60 #define __clamp(val, lo, hi)	\  argument
61 	((val) >= (hi) ? (hi) : ((val) <= (lo) ? (lo) : (val)))
63 #define __clamp_once(val, lo, hi, unique_val, unique_lo, unique_hi) ({		\  argument
66 	typeof(hi) unique_hi = (hi);						\
67 	static_assert(__builtin_choose_expr(__is_constexpr((lo) > (hi)), 	\
68 			(lo) <= (hi), true),					\
69 		"clamp() low limit " #lo " greater than high limit " #hi);	\
71 	static_assert(__types_ok(val, hi), "clamp() 'hi' signedness error");	\
74 #define __careful_clamp(val, lo, hi) ({					\  argument
75 	__builtin_choose_expr(__is_constexpr((val) - (lo) + (hi)),	\
76 		__clamp(val, lo, hi),					\
77 		__clamp_once(val, lo, hi, __UNIQUE_ID(__val),		\
146 #define clamp(val, lo, hi) __careful_clamp(val, lo, hi)  argument
224 #define clamp_t(type, val, lo, hi) __careful_clamp((type)(val), (type)(lo), (type)(hi))  argument
237 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)  argument