vp9lpf_16bpp_neon.S
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/*
* Copyright (c) 2017 Google Inc.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/aarch64/asm.S"
#include "neon.S"
.macro transpose_4x8H r0, r1, r2, r3, t4, t5, t6, t7
trn1 \t4\().8h, \r0\().8h, \r1\().8h
trn2 \t5\().8h, \r0\().8h, \r1\().8h
trn1 \t6\().8h, \r2\().8h, \r3\().8h
trn2 \t7\().8h, \r2\().8h, \r3\().8h
trn1 \r0\().4s, \t4\().4s, \t6\().4s
trn2 \r2\().4s, \t4\().4s, \t6\().4s
trn1 \r1\().4s, \t5\().4s, \t7\().4s
trn2 \r3\().4s, \t5\().4s, \t7\().4s
.endm
// The input to and output from this macro is in the registers v16-v31,
// and v0-v7 are used as scratch registers.
// p7 = v16 .. p3 = v20, p0 = v23, q0 = v24, q3 = v27, q7 = v31
// Depending on the width of the loop filter, we either use v16-v19
// and v28-v31 as temp registers, or v8-v15.
.macro loop_filter wd, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8
dup v0.8h, w2 // E
dup v2.8h, w3 // I
dup v3.8h, w4 // H
uabd v4.8h, v20.8h, v21.8h // abs(p3 - p2)
uabd v5.8h, v21.8h, v22.8h // abs(p2 - p1)
uabd v6.8h, v22.8h, v23.8h // abs(p1 - p0)
uabd v7.8h, v24.8h, v25.8h // abs(q0 - q1)
uabd \tmp1\().8h, v25.8h, v26.8h // abs(q1 - q2)
uabd \tmp2\().8h, v26.8h, v27.8h // abs(q2 - q3)
umax v4.8h, v4.8h, v5.8h
umax v5.8h, v6.8h, v7.8h
umax \tmp1\().8h, \tmp1\().8h, \tmp2\().8h
uabd v6.8h, v23.8h, v24.8h // abs(p0 - q0)
umax v4.8h, v4.8h, v5.8h
add v6.8h, v6.8h, v6.8h // abs(p0 - q0) * 2
uabd v5.8h, v22.8h, v25.8h // abs(p1 - q1)
umax v4.8h, v4.8h, \tmp1\().8h // max(abs(p3 - p2), ..., abs(q2 - q3))
ushr v5.8h, v5.8h, #1
cmhs v4.8h, v2.8h, v4.8h // max(abs()) <= I
add v6.8h, v6.8h, v5.8h // abs(p0 - q0) * 2 + abs(p1 - q1) >> 1
cmhs v6.8h, v0.8h, v6.8h
and v4.16b, v4.16b, v6.16b // fm
// If no pixels need filtering, just exit as soon as possible
mov x11, v4.d[0]
mov x12, v4.d[1]
adds x11, x11, x12
b.ne 1f
br x10
1:
.if \wd >= 8
dup v0.8h, w5
uabd v6.8h, v20.8h, v23.8h // abs(p3 - p0)
uabd v2.8h, v21.8h, v23.8h // abs(p2 - p0)
uabd v1.8h, v22.8h, v23.8h // abs(p1 - p0)
uabd \tmp1\().8h, v25.8h, v24.8h // abs(q1 - q0)
uabd \tmp2\().8h, v26.8h, v24.8h // abs(q2 - q0)
uabd \tmp3\().8h, v27.8h, v24.8h // abs(q3 - q0)
umax v6.8h, v6.8h, v2.8h
umax v1.8h, v1.8h, \tmp1\().8h
umax \tmp2\().8h, \tmp2\().8h, \tmp3\().8h
.if \wd == 16
uabd v7.8h, v16.8h, v23.8h // abs(p7 - p0)
umax v6.8h, v6.8h, v1.8h
uabd v2.8h, v17.8h, v23.8h // abs(p6 - p0)
umax v6.8h, v6.8h, \tmp2\().8h
