ffmpeg | branch: master | Hubert Mazur <h...@semihalf.com> | Thu Sep 8 11:25:04 2022 +0200| [c495a4b32d352e087318d3a09a9bb4f2b55cfa04] | committer: Martin Storsjö
lavc/aarch64: Add neon implementation of vsse16 Provide optimized implementation of vsse16 for arm64. Performance comparison tests are shown below. - vsse_0_c: 257.7 - vsse_0_neon: 59.2 Benchmarks and tests are run with checkasm tool on AWS Graviton 3. Signed-off-by: Hubert Mazur <h...@semihalf.com> Signed-off-by: Martin Storsjö <mar...@martin.st> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c495a4b32d352e087318d3a09a9bb4f2b55cfa04 --- libavcodec/aarch64/me_cmp_init_aarch64.c | 4 ++ libavcodec/aarch64/me_cmp_neon.S | 87 ++++++++++++++++++++++++++++++++ 2 files changed, 91 insertions(+) diff --git a/libavcodec/aarch64/me_cmp_init_aarch64.c b/libavcodec/aarch64/me_cmp_init_aarch64.c index ddc5d05611..7b81e48d16 100644 --- a/libavcodec/aarch64/me_cmp_init_aarch64.c +++ b/libavcodec/aarch64/me_cmp_init_aarch64.c @@ -43,6 +43,8 @@ int sse4_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2, int vsad16_neon(MpegEncContext *c, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride, int h); +int vsse16_neon(MpegEncContext *c, const uint8_t *s1, const uint8_t *s2, + ptrdiff_t stride, int h); av_cold void ff_me_cmp_init_aarch64(MECmpContext *c, AVCodecContext *avctx) { @@ -62,5 +64,7 @@ av_cold void ff_me_cmp_init_aarch64(MECmpContext *c, AVCodecContext *avctx) c->sse[2] = sse4_neon; c->vsad[0] = vsad16_neon; + + c->vsse[0] = vsse16_neon; } } diff --git a/libavcodec/aarch64/me_cmp_neon.S b/libavcodec/aarch64/me_cmp_neon.S index 1d0b166d69..b3f376aa60 100644 --- a/libavcodec/aarch64/me_cmp_neon.S +++ b/libavcodec/aarch64/me_cmp_neon.S @@ -649,3 +649,90 @@ function vsad16_neon, export=1 ret endfunc + +function vsse16_neon, export=1 + // x0 unused + // x1 uint8_t *pix1 + // x2 uint8_t *pix2 + // x3 ptrdiff_t stride + // w4 int h + + ld1 {v0.16b}, [x1], x3 // Load pix1[0], first iteration + ld1 {v1.16b}, [x2], x3 // Load pix2[0], first iteration + + sub w4, w4, #1 // we need to make h-1 iterations + movi v16.4s, #0 + movi v17.4s, #0 + + cmp w4, #3 // check if we can make 3 iterations at once + usubl v31.8h, v0.8b, v1.8b // Signed difference of pix1[0] - pix2[0], first iteration + usubl2 v30.8h, v0.16b, v1.16b // Signed difference of pix1[0] - pix2[0], first iteration + b.le 2f + + +1: + // x = abs(pix1[0] - pix2[0] - pix1[0 + stride] + pix2[0 + stride]) + // res = (x) * (x) + ld1 {v0.16b}, [x1], x3 // Load pix1[0 + stride], first iteration + ld1 {v1.16b}, [x2], x3 // Load pix2[0 + stride], first iteration + ld1 {v2.16b}, [x1], x3 // Load pix1[0 + stride], second iteration + ld1 {v3.16b}, [x2], x3 // Load pix2[0 + stride], second iteration + usubl v29.8h, v0.8b, v1.8b + usubl2 v28.8h, v0.16b, v1.16b + ld1 {v4.16b}, [x1], x3 // Load pix1[0 + stride], third iteration + ld1 {v5.16b}, [x2], x3 // Load pix1[0 + stride], third iteration + sabd v31.8h, v31.8h, v29.8h + sabd v30.8h, v30.8h, v28.8h + usubl v27.8h, v2.8b, v3.8b + usubl2 v26.8h, v2.16b, v3.16b + usubl v25.8h, v4.8b, v5.8b + usubl2 v24.8h, v4.16b, v5.16b + sabd v29.8h, v29.8h, v27.8h + sabd v27.8h, v27.8h, v25.8h + umlal v16.4s, v31.4h, v31.4h + umlal2 v17.4s, v31.8h, v31.8h + sabd v28.8h, v28.8h, v26.8h + sabd v26.8h, v26.8h, v24.8h + umlal v16.4s, v30.4h, v30.4h + umlal2 v17.4s, v30.8h, v30.8h + mov v31.16b, v25.16b + umlal v16.4s, v29.4h, v29.4h + umlal2 v17.4s, v29.8h, v29.8h + mov v30.16b, v24.16b + umlal v16.4s, v28.4h, v28.4h + umlal2 v17.4s, v28.8h, v28.8h + sub w4, w4, #3 + umlal v16.4s, v27.4h, v27.4h + umlal2 v17.4s, v27.8h, v27.8h + cmp w4, #3 + umlal v16.4s, v26.4h, v26.4h + umlal2 v17.4s, v26.8h, v26.8h + + b.ge 1b + + cbz w4, 3f + +// iterate by once +2: + ld1 {v0.16b}, [x1], x3 + ld1 {v1.16b}, [x2], x3 + subs w4, w4, #1 + usubl v29.8h, v0.8b, v1.8b + usubl2 v28.8h, v0.16b, v1.16b + sabd v31.8h, v31.8h, v29.8h + sabd v30.8h, v30.8h, v28.8h + umlal v16.4s, v31.4h, v31.4h + umlal2 v17.4s, v31.8h, v31.8h + mov v31.16b, v29.16b + umlal v16.4s, v30.4h, v30.4h + umlal2 v17.4s, v30.8h, v30.8h + mov v30.16b, v28.16b + b.ne 2b + +3: + add v16.4s, v16.4s, v17.4s + uaddlv d17, v16.4s + fmov w0, s17 + + ret +endfunc _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
