diff options
Diffstat (limited to 'arch/i386/atomic_arch.h')
| -rw-r--r-- | arch/i386/atomic_arch.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/i386/atomic_arch.h b/arch/i386/atomic_arch.h index 2b1a0490..7d2a48a5 100644 --- a/arch/i386/atomic_arch.h +++ b/arch/i386/atomic_arch.h @@ -99,3 +99,10 @@ static inline int a_ctz_l(unsigned long x) __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) ); return r; } + +#define a_clz_32 a_clz_32 +static inline int a_clz_32(uint32_t x) +{ + __asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) ); + return x; +} |