X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FSparseBitVector.h;h=706f2486226477ed92c7f2b9847de4b3f53d81b4;hb=9becc6c2afc7d62fd855912eacd11586feb4a760;hp=fc7ea021603bb1311f5570952972bf546fe1f540;hpb=e6f0479aee718e976fc077507ff6442a58325824;p=oota-llvm.git diff --git a/include/llvm/ADT/SparseBitVector.h b/include/llvm/ADT/SparseBitVector.h index fc7ea021603..706f2486226 100644 --- a/include/llvm/ADT/SparseBitVector.h +++ b/include/llvm/ADT/SparseBitVector.h @@ -2,8 +2,8 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by Daniel Berlin and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // @@ -15,13 +15,15 @@ #ifndef LLVM_ADT_SPARSEBITVECTOR_H #define LLVM_ADT_SPARSEBITVECTOR_H -#include -#include -#include +#include "llvm/ADT/ilist.h" +#include "llvm/ADT/ilist_node.h" #include "llvm/Support/DataTypes.h" -#include "llvm/ADT/STLExtras.h" +#include "llvm/Support/ErrorHandling.h" #include "llvm/Support/MathExtras.h" -#include "llvm/ADT/ilist" +#include "llvm/Support/raw_ostream.h" +#include +#include + namespace llvm { /// SparseBitVector is an implementation of a bitvector that is sparse by only @@ -39,57 +41,33 @@ namespace llvm { template -struct SparseBitVectorElement { +struct SparseBitVectorElement + : public ilist_node > { public: typedef unsigned long BitWord; enum { - BITWORD_SIZE = sizeof(BitWord) * 8, + BITWORD_SIZE = sizeof(BitWord) * CHAR_BIT, BITWORDS_PER_ELEMENT = (ElementSize + BITWORD_SIZE - 1) / BITWORD_SIZE, BITS_PER_ELEMENT = ElementSize }; - SparseBitVectorElement *getNext() const { - return Next; - } - SparseBitVectorElement *getPrev() const { - return Prev; - } - - void setNext(SparseBitVectorElement *RHS) { - Next = RHS; - } - void setPrev(SparseBitVectorElement *RHS) { - Prev = RHS; - } - private: - SparseBitVectorElement *Next; - SparseBitVectorElement *Prev; // Index of Element in terms of where first bit starts. unsigned ElementIndex; BitWord Bits[BITWORDS_PER_ELEMENT]; // Needed for sentinels + friend struct ilist_sentinel_traits; SparseBitVectorElement() { - ElementIndex = ~0UL; + ElementIndex = ~0U; memset(&Bits[0], 0, sizeof (BitWord) * BITWORDS_PER_ELEMENT); } - friend struct ilist_traits >; public: explicit SparseBitVectorElement(unsigned Idx) { ElementIndex = Idx; memset(&Bits[0], 0, sizeof (BitWord) * BITWORDS_PER_ELEMENT); } - ~SparseBitVectorElement() { - } - - // Copy ctor. - SparseBitVectorElement(const SparseBitVectorElement &RHS) { - ElementIndex = RHS.ElementIndex; - std::copy(&RHS.Bits[0], &RHS.Bits[BITWORDS_PER_ELEMENT], Bits); - } - // Comparison. bool operator==(const SparseBitVectorElement &RHS) const { if (ElementIndex != RHS.ElementIndex) @@ -150,7 +128,7 @@ public: else if (sizeof(BitWord) == 8) NumBits += CountPopulation_64(Bits[i]); else - assert(0 && "Unsupported!"); + llvm_unreachable("Unsupported!"); return NumBits; } @@ -159,49 +137,45 @@ public: for (unsigned i = 0; i < BITWORDS_PER_ELEMENT; ++i) if (Bits[i] != 0) { if (sizeof(BitWord) == 4) - return i * BITWORD_SIZE + CountTrailingZeros_32(Bits[i]); - else if (sizeof(BitWord) == 8) - return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]); - else - assert(0 && "Unsupported!"); + return i * BITWORD_SIZE + countTrailingZeros(Bits[i]); + if (sizeof(BitWord) == 8) + return i * BITWORD_SIZE + countTrailingZeros(Bits[i]); + llvm_unreachable("Unsupported!"); } - assert(0 && "Illegal empty element"); + llvm_unreachable("Illegal empty element"); } - /// find_next - Returns the index of the next set bit following the - /// "Prev" bit. Returns -1 if the next set bit is not found. - int find_next(unsigned Prev) const { - ++Prev; - if (Prev >= BITS_PER_ELEMENT) + /// find_next - Returns the index of the next set bit starting from the + /// "Curr" bit. Returns -1 if the next set bit is not found. + int find_next(unsigned Curr) const { + if (Curr >= BITS_PER_ELEMENT) return -1; - unsigned WordPos = Prev / BITWORD_SIZE; - unsigned BitPos = Prev % BITWORD_SIZE; + unsigned WordPos = Curr / BITWORD_SIZE; + unsigned BitPos = Curr % BITWORD_SIZE; BitWord Copy = Bits[WordPos]; assert (WordPos <= BITWORDS_PER_ELEMENT && "Word Position outside of element"); // Mask off previous bits. - Copy &= ~0L << BitPos; + Copy &= ~0UL << BitPos; if (Copy != 0) { if (sizeof(BitWord) == 4) - return WordPos * BITWORD_SIZE + CountTrailingZeros_32(Copy); - else if (sizeof(BitWord) == 8) - return WordPos * BITWORD_SIZE + CountTrailingZeros_64(Copy); - else - assert(0 && "Unsupported!"); + return WordPos * BITWORD_SIZE + countTrailingZeros(Copy); + if (sizeof(BitWord) == 8) + return WordPos * BITWORD_SIZE + countTrailingZeros(Copy); + llvm_unreachable("Unsupported!"); } // Check subsequent words. for (unsigned i = WordPos+1; i < BITWORDS_PER_ELEMENT; ++i) if (Bits[i] != 0) { if (sizeof(BitWord) == 4) - return i * BITWORD_SIZE + CountTrailingZeros_32(Bits[i]); - else if (sizeof(BitWord) == 8) - return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]); - else - assert(0 && "Unsupported!"); + return i * BITWORD_SIZE + countTrailingZeros(Bits[i]); + if (sizeof(BitWord) == 8) + return i * BITWORD_SIZE + countTrailingZeros(Bits[i]); + llvm_unreachable("Unsupported!"); } return -1; } @@ -286,15 +260,22 @@ public: } BecameZero = allzero; } +}; - // Get a hash value for this element; - uint64_t getHashValue() const { - uint64_t HashVal = 0; - for (unsigned i = 0; i < BITWORDS_PER_ELEMENT; ++i) { - HashVal ^= Bits[i]; - } - return HashVal; - } +template +struct ilist_traits > + : public ilist_default_traits > { + typedef SparseBitVectorElement Element; + + Element *createSentinel() const { return static_cast(&Sentinel); } + static void destroySentinel(Element *) {} + + Element *provideInitialHead() const { return createSentinel(); } + Element *ensureHead(Element *) const { return createSentinel(); } + static void noteHead(Element *, Element *) {} + +private: + mutable ilist_half_node Sentinel; }; template @@ -334,9 +315,8 @@ class SparseBitVector { --ElementIter; } else { while (ElementIter != Elements.end() && - ElementIter->index() <= ElementIndex) + ElementIter->index() < ElementIndex) ++ElementIter; - --ElementIter; } CurrElementIter = ElementIter; return ElementIter; @@ -402,7 +382,7 @@ class SparseBitVector { AtEnd = true; return; } - // Set up for next non zero word in bitmap. + // Set up for next non-zero word in bitmap. BitNumber = Iter->index() * ElementSize; NextSetBitNumber = Iter->find_first(); BitNumber += NextSetBitNumber; @@ -441,7 +421,7 @@ class SparseBitVector { bool operator==(const SparseBitVectorIterator &RHS) const { // If they are both at the end, ignore the rest of the fields. - if (AtEnd == RHS.AtEnd) + if (AtEnd && RHS.AtEnd) return true; // Otherwise they are the same if they have the same bit number and // bitmap. @@ -485,6 +465,26 @@ public: CurrElementIter = Elements.begin (); } + // Clear. + void clear() { + Elements.clear(); + } + + // Assignment + SparseBitVector& operator=(const SparseBitVector& RHS) { + Elements.clear(); + + ElementListConstIter ElementIter = RHS.Elements.begin(); + while (ElementIter != RHS.Elements.end()) { + Elements.push_back(SparseBitVectorElement(*ElementIter)); + ++ElementIter; + } + + CurrElementIter = Elements.begin (); + + return *this; + } + // Test, Reset, and Set a bit in the bitmap. bool test(unsigned Idx) { if (Elements.empty()) @@ -536,10 +536,18 @@ public: if (ElementIter == Elements.end() || ElementIter->index() != ElementIndex) { Element = new SparseBitVectorElement(ElementIndex); - // Insert does insert before, and lower bound gives the one before. - ElementIter = Elements.insert(++ElementIter, Element); + // We may have hit the beginning of our SparseBitVector, in which case, + // we may need to insert right after this element, which requires moving + // the current iterator forward one, because insert does insert before. + if (ElementIter != Elements.end() && + ElementIter->index() < ElementIndex) + ElementIter = Elements.insert(++ElementIter, Element); + else + ElementIter = Elements.insert(ElementIter, Element); } } + CurrElementIter = ElementIter; + ElementIter->set(Idx % ElementSize); } @@ -574,8 +582,8 @@ public: ElementListIter Iter1 = Elements.begin(); ElementListConstIter Iter2 = RHS.Elements.begin(); - // Check if both bitmaps are empty - if (Elements.empty() && RHS.Elements.empty()) + // If RHS is empty, we are done + if (RHS.Elements.empty()) return false; while (Iter2 != RHS.Elements.end()) { @@ -608,8 +616,10 @@ public: // Loop through, intersecting as we go, erasing elements when necessary. while (Iter2 != RHS.Elements.end()) { - if (Iter1 == Elements.end()) + if (Iter1 == Elements.end()) { + CurrElementIter = Elements.begin(); return