On Mon, 25 Jul 2022, Hubert Mazur wrote:
Provide neon implementation for sse16 function.
Performance comparison tests are shown below.
- sse_0_c: 273.0
- sse_0_neon: 48.2
Benchmarks and tests run with checkasm tool on AWS Graviton 3.
Signed-off-by: Hubert Mazur <[email protected]>
---
libavcodec/aarch64/me_cmp_init_aarch64.c | 4 ++
libavcodec/aarch64/me_cmp_neon.S | 82 ++++++++++++++++++++++++
2 files changed, 86 insertions(+)
+// iterate by one
+2:
+
+ ld1 {v0.16b}, [x1], x3 // Load pix1
+ ld1 {v1.16b}, [x2], x3 // Load pix2
+
+ uabd v30.16b, v0.16b, v1.16b
+ umull v29.8h, v0.8b, v1.8b
+ umull2 v28.8h, v0.16b, v1.16b
This should probably be using v30 instead of v0/v1 in the umull here.
The whole codepath for non-modulo-4 heights is untested in practice. You
can apply the patches from
https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=7028 to make
checkasm test it, so please make sure that the uncommon codepaths in the
patches do work too.
// Martin
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