41 #define __clamp(val, lo, hi)	\  argument
42 	((val) >= (hi) ? (hi) : ((val) <= (lo) ? (lo) : (val)))
44 #define __clamp_once(val, lo, hi, unique_val, unique_lo, unique_hi) ({	\  argument
47 		typeof(hi) unique_hi = (hi);				\
50 #define __clamp_input_check(lo, hi)					\  argument
52                 __is_constexpr((lo) > (hi)), (lo) > (hi), false)))
54 #define __careful_clamp(val, lo, hi) ({					\  argument
55 	__clamp_input_check(lo, hi) +					\
56 	__builtin_choose_expr(__typecheck(val, lo) && __typecheck(val, hi) && \
57 			      __typecheck(hi, lo) && __is_constexpr(val) && \
58 			      __is_constexpr(lo) && __is_constexpr(hi),	\
59 		__clamp(val, lo, hi),					\
60 		__clamp_once(val, lo, hi, __UNIQUE_ID(__val),		\
112 #define clamp(val, lo, hi) __careful_clamp(val, lo, hi)  argument
211 #define clamp_t(type, val, lo, hi) __careful_clamp((type)(val), (type)(lo), (type)(hi))  argument
224 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)  argument