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APInt: Add a fast case for isAllOnesValue.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184042 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2013-06-15 11:32:09 +00:00
parent 1750632ee1
commit 8dcff88982
1 changed files with 6 additions and 2 deletions
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8
include/llvm/ADT/APInt.h
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@ -337,13 +337,17 @@ public:
/// \brief Determine if all bits are set
///
/// This checks to see if the value has all bits of the APInt are set or not.
bool isAllOnesValue() const { return countPopulation() == BitWidth; }
bool isAllOnesValue() const {
if (isSingleWord())
return VAL == ~integerPart(0) >> (APINT_BITS_PER_WORD - BitWidth);
return countPopulationSlowCase() == BitWidth;
}
/// \brief Determine if this is the largest unsigned value.
///
/// This checks to see if the value of this APInt is the maximum unsigned
/// value for the APInt's bit width.
bool isMaxValue() const { return countPopulation() == BitWidth; }
bool isMaxValue() const { return isAllOnesValue(); }
/// \brief Determine if this is the largest signed value.
///