X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FBitVector.h;h=9c046efaaddd9cf7bfec7d6d70b37e23f848417e;hb=7c718222cdb624f4c420b3d7b6eeb12fffc05603;hp=fccb1c6e8abac0d921f009dce82ed5b204dba35f;hpb=34cd4a484e532cc463fd5a4bf59b88d13c5467c1;p=oota-llvm.git

diff --git a/include/llvm/ADT/BitVector.h b/include/llvm/ADT/BitVector.h
index fccb1c6e8ab..9c046efaadd 100644
--- a/include/llvm/ADT/BitVector.h
+++ b/include/llvm/ADT/BitVector.h
@@ -17,7 +17,7 @@
 #include "llvm/Support/MathExtras.h"
 #include <algorithm>
 #include <cassert>
-#include <cstdlib>
+#include <climits>
 #include <cstring>
 
 namespace llvm {
@@ -25,9 +25,9 @@ namespace llvm {
 class BitVector {
   typedef unsigned long BitWord;
 
-  enum { BITWORD_SIZE = (unsigned)sizeof(BitWord) * 8 };
+  enum { BITWORD_SIZE = (unsigned)sizeof(BitWord) * CHAR_BIT };
 
-  BitWord  *Bits;        // Actual bits. 
+  BitWord  *Bits;        // Actual bits.
   unsigned Size;         // Size of bitvector in bits.
   unsigned Capacity;     // Size of allocated memory in BitWord.
 
@@ -65,7 +65,7 @@ public:
 
   /// BitVector default ctor - Creates an empty bitvector.
   BitVector() : Size(0), Capacity(0) {
-    Bits = NULL;
+    Bits = 0;
   }
 
   /// BitVector ctor - Creates a bitvector of specified number of bits. All
@@ -81,7 +81,7 @@ public:
   /// BitVector copy ctor.
   BitVector(const BitVector &RHS) : Size(RHS.size()) {
     if (Size == 0) {
-      Bits = NULL;
+      Bits = 0;
       Capacity = 0;
       return;
     }
@@ -90,7 +90,7 @@ public:
     Bits = new BitWord[Capacity];
     std::copy(RHS.Bits, &RHS.Bits[Capacity], Bits);
   }
-  
+
   ~BitVector() {
     delete[] Bits;
   }
@@ -186,13 +186,13 @@ public:
       grow(N);
       init_words(&Bits[OldCapacity], (Capacity-OldCapacity), t);
     }
-    
-    // Set any old unused bits that are now included in the BitVector. This 
-    // may set bits that are not included in the new vector, but we will clear 
+
+    // Set any old unused bits that are now included in the BitVector. This
+    // may set bits that are not included in the new vector, but we will clear
     // them back out below.
     if (N > Size)
       set_unused_bits(t);
-    
+
     // Update the size, and clear out any bits that are now unused
     unsigned OldSize = Size;
     Size = N;
@@ -251,7 +251,7 @@ public:
   }
 
   bool operator[](unsigned Idx) const {
-    assert (Idx < Size && "Out-of-bounds Bit access.");   
+    assert (Idx < Size && "Out-of-bounds Bit access.");
     BitWord Mask = 1L << (Idx % BITWORD_SIZE);
     return (Bits[Idx / BITWORD_SIZE] & Mask) != 0;
   }
@@ -268,7 +268,7 @@ public:
     for (i = 0; i != std::min(ThisWords, RHSWords); ++i)
       if (Bits[i] != RHS.Bits[i])
         return false;
-    
+
     // Verify that any extra words are all zeros.
     if (i != ThisWords) {
       for (; i != ThisWords; ++i)
@@ -287,36 +287,36 @@ public:
   }
 
   // Intersection, union, disjoint union.
-  BitVector operator&=(const BitVector &RHS) {
+  BitVector &operator&=(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];
-    
+
     // Any bits that are just in this bitvector become zero, because they aren't
     // in the RHS bit vector.  Any words only in RHS are ignored because they
     // are already zero in the LHS.
     for (; i != ThisWords; ++i)
       Bits[i] = 0;
-    
+
     return *this;
   }
 
-  BitVector operator|=(const BitVector &RHS) {
+  BitVector &operator|=(const BitVector &RHS) {
     assert(Size == RHS.Size && "Illegal operation!");
     for (unsigned i = 0; i < NumBitWords(size()); ++i)
       Bits[i] |= RHS.Bits[i];
     return *this;
   }
 
-  BitVector operator^=(const BitVector &RHS) {
+  BitVector &operator^=(const BitVector &RHS) {
     assert(Size == RHS.Size && "Illegal operation!");
     for (unsigned i = 0; i < NumBitWords(size()); ++i)
       Bits[i] ^= RHS.Bits[i];
     return *this;
   }
-  
+
   // Assignment operator.
   const BitVector &operator=(const BitVector &RHS) {
     if (this == &RHS) return *this;
@@ -328,7 +328,7 @@ public:
       clear_unused_bits();
       return *this;
     }
-  
+
     // Grow the bitvector to have enough elements.
     Capacity = RHSWords;
     BitWord *NewBits = new BitWord[Capacity];
@@ -345,14 +345,14 @@ private:
   unsigned NumBitWords(unsigned S) const {
     return (S + BITWORD_SIZE-1) / BITWORD_SIZE;
   }
-  
+
   // Set the unused bits in the high words.
   void set_unused_bits(bool t = true) {
     //  Set high words first.
     unsigned UsedWords = NumBitWords(Size);
     if (Capacity > UsedWords)
       init_words(&Bits[UsedWords], (Capacity-UsedWords), t);
-    
+
     //  Then set any stray high bits of the last used word.
     unsigned ExtraBits = Size % BITWORD_SIZE;
     if (ExtraBits) {
@@ -378,13 +378,13 @@ private:
     // Destroy the old bits.
     delete[] Bits;
     Bits = NewBits;
-    
+
     clear_unused_bits();
   }
 
   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) {
@@ -404,6 +404,6 @@ inline BitVector operator^(const BitVector &LHS, const BitVector &RHS) {
   Result ^= RHS;
   return Result;
 }
- 
+
 } // End llvm namespace
 #endif