uabd v1.8h, v18.8h, v23.8h // abs(p5 - p0)
cmhs v6.8h, v0.8h, v6.8h // flat8in
uabd v8.8h, v19.8h, v23.8h // abs(p4 - p0)
and v6.16b, v6.16b, v4.16b // flat8in && fm
uabd v9.8h, v28.8h, v24.8h // abs(q4 - q0)
bic v4.16b, v4.16b, v6.16b // fm && !flat8in
uabd v10.8h, v29.8h, v24.8h // abs(q5 - q0)
uabd v11.8h, v30.8h, v24.8h // abs(q6 - q0)
uabd v12.8h, v31.8h, v24.8h // abs(q7 - q0)
umax v7.8h, v7.8h, v2.8h
umax v1.8h, v1.8h, v8.8h
umax v9.8h, v9.8h, v10.8h
umax v11.8h, v11.8h, v12.8h
// The rest of the calculation of flat8out is interleaved below
.else
// The rest of the calculation of flat8in is interleaved below
.endif
.endif
// Calculate the normal inner loop filter for 2 or 4 pixels
uabd v5.8h, v22.8h, v23.8h // abs(p1 - p0)
.if \wd == 16
umax v7.8h, v7.8h, v1.8h
umax v9.8h, v9.8h, v11.8h
.elseif \wd == 8
umax v6.8h, v6.8h, v1.8h
.endif
uabd v1.8h, v25.8h, v24.8h // abs(q1 - q0)
.if \wd == 16
umax v7.8h, v7.8h, v9.8h
.elseif \wd == 8
umax v6.8h, v6.8h, \tmp2\().8h
.endif
dup \tmp2\().8h, w6 // left shift for saturation
sub \tmp1\().8h, v22.8h, v25.8h // p1 - q1
neg \tmp6\().8h, \tmp2\().8h // negative left shift after saturation
umax v5.8h, v5.8h, v1.8h // max(abs(p1 - p0), abs(q1 - q0))
sub \tmp3\().8h, v24.8h, v23.8h // q0 - p0
movi \tmp5\().8h, #3
.if \wd == 8
cmhs v6.8h, v0.8h, v6.8h // flat8in
.endif
cmhs v5.8h, v3.8h, v5.8h // !hev
.if \wd == 8
and v6.16b, v6.16b, v4.16b // flat8in && fm
.endif
sqshl \tmp1\().8h, \tmp1\().8h, \tmp2\().8h
.if \wd == 16
cmhs v7.8h, v0.8h, v7.8h // flat8out
.elseif \wd == 8
bic v4.16b, v4.16b, v6.16b // fm && !flat8in
.endif
and v5.16b, v5.16b, v4.16b // !hev && fm && !flat8in
.if \wd == 16
and v7.16b, v7.16b, v6.16b // flat8out && flat8in && fm
.endif
sshl \tmp1\().8h, \tmp1\().8h, \tmp6\().8h // av_clip_int2p(p1 - q1, BIT_DEPTH - 1)
mul \tmp3\().8h, \tmp3\().8h, \tmp5\().8h // 3 * (q0 - p0)
bic \tmp1\().16b, \tmp1\().16b, v5.16b // if (!hev) av_clip_int8 = 0
movi v2.8h, #4
add \tmp3\().8h, \tmp3\().8h, \tmp1\().8h // 3 * (q0 - p0) [+ av_clip_int8(p1 - q1)]
movi v3.8h, #3
sqshl \tmp1\().8h, \tmp3\().8h, \tmp2\().8h
movi \tmp5\().8h, #0
sshl \tmp1\().8h, \tmp1\().8h, \tmp6\().8h // av_clip_int2p(3 * (q0 - p0) [+ av_clip_int2p(p1 - q1)], BIT_DEPTH - 1) = f
dup \tmp6\().8h, w7 // max pixel value
.if \wd == 16
bic v6.16b, v6.16b, v7.16b // fm && flat8in && !flat8out
.endif
ushr \tmp2\().8h, \tmp6\().8h, #1 // (1 << (BIT_DEPTH - 1)) - 1
