Fixed bug in SmallDenseMap where it wouldn't leave enough space for an empty bucket...

[oota-llvm.git] / include / llvm / ADT / SparseBitVector.h

diff --git a/include/llvm/ADT/SparseBitVector.h b/include/llvm/ADT/SparseBitVector.h
index 66a561323778fb898fe2da81f4ed0e741d233528..306e92832f0b0fd43b64e4f2dd6bdf83c3f483d4 100644 (file)
--- a/include/llvm/ADT/SparseBitVector.h
+++ b/include/llvm/ADT/SparseBitVector.h
@@ -262,6 +262,22 @@ public:
   }
 };
 
+template <unsigned ElementSize>
+struct ilist_traits<SparseBitVectorElement<ElementSize> >
+  : public ilist_default_traits<SparseBitVectorElement<ElementSize> > {
+  typedef SparseBitVectorElement<ElementSize> Element;
+
+  Element *createSentinel() const { return static_cast<Element *>(&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<Element> Sentinel;
+};
+
 template <unsigned ElementSize = 128>
 class SparseBitVector {
   typedef ilist<SparseBitVectorElement<ElementSize> > ElementList;
@@ -763,7 +779,7 @@ public:
     return false;
   }
 
-  // Return true if all bits set in this SparseBitVector are
+  // Return true iff all bits set in this SparseBitVector are
   // also set in RHS.
   bool contains(const SparseBitVector<ElementSize> &RHS) const {
     SparseBitVector<ElementSize> Result(*this);