On Fri, 31 Jan 2025, Krzysztof Pyrkosz via ffmpeg-devel wrote:
The benchmarks (before vs after) were gathered using
./tests/checkasm/checkasm --test=sw_scale --bench --runs=6 | grep yuv2yuv1
Thanks for the numbers! To keep it more readable and concise, we'd only
need to see the numbers for the _neon versions here - and we probably
don't need to see all the variants/combinations of it, just one or a
couple would be fine.
Anyway, the numbers look great, thanks!
yuv2yuv1_16_512_accurate_c: 1439.9 ( 1.00x)
yuv2yuv1_16_512_accurate_neon: 77.6 (18.55x)
yuv2yuv1_16_512_approximate_c: 1422.1 ( 1.00x)
yuv2yuv1_16_512_approximate_neon: 78.1 (18.20x)
yuv2yuv1_19_512_accurate_c: 1447.1 ( 1.00x)
yuv2yuv1_19_512_accurate_neon: 78.1 (18.52x)
yuv2yuv1_19_512_approximate_c: 1474.4 ( 1.00x)
yuv2yuv1_19_512_approximate_neon: 78.1 (18.87x)
Krzysztof
---
libswscale/aarch64/output.S | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
Your signature above does get included as part of the commit message,
while it's probably not needed/intended :-) I'm editing it out before
merging though.
(I also end up needing to apply your actual email address and name, as the
mailing list adds the "via ffmpeg-devel" to the name and rewrites the from
address. But that's obviously outside of your control.)
diff --git a/libswscale/aarch64/output.S b/libswscale/aarch64/output.S
index 934d62dfd0..190c438870 100644
--- a/libswscale/aarch64/output.S
+++ b/libswscale/aarch64/output.S
@@ -214,21 +214,15 @@ function ff_yuv2plane1_8_neon, export=1
and w4, w4, #7
cbz w4, 1f // check if offsetting
present
ext v0.8b, v0.8b, v0.8b, #3 // honor offsetting
which can be 0 or 3 only
-1: uxtl v0.8h, v0.8b // extend dither to
32-bit
- uxtl v1.4s, v0.4h
- uxtl2 v2.4s, v0.8h
+1:
+ uxtl v0.8h, v0.8b // extend dither to
32-bit
2:
ld1 {v3.8h}, [x0], #16 // read 8x16-bit @
src[j ][i + {0..7}]: A,B,C,D,E,F,G,H
- sxtl v4.4s, v3.4h
- sxtl2 v5.4s, v3.8h
- add v4.4s, v4.4s, v1.4s
- add v5.4s, v5.4s, v2.4s
- sqshrun v4.4h, v4.4s, #6
- sqshrun2 v4.8h, v5.4s, #6
-
- uqshrn v3.8b, v4.8h, #1 // clip8(val>>7)
subs w2, w2, #8 // dstW -= 8
- st1 {v3.8b}, [x1], #8 // write to destination
+ shadd v1.8h, v0.8h, v3.8h // v1 = (v0 + v3) >> 1
+ sqshrun v2.8b, v1.8h, #6 // clip_uint8(v1 >> 6)
+
+ st1 {v2.8b}, [x1], #8 // write to destination
b.gt 2b // loop until width
consumed
ret
endfunc
--
Thanks, these changes look good - will push.
// Martin
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