ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Mon Oct 19 10:20:26 2020 +0200| [4e9514e99bf77bb3d1437e992c3e08ca7d1ebc46] | committer: Michael Niedermayer
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 <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4e9514e99bf77bb3d1437e992c3e08ca7d1ebc46 --- libavutil/common.h | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/libavutil/common.h b/libavutil/common.h index 92b721a59c..b9fbcc4d60 100644 --- a/libavutil/common.h +++ b/libavutil/common.h @@ -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 } _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
