[FFmpeg-cvslog] avcodec/hevcdsp: optimize pixel comparison in sao_edge_filter

James Almer git at videolan.org
Mon Feb 16 21:48:25 CET 2015


ffmpeg | branch: master | James Almer <jamrial at gmail.com> | Mon Feb 16 16:53:31 2015 -0300| [22596383f3b8c7cd8a06570957face3875a73d3b] | committer: James Almer

avcodec/hevcdsp: optimize pixel comparison in sao_edge_filter

GCC 4.9.2 on a Core i5-4200U @ 1.60GHz, Linux x86_64

Before
715487 decicycles in sao_edge_filter_8, 262144 runs, 0 skips

After
672104 decicycles in sao_edge_filter_8, 262144 runs, 0 skips

Reviewed-by: Michael Niedermayer <michaelni at gmx.at>
Signed-off-by: James Almer <jamrial at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=22596383f3b8c7cd8a06570957face3875a73d3b
---

 libavcodec/hevcdsp_template.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/hevcdsp_template.c b/libavcodec/hevcdsp_template.c
index 9ce7bf2..aeb142c 100644
--- a/libavcodec/hevcdsp_template.c
+++ b/libavcodec/hevcdsp_template.c
@@ -325,7 +325,7 @@ static void FUNC(sao_band_filter_0)(uint8_t *_dst, uint8_t *_src,
     }
 }
 
-#define CMP(a, b) ((a) > (b) ? 1 : ((a) == (b) ? 0 : -1))
+#define CMP(a, b) ((a > b) - (a < b))
 
 static void FUNC(sao_edge_filter)(uint8_t *_dst, uint8_t *_src, ptrdiff_t stride_dst, int16_t *sao_offset_val,
                                   int eo, int width, int height) {



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