Resort to GCC built-in for atomic_add()

This commit is contained in:
Andreas Öman 2009-12-15 16:23:52 +00:00
parent 9a7bbabc47
commit a95da156d3

View file

@ -19,44 +19,10 @@
#ifndef HTSATOMIC_H__
#define HTSATOMIC_H__
/**
* Atomically add 'incr' to *ptr and return the previous value
*/
#if defined(__i386__) || defined(__x86_64__)
static inline int
atomic_add(volatile int *ptr, int incr)
{
int r;
asm volatile("lock; xaddl %0, %1" :
"=r"(r), "=m"(*ptr) : "0" (incr), "m" (*ptr) : "memory");
return r;
}
#elif defined(__ppc__) || defined(__PPC__)
/* somewhat based on code from darwin gcc */
static inline int
atomic_add (volatile int *ptr, int incr)
{
int tmp, res;
asm volatile("0:\n"
"lwarx %1,0,%2\n"
"add%I3 %0,%1,%3\n"
"stwcx. %0,0,%2\n"
"bne- 0b\n"
: "=&r"(tmp), "=&b"(res)
: "r" (ptr), "Ir"(incr)
: "cr0", "memory");
return res;
}
#else
static inline int
atomic_add(volatile int *ptr, int incr)
{
return __sync_fetch_and_add(ptr, incr);
}
#endif
#endif /* HTSATOMIC_H__ */