RHS.Size); std::swap(Capacity, RHS.Capacity); } + //===--------------------------------------------------------------------===// + // Portable bit mask operations. + //===--------------------------------------------------------------------===// + // + // These methods all operate on arrays of uint32_t, each holding 32 bits. The + // fixed word size makes it easier to work with literal bit vector constants + // in portable code. + // + // The LSB in each word is the lowest numbered bit. The size of a portable + // bit mask is always a whole multiple of 32 bits. If no bit mask size is + // given, the bit mask is assumed to cover the entire BitVector. + + /// 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) { + applyMask(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) { + applyMask(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) { + applyMask(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) { + applyMask(Mask, MaskWords); + } + private: unsigned NumBitWords(unsigned S) const { return (S + BITWORD_SIZE-1) / BITWORD_SIZE; @@ -380,8 +524,11 @@ private: // 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; } } @@ -400,25 +547,34 @@ private: void init_words(BitWord *B, unsigned NumWords, bool t) { memset(B, 0 - (int)t, NumWords*sizeof(BitWord)); } -}; - -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; -} + template + void applyMask(const uint32_t *Mask, unsigned MaskWords) { + assert(BITWORD_SIZE % 32 == 0 && "Unsupported BitWord size."); + MaskWords = std::min(MaskWords, (size() + 31) / 32); + const unsigned Scale = BITWORD_SIZE / 32; + unsigned i; + for (i = 0; MaskWords >= Scale; ++i, MaskWords -= Scale) { + BitWord BW = Bits[i]; + // This inner loop should unroll completely when BITWORD_SIZE > 32. + for (unsigned b = 0; b != BITWORD_SIZE; b += 32) { + uint32_t M = *Mask++; + if (InvertMask) M = ~M; + if (AddBits) BW |= BitWord(M) << b; + else BW &= ~(BitWord(M) << b); + } + Bits[i] = BW; + } + for (unsigned b = 0; MaskWords; b += 32, --MaskWords) { + uint32_t M = *Mask++; + if (InvertMask) M = ~M; + if (AddBits) Bits[i] |= BitWord(M) << b; + else Bits[i] &= ~(BitWord(M) << b); + } + if (AddBits) + clear_unused_bits(); + } +}; } // End llvm namespace