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avutil/common: Implement av_sat_add64_c() with fewer branches 

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>
This commit is contained in:
Michael Niedermayer 2020-10-19 10:20:26 +02:00
parent bca0735be5
commit 4e9514e99b
1 changed files with 4 additions and 5 deletions
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9
libavutil/common.h
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@ -303,11 +303,10 @@ static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
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
}