add \tmp3\().8h, \tmp1\().8h, v2.8h // f + 4
add \tmp4\().8h, \tmp1\().8h, v3.8h // f + 3
smin \tmp3\().8h, \tmp3\().8h, \tmp2\().8h // FFMIN(f + 4, (1 << (BIT_DEPTH - 1)) - 1)
smin \tmp4\().8h, \tmp4\().8h, \tmp2\().8h // FFMIN(f + 3, (1 << (BIT_DEPTH - 1)) - 1)
sshr \tmp3\().8h, \tmp3\().8h, #3 // f1
sshr \tmp4\().8h, \tmp4\().8h, #3 // f2
add v0.8h, v23.8h, \tmp4\().8h // p0 + f2
sub v2.8h, v24.8h, \tmp3\().8h // q0 - f1
smin v0.8h, v0.8h, \tmp6\().8h
smin v2.8h, v2.8h, \tmp6\().8h
srshr \tmp3\().8h, \tmp3\().8h, #1 // f = (f1 + 1) >> 1
smax v0.8h, v0.8h, \tmp5\().8h // out p0
smax v2.8h, v2.8h, \tmp5\().8h // out q0
bit v23.16b, v0.16b, v4.16b // if (fm && !flat8in)
bit v24.16b, v2.16b, v4.16b
add v0.8h, v22.8h, \tmp3\().8h // p1 + f
sub v2.8h, v25.8h, \tmp3\().8h // q1 - f
.if \wd >= 8
mov x11, v6.d[0]
.endif
smin v0.8h, v0.8h, \tmp6\().8h
smin v2.8h, v2.8h, \tmp6\().8h
.if \wd >= 8
mov x12, v6.d[1]
.endif
smax v0.8h, v0.8h, \tmp5\().8h // out p1
smax v2.8h, v2.8h, \tmp5\().8h // out q1
.if \wd >= 8
adds x11, x11, x12
.endif
bit v22.16b, v0.16b, v5.16b // if (!hev && fm && !flat8in)
bit v25.16b, v2.16b, v5.16b
// If no pixels need flat8in, jump to flat8out
// (or to a writeout of the inner 4 pixels, for wd=8)
.if \wd >= 8
.if \wd == 16
b.eq 6f
.else
b.ne 1f
br x13
1:
.endif
// flat8in
add \tmp1\().8h, v20.8h, v21.8h
add \tmp3\().8h, v22.8h, v25.8h
add \tmp5\().8h, v20.8h, v22.8h
add \tmp7\().8h, v23.8h, v26.8h
add v0.8h, \tmp1\().8h, \tmp1\().8h
add v0.8h, v0.8h, v23.8h
add v0.8h, v0.8h, v24.8h
add v0.8h, v0.8h, \tmp5\().8h
sub \tmp3\().8h, \tmp3\().8h, \tmp1\().8h
sub \tmp7\().8h, \tmp7\().8h, \tmp5\().8h
urshr v2.8h, v0.8h, #3 // out p2
add v0.8h, v0.8h, \tmp3\().8h
add \tmp1\().8h, v20.8h, v23.8h
add \tmp3\().8h, v24.8h, v27.8h
urshr v3.8h, v0.8h, #3 // out p1
add v0.8h, v0.8h, \tmp7\().8h
sub \tmp3\().8h, \tmp3\().8h, \tmp1\().8h
add \tmp5\().8h, v21.8h, v24.8h
add \tmp7\().8h, v25.8h, v27.8h
urshr v4.8h, v0.8h, #3 // out p0
add v0.8h, v0.8h, \tmp3\().8h
sub \tmp7\().8h, \tmp7\().8h, \tmp5\().8h
add \tmp1\().8h, v22.8h, v25.8h
add \tmp3\().8h, v26.8h, v27.8h
urshr v5.8h, v0.8h, #3 // out q0
add v0.8h, v0.8h, \tmp7\().8h
sub \tmp3\().8h, \tmp3\().8h, \tmp1\().8h
urshr \tmp5\().8h, v0.8h, #3 // out q1
add v0.8h, v0.8h, \tmp3\().8h
// The output here is written back into the input registers. This doesn't
// matter for the flat8part below, since we only update those pixels
// which won't be touched below.
