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#define a_ll a_ll
static inline int a_ll(volatile int *p)
{
int v;
__asm__ __volatile__ ("ldaxr %w0,%1" : "=r"(v) : "Q"(*p));
return v;
}
#define a_sc a_sc
static inline int a_sc(volatile int *p, int v)
{
int r;
__asm__ __volatile__ ("stlxr %w0,%w1,%2" : "=&r"(r) : "r"(v), "Q"(*p) : "memory");
return !r;
}
#define a_barrier a_barrier
static inline void a_barrier()
{
__asm__ __volatile__ ("dmb ish" : : : "memory");
}
#define a_cas a_cas
static inline int a_cas(volatile int *p, int t, int s)
{
int old;
do {
old = a_ll(p);
if (old != t) {
a_barrier();
break;
}
} while (!a_sc(p, s));
return old;
}
static inline void *a_ll_p(volatile void *p)
{
void *v;
__asm__ __volatile__ ("ldaxr %0, %1" : "=r"(v) : "Q"(*(void *volatile *)p));
return v;
}
static inline int a_sc_p(volatile int *p, void *v)
{
int r;
__asm__ __volatile__ ("stlxr %w0,%1,%2" : "=&r"(r) : "r"(v), "Q"(*(void *volatile *)p) : "memory");
return !r;
}
#define a_cas_p a_cas_p
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
void *old;
do {
old = a_ll_p(p);
if (old != t) {
a_barrier();
break;
}
} while (!a_sc_p(p, s));
return old;
}
#define a_ctz_64 a_ctz_64
static inline int a_ctz_64(uint64_t x)
{
__asm__(
" rbit %0, %1\n"
" clz %0, %0\n"
: "=r"(x) : "r"(x));
return x;
}
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