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APInt: microoptimize a few methods.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120912 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2010-12-04 18:05:36 +00:00
parent bd7d2622a2
commit fd6d53fbad
2 changed files with 9 additions and 10 deletions
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15
include/llvm/ADT/APInt.h
View File

@ -296,7 +296,7 @@ public:
/// @returns true if this APInt is positive.
/// @brief Determine if this APInt Value is positive.
bool isStrictlyPositive() const {
return isNonNegative() && (*this) != 0;
return isNonNegative() && !!*this;
}
/// This checks to see if the value has all bits of the APInt are set or not.
@ -324,15 +324,14 @@ public:
/// value for the APInt's bit width.
/// @brief Determine if this is the smallest unsigned value.
bool isMinValue() const {
return countPopulation() == 0;
return !*this;
}
/// This checks to see if the value of this APInt is the minimum signed
/// value for the APInt's bit width.
/// @brief Determine if this is the smallest signed value.
bool isMinSignedValue() const {
return BitWidth == 1 ? VAL == 1 :
isNegative() && countPopulation() == 1;
return BitWidth == 1 ? VAL == 1 : isNegative() && isPowerOf2();
}
/// @brief Check if this APInt has an N-bits unsigned integer value.
@ -355,7 +354,11 @@ public:
}
/// @returns true if the argument APInt value is a power of two > 0.
bool isPowerOf2() const;
bool isPowerOf2() const {
if (isSingleWord())
return isPowerOf2_64(VAL);
return countPopulationSlowCase() == 1;
}
/// isSignBit - Return true if this is the value returned by getSignBit.
bool isSignBit() const { return isMinSignedValue(); }
@ -363,7 +366,7 @@ public:
/// This converts the APInt to a boolean value as a test against zero.
/// @brief Boolean conversion function.
bool getBoolValue() const {
return *this != 0;
return !!*this;
}
/// getLimitedValue - If this value is smaller than the specified limit,

4
lib/Support/APInt.cpp
View File

@ -759,10 +759,6 @@ APInt APInt::getLoBits(unsigned numBits) const {
BitWidth - numBits);
}
bool APInt::isPowerOf2() const {
return (!!*this) && !(*this & (*this - APInt(BitWidth,1)));
}
unsigned APInt::countLeadingZerosSlowCase() const {
// Treat the most significand word differently because it might have
// meaningless bits set beyond the precision.