bit v21.16b, v2.16b, v6.16b
bit v22.16b, v3.16b, v6.16b
bit v23.16b, v4.16b, v6.16b
urshr \tmp6\().8h, v0.8h, #3 // out q2
bit v24.16b, v5.16b, v6.16b
bit v25.16b, \tmp5\().16b, v6.16b
bit v26.16b, \tmp6\().16b, v6.16b
.endif
.if \wd == 16
6:
orr v2.16b, v6.16b, v7.16b
mov x11, v2.d[0]
mov x12, v2.d[1]
adds x11, x11, x12
b.ne 1f
// If no pixels needed flat8in nor flat8out, jump to a
// writeout of the inner 4 pixels
br x14
1:
mov x11, v7.d[0]
mov x12, v7.d[1]
adds x11, x11, x12
b.ne 1f
// If no pixels need flat8out, jump to a writeout of the inner 6 pixels
br x15
1:
// flat8out
// This writes all outputs into v2-v17 (skipping v6 and v16).
// If this part is skipped, the output is read from v21-v26 (which is the input
// to this section).
shl v0.8h, v16.8h, #3 // 8 * v16
sub v0.8h, v0.8h, v16.8h // 7 * v16
add v0.8h, v0.8h, v17.8h
add v8.8h, v17.8h, v18.8h
add v10.8h, v19.8h, v20.8h
add v0.8h, v0.8h, v8.8h
add v8.8h, v16.8h, v17.8h
add v12.8h, v21.8h, v22.8h
add v0.8h, v0.8h, v10.8h
add v10.8h, v18.8h, v25.8h
add v14.8h, v23.8h, v24.8h
sub v10.8h, v10.8h, v8.8h
add v0.8h, v0.8h, v12.8h
add v0.8h, v0.8h, v14.8h
add v12.8h, v16.8h, v18.8h
add v14.8h, v19.8h, v26.8h
urshr v2.8h, v0.8h, #4
add v0.8h, v0.8h, v10.8h
add v8.8h, v16.8h, v19.8h
add v10.8h, v20.8h, v27.8h
sub v14.8h, v14.8h, v12.8h
bif v2.16b, v17.16b, v7.16b
urshr v3.8h , v0.8h, #4
add v0.8h, v0.8h, v14.8h
add v12.8h, v16.8h, v20.8h
add v14.8h, v21.8h, v28.8h
sub v10.8h, v10.8h, v8.8h
bif v3.16b, v18.16b, v7.16b
urshr v4.8h, v0.8h, #4
add v0.8h, v0.8h, v10.8h
add v8.8h, v16.8h, v21.8h
add v10.8h, v22.8h, v29.8h
sub v14.8h, v14.8h, v12.8h
bif v4.16b, v19.16b, v7.16b
urshr v5.8h, v0.8h, #4
add v0.8h, v0.8h, v14.8h
add v12.8h, v16.8h, v22.8h
add v14.8h, v23.8h, v30.8h
sub v10.8h, v10.8h, v8.8h
bif v5.16b, v20.16b, v7.16b
urshr v6.8h, v0.8h, #4
add v0.8h, v0.8h, v10.8h
add v10.8h, v16.8h, v23.8h
sub v14.8h, v14.8h, v12.8h
add v12.8h, v24.8h, v31.8h
bif v6.16b, v21.16b, v7.16b
urshr v8.8h, v0.8h, #4
add v0.8h, v0.8h, v14.8h
sub v10.8h, v12.8h, v10.8h
add v12.8h, v17.8h, v24.8h
add v14.8h, v25.8h, v31.8h
bif v8.16b, v22.16b, v7.16b
urshr v9.8h, v0.8h, #4
add v0.8h, v0.8h, v10.8h
sub v14.8h, v14.8h, v12.8h
add v12.8h, v26.8h, v31.8h
bif v9.16b, v23.16b, v7.16b
urshr v10.8h, v0.8h, #4
add v0.8h, v0.8h, v14.8h
add v14.8h, v18.8h, v25.8h
add v18.8h, v19.8h, v26.8h
sub v12.8h, v12.8h, v14.8h
add v14.8h, v27.8h, v31.8h
bif v10.16b, v24.16b, v7.16b
urshr v11.8h, v0.8h, #4
