No benchmark because this is not used in any speed relevant pathes nor is it
used where __builtin_add_overflow is available.
So I do not know how to realistically benchmark it.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
int64_t tmp;
return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
#else
- if (b >= 0 && a >= INT64_MAX - b)
- return INT64_MAX;
- if (b <= 0 && a <= INT64_MIN - b)
- return INT64_MIN;
- return a + b;
+ int64_t s = a+(uint64_t)b;
+ if ((int64_t)(a^b | ~s^b) >= 0)
+ return INT64_MAX ^ (b >> 63);
+ return s;
#endif
}