diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/internal/atomic.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/internal/atomic.h b/src/internal/atomic.h index 6f37d252..ab473dd7 100644 --- a/src/internal/atomic.h +++ b/src/internal/atomic.h @@ -277,6 +277,27 @@ static inline int a_ctz_64(uint64_t x) } #endif +#ifndef a_clz_64 +#define a_clz_64 a_clz_64 +static inline int a_clz_64(uint64_t x) +{ +#ifdef a_clz_32 + if (x>>32) + return a_clz_32(x>>32); + return a_clz_32(x) + 32; +#else + uint32_t y; + int r; + if (x>>32) y=x>>32, r=0; else y=x, r=32; + if (y>>16) y>>=16; else r |= 16; + if (y>>8) y>>=8; else r |= 8; + if (y>>4) y>>=4; else r |= 4; + if (y>>2) y>>=2; else r |= 2; + return r | !(y>>1); +#endif +} +#endif + #ifndef a_ctz_l #define a_ctz_l a_ctz_l static inline int a_ctz_l(unsigned long x) |