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t-nissie/saturated.c

Last active November 17, 2016 04:29
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Qiitaの卜部昌平著『Cで飽和++』のコードのコピペ
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saturated.c
/* saturated_inc(x) http://qiita.com/shyouhei/items/e960e641882da80c8932 */
#if __GNUC__ >= 7
# define saturated_inc(x) __builtin_add_overflow_p(x, 1, x) ? x : ++x
#else
# define saturated_inc(x) ({__typeof__(x) y; __builtin_add_overflow(x, 1, &y) ? x : ++x; })
#endif
signed long long
func(signed long long x)
{
return saturated_inc(x);
}
//Local variables:
//compile-command: "gcc -O3 -S -o- saturated.c"
//End:
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