changed; + } if (Iter1->index() > Iter2->index()) { ++Iter2; @@ -635,21 +645,23 @@ public: return changed; } - // Intersect our bitmap with the complement of the RHS and return true if ours - // changed. + // Intersect our bitmap with the complement of the RHS and return true + // if ours changed. bool intersectWithComplement(const SparseBitVector &RHS) { bool changed = false; ElementListIter Iter1 = Elements.begin(); ElementListConstIter Iter2 = RHS.Elements.begin(); - // Check if they are both empty - if (Elements.empty() && RHS.Elements.empty()) + // If either our bitmap or RHS is empty, we are done + if (Elements.empty() || RHS.Elements.empty()) return false; // Loop through, intersecting as we go, erasing elements when necessary. while (Iter2 != RHS.Elements.end()) { - if (Iter1 == Elements.end()) + if (Iter1 == Elements.end()) { + CurrElementIter = Elements.begin(); return changed; + } if (Iter1->index() > Iter2->index()) { ++Iter2; @@ -665,9 +677,7 @@ public: } ++Iter2; } else { - ElementListIter IterTmp = Iter1; ++Iter1; - Elements.erase(IterTmp); } } CurrElementIter = Elements.begin(); @@ -679,17 +689,19 @@ public: } - // Three argument version of intersectWithComplement. Result of RHS1 & ~RHS2 - // is stored into this bitmap. + // Three argument version of intersectWithComplement. + // Result of RHS1 & ~RHS2 is stored into this bitmap. void intersectWithComplement(const SparseBitVector &RHS1, const SparseBitVector &RHS2) { Elements.clear(); + CurrElementIter = Elements.begin(); ElementListConstIter Iter1 = RHS1.Elements.begin(); ElementListConstIter Iter2 = RHS2.Elements.begin(); - // Check if they are both empty. - if (RHS1.empty() && RHS2.empty()) + // If RHS1 is empty, we are done + // If RHS2 is empty, we still have to copy RHS1 + if (RHS1.Elements.empty()) return; // Loop through, intersecting as we go, erasing elements when necessary. @@ -712,6 +724,9 @@ public: ++Iter1; ++Iter2; } else { + SparseBitVectorElement *NewElement = + new SparseBitVectorElement(*Iter1); + Elements.push_back(NewElement); ++Iter1; } } @@ -724,7 +739,6 @@ public: ++Iter1; } - CurrElementIter = Elements.begin(); return; } @@ -765,6 +779,14 @@ public: return false; } + // Return true iff all bits set in this SparseBitVector are + // also set in RHS. + bool contains(const SparseBitVector &RHS) const { + SparseBitVector Result(*this); + Result &= RHS; + return (Result == RHS); + } + // Return the first set bit in the bitmap. Return -1 if no bits are set. int find_first() const { if (Elements.empty()) @@ -792,19 +814,7 @@ public: } iterator end() const { - return iterator(this, ~0); - } - - // Get a hash value for this bitmap. - uint64_t getHashValue() const { - uint64_t HashVal = 0; - for (ElementListConstIter Iter = Elements.begin(); - Iter != Elements.end(); - ++Iter) { - HashVal ^= Iter->index(); - HashVal ^= Iter->getHashValue(); - } - return HashVal; + return iterator(this, true); } }; @@ -832,23 +842,56 @@ inline bool operator &=(SparseBitVector *LHS, template inline bool operator &=(SparseBitVector &LHS, const SparseBitVector *RHS) { - return LHS &= (*RHS); + return LHS &= *RHS; } +// Convenience functions for infix union, intersection, difference operators. -// Dump a SparseBitVector to a stream template -void dump(const SparseBitVector &LHS, llvm::OStream &out) { - out << "[ "; +inline SparseBitVector +operator|(const SparseBitVector &LHS, + const SparseBitVector &RHS) { + SparseBitVector Result(LHS); + Result |= RHS; + return Result; +} - typename SparseBitVector::iterator bi; - for (bi = LHS.begin(); bi != LHS.end(); ++bi) { - out << *bi << " "; - } - out << " ]\n"; +template +inline SparseBitVector +operator&(const SparseBitVector &LHS, + const SparseBitVector &RHS) { + SparseBitVector Result(LHS); + Result &= RHS; + return Result; } + +template +inline SparseBitVector +operator-(const SparseBitVector &LHS, + const SparseBitVector &RHS) { + SparseBitVector Result; + Result.intersectWithComplement(LHS, RHS); + return Result; } + +// Dump a SparseBitVector to a stream +template +void dump(const SparseBitVector &LHS, raw_ostream &out) { + out << "["; + + typename SparseBitVector::iterator bi = LHS.begin(), + be = LHS.end(); + if (bi != be) { + out << *bi; + for (++bi; bi != be; ++bi) { + out << " " << *bi; + } + } + out << "]\n"; +} +} // end namespace llvm + #endif