#include <cassert>
#include <cstring>
-#include <list>
#include <algorithm>
#include "llvm/Support/DataTypes.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/MathExtras.h"
-
+#include "llvm/ADT/ilist"
namespace llvm {
/// SparseBitVector is an implementation of a bitvector that is sparse by only
BITWORDS_PER_ELEMENT = (ElementSize + BITWORD_SIZE - 1) / BITWORD_SIZE,
BITS_PER_ELEMENT = ElementSize
};
+
+ SparseBitVectorElement<ElementSize> *getNext() const {
+ return Next;
+ }
+ SparseBitVectorElement<ElementSize> *getPrev() const {
+ return Prev;
+ }
+
+ void setNext(SparseBitVectorElement<ElementSize> *RHS) {
+ Next = RHS;
+ }
+ void setPrev(SparseBitVectorElement<ElementSize> *RHS) {
+ Prev = RHS;
+ }
+
private:
+ SparseBitVectorElement<ElementSize> *Next;
+ SparseBitVectorElement<ElementSize> *Prev;
// Index of Element in terms of where first bit starts.
unsigned ElementIndex;
BitWord Bits[BITWORDS_PER_ELEMENT];
- SparseBitVectorElement();
+ // Needed for sentinels
+ SparseBitVectorElement() {
+ ElementIndex = ~0UL;
+ memset(&Bits[0], 0, sizeof (BitWord) * BITWORDS_PER_ELEMENT);
+ }
+
+ friend struct ilist_traits<SparseBitVectorElement<ElementSize> >;
+
public:
explicit SparseBitVectorElement(unsigned Idx) {
ElementIndex = Idx;
bool intersects(const SparseBitVectorElement &RHS) const {
for (unsigned i = 0; i < BITWORDS_PER_ELEMENT; ++i) {
if (RHS.Bits[i] & Bits[i])
- return true;
+ return true;
}
return false;
}
-
+
// Intersect this Element with RHS and return true if this one changed.
// BecameZero is set to true if this element became all-zero bits.
bool intersectWith(const SparseBitVectorElement &RHS,
BecameZero = !allzero;
return changed;
}
+ // Three argument version of intersectWithComplement that intersects
+ // RHS1 & ~RHS2 into this element
+ void intersectWithComplement(const SparseBitVectorElement &RHS1,
+ const SparseBitVectorElement &RHS2,
+ bool &BecameZero) {
+ bool allzero = true;
+
+ BecameZero = false;
+ for (unsigned i = 0; i < BITWORDS_PER_ELEMENT; ++i) {
+ Bits[i] = RHS1.Bits[i] & ~RHS2.Bits[i];
+ if (Bits[i] != 0)
+ allzero = false;
+ }
+ BecameZero = !allzero;
+ }
};
template <unsigned ElementSize = 128>
class SparseBitVector {
- typedef std::list<SparseBitVectorElement<ElementSize> *> ElementList;
+ typedef ilist<SparseBitVectorElement<ElementSize> > ElementList;
typedef typename ElementList::iterator ElementListIter;
typedef typename ElementList::const_iterator ElementListConstIter;
enum {
// Search from our current iterator, either backwards or forwards,
// depending on what element we are looking for.
ElementListIter ElementIter = CurrElementIter;
- if ((*CurrElementIter)->index() == ElementIndex) {
+ if (CurrElementIter->index() == ElementIndex) {
return ElementIter;
- } else if ((*CurrElementIter)->index() > ElementIndex) {
+ } else if (CurrElementIter->index() > ElementIndex) {
while (ElementIter != Elements.begin()
- && (*ElementIter)->index() > ElementIndex)
+ && ElementIter->index() > ElementIndex)
--ElementIter;
} else {
while (ElementIter != Elements.end() &&
- (*ElementIter)->index() <= ElementIndex)
+ ElementIter->index() <= ElementIndex)
++ElementIter;
--ElementIter;
}
return;
}
Iter = BitVector->Elements.begin();
- BitNumber = (*Iter)->index() * ElementSize;
- unsigned BitPos = (*Iter)->find_first();
+ BitNumber = Iter->index() * ElementSize;
+ unsigned BitPos = Iter->find_first();
BitNumber += BitPos;
WordNumber = (BitNumber % ElementSize) / BITWORD_SIZE;
- Bits = (*Iter)->word(WordNumber);
+ Bits = Iter->word(WordNumber);
Bits >>= BitPos % BITWORD_SIZE;
}
// See if we ran out of Bits in this word.