add v0.8h, v0.8h, v12.8h
add v12.8h, v20.8h, v27.8h
sub v14.8h, v14.8h, v18.8h
add v18.8h, v28.8h, v31.8h
bif v11.16b, v25.16b, v7.16b
sub v18.8h, v18.8h, v12.8h
urshr v12.8h, v0.8h, #4
add v0.8h, v0.8h, v14.8h
add v14.8h, v21.8h, v28.8h
add v20.8h, v29.8h, v31.8h
bif v12.16b, v26.16b, v7.16b
urshr v13.8h, v0.8h, #4
add v0.8h, v0.8h, v18.8h
sub v20.8h, v20.8h, v14.8h
add v18.8h, v22.8h, v29.8h
add v22.8h, v30.8h, v31.8h
bif v13.16b, v27.16b, v7.16b
urshr v14.8h, v0.8h, #4
add v0.8h, v0.8h, v20.8h
sub v22.8h, v22.8h, v18.8h
bif v14.16b, v28.16b, v7.16b
urshr v15.8h, v0.8h, #4
add v0.8h, v0.8h, v22.8h
bif v15.16b, v29.16b, v7.16b
urshr v17.8h, v0.8h, #4
bif v17.16b, v30.16b, v7.16b
.endif
.endm
// For wd <= 8, we use v16-v19 and v28-v31 for temp registers,
// while we need those for inputs/outputs in wd=16 and use v8-v15
// for temp registers there instead.
function vp9_loop_filter_4
loop_filter 4, v16, v17, v18, v19, v28, v29, v30, v31
ret
endfunc
function vp9_loop_filter_8
loop_filter 8, v16, v17, v18, v19, v28, v29, v30, v31
ret
endfunc
function vp9_loop_filter_16
loop_filter 16, v8, v9, v10, v11, v12, v13, v14, v15
ret
endfunc
.macro loop_filter_4
bl vp9_loop_filter_4
.endm
.macro loop_filter_8
// calculate alternative 'return' targets
adr x13, 6f
bl vp9_loop_filter_8
.endm
.macro loop_filter_16
// calculate alternative 'return' targets
adr x14, 7f
adr x15, 8f
bl vp9_loop_filter_16
.endm
// The public functions in this file have got the following signature:
// void loop_filter(uint8_t *dst, ptrdiff_t stride, int mb_lim, int lim, int hev_thr);
.macro bpp_frontend func, bpp, push
function ff_\func\()_\bpp\()_neon, export=1
.if \push
mov x16, x30
stp d14, d15, [sp, #-0x10]!
stp d12, d13, [sp, #-0x10]!
stp d10, d11, [sp, #-0x10]!
stp d8, d9, [sp, #-0x10]!
.endif
lsl w2, w2, #\bpp - 8
lsl w3, w3, #\bpp - 8
lsl w4, w4, #\bpp - 8
mov x5, #1 << (\bpp - 8)
mov x6, #16 - \bpp
mov x7, #((1 << \bpp) - 1)
.if \push
bl \func\()_16_neon
ldp d8, d9, [sp], 0x10
ldp d10, d11, [sp], 0x10
ldp d12, d13, [sp], 0x10
ldp d14, d15, [sp], 0x10
br x16
.else
b \func\()_16_neon
.endif
endfunc
.endm
.macro bpp_frontends func, push=0
bpp_frontend \func, 10, \push
bpp_frontend \func, 12, \push
.endm
.macro bpp_frontend_rep func, suffix, int_suffix, dir, bpp, push
function ff_\func\()_\suffix\()_\bpp\()_neon, export=1
mov x16, x30
.if \push
stp d14, d15, [sp, #-0x10]!
stp d12, d13, [sp, #-0x10]!
stp d10, d11, [sp, #-0x10]!
stp d8, d9, [sp, #-0x10]!
