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| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-10-30 14:21:15 -0400 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-11-12 00:00:57 +0100 |
| commit | 476ddffccbede4fdd3272b174b8f63a2e8125c8b (patch) | |
| tree | 7dd9354073a0b2c110f412c42298716f7241777a /doc/ffmpeg.txt | |
| parent | b533998d0a1da259b08c21a48de9cedb3e262348 (diff) | |
| download | ffmpeg-476ddffccbede4fdd3272b174b8f63a2e8125c8b.tar.gz | |
avutil/common: add FFDIFFSIGN macro
This is of use for defining comparator callbacks. Common approaches like
return x-y are not safe due to the risks of overflow.
Furthermore, the (x > y) - (x < y) trick is optimized to branchless
code.
This also documents this macro accordingly.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
(cherry picked from commit 265f83fd35977a80e93b3cc13ceb65f52f129a3c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'doc/ffmpeg.txt')
0 files changed, 0 insertions, 0 deletions