if (!Bits) {
- int NextSetBitNumber = (*Iter)->find_next(BitNumber % ElementSize) ;
+ int NextSetBitNumber = Iter->find_next(BitNumber % ElementSize) ;
// If we ran out of set bits in this element, move to next element.
if (NextSetBitNumber == -1 || (BitNumber % ElementSize == 0)) {
- Iter++;
+ ++Iter;
WordNumber = 0;
// We may run out of elements in the bitmap.
return;
}
// Set up for next non zero word in bitmap.
- BitNumber = (*Iter)->index() * ElementSize;
- NextSetBitNumber = (*Iter)->find_first();
+ BitNumber = Iter->index() * ElementSize;
+ NextSetBitNumber = Iter->find_first();
BitNumber += NextSetBitNumber;
WordNumber = (BitNumber % ElementSize) / BITWORD_SIZE;
- Bits = (*Iter)->word(WordNumber);
+ Bits = Iter->word(WordNumber);
Bits >>= NextSetBitNumber % BITWORD_SIZE;
} else {
WordNumber = (NextSetBitNumber % ElementSize) / BITWORD_SIZE;
- Bits = (*Iter)->word(WordNumber);
+ Bits = Iter->word(WordNumber);
Bits >>= NextSetBitNumber % BITWORD_SIZE;
}
}
public:
// Preincrement.
inline SparseBitVectorIterator& operator++() {
- BitNumber++;
+ ++BitNumber;
Bits >>= 1;
AdvanceToNextNonZero();
return *this;
bool operator!=(const SparseBitVectorIterator &RHS) const {
return !(*this == RHS);
}
- SparseBitVectorIterator(): BitVector(NULL) {
+ SparseBitVectorIterator(): BitVector(NULL) {
}
-
-
+
+
SparseBitVectorIterator(const SparseBitVector<ElementSize> *RHS,
bool end = false):BitVector(RHS) {
Iter = BitVector->Elements.begin();
}
~SparseBitVector() {
- for_each(Elements.begin(), Elements.end(),
- deleter<SparseBitVectorElement<ElementSize> >);
}
// SparseBitVector copy ctor.
SparseBitVector(const SparseBitVector &RHS) {
ElementListConstIter ElementIter = RHS.Elements.begin();
while (ElementIter != RHS.Elements.end()) {
- SparseBitVectorElement<ElementSize> *ElementCopy;
- ElementCopy = new SparseBitVectorElement<ElementSize>(*(*ElementIter));
- Elements.push_back(ElementCopy);
+ Elements.push_back(SparseBitVectorElement<ElementSize>(*ElementIter));
+ ++ElementIter;
}
CurrElementIter = Elements.begin ();
// If we can't find an element that is supposed to contain this bit, there
// is nothing more to do.
if (ElementIter == Elements.end() ||
- (*ElementIter)->index() != ElementIndex)
+ ElementIter->index() != ElementIndex)
return false;
- return (*ElementIter)->test(Idx % ElementSize);
+ return ElementIter->test(Idx % ElementSize);
}
void reset(unsigned Idx) {
// If we can't find an element that is supposed to contain this bit, there
// is nothing more to do.
if (ElementIter == Elements.end() ||
- (*ElementIter)->index() != ElementIndex)
+ ElementIter->index() != ElementIndex)
return;
- (*ElementIter)->reset(Idx % ElementSize);
+ ElementIter->reset(Idx % ElementSize);
// When the element is zeroed out, delete it.