.endif
lsl w2, w2, #\bpp - 8
lsl w3, w3, #\bpp - 8
lsl w4, w4, #\bpp - 8
mov x5, #1 << (\bpp - 8)
mov x6, #16 - \bpp
mov x7, #((1 << \bpp) - 1)
bl \func\()_\int_suffix\()_16_neon
.ifc \dir,h
add x0, x0, x1, lsl #3
.else
add x0, x0, #16
.endif
bl \func\()_\int_suffix\()_16_neon
.if \push
ldp d8, d9, [sp], 0x10
ldp d10, d11, [sp], 0x10
ldp d12, d13, [sp], 0x10
ldp d14, d15, [sp], 0x10
.endif
br x16
endfunc
.endm
.macro bpp_frontends_rep func, suffix, int_suffix, dir, push=0
bpp_frontend_rep \func, \suffix, \int_suffix, \dir, 10, \push
bpp_frontend_rep \func, \suffix, \int_suffix, \dir, 12, \push
.endm
.macro bpp_frontend_mix2 wd1, wd2, dir, bpp
function ff_vp9_loop_filter_\dir\()_\wd1\()\wd2\()_16_\bpp\()_neon, export=1
mov x16, x30
lsr w8, w2, #8
lsr w14, w3, #8
lsr w15, w4, #8
and w2, w2, #0xff
and w3, w3, #0xff
and w4, w4, #0xff
lsl w2, w2, #\bpp - 8
lsl w3, w3, #\bpp - 8
lsl w4, w4, #\bpp - 8
mov x5, #1 << (\bpp - 8)
mov x6, #16 - \bpp
mov x7, #((1 << \bpp) - 1)
bl vp9_loop_filter_\dir\()_\wd1\()_8_16_neon
.ifc \dir,h
add x0, x0, x1, lsl #3
.else
add x0, x0, #16
.endif
lsl w2, w8, #\bpp - 8
lsl w3, w14, #\bpp - 8
lsl w4, w15, #\bpp - 8
bl vp9_loop_filter_\dir\()_\wd2\()_8_16_neon
br x16
endfunc
.endm
.macro bpp_frontends_mix2 wd1, wd2
bpp_frontend_mix2 \wd1, \wd2, v, 10
bpp_frontend_mix2 \wd1, \wd2, v, 12
bpp_frontend_mix2 \wd1, \wd2, h, 10
bpp_frontend_mix2 \wd1, \wd2, h, 12
.endm
function vp9_loop_filter_v_4_8_16_neon
mov x10, x30
sub x9, x0, x1, lsl #2
ld1 {v20.8h}, [x9], x1 // p3
ld1 {v24.8h}, [x0], x1 // q0
ld1 {v21.8h}, [x9], x1 // p2
ld1 {v25.8h}, [x0], x1 // q1
ld1 {v22.8h}, [x9], x1 // p1
ld1 {v26.8h}, [x0], x1 // q2
ld1 {v23.8h}, [x9], x1 // p0
ld1 {v27.8h}, [x0], x1 // q3
sub x0, x0, x1, lsl #2
sub x9, x9, x1, lsl #1
loop_filter_4
st1 {v22.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
sub x0, x0, x1, lsl #1
br x10
endfunc
bpp_frontends vp9_loop_filter_v_4_8
function vp9_loop_filter_h_4_8_16_neon
mov x10, x30
sub x9, x0, #8
add x0, x9, x1, lsl #2
ld1 {v20.8h}, [x9], x1
ld1 {v24.8h}, [x0], x1
ld1 {v21.8h}, [x9], x1
ld1 {v25.8h}, [x0], x1
ld1 {v22.8h}, [x9], x1
ld1 {v26.8h}, [x0], x1
ld1 {v23.8h}, [x9], x1
ld1 {v27.8h}, [x0], x1
sub x9, x9, x1, lsl #2
sub x0, x0, x1, lsl #3
add x0, x0, #8
transpose_8x8H v20, v21, v22, v23, v24, v25, v26, v27, v28, v29
loop_filter_4
// Move x9 forward by 2 pixels; we don't need to rewrite the
// outermost 2 pixels since they aren't changed.
add x9, x9, #4
add x0, x9, x1, lsl #2
// We only will write the mid 4 pixels back; after the loop filter,
// these are in v22, v23, v24, v25, ordered as rows (8x4 pixels).
