[FFmpeg-devel] [PATCH v2 1/7] lavc/aarch64: Add neon implementation for pix_abs8 functions.
Grzegorz Bernacki
gjb at semihalf.com
Mon Oct 3 17:10:14 EEST 2022
Provide optimized implementation of pix_abs8 function for arm64.
Performance comparison tests are shown below:
pix_abs_1_1_c: 162.5
pix_abs_1_1_neon: 27.0
pix_abs_1_2_c: 174.0
pix_abs_1_2_neon: 23.5
pix_abs_1_3_c: 203.2
pix_abs_1_3_neon: 34.7
Benchmarks and tests are run with checkasm tool on AWS Graviton 3.
Signed-off-by: Grzegorz Bernacki <gjb at semihalf.com>
---
libavcodec/aarch64/me_cmp_init_aarch64.c | 9 ++
libavcodec/aarch64/me_cmp_neon.S | 193 +++++++++++++++++++++++
2 files changed, 202 insertions(+)
diff --git a/libavcodec/aarch64/me_cmp_init_aarch64.c b/libavcodec/aarch64/me_cmp_init_aarch64.c
index e143f0816e..695ed35fc1 100644
--- a/libavcodec/aarch64/me_cmp_init_aarch64.c
+++ b/libavcodec/aarch64/me_cmp_init_aarch64.c
@@ -59,6 +59,12 @@ int pix_median_abs16_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t
ptrdiff_t stride, int h);
int pix_median_abs8_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
ptrdiff_t stride, int h);
+int ff_pix_abs8_x2_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
+ ptrdiff_t stride, int h);
+int ff_pix_abs8_y2_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
+ ptrdiff_t stride, int h);
+int ff_pix_abs8_xy2_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
+ ptrdiff_t stride, int h);
av_cold void ff_me_cmp_init_aarch64(MECmpContext *c, AVCodecContext *avctx)
{
@@ -70,6 +76,9 @@ av_cold void ff_me_cmp_init_aarch64(MECmpContext *c, AVCodecContext *avctx)
c->pix_abs[0][2] = ff_pix_abs16_y2_neon;
c->pix_abs[0][3] = ff_pix_abs16_xy2_neon;
c->pix_abs[1][0] = ff_pix_abs8_neon;
+ c->pix_abs[1][1] = ff_pix_abs8_x2_neon;
+ c->pix_abs[1][2] = ff_pix_abs8_y2_neon;
+ c->pix_abs[1][3] = ff_pix_abs8_xy2_neon;
c->sad[0] = ff_pix_abs16_neon;
c->sad[1] = ff_pix_abs8_neon;
diff --git a/libavcodec/aarch64/me_cmp_neon.S b/libavcodec/aarch64/me_cmp_neon.S
index c710358ab7..43e068bb7f 100644
--- a/libavcodec/aarch64/me_cmp_neon.S
+++ b/libavcodec/aarch64/me_cmp_neon.S
@@ -119,6 +119,199 @@ function ff_pix_abs8_neon, export=1
ret
endfunc
+function ff_pix_abs8_x2_neon, export=1
+ // x0 unused
+ // x1 uint8_t *pix1
+ // x2 uint8_t *pix2
+ // x3 ptrdiff_t stride
+ // w4 int h
+
+ cmp w4, #4
+ movi v26.8h, #0
+ add x5, x2, #1 // pix2 + 1
+ b.lt 2f
+
+// make 4 iterations at once
+1:
+ ld1 {v1.8b}, [x2], x3
+ ld1 {v2.8b}, [x5], x3
+ ld1 {v0.8b}, [x1], x3
+ ld1 {v4.8b}, [x2], x3
+ urhadd v30.8b, v1.8b, v2.8b
+ ld1 {v5.8b}, [x5], x3
+ uabal v26.8h, v0.8b, v30.8b
+ ld1 {v6.8b}, [x1], x3
+ urhadd v29.8b, v4.8b, v5.8b
+ ld1 {v7.8b}, [x2], x3
+ ld1 {v20.8b}, [x5], x3
+ uabal v26.8h, v6.8b, v29.8b
+ ld1 {v21.8b}, [x1], x3
+ urhadd v28.8b, v7.8b, v20.8b
+ ld1 {v22.8b}, [x2], x3
+ ld1 {v23.8b}, [x5], x3
+ uabal v26.8h, v21.8b, v28.8b
+ sub w4, w4, #4
+ ld1 {v24.8b}, [x1], x3
+ urhadd v27.8b, v22.8b, v23.8b
+ cmp w4, #4
+ uabal v26.8h, v24.8b, v27.8b