- if ((*ElementIter)->empty()) {
- delete (*ElementIter);
+ if (ElementIter->empty()) {
++CurrElementIter;
Elements.erase(ElementIter);
}
}
void set(unsigned Idx) {
- SparseBitVectorElement<ElementSize> *Element;
unsigned ElementIndex = Idx / ElementSize;
-
+ SparseBitVectorElement<ElementSize> *Element;
+ ElementListIter ElementIter;
if (Elements.empty()) {
Element = new SparseBitVectorElement<ElementSize>(ElementIndex);
- Elements.push_back(Element);
+ ElementIter = Elements.insert(Elements.end(), Element);
+
} else {
- ElementListIter ElementIter = FindLowerBound(ElementIndex);
+ ElementIter = FindLowerBound(ElementIndex);
- if (ElementIter != Elements.end() &&
- (*ElementIter)->index() == ElementIndex)
- Element = *ElementIter;
- else {
+ if (ElementIter == Elements.end() ||
+ ElementIter->index() != ElementIndex) {
Element = new SparseBitVectorElement<ElementSize>(ElementIndex);
// Insert does insert before, and lower bound gives the one before.
- Elements.insert(++ElementIter, Element);
+ ElementIter = Elements.insert(++ElementIter, Element);
}
}
- Element->set(Idx % ElementSize);
+ ElementIter->set(Idx % ElementSize);
}
-
+
bool test_and_set (unsigned Idx) {
bool old = test(Idx);
if (!old)
ElementListIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
- // IE They may both be end
- if (Iter1 == Iter2)
+ // Check if both bitmaps are empty
+ if (Elements.empty() && RHS.Elements.empty())
return false;
// See if the first bitmap element is the same in both. This is only
return false;
while (Iter2 != RHS.Elements.end()) {
- if (Iter1 == Elements.end() || (*Iter1)->index() > (*Iter2)->index()) {
- SparseBitVectorElement<ElementSize> *NewElem;
-
- NewElem = new SparseBitVectorElement<ElementSize>(*(*Iter2));
- Elements.insert(Iter1, NewElem);
- Iter2++;
+ if (Iter1 == Elements.end() || Iter1->index() > Iter2->index()) {
+ Elements.insert(Iter1,
+ new SparseBitVectorElement<ElementSize>(*Iter2));
+ ++Iter2;
changed = true;
- } else if ((*Iter1)->index() == (*Iter2)->index()) {
- changed |= (*Iter1)->unionWith(*(*Iter2));
- Iter1++;
- Iter2++;
+ } else if (Iter1->index() == Iter2->index()) {
+ changed |= Iter1->unionWith(*Iter2);
+ ++Iter1;
+ ++Iter2;
} else {
- Iter1++;
+ ++Iter1;
}
}
CurrElementIter = Elements.begin();
ElementListIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
- // IE They may both be end.
- if (Iter1 == Iter2)
+ // Check if both bitmaps are empty.
+ if (Elements.empty() && RHS.Elements.empty())
return false;
// See if the first bitmap element is the same in both. This is only
if (Iter1 == Elements.end())
return changed;
- if ((*Iter1)->index() > (*Iter2)->index()) {
- Iter2++;
- } else if ((*Iter1)->index() == (*Iter2)->index()) {
+ if (Iter1->index() > Iter2->index()) {
+ ++Iter2;
+ } else if (Iter1->index() == Iter2->index()) {
bool BecameZero;
- changed |= (*Iter1)->intersectWith(*(*Iter2), BecameZero);
+ changed |= Iter1->intersectWith(*Iter2, BecameZero);
if (BecameZero) {
ElementListIter IterTmp = Iter1;
- delete *IterTmp;
Elements.erase(IterTmp);
- Iter1++;
- } else {
- Iter1++;
}
- Iter2++;
+ ++Iter1;
+ ++Iter2;
} else {
ElementListIter IterTmp = Iter1;
- Iter1++;
- delete *IterTmp;
+ ++Iter1;
Elements.erase(IterTmp);
}
}
+ Elements.erase(Iter1, Elements.end());
CurrElementIter = Elements.begin();
return changed;
}
ElementListIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
- // IE They may both be end.
