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Shifting into the sign bit is UB as discussed on IRC. Explicitly use the

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BitWord type for the constants to avoid this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205257 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Joerg Sonnenberger 2014-03-31 22:53:57 +00:00
parent d8c9577764
commit d73449481d
1 changed files with 7 additions and 7 deletions
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14
include/llvm/ADT/BitVector.h
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@ -58,14 +58,14 @@ public:
reference& operator=(bool t) {
if (t)
*WordRef |= 1L << BitPos;
*WordRef |= BitWord(1) << BitPos;
else
*WordRef &= ~(1L << BitPos);
*WordRef &= ~(BitWord(1) << BitPos);
return *this;
}
operator bool() const {
return ((*WordRef) & (1L << BitPos)) ? true : false;
return ((*WordRef) & (BitWord(1) << BitPos)) ? true : false;
}
};
@ -238,7 +238,7 @@ public:
}
BitVector &set(unsigned Idx) {
Bits[Idx / BITWORD_SIZE] |= 1L << (Idx % BITWORD_SIZE);
Bits[Idx / BITWORD_SIZE] |= BitWord(1) << (Idx % BITWORD_SIZE);
return *this;
}
@ -277,7 +277,7 @@ public:
}
BitVector &reset(unsigned Idx) {
Bits[Idx / BITWORD_SIZE] &= ~(1L << (Idx % BITWORD_SIZE));
Bits[Idx / BITWORD_SIZE] &= ~(BitWord(1) << (Idx % BITWORD_SIZE));
return *this;
}
@ -318,7 +318,7 @@ public:
}
BitVector &flip(unsigned Idx) {
Bits[Idx / BITWORD_SIZE] ^= 1L << (Idx % BITWORD_SIZE);
Bits[Idx / BITWORD_SIZE] ^= BitWord(1) << (Idx % BITWORD_SIZE);
return *this;
}
@ -330,7 +330,7 @@ public:
bool operator[](unsigned Idx) const {
assert (Idx < Size && "Out-of-bounds Bit access.");
BitWord Mask = 1L << (Idx % BITWORD_SIZE);
BitWord Mask = BitWord(1) << (Idx % BITWORD_SIZE);
return (Bits[Idx / BITWORD_SIZE] & Mask) != 0;
}