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Implement rounded_div

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Round-to-nearest integral based division, optimized for unsigned integral.
Used in sceNpTrophyGetGameProgress.
Do not allow signed values for aligned_div(), align().
This commit is contained in:
Eladash 2019-12-16 21:56:14 +02:00 • committed by kd-11
parent e30173a835
commit db4041e079
6 changed files with 31 additions and 16 deletions
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25
Utilities/types.h
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@ -440,10 +440,29 @@ union alignas(2) f16
CHECK_SIZE_ALIGN(f16, 2, 2);
template <typename T, typename = std::enable_if_t<std::is_integral<T>::value>>
constexpr T align(const T& value, ullong align)
template <typename T, typename = std::enable_if_t<std::is_integral<T>::value && std::is_unsigned<T>::value>>
constexpr T align(T value, ullong align)
{
return static_cast<T>((value + (align - 1)) & ~(align - 1));
return static_cast<T>((value + (align - 1)) & (0 - align));
}
// General purpose aligned division, the result is rounded up not truncated
template <typename T, typename = std::enable_if_t<std::is_integral<T>::value && std::is_unsigned<T>::value>>
constexpr T aligned_div(T value, ullong align)
{
return static_cast<T>((value + align - 1) / align);
}
// General purpose aligned division, the result is rounded to nearest
template <typename T, typename = std::enable_if_t<std::is_integral<T>::value>>
constexpr T rounded_div(T value, std::conditional_t<std::is_signed<T>::value, llong, ullong> align)
{
if constexpr (std::is_unsigned<T>::value)
{
return static_cast<T>((value + (align / 2)) / align);
}
return static_cast<T>((value + (value < 0 ? 0 - align : align) / 2) / align);
}
template <typename T, typename T2>