- if (Iter1 == Iter2)
+ // Check if they are both empty
+ if (Elements.empty() && RHS.Elements.empty())
return false;
// See if the first bitmap element is the same in both. This is only
Elements.clear();
return true;
}
-
+
// Loop through, intersecting as we go, erasing elements when necessary.
while (Iter2 != RHS.Elements.end()) {
if (Iter1 == Elements.end())
return changed;
- if ((*Iter1)->index() > (*Iter2)->index()) {
- Iter2++;
- } else if ((*Iter1)->index() == (*Iter2)->index()) {
+ if (Iter1->index() > Iter2->index()) {
+ ++Iter2;
+ } else if (Iter1->index() == Iter2->index()) {
bool BecameZero;
- changed |= (*Iter1)->intersectWithComplement(*(*Iter2), BecameZero);
+ changed |= Iter1->intersectWithComplement(*Iter2, BecameZero);
if (BecameZero) {
ElementListIter IterTmp = Iter1;
- delete *IterTmp;
Elements.erase(IterTmp);
- Iter1++;
- } else {
- Iter1++;
}
- Iter2++;
+ ++Iter1;
+ ++Iter2;
} else {
ElementListIter IterTmp = Iter1;
- Iter1++;
- delete *IterTmp;
+ ++Iter1;
Elements.erase(IterTmp);
}
}
bool intersectWithComplement(const SparseBitVector<ElementSize> *RHS) const {
return intersectWithComplement(*RHS);
}
-
-
+
+
+ // Three argument version of intersectWithComplement. Result of RHS1 & ~RHS2
+ // is stored into this bitmap.
+ void intersectWithComplement(const SparseBitVector<ElementSize> &RHS1,
+ const SparseBitVector<ElementSize> &RHS2)
+ {
+ Elements.clear();
+ ElementListConstIter Iter1 = RHS1.Elements.begin();
+ ElementListConstIter Iter2 = RHS2.Elements.begin();
+
+ // Check if they are both empty.
+ if (RHS1.empty() && RHS2.empty())
+ return;
+
+ // See if the first bitmap element is the same in both. This is only
+ // possible if they are the same bitmap.
+ if (Iter1 != RHS1.Elements.end() && Iter2 != RHS2.Elements.end())
+ if (*Iter1 == *Iter2) {
+ return;
+ }
+
+ // Loop through, intersecting as we go, erasing elements when necessary.
+ while (Iter2 != RHS2.Elements.end()) {
+ if (Iter1 == RHS1.Elements.end())
+ return;
+
+ if (Iter1->index() > Iter2->index()) {
+ ++Iter2;
+ } else if (Iter1->index() == Iter2->index()) {
+ bool BecameZero = false;
+ SparseBitVectorElement<ElementSize> *NewElement =
+ new SparseBitVectorElement<ElementSize>(Iter1->index());
+ NewElement->intersectWithComplement(*Iter1, *Iter2, BecameZero);
+ if (!BecameZero) {
+ Elements.push_back(NewElement);
+ }
+ else
+ delete NewElement;
+
+ ++Iter1;
+ ++Iter2;
+ } else {
+ ++Iter1;
+ }
+ }
+
+ // copy the remaining elements
+ while (Iter1 != RHS1.Elements.end()) {
+ SparseBitVectorElement<ElementSize> *NewElement =
+ new SparseBitVectorElement<ElementSize>(*Iter1);
+ Elements.push_back(NewElement);
+ ++Iter1;
+ }
+
+ CurrElementIter = Elements.begin();
+ return;
+ }
+
+ void intersectWithComplement(const SparseBitVector<ElementSize> *RHS1,
+ const SparseBitVector<ElementSize> *RHS2) {
+ intersectWithComplement(*RHS1, *RHS2);
+ }
+
bool intersects(const SparseBitVector<ElementSize> *RHS) const {
return intersects(*RHS);
}
-
+
// Return true if we share any bits in common with RHS
bool intersects(const SparseBitVector<ElementSize> &RHS) const {
ElementListConstIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
- // IE They may both be end.
