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#define a_barrier() (__sync_synchronize())
#define a_cas(p, t, s) (__sync_val_compare_and_swap((p), (t), (s)))
#define a_crash() (__builtin_trap())
#define a_clz_32 __builtin_clz
#define a_clz_64 __builtin_clzll
#define a_ctz_32 __builtin_ctz
#define a_ctz_64 __builtin_ctzll
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