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Implement isOneBitSet in terms of APInt::countPopulation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35186 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-19 21:04:43 +00:00
parent 5a1e3e1a7d
commit 44e33e674a
1 changed files with 1 additions and 2 deletions
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lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3474,8 +3474,7 @@ static bool isMinValuePlusOne(const ConstantInt *C, bool isSigned) {
// isOneBitSet - Return true if there is exactly one bit set in the specified // isOneBitSet - Return true if there is exactly one bit set in the specified
// constant. // constant.
static bool isOneBitSet(const ConstantInt *CI) { static bool isOneBitSet(const ConstantInt *CI) {
uint64_t V = CI->getZExtValue(); return CI->getValue().countPopulation() == 1;
return V && (V & (V-1)) == 0;
} }
#if 0 // Currently unused #if 0 // Currently unused