#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,%w2,%1" : "=&r"(r), "=Q"(*p) : "r"(v) : "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; } #define a_ll_p a_ll_p static inline void *a_ll_p(volatile void *p) { void *v; __asm__ __volatile__ ("ldaxr %0, %1" : "=r"(v) : "Q"(*(void *volatile *)p)); return v; } #define a_sc_p a_sc_p static inline int a_sc_p(volatile int *p, void *v) { int r; __asm__ __volatile__ ("stlxr %w0,%2,%1" : "=&r"(r), "=Q"(*(void *volatile *)p) : "r"(v) : "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; } #define a_clz_64 a_clz_64 static inline int a_clz_64(uint64_t x) { __asm__("clz %0, %1" : "=r"(x) : "r"(x)); return x; }