#include <stdio.h>
#include <stdlib.h>

#define __is_constexpr(x) \
	(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))

#define __no_side_effects(x, y) \
		(__is_constexpr(x) && __is_constexpr(y))

#define __typecheck(x, y) \
		(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))

#define __safe_cmp(x, y) \
		(__typecheck(x, y) && __no_side_effects(x, y))

#define __cmp(x, y, op)	((x) op (y) ? (x) : (y))

#define __cmp_once(x, y, op) ({		\
		typeof(x) __x = (x);	\
		typeof(y) __y = (y);	\
		__cmp(__x, __y, op); })

#define __careful_cmp(x, y, op)				\
		__builtin_choose_expr(__safe_cmp(x, y),	\
				      __cmp(x, y, op), __cmp_once(x, y, op))

#define min(x, y)	__careful_cmp(x, y, <)

#define min_not_zero(x, y) ({			\
	typeof(x) __x = (x);			\
	typeof(y) __y = (y);			\
	__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })

int main(int argc, char *argv[])
{
	int val1, val2;

	if (argc < 3) {
		printf("%s val1 val2\n", argv[0]);
		return 1;
	}

	val1 = atoi(argv[1]);
	val2 = atoi(argv[2]);
	printf("min_not_zero(%d, %d) = %d\n", val1, val2, min_not_zero(val1, val2));
	return 0;
}