// We need to transpose them to columns, done with a 4x8 transpose
// (which in practice is two 4x4 transposes of the two 4x4 halves
// of the 8x4 pixels; into 4x8 pixels).
transpose_4x8H v22, v23, v24, v25, v26, v27, v28, v29
st1 {v22.d}[0], [x9], x1
st1 {v22.d}[1], [x0], x1
st1 {v23.d}[0], [x9], x1
st1 {v23.d}[1], [x0], x1
st1 {v24.d}[0], [x9], x1
st1 {v24.d}[1], [x0], x1
st1 {v25.d}[0], [x9], x1
st1 {v25.d}[1], [x0], x1
sub x0, x0, x1, lsl #3
add x0, x0, #4
br x10
endfunc
bpp_frontends vp9_loop_filter_h_4_8
function vp9_loop_filter_v_8_8_16_neon
mov x10, x30
sub x9, x0, x1, lsl #2
ld1 {v20.8h}, [x9], x1 // p3
ld1 {v24.8h}, [x0], x1 // q0
ld1 {v21.8h}, [x9], x1 // p2
ld1 {v25.8h}, [x0], x1 // q1
ld1 {v22.8h}, [x9], x1 // p1
ld1 {v26.8h}, [x0], x1 // q2
ld1 {v23.8h}, [x9], x1 // p0
ld1 {v27.8h}, [x0], x1 // q3
sub x9, x9, x1, lsl #2
sub x0, x0, x1, lsl #2
add x9, x9, x1
loop_filter_8
st1 {v21.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v22.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v26.8h}, [x0], x1
sub x0, x0, x1, lsl #1
sub x0, x0, x1
br x10
6:
sub x9, x0, x1, lsl #1
st1 {v22.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
sub x0, x0, x1, lsl #1
br x10
endfunc
bpp_frontends vp9_loop_filter_v_8_8
function vp9_loop_filter_h_8_8_16_neon
mov x10, x30
sub x9, x0, #8
add x0, x9, x1, lsl #2
ld1 {v20.8h}, [x9], x1
ld1 {v24.8h}, [x0], x1
ld1 {v21.8h}, [x9], x1
ld1 {v25.8h}, [x0], x1
ld1 {v22.8h}, [x9], x1
ld1 {v26.8h}, [x0], x1
ld1 {v23.8h}, [x9], x1
ld1 {v27.8h}, [x0], x1
sub x9, x9, x1, lsl #2
sub x0, x0, x1, lsl #3
add x0, x0, #8
transpose_8x8H v20, v21, v22, v23, v24, v25, v26, v27, v28, v29
loop_filter_8
add x0, x9, x1, lsl #2
// Even though only 6 pixels per row have been changed, we write the
// full 8 pixel registers.
transpose_8x8H v20, v21, v22, v23, v24, v25, v26, v27, v28, v29
st1 {v20.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v21.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
st1 {v22.8h}, [x9], x1
st1 {v26.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v27.8h}, [x0], x1
sub x0, x0, x1, lsl #3
add x0, x0, #8
br x10
6:
// If we didn't need to do the flat8in part, we use the same writeback
// as in loop_filter_h_4_8.
add x9, x9, #4
add x0, x9, x1, lsl #2
transpose_4x8H v22, v23, v24, v25, v26, v27, v28, v29
st1 {v22.d}[0], [x9], x1
st1 {v22.d}[1], [x0], x1
st1 {v23.d}[0], [x9], x1
st1 {v23.d}[1], [x0], x1
st1 {v24.d}[0], [x9], x1
st1 {v24.d}[1], [x0], x1
st1 {v25.d}[0], [x9], x1
st1 {v25.d}[1], [x0], x1
sub x0, x0, x1, lsl #3
add x0, x0, #4
br x10
endfunc
bpp_frontends vp9_loop_filter_h_8_8
bpp_frontends_mix2 4, 4
bpp_frontends_mix2 4, 8
bpp_frontends_mix2 8, 4
bpp_frontends_mix2 8, 8
function vp9_loop_filter_v_16_8_16_neon
mov x10, x30
sub x9, x0, x1, lsl #3
ld1 {v16.8h}, [x9], x1 // p7
ld1 {v24.8h}, [x0], x1 // q0
ld1 {v17.8h}, [x9], x1 // p6
ld1 {v25.8h}, [x0], x1 // q1
ld1 {v18.8h}, [x9], x1 // p5
ld1 {v26.8h}, [x0], x1 // q2
ld1 {v19.8h}, [x9], x1 // p4
ld1 {v27.8h}, [x0], x1 // q3
ld1 {v20.8h}, [x9], x1 // p3
ld1 {v28.8h}, [x0], x1 // q4
ld1 {v21.8h}, [x9], x1 // p2
ld1 {v29.8h}, [x0], x1 // q5
ld1 {v22.8h}, [x9], x1 // p1
ld1 {v30.8h}, [x0], x1 // q6
ld1 {v23.8h}, [x9], x1 // p0
ld1 {v31.8h}, [x0], x1 // q7
sub x9, x9, x1, lsl #3
sub x0, x0, x1, lsl #3
add x9, x9, x1
loop_filter_16
// If we did the flat8out part, we get the output in
// v2-v17 (skipping v7 and v16). x9 points to x0 - 7 * stride,
// store v2-v9 there, and v10-v17 into x0.
