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add GCC/clang implementations of 64*64->128 multiply for x86_64, and adjust some integer casts

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This commit is contained in:
Vas Crabb 2019-02-16 18:03:53 +11:00
parent a7c5845317
commit 05d0305c08
2 changed files with 40 additions and 4 deletions
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34
src/osd/eigccx86.h
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@ -456,6 +456,40 @@ _recip_approx(float value)
#endif
/*-------------------------------------------------
mul_64x64 - perform a signed 64 bit x 64 bit
multiply and return the full 128 bit result
-------------------------------------------------*/
#ifdef __x86_64__
#define mul_64x64 _mul_64x64
inline int64_t ATTR_FORCE_INLINE
_mul_64x64(int64_t a, int64_t b, int64_t *hi)
{
__int128 const r(__int128(a) * b);
*hi = int64_t(uint64_t((unsigned __int128)r >> 64));
return int64_t(uint64_t((unsigned __int128)r));
}
#endif
/*-------------------------------------------------
mulu_64x64 - perform an unsigned 64 bit x 64
bit multiply and return the full 128 bit result
-------------------------------------------------*/
#ifdef __x86_64__
#define mulu_64x64 _mulu_64x64
inline uint64_t ATTR_FORCE_INLINE
_mulu_64x64(uint64_t a, uint64_t b, uint64_t *hi)
{
unsigned __int128 const r((unsigned __int128)a * b);
*hi = uint64_t(r >> 64);
return uint64_t(r);
}
#endif
/***************************************************************************
INLINE BIT MANIPULATION FUNCTIONS

10
src/osd/eminline.h
View File

@ -268,10 +268,10 @@ inline float recip_approx(float value)
#ifndef mul_64x64
inline int64_t mul_64x64(int64_t a, int64_t b, int64_t *hi)
{
uint64_t const a_hi = uint32_t(a >> 32);
uint64_t const b_hi = uint32_t(b >> 32);
uint64_t const a_lo = uint32_t(a);
uint64_t const b_lo = uint32_t(b);
uint64_t const a_hi = uint64_t(a) >> 32;
uint64_t const b_hi = uint64_t(b) >> 32;
uint64_t const a_lo = uint32_t(uint64_t(a));
uint64_t const b_lo = uint32_t(uint64_t(b));
uint64_t const ab_lo = a_lo * b_lo;
uint64_t const ab_m1 = a_hi * b_lo;
@ -317,6 +317,8 @@ inline uint64_t mulu_64x64(uint64_t a, uint64_t b, uint64_t *hi)
}
#endif
/***************************************************************************
INLINE BIT MANIPULATION FUNCTIONS
***************************************************************************/