rpcs3/Utilities/asm.h
2020-04-14 19:45:53 +03:00

216 lines
3.8 KiB
C++

#pragma once
#include "types.h"
namespace utils
{
// Rotate helpers
#if defined(__GNUG__)
inline u8 rol8(u8 x, u8 n)
{
#if __has_builtin(__builtin_rotateleft8)
return __builtin_rotateleft8(x, n);
#else
u8 result = x;
__asm__("rolb %[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u8 ror8(u8 x, u8 n)
{
#if __has_builtin(__builtin_rotateright8)
return __builtin_rotateright8(x, n);
#else
u8 result = x;
__asm__("rorb %[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u16 rol16(u16 x, u16 n)
{
#if __has_builtin(__builtin_rotateleft16)
return __builtin_rotateleft16(x, n);
#else
u16 result = x;
__asm__("rolw %b[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u16 ror16(u16 x, u16 n)
{
#if __has_builtin(__builtin_rotateright16)
return __builtin_rotateright16(x, n);
#else
u16 result = x;
__asm__("rorw %b[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u32 rol32(u32 x, u32 n)
{
#if __has_builtin(__builtin_rotateleft32)
return __builtin_rotateleft32(x, n);
#else
u32 result = x;
__asm__("roll %b[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u32 ror32(u32 x, u32 n)
{
#if __has_builtin(__builtin_rotateright32)
return __builtin_rotateright32(x, n);
#else
u32 result = x;
__asm__("rorl %b[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u64 rol64(u64 x, u64 n)
{
#if __has_builtin(__builtin_rotateleft64)
return __builtin_rotateleft64(x, n);
#else
u64 result = x;
__asm__("rolq %b[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
inline u64 ror64(u64 x, u64 n)
{
#if __has_builtin(__builtin_rotateright64)
return __builtin_rotateright64(x, n);
#else
u64 result = x;
__asm__("rorq %b[n], %[result]" : [result] "+g"(result) : [n] "c"(n));
return result;
#endif
}
constexpr u64 umulh64(u64 a, u64 b)
{
const __uint128_t x = a;
const __uint128_t y = b;
return (x * y) >> 64;
}
constexpr s64 mulh64(s64 a, s64 b)
{
const __int128_t x = a;
const __int128_t y = b;
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)
{
return _rotl8(x, n);
}
inline u8 ror8(u8 x, u8 n)
{
return _rotr8(x, n);
}
inline u16 rol16(u16 x, u16 n)
{
return _rotl16(x, (u8)n);
}
inline u16 ror16(u16 x, u16 n)
{
return _rotr16(x, (u8)n);
}
inline u32 rol32(u32 x, u32 n)
{
return _rotl(x, (int)n);
}
inline u32 ror32(u32 x, u32 n)
{
return _rotr(x, (int)n);
}
inline u64 rol64(u64 x, u64 n)
{
return _rotl64(x, (int)n);
}
inline u64 ror64(u64 x, u64 n)
{
return _rotr64(x, (int)n);
}
inline u64 umulh64(u64 x, u64 y)
{
return __umulh(x, y);
}
inline s64 mulh64(s64 x, s64 y)
{
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