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h264/aarch64: optimize neon loop filter

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Exit as soon as possible if no filtering will be done.

Improves the checkasm --bench cycle count on a Snapdragon 820e:
h264_h_loop_filter_luma_8bpp_c:      72.4 ->  72.5
h264_h_loop_filter_luma_8bpp_neon:   97.1 ->  56.3
h264_v_loop_filter_luma_8bpp_c:     174.0 -> 173.5
h264_v_loop_filter_luma_8bpp_neon:   62.9 ->  60.9
h264_h_loop_filter_chroma_8bpp_c:    30.2 ->  30.3
h264_h_loop_filter_chroma_8bpp_neon: 51.6 ->  25.7
h264_v_loop_filter_chroma_8bpp_c:    57.3 ->  57.3
h264_v_loop_filter_chroma_8bpp_neon: 28.0 ->  24.0
This commit is contained in:
Janne Grunau 2019-01-01 22:37:11 +01:00
parent d7f4f5c4a1
commit 846c3d6aca
1 changed files with 20 additions and 15 deletions
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35
libavcodec/aarch64/h264dsp_neon.S
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@ -54,9 +54,12 @@
uabd v17.16B, v20.16B, v16.16B // abs(p2 - p0)
and v21.16B, v21.16B, v28.16B
uabd v19.16B, v4.16B, v0.16B // abs(q2 - q0)
and v21.16B, v21.16B, v30.16B // < beta
shrn v30.8b, v21.8h, #4
mov x7, v30.d[0]
cmhi v17.16B, v22.16B, v17.16B // < beta
and v21.16B, v21.16B, v30.16B
cmhi v19.16B, v22.16B, v19.16B // < beta
cbz x7, 9f
and v17.16B, v17.16B, v21.16B
and v19.16B, v19.16B, v21.16B
and v24.16B, v24.16B, v21.16B
@ -124,7 +127,7 @@ function ff_h264_v_loop_filter_luma_neon, export=1
st1 {v16.16B}, [x0], x1
st1 {v0.16B}, [x0], x1
st1 {v19.16B}, [x0]
9:
ret
endfunc
@ -174,32 +177,34 @@ function ff_h264_h_loop_filter_luma_neon, export=1
st1 {v16.S}[3], [x0], x1
st1 {v0.S}[3], [x0], x1
st1 {v19.S}[3], [x0], x1
9:
ret
endfunc
.macro h264_loop_filter_chroma
dup v22.8B, w2 // alpha
dup v23.8B, w3 // beta
uxtl v24.8H, v24.8B
uabd v26.8B, v16.8B, v0.8B // abs(p0 - q0)
uxtl v4.8H, v0.8B
uabd v28.8B, v18.8B, v16.8B // abs(p1 - p0)
usubw v4.8H, v4.8H, v16.8B
sli v24.8H, v24.8H, #8
shl v4.8H, v4.8H, #2
uabd v30.8B, v2.8B, v0.8B // abs(q1 - q0)
uaddw v4.8H, v4.8H, v18.8B
cmhi v26.8B, v22.8B, v26.8B // < alpha
cmhi v28.8B, v23.8B, v28.8B // < beta
cmhi v30.8B, v23.8B, v30.8B // < beta
uxtl v4.8H, v0.8B
and v26.8B, v26.8B, v28.8B
usubw v4.8H, v4.8H, v16.8B
and v26.8B, v26.8B, v30.8B
shl v4.8H, v4.8H, #2
mov x2, v26.d[0]
sli v24.8H, v24.8H, #8
uaddw v4.8H, v4.8H, v18.8B
cbz x2, 9f
usubw v4.8H, v4.8H, v2.8B
dup v22.8B, w3 // beta
rshrn v4.8B, v4.8H, #3
cmhi v28.8B, v22.8B, v28.8B // < beta
cmhi v30.8B, v22.8B, v30.8B // < beta
smin v4.8B, v4.8B, v24.8B
neg v25.8B, v24.8B
and v26.8B, v26.8B, v28.8B
smax v4.8B, v4.8B, v25.8B
and v26.8B, v26.8B, v30.8B
uxtl v22.8H, v0.8B
and v4.8B, v4.8B, v26.8B
uxtl v28.8H, v16.8B
@ -224,7 +229,7 @@ function ff_h264_v_loop_filter_chroma_neon, export=1
sub x0, x0, x1, lsl #1
st1 {v16.8B}, [x0], x1
st1 {v0.8B}, [x0], x1
9:
ret
endfunc
@ -257,7 +262,7 @@ function ff_h264_h_loop_filter_chroma_neon, export=1
st1 {v16.S}[1], [x0], x1
st1 {v0.S}[1], [x0], x1
st1 {v2.S}[1], [x0], x1
9:
ret
endfunc