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Fix system time wraparound

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Implement utils::udiv128, utils::div128
This commit is contained in:
Nekotekina 2019-08-30 19:47:31 +03:00
parent 7f99de36c1
commit 81a110f346
2 changed files with 60 additions and 3 deletions
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52
Utilities/asm.h
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@ -174,6 +174,32 @@ namespace utils
return (x * y) >> 64;
}
constexpr s64 div128(s64 high, s64 low, s64 divisor, s64* remainder = nullptr)
{
const __int128_t x = (__uint128_t{u64(high)} << 64) | u64(low);
const __int128_t r = x / divisor;
if (remainder)
{
*remainder = x % divisor;
}
return r;
}
constexpr u64 udiv128(u64 high, u64 low, u64 divisor, u64* remainder = nullptr)
{
const __uint128_t x = (__uint128_t{high} << 64) | low;
const __uint128_t r = x / divisor;
if (remainder)
{
*remainder = x % divisor;
}
return r;
}
#elif defined(_MSC_VER)
inline u8 rol8(u8 x, u8 n)
{
@ -224,5 +250,31 @@ namespace utils
{
return __mulh(x, y);
}
inline s64 div128(s64 high, s64 low, s64 divisor, s64* remainder = nullptr)
{
s64 rem;
s64 r = _div128(high, low, divisor, &rem);
if (remainder)
{
*remainder = rem;
}
return r;
}
inline u64 udiv128(u64 high, u64 low, u64 divisor, u64* remainder = nullptr)
{
u64 rem;
u64 r = _udiv128(high, low, divisor, &rem);
if (remainder)
{
*remainder = rem;
}
return r;
}
#endif
} // namespace utils