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Implement isMaxValueMinusOne in terms of APInt instead of uint64_t. 

Patch by Sheng Zhou.

llvm-svn: 35188
This commit is contained in:
Reid Spencer 2007-03-19 21:10:28 +00:00
parent 3b93db72b4
commit ef599b0786
1 changed files with 4 additions and 5 deletions
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9
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3449,14 +3449,13 @@ Instruction *InstCombiner::visitFRem(BinaryOperator &I) {
// isMaxValueMinusOne - return true if this is Max-1 // isMaxValueMinusOne - return true if this is Max-1
static bool isMaxValueMinusOne(const ConstantInt *C, bool isSigned) { static bool isMaxValueMinusOne(const ConstantInt *C, bool isSigned) {
uint32_t TypeBits = C->getType()->getPrimitiveSizeInBits();
if (isSigned) { if (isSigned) {
// Calculate 0111111111..11111 // Calculate 0111111111..11111
unsigned TypeBits = C->getType()->getPrimitiveSizeInBits(); APInt Val(APInt::getSignedMaxValue(TypeBits));
int64_t Val = INT64_MAX; // All ones return C->getValue() == Val-1;
Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
return C->getSExtValue() == Val-1;
} }
return C->getZExtValue() == C->getType()->getBitMask()-1; return C->getValue() == APInt::getAllOnesValue(TypeBits) - 1;
} }
// isMinValuePlusOne - return true if this is Min+1 // isMinValuePlusOne - return true if this is Min+1