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BitVector: Do the right thing in all() when Size is a multiple of BITWORD_SIZE.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183525 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2013-06-07 15:14:31 +00:00
parent 597253da97
commit a77376dae1
2 changed files with 22 additions and 7 deletions
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13
include/llvm/ADT/BitVector.h
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@ -138,16 +138,15 @@ public:
/// all - Returns true if all bits are set.
bool all() const {
if (empty())
return true;
for (unsigned i = 0; i < NumBitWords(size()) - 1; ++i)
for (unsigned i = 0; i < Size / BITWORD_SIZE; ++i)
if (Bits[i] != ~0UL)
return false;
// For the last word check that the lower bits are ones. The unused bits are
// always zero.
return Bits[NumBitWords(size()) - 1] == ~(~0UL << (Size % BITWORD_SIZE));
// If bits remain check that they are ones. The unused bits are always zero.
if (unsigned Remainder = Size % BITWORD_SIZE)
return Bits[Size / BITWORD_SIZE] == (1UL << Remainder) - 1;
return true;
}
/// none - Returns true if none of the bits are set.

16
unittests/ADT/BitVectorTest.cpp
View File

@ -149,6 +149,22 @@ TYPED_TEST(BitVectorTest, TrivialOperation) {
EXPECT_FALSE(Vec.none());
EXPECT_FALSE(Vec.empty());
Vec.resize(64);
EXPECT_EQ(64U, Vec.count());
EXPECT_EQ(64U, Vec.size());
EXPECT_TRUE(Vec.any());
EXPECT_TRUE(Vec.all());
EXPECT_FALSE(Vec.none());
EXPECT_FALSE(Vec.empty());
Vec.flip();
EXPECT_EQ(0U, Vec.count());
EXPECT_EQ(64U, Vec.size());
EXPECT_FALSE(Vec.any());
EXPECT_FALSE(Vec.all());
EXPECT_TRUE(Vec.none());
EXPECT_FALSE(Vec.empty());
Inv = TypeParam().flip();
EXPECT_EQ(0U, Inv.count());
EXPECT_EQ(0U, Inv.size());