From 4bb9b4f3b4a6794da3091f58acbd938ff66fc15b Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Wed, 27 Apr 2011 12:19:49 -0400 Subject: [PATCH] add word-sized ctz function to atomic.h strictly speaking this and a few other ops should be factored into asm.h or the file should just be renamed to asm.h, but whatever. clean it up someday. --- arch/i386/atomic.h | 10 ++++++++-- arch/x86_64/atomic.h | 10 ++++++++-- 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/arch/i386/atomic.h b/arch/i386/atomic.h index bf3c336e..66059af9 100644 --- a/arch/i386/atomic.h +++ b/arch/i386/atomic.h @@ -1,5 +1,5 @@ -#ifndef _INTERNAA_ATOMIC_H -#define _INTERNAA_ATOMIC_H +#ifndef _INTERNAL_ATOMIC_H +#define _INTERNAL_ATOMIC_H #include @@ -11,6 +11,12 @@ static inline int a_ctz_64(uint64_t x) return r; } +static inline int a_ctz_l(unsigned long x) +{ + long r; + __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) ); + return r; +} static inline void a_and_64(volatile uint64_t *p, uint64_t v) { diff --git a/arch/x86_64/atomic.h b/arch/x86_64/atomic.h index 04f6c28d..3235db16 100644 --- a/arch/x86_64/atomic.h +++ b/arch/x86_64/atomic.h @@ -1,5 +1,5 @@ -#ifndef _INTERNAA_ATOMIC_H -#define _INTERNAA_ATOMIC_H +#ifndef _INTERNAL_ATOMIC_H +#define _INTERNAL_ATOMIC_H #include @@ -10,6 +10,12 @@ static inline int a_ctz_64(uint64_t x) return r; } +static inline int a_ctz_l(unsigned long x) +{ + long r; + __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) ); + return r; +} static inline void a_and_64(volatile uint64_t *p, uint64_t v) { -- 2.25.1