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Added bx::findLastSet.

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Бранимир Караџић
2024-11-09 21:37:19 -08:00
parent 2cebc558eb
commit 7d3cb465a4
3 changed files with 178 additions and 97 deletions
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20
include/bx/inline/math.inl
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@@ -371,16 +371,24 @@ namespace bx
}
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(uint8_t _val) { return bx::min<uint8_t>(8, countTrailingZeros<uint32_t>(_val) ); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int8_t _val) { return countTrailingZeros<uint8_t >(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int8_t _val) { return countTrailingZeros<uint8_t >(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(uint16_t _val) { return bx::min<uint8_t>(16, countTrailingZeros<uint32_t>(_val) ); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int16_t _val) { return countTrailingZeros<uint16_t>(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int32_t _val) { return countTrailingZeros<uint32_t>(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int64_t _val) { return countTrailingZeros<uint64_t>(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int16_t _val) { return countTrailingZeros<uint16_t>(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int32_t _val) { return countTrailingZeros<uint32_t>(_val); }
template<> inline BX_CONSTEXPR_FUNC uint8_t countTrailingZeros(int64_t _val) { return countTrailingZeros<uint64_t>(_val); }
template<typename Ty>
inline BX_CONSTEXPR_FUNC uint8_t findFirstSet(Ty _x)
inline BX_CONSTEXPR_FUNC uint8_t findFirstSet(Ty _val)
{
return Ty(0) == _x ? uint8_t(0) : countTrailingZeros<Ty>(_x) + 1;
BX_STATIC_ASSERT(isInteger<Ty>(), "Type Ty must be of integer type!");
return Ty(0) == _val ? uint8_t(0) : countTrailingZeros<Ty>(_val) + 1;
}
template<typename Ty>
inline BX_CONSTEXPR_FUNC uint8_t findLastSet(Ty _val)
{
BX_STATIC_ASSERT(isInteger<Ty>(), "Type Ty must be of integer type!");
return Ty(0) == _val ? uint8_t(0) : sizeof(Ty)*8 - countLeadingZeros<Ty>(_val);
}
template<typename Ty>

5
include/bx/math.h
View File

@@ -299,6 +299,11 @@ namespace bx
template<typename Ty>
BX_CONSTEXPR_FUNC uint8_t findFirstSet(Ty _val);
/// Find last set.
///
template<typename Ty>
BX_CONSTEXPR_FUNC uint8_t findLastSet(Ty _val);
/// Returns the next smallest integer base 2 logarithm of _a.
///
template<typename Ty>