Provide optimized implementation for vsad8_intra function.
Performance comparison tests are shown below.
- vsad_5_c: 94.7
- vsad_5_neon: 20.7
Benchmarks and tests run with checkasm tool on AWS Graviton 3.
Signed-off-by: Hubert Mazur <h...@semihalf.com>
---
libavcodec/aarch64/me_cmp_init_aarch64.c | 3 ++
libavcodec/aarch64/me_cmp_neon.S | 42 ++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/libavcodec/aarch64/me_cmp_init_aarch64.c
b/libavcodec/aarch64/me_cmp_init_aarch64.c
index fb51a833be..d3fa047a86 100644
--- a/libavcodec/aarch64/me_cmp_init_aarch64.c
+++ b/libavcodec/aarch64/me_cmp_init_aarch64.c
@@ -45,6 +45,8 @@ int vsad16_neon(MpegEncContext *c, const uint8_t *s1, const
uint8_t *s2,
ptrdiff_t stride, int h);
int vsad_intra16_neon(MpegEncContext *c, const uint8_t *s, const uint8_t
*dummy,
ptrdiff_t stride, int h) ;
+int vsad_intra8_neon(MpegEncContext *c, const uint8_t *s, const uint8_t *dummy,
+ ptrdiff_t stride, int h) ;
int vsse16_neon(MpegEncContext *c, const uint8_t *s1, const uint8_t *s2,
ptrdiff_t stride, int h);
int vsse_intra16_neon(MpegEncContext *c, const uint8_t *s, const uint8_t
*dummy,
@@ -75,6 +77,7 @@ av_cold void ff_me_cmp_init_aarch64(MECmpContext *c,
AVCodecContext *avctx)
c->vsad[0] = vsad16_neon;
c->vsad[4] = vsad_intra16_neon;
+ c->vsad[5] = vsad_intra8_neon;
c->vsse[0] = vsse16_neon;
c->vsse[4] = vsse_intra16_neon;
diff --git a/libavcodec/aarch64/me_cmp_neon.S b/libavcodec/aarch64/me_cmp_neon.S
index 1e08d04869..1587f2ea43 100644
--- a/libavcodec/aarch64/me_cmp_neon.S
+++ b/libavcodec/aarch64/me_cmp_neon.S
@@ -1047,3 +1047,45 @@ function pix_median_abs16_neon, export=1
ret
endfunc
+
+function vsad_intra8_neon, export=1
+ // x0 unused
+ // x1 uint8_t *pix1
+ // x2 uint8_t *dummy
+ // x3 ptrdiff_t stride
+ // w4 int h
+
+ ld1 {v0.8b}, [x1], x3
+ sub w4, w4, #1 // we need to make h-1 iterations
+ cmp w4, #3
+ movi v16.8h, #0
+ b.lt 2f
+
+1:
+ // v = abs( pix1[0] - pix1[0 + stride] )
+ // score = sum(v)
+ ld1 {v1.8b}, [x1], x3
+ sub w4, w4, #3
+ ld1 {v2.8b}, [x1], x3
+ uabal v16.8h, v0.8b, v1.8b
+ ld1 {v3.8b}, [x1], x3
+ uabal v16.8h, v1.8b, v2.8b
+ cmp w4, #3
+ mov v0.8b, v3.8b
+ uabal v16.8h, v2.8b, v3.8b
+ b.ge 1b
+ cbz w4, 3f
+
+2:
+ ld1 {v1.8b}, [x1], x3
+ subs w4, w4, #1
+ uabal v16.8h, v0.8b, v1.8b
+ mov v0.8b, v1.8b
+ cbnz w4, 2b
+
+3:
+ uaddlv s17, v16.8h
+ fmov w0, s17
+
+ ret
+endfunc
--
2.34.1
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