include/linux/minmax.h

1 /* SPDX-License-Identifier: GPL-2.0 */
13  * - Avoid multiple evaluations of the arguments (so side-effects like
14  *   "x++" happen only once) when non-constant.
15  * - Retain result as a constant expressions when called with only
18  * - Perform signed v unsigned type-checking (to generate compile
20  * - Unsigned char/short are always promoted to signed int and can be
22  * - Unsigned arguments can be compared against non-negative signed constants.
23  * - Comparison of a signed argument against an unsigned constant fails
34 /* True for a non-negative signed int constant */
36 	(__builtin_choose_expr(__is_constexpr(x) && __is_signed(x), x, -1) >= 0)
56 	__builtin_choose_expr(__is_constexpr((x) - (y)),	\
75 	__builtin_choose_expr(__is_constexpr((val) - (lo) + (hi)),	\
81  * min - return minimum of two values of the same or compatible types
88  * max - return maximum of two values of the same or compatible types
95  * umin - return minimum of two non-negative values
104  * umax - return maximum of two non-negative values
112  * min3 - return minimum of three values
120  * max3 - return maximum of three values
128  * min_not_zero - return the minimum that is _not_ zero, unless both are zero
138  * clamp - return a value clamped to a given range with strict typechecking
156  * min_t - return minimum of two values, using the specified type
164  * max_t - return maximum of two values, using the specified type
173  * In the following legit use-case where the "array" passed is a simple pointer,
175  * --- 8< ---
179  * --- 8< ---
191 	__unqual_scalar_typeof(__array[0]) __element = __array[--__len];\
192 	while (__len--)							\
197  * min_array - return minimum of values present in an array
206  * max_array - return maximum of values present in an array
215  * clamp_t - return a value clamped to a given range using a given type
227  * clamp_val - return a value clamped to a given range using val's type
241 	return (val - start) < len;  in in_range64()
246 	return (val - start) < len;  in in_range32()
250  * in_range - Determine if a value lies within a range.
266  * swap - swap values of @a and @b