34 int _atomic_xchg(int *ptr, int n);
37 int _atomic_cmpxchg(int *ptr, int o, int n);
43 #define xchg(ptr, n)							\  argument
45 		if (sizeof(*(ptr)) != 4)				\
48 		(typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n));	\
51 #define cmpxchg(ptr, o, n)						\  argument
53 		if (sizeof(*(ptr)) != 4)				\
56 		(typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o,	\
60 #define xchg64(ptr, n)							\  argument
62 		if (sizeof(*(ptr)) != 8)				\
65 		(typeof(*(ptr)))_atomic64_xchg((long long *)(ptr),	\
69 #define cmpxchg64(ptr, o, n)						\  argument
71 		if (sizeof(*(ptr)) != 8)				\
74 		(typeof(*(ptr)))_atomic64_cmpxchg((long long *)ptr,	\
80 #define xchg(ptr, n)							\  argument
82 		typeof(*(ptr)) __x;					\
84 		switch (sizeof(*(ptr))) {				\
87 				__insn_exch4((ptr),			\
92 				__insn_exch((ptr), (unsigned long)(n));	\
102 #define cmpxchg(ptr, o, n)						\  argument
104 		typeof(*(ptr)) __x;					\
107 		switch (sizeof(*(ptr))) {				\
110 				__insn_cmpexch4((ptr),			\
114 			__x = (typeof(__x))__insn_cmpexch((ptr),	\
130 #define tas(ptr) xchg((ptr), 1)  argument