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add word-sized ctz function to atomic.h

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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.
This commit is contained in:
Rich Felker 2011-04-27 12:19:49 -04:00
commit 4bb9b4f3b4
2 changed files with 16 additions and 4 deletions
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10
arch/i386/atomic.h
View file

@ -1,5 +1,5 @@
#ifndef _INTERNAA_ATOMIC_H #ifndef _INTERNAL_ATOMIC_H
#define _INTERNAA_ATOMIC_H #define _INTERNAL_ATOMIC_H
#include <stdint.h> #include <stdint.h>
@ -11,6 +11,12 @@ static inline int a_ctz_64(uint64_t x)
return r; 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) static inline void a_and_64(volatile uint64_t *p, uint64_t v)
{ {

10
arch/x86_64/atomic.h
View file

@ -1,5 +1,5 @@
#ifndef _INTERNAA_ATOMIC_H #ifndef _INTERNAL_ATOMIC_H
#define _INTERNAA_ATOMIC_H #define _INTERNAL_ATOMIC_H
#include <stdint.h> #include <stdint.h>
@ -10,6 +10,12 @@ static inline int a_ctz_64(uint64_t x)
return r; 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) static inline void a_and_64(volatile uint64_t *p, uint64_t v)
{ {