- if (Iter1 == Iter2)
+ // Check if both bitmaps are empty.
+ if (Elements.empty() && RHS.Elements.empty())
return false;
// See if the first bitmap element is the same in both. This is only
if (*Iter1 == *Iter2) {
return true;
}
-
+
// Loop through, intersecting stopping when we hit bits in common.
while (Iter2 != RHS.Elements.end()) {
if (Iter1 == Elements.end())
return false;
- if ((*Iter1)->index() > (*Iter2)->index()) {
- Iter2++;
- } else if ((*Iter1)->index() == (*Iter2)->index()) {
- if ((*Iter1)->intersects(*(*Iter2)))
+ if (Iter1->index() > Iter2->index()) {
+ ++Iter2;
+ } else if (Iter1->index() == Iter2->index()) {
+ if (Iter1->intersects(*Iter2))
return true;
- Iter1++;
- Iter2++;
+ ++Iter1;
+ ++Iter2;
} else {
- Iter1++;
+ ++Iter1;
}
}
return false;
}
-
+
// Return the first set bit in the bitmap. Return -1 if no bits are set.
int find_first() const {
if (Elements.empty())
return -1;
- const SparseBitVectorElement<ElementSize> *First = *(Elements.begin());
- return (First->index() * ElementSize) + First->find_first();
+ const SparseBitVectorElement<ElementSize> &First = *(Elements.begin());
+ return (First.index() * ElementSize) + First.find_first();
}
// Return true if the SparseBitVector is empty
bool empty() const {
return Elements.empty();
}
-
+
unsigned count() const {
unsigned BitCount = 0;
for (ElementListConstIter Iter = Elements.begin();
Iter != Elements.end();
++Iter)
- BitCount += (*Iter)->count();
-
+ BitCount += Iter->count();
+
return BitCount;
}
iterator begin() const {
iterator end() const {
return iterator(this, ~0);
}
+
+ // Dump our bits to stderr
+ void dump(llvm::OStream &out) const {
+ out << "[ ";
+ for (iterator bi = begin();
+ bi != end();
+ ++bi) {
+ out << *bi << " ";
+ }
+ out << std::endl;
+ }
};
// Convenience functions to allow Or and And without dereferencing in the user
-// code.
+// code.
+
template <unsigned ElementSize>
-inline void operator |=(SparseBitVector<ElementSize> *LHS,
- const SparseBitVector<ElementSize> &RHS) {
- LHS->operator|=(RHS);
+inline bool operator |=(SparseBitVector<ElementSize> &LHS,
+ const SparseBitVector<ElementSize> *RHS) {
+ return LHS |= *RHS;
}
template <unsigned ElementSize>
-inline void operator |=(SparseBitVector<ElementSize> *LHS,
- const SparseBitVector<ElementSize> *RHS) {
- LHS->operator|=(RHS);
+inline bool operator |=(SparseBitVector<ElementSize> *LHS,
+ const SparseBitVector<ElementSize> &RHS) {
+ return LHS->operator|=(RHS);
}
template <unsigned ElementSize>
-inline void operator &=(SparseBitVector<ElementSize> *LHS,
+inline bool operator &=(SparseBitVector<ElementSize> *LHS,
const SparseBitVector<ElementSize> &RHS) {
- LHS->operator&=(RHS);
+ return LHS->operator&=(RHS);
}
template <unsigned ElementSize>
-inline void operator &=(SparseBitVector<ElementSize> *LHS,
+inline bool operator &=(SparseBitVector<ElementSize> &LHS,
const SparseBitVector<ElementSize> *RHS) {
- LHS->operator&=(RHS);
+ return LHS &= (*RHS);
}
-
+
}
#endif
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