+
+ b.ge 1b
+ cbz w4, 3f
+
+// iterate by one
+2:
+ ld1 {v1.8b}, [x2], x3
+ ld1 {v2.8b}, [x5], x3
+ ld1 {v0.8b}, [x1], x3
+ urhadd v30.8b, v1.8b, v2.8b
+ subs w4, w4, #1
+ uabal v26.8h, v0.8b, v30.8b
+
+ b.ne 2b
+3:
+ uaddlv s20, v26.8h
+ fmov w0, s20
+
+ ret
+
+endfunc
+
+function ff_pix_abs8_y2_neon, export=1
+ // x0 unused
+ // x1 uint8_t *pix1
+ // x2 uint8_t *pix2
+ // x3 ptrdiff_t stride
+ // w4 int h
+
+ cmp w4, #4
+ movi v26.8h, #0
+ ld1 {v1.8b}, [x2], x3
+ b.lt 2f
+
+// make 4 iterations at once
+1:
+ ld1 {v2.8b}, [x2], x3
+ ld1 {v0.8b}, [x1], x3
+ ld1 {v6.8b}, [x1], x3
+ urhadd v30.8b, v1.8b, v2.8b
+ ld1 {v5.8b}, [x2], x3
+ ld1 {v21.8b}, [x1], x3
+ uabal v26.8h, v0.8b, v30.8b
+ urhadd v29.8b, v2.8b, v5.8b
+ ld1 {v20.8b}, [x2], x3
+ ld1 {v24.8b}, [x1], x3
+ uabal v26.8h, v6.8b, v29.8b
+ urhadd v28.8b, v5.8b, v20.8b
+ uabal v26.8h, v21.8b, v28.8b
+ ld1 {v23.8b}, [x2], x3
+ mov v1.8b, v23.8b
+ sub w4, w4, #4
+ urhadd v27.8b, v20.8b, v23.8b
+ cmp w4, #4
+ uabal v26.8h, v24.8b, v27.8b
+
+ b.ge 1b
+ cbz w4, 3f
+
+// iterate by one
+2:
+ ld1 {v0.8b}, [x1], x3
+ ld1 {v2.8b}, [x2], x3
+ urhadd v30.8b, v1.8b, v2.8b
+ subs w4, w4, #1
+ uabal v26.8h, v0.8b, v30.8b
+ mov v1.8b, v2.8b
+
+ b.ne 2b
+3:
+ uaddlv s20, v26.8h
+ fmov w0, s20
+
+ ret
+
+endfunc
+
+function ff_pix_abs8_xy2_neon, export=1
+ // x0 unused
+ // x1 uint8_t *pix1
+ // x2 uint8_t *pix2
+ // x3 ptrdiff_t stride
+ // w4 int h
+
+ movi v31.8h, #0
+ add x0, x2, 1 // pix2 + 1
+
+ add x5, x2, x3 // pix2 + stride = pix3
+ cmp w4, #4
+ add x6, x5, 1 // pix3 + stride + 1
+
+ b.lt 2f
+
+ ld1 {v0.8b}, [x2], x3
+ ld1 {v1.8b}, [x0], x3
+ uaddl v2.8h, v0.8b, v1.8b
+
+// make 4 iterations at once
+1:
+ ld1 {v4.8b}, [x5], x3
+ ld1 {v5.8b}, [x6], x3
+ ld1 {v7.8b}, [x5], x3
+ uaddl v0.8h, v4.8b, v5.8b
+ ld1 {v16.8b}, [x6], x3
+ add v4.8h, v0.8h, v2.8h
+ ld1 {v5.8b}, [x1], x3
+ rshrn v4.8b, v4.8h, #2
+ uaddl v7.8h, v7.8b, v16.8b
+ uabal v31.8h, v5.8b, v4.8b
+ add v2.8h, v0.8h, v7.8h
+ ld1 {v17.8b}, [x1], x3
+ rshrn v2.8b, v2.8h, #2
+ ld1 {v20.8b}, [x5], x3
+ uabal v31.8h, v17.8b, v2.8b
+ ld1 {v21.8b}, [x6], x3
+ ld1 {v25.8b}, [x5], x3
+ uaddl v20.8h, v20.8b, v21.8b
+ ld1 {v26.8b}, [x6], x3
+ add v7.8h, v7.8h, v20.8h
+ uaddl v25.8h, v25.8b, v26.8b
+ rshrn v7.8b, v7.8h, #2
+ ld1 {v22.8b}, [x1], x3
+ mov v2.16b, v25.16b
+ uabal v31.8h, v22.8b, v7.8b
+ add v20.8h, v20.8h, v25.8h
+ ld1 {v27.8b}, [x1], x3
+ sub w4, w4, #4
+ rshrn v20.8b, v20.8h, #2
+ cmp w4, #4
+ uabal v31.8h, v27.8b, v20.8b
+
+ b.ge 1b
+
+ cbz w4, 3f
+
+// iterate by one
+2:
+ ld1 {v0.8b}, [x5], x3
+ ld1 {v1.8b}, [x6], x3
+ ld1 {v4.8b}, [x1], x3
+ uaddl v21.8h, v0.8b, v1.8b
+ subs w4, w4, #1
+ add v3.8h, v2.8h, v21.8h
+ mov v2.16b, v21.16b
+ rshrn v3.8b, v3.8h, #2
+ uabal v31.8h, v4.8b, v3.8b
+ b.ne 2b
+
+3:
+ uaddlv s18, v31.8h
+ fmov w0, s18
+
+ ret
+
+endfunc
+
+
function ff_pix_abs16_xy2_neon, export=1
// x0 unused
// x1 uint8_t *pix1
--
2.37.1
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