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Simplify utils::umulh64 (MSVC)

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Nekotekina 2021-04-29 00:10:38 +03:00
parent 703ec474f5
commit b1736b6411
1 changed files with 3 additions and 10 deletions
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13
rpcs3/util/asm.hpp
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@ -249,20 +249,13 @@ namespace utils
{ {
#ifdef _MSC_VER #ifdef _MSC_VER
if (std::is_constant_evaluated()) if (std::is_constant_evaluated())
#endif
{ {
u128 a = (u32)x * (u64)(u32)y; return static_cast<u64>((u128{x} * u128{y}) >> 64);
u128 b = (x >> 32) * (u32)y;
u128 c = (u32)x * (y >> 32);
u128 d = (x >> 32) * (y >> 32);
a += (b << 32);
a += (c << 32);
a.hi += d.lo;
return a.hi;
} }
#ifdef _MSC_VER
return __umulh(x, y); return __umulh(x, y);
#else
return (u128{x} * u128{y}) >> 64;
#endif #endif
} }