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Bug 1821362 - Add a generic CountTrailingZeroes function that lowers to the right intrinsic based the type its called with. r=sergesanspaille

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Differential Revision: https://phabricator.services.mozilla.com/D173314
This commit is contained in:
Paul Adenot 2023-05-24 13:18:41 +00:00
parent cbf71085fb
commit 31157559f1
1 changed files with 13 additions and 0 deletions
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13
mfbt/MathAlgorithms.h
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@ -453,6 +453,19 @@ inline T Clamp(const T aValue, const T aMin, const T aMax) {
return aValue;
}
template <typename T>
inline uint_fast8_t CountTrailingZeroes(T aValue) {
static_assert(sizeof(T) <= 8);
static_assert(std::is_integral_v<T>);
// This casts to 32-bits
if constexpr (sizeof(T) <= 4) {
return CountTrailingZeroes32(aValue);
}
// This doesn't
if constexpr (sizeof(T) == 8) {
return CountTrailingZeroes64(aValue);
}
}
} /* namespace mozilla */
#endif /* mozilla_MathAlgorithms_h */