ffmpeg | branch: master | Jose Da Silva <[email protected]> | Sun Jan 31
19:51:04 2021 -0800| [8c3d31fbeee157d6f529402c86371c857026fcff] | committer:
Paul B Mahol
avcodec/xbmdec: convert() minor speed increase
If we test for {0..9} first, we have tested for 10/16th of all possible
characters first and avoid testing the remaining 6/16th of all possible
characters, which can be either 6/16th lowercase or 6/16th uppercase.
Signed-off-by: Joe Da Silva <[email protected]>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8c3d31fbeee157d6f529402c86371c857026fcff
---
libavcodec/xbmdec.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/libavcodec/xbmdec.c b/libavcodec/xbmdec.c
index b783d5abe5..52615dc7ab 100644
--- a/libavcodec/xbmdec.c
+++ b/libavcodec/xbmdec.c
@@ -28,12 +28,12 @@
static int convert(uint8_t x)
{
- if (x >= 'a')
- x -= 87;
- else if (x >= 'A')
- x -= 55;
- else
+ if (x <= '9')
x -= '0';
+ else if (x >= 'a')
+ x -= ('a' - 10);
+ else
+ x -= ('A' - 10);
return x;
}
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