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aarch64: me_cmp: Interleave some of the loads in ff_pix_abs16_xy2_neon 

Before:       Cortex A53    A72    A73   Graviton 3
pix_abs_0_3_neon:  183.7  112.7   97.5   41.2
After:
pix_abs_0_3_neon:  175.7  109.2   92.0   41.2

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2022-07-13 00:05:41 +03:00
parent 237730f0e0
commit b46de9aba4
1 changed files with 14 additions and 8 deletions
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22
libavcodec/aarch64/me_cmp_neon.S
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@ -101,26 +101,32 @@ function ff_pix_abs16_xy2_neon, export=1
ld1 {v6.16b}, [x5], x3 // load pix3
ld1 {v16.16b}, [x1], x3 // load pix1
ldur q19, [x5, #1] // load pix3+1
ld1 {v18.16b}, [x5], x3 // load pix3
ld1 {v17.16b}, [x1], x3 // load pix1
ldur q22, [x5, #1] // load pix3+1
ld1 {v21.16b}, [x5], x3 // load pix3
ld1 {v20.16b}, [x1], x3 // load pix1
// These blocks compute the average: avg(pix2[n], pix2[n+1], pix3[n], pix3[n+1])
uaddl v30.8h, v4.8b, v5.8b // pix3 + pix3+1 0..7
uaddl2 v31.8h, v4.16b, v5.16b // pix3 + pix3+1 8..15
ldur q19, [x5, #1] // load pix3+1
add v23.8h, v2.8h, v30.8h // add up 0..7, using pix2 + pix2+1 values from previous iteration
add v24.8h, v3.8h, v31.8h // add up 8..15, using pix2 + pix2+1 values from previous iteration
ld1 {v18.16b}, [x5], x3 // load pix3
ld1 {v17.16b}, [x1], x3 // load pix1
rshrn v23.8b, v23.8h, #2 // shift right 2 0..7 (rounding shift right)
rshrn2 v23.16b, v24.8h, #2 // shift right 2 8..15
uaddl v2.8h, v6.8b, v7.8b // pix3 + pix3+1 0..7
uaddl2 v3.8h, v6.16b, v7.16b // pix3 + pix3+1 8..15
ldur q22, [x5, #1] // load pix3+1
add v26.8h, v30.8h, v2.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above
add v27.8h, v31.8h, v3.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above
ld1 {v21.16b}, [x5], x3 // load pix3
ld1 {v20.16b}, [x1], x3 // load pix1
rshrn v26.8b, v26.8h, #2 // shift right 2 0..7 (rounding shift right)
rshrn2 v26.16b, v27.8h, #2 // shift right 2 8..15