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u128: add multiplication support (for MSVC)

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Nekotekina 2021-04-24 19:05:24 +03:00
parent b704cc8375
commit 4d9a167f56
1 changed files with 26 additions and 0 deletions
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26
rpcs3/util/types.hpp
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@ -204,6 +204,7 @@ extern "C"
uchar _subborrow_u64(uchar, u64, u64, u64*);
u64 __shiftleft128(u64, u64, uchar);
u64 __shiftright128(u64, u64, uchar);
u64 _umul128(u64, u64, u64*);
}
// Unsigned 128-bit integer implementation (TODO)
@ -251,6 +252,13 @@ struct alignas(16) u128
return value;
}
constexpr friend u128 operator*(const u128& l, const u128& r)
{
u128 value = l;
value *= r;
return value;
}
constexpr u128 operator+() const
{
return *this;
@ -365,6 +373,24 @@ struct alignas(16) u128
return *this;
}
constexpr u128& operator*=(const u128& r)
{
const u64 _hi = r.hi * lo + r.lo * hi;
if (std::is_constant_evaluated())
{
hi = (lo >> 32) * (r.lo >> 32) + (((lo >> 32) * (r.lo & 0xffffffff)) >> 32) + (((r.lo >> 32) * (lo & 0xffffffff)) >> 32);
lo = lo * r.lo;
}
else
{
lo = _umul128(lo, r.lo, &hi);
}
hi += _hi;
return *this;
}
constexpr u128& operator<<=(const u128& r)
{
if (std::is_constant_evaluated())