@@ -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;
}
}
@@ -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
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 <hum@semihalf.com> --- libavcodec/aarch64/me_cmp_init_aarch64.c | 4 ++ libavcodec/aarch64/me_cmp_neon.S | 87 ++++++++++++++++++++++++ 2 files changed, 91 insertions(+)