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[Base] Add typename to sat_add/sub

This commit is contained in:
Triang3l 2019-07-20 16:14:13 +03:00
parent 26c24b4726
commit 2350810f4e
1 changed files with 7 additions and 5 deletions
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12
src/xenia/base/math.h
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@ -303,13 +303,14 @@ int64_t m128_i64(const __m128& v) {
uint16_t float_to_half(float value);
float half_to_float(uint16_t value);
// http://locklessinc.com/articles/sat_arithmetic/
// https://locklessinc.com/articles/sat_arithmetic/
template <typename T>
inline T sat_add(T a, T b) {
using TU = std::make_unsigned<T>::type;
using TU = typename std::make_unsigned<T>::type;
TU result = TU(a) + TU(b);
if (std::is_unsigned<T>::value) {
result |= TU(-static_cast<std::make_signed<T>::type>(result < TU(a)));
result |=
TU(-static_cast<typename std::make_signed<T>::type>(result < TU(a)));
} else {
TU overflowed =
(TU(a) >> (sizeof(T) * 8 - 1)) + std::numeric_limits<T>::max();
@ -321,10 +322,11 @@ inline T sat_add(T a, T b) {
}
template <typename T>
inline T sat_sub(T a, T b) {
using TU = std::make_unsigned<T>::type;
using TU = typename std::make_unsigned<T>::type;
TU result = TU(a) - TU(b);
if (std::is_unsigned<T>::value) {
result &= TU(-static_cast<std::make_signed<T>::type>(result <= TU(a)));
result &=
TU(-static_cast<typename std::make_signed<T>::type>(result <= TU(a)));
} else {
TU overflowed =
(TU(a) >> (sizeof(T) * 8 - 1)) + std::numeric_limits<T>::max();