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Implement isMinValuePlusOne using facilities of APInt instead of uint64_t

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Patch by Zhou Sheng.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-19 21:08:07 +00:00
parent 44e33e674a
commit 727992c30a
1 changed files with 4 additions and 5 deletions
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9
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3463,12 +3463,11 @@ static bool isMaxValueMinusOne(const ConstantInt *C, bool isSigned) {
static bool isMinValuePlusOne(const ConstantInt *C, bool isSigned) { static bool isMinValuePlusOne(const ConstantInt *C, bool isSigned) {
if (isSigned) { if (isSigned) {
// Calculate 1111111111000000000000 // Calculate 1111111111000000000000
unsigned TypeBits = C->getType()->getPrimitiveSizeInBits(); uint32_t TypeBits = C->getType()->getPrimitiveSizeInBits();
int64_t Val = -1; // All ones APInt Val(APInt::getSignedMinValue(TypeBits));
Val <<= TypeBits-1; // Shift over to the right spot return C->getValue() == Val+1;
return C->getSExtValue() == Val+1;
} }
return C->getZExtValue() == 1; // unsigned return C->getValue() == 1; // unsigned
} }
// 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