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lavc/aarch64: Add neon implementation for pix_abs8 

Provide optimized implementation of pix_abs8 function for arm64.

Performance comparison tests are shown below.
- pix_abs_1_0_c: 101.2
- pix_abs_1_0_neon: 22.5
- sad_1_c: 101.2
- sad_1_neon: 22.5

Benchmarks and tests are run with checkasm tool on AWS Graviton 3.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Hubert Mazur 2022-08-16 14:20:16 +02:00 committed by Martin Storsjö
parent 74312e80d7
commit 70efa4d011
2 changed files with 51 additions and 0 deletions
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4
libavcodec/aarch64/me_cmp_init_aarch64.c
View File

@ -31,6 +31,8 @@ int ff_pix_abs16_x2_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *
ptrdiff_t stride, int h);
int ff_pix_abs16_y2_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
ptrdiff_t stride, int h);
int ff_pix_abs8_neon(MpegEncContext *s, const uint8_t *blk1, const uint8_t *blk2,
ptrdiff_t stride, int h);
int sse16_neon(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
ptrdiff_t stride, int h);
@ -48,8 +50,10 @@ av_cold void ff_me_cmp_init_aarch64(MECmpContext *c, AVCodecContext *avctx)
c->pix_abs[0][1] = ff_pix_abs16_x2_neon;
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->sad[0] = ff_pix_abs16_neon;
c->sad[1] = ff_pix_abs8_neon;
c->sse[0] = sse16_neon;
c->sse[1] = sse8_neon;
c->sse[2] = sse4_neon;

47
libavcodec/aarch64/me_cmp_neon.S
View File

@ -72,6 +72,53 @@ function ff_pix_abs16_neon, export=1
ret
endfunc
function ff_pix_abs8_neon, export=1
// x0 unused
// x1 uint8_t *pix1
// x2 uint8_t *pix2
// x3 ptrdiff_t stride
// w4 int h
movi v30.8h, #0
cmp w4, #4
b.lt 2f
// make 4 iterations at once
1:
ld1 {v0.8b}, [x1], x3 // Load pix1 for first iteration
ld1 {v1.8b}, [x2], x3 // Load pix2 for first iteration
ld1 {v2.8b}, [x1], x3 // Load pix1 for second iteration
uabal v30.8h, v0.8b, v1.8b // Absolute difference, first iteration
ld1 {v3.8b}, [x2], x3 // Load pix2 for second iteration
ld1 {v4.8b}, [x1], x3 // Load pix1 for third iteration
uabal v30.8h, v2.8b, v3.8b // Absolute difference, second iteration
ld1 {v5.8b}, [x2], x3 // Load pix2 for third iteration
sub w4, w4, #4 // h -= 4
ld1 {v6.8b}, [x1], x3 // Load pix1 for foruth iteration
ld1 {v7.8b}, [x2], x3 // Load pix2 for fourth iteration
uabal v30.8h, v4.8b, v5.8b // Absolute difference, third iteration
cmp w4, #4
uabal v30.8h, v6.8b, v7.8b // Absolute difference, foruth iteration
b.ge 1b
cbz w4, 3f
// iterate by one
2:
ld1 {v0.8b}, [x1], x3 // Load pix1
ld1 {v1.8b}, [x2], x3 // Load pix2
subs w4, w4, #1
uabal v30.8h, v0.8b, v1.8b
b.ne 2b
3:
uaddlv s20, v30.8h // Add up vector
fmov w0, s20
ret
endfunc
function ff_pix_abs16_xy2_neon, export=1
// x0 unused
// x1 uint8_t *pix1