st1 {v2.8h}, [x9], x1
st1 {v10.8h}, [x0], x1
st1 {v3.8h}, [x9], x1
st1 {v11.8h}, [x0], x1
st1 {v4.8h}, [x9], x1
st1 {v12.8h}, [x0], x1
st1 {v5.8h}, [x9], x1
st1 {v13.8h}, [x0], x1
st1 {v6.8h}, [x9], x1
st1 {v14.8h}, [x0], x1
st1 {v8.8h}, [x9], x1
st1 {v15.8h}, [x0], x1
st1 {v9.8h}, [x9], x1
st1 {v17.8h}, [x0], x1
sub x0, x0, x1, lsl #3
add x0, x0, x1
br x10
8:
add x9, x9, x1, lsl #2
// If we didn't do the flat8out part, the output is left in the
// input registers.
st1 {v21.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v22.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v26.8h}, [x0], x1
sub x0, x0, x1, lsl #1
sub x0, x0, x1
br x10
7:
sub x9, x0, x1, lsl #1
st1 {v22.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
sub x0, x0, x1, lsl #1
br x10
endfunc
bpp_frontends vp9_loop_filter_v_16_8, push=1
bpp_frontends_rep vp9_loop_filter_v_16, 16, 8, v, push=1
function vp9_loop_filter_h_16_8_16_neon
mov x10, x30
sub x9, x0, #16
ld1 {v16.8h}, [x9], x1
ld1 {v24.8h}, [x0], x1
ld1 {v17.8h}, [x9], x1
ld1 {v25.8h}, [x0], x1
ld1 {v18.8h}, [x9], x1
ld1 {v26.8h}, [x0], x1
ld1 {v19.8h}, [x9], x1
ld1 {v27.8h}, [x0], x1
ld1 {v20.8h}, [x9], x1
ld1 {v28.8h}, [x0], x1
ld1 {v21.8h}, [x9], x1
ld1 {v29.8h}, [x0], x1
ld1 {v22.8h}, [x9], x1
ld1 {v30.8h}, [x0], x1
ld1 {v23.8h}, [x9], x1
ld1 {v31.8h}, [x0], x1
sub x0, x0, x1, lsl #3
sub x9, x9, x1, lsl #3
// The 16x8 pixels read above is in two 8x8 blocks; the left
// half in v16-v23, and the right half in v24-v31. Do two 8x8 transposes
// of this, to get one column per register.
transpose_8x8H v16, v17, v18, v19, v20, v21, v22, v23, v0, v1
transpose_8x8H v24, v25, v26, v27, v28, v29, v30, v31, v0, v1
loop_filter_16
transpose_8x8H v16, v2, v3, v4, v5, v6, v8, v9, v0, v1
transpose_8x8H v10, v11, v12, v13, v14, v15, v17, v31, v0, v1
st1 {v16.8h}, [x9], x1
st1 {v10.8h}, [x0], x1
st1 {v2.8h}, [x9], x1
st1 {v11.8h}, [x0], x1
st1 {v3.8h}, [x9], x1
st1 {v12.8h}, [x0], x1
st1 {v4.8h}, [x9], x1
st1 {v13.8h}, [x0], x1
st1 {v5.8h}, [x9], x1
st1 {v14.8h}, [x0], x1
st1 {v6.8h}, [x9], x1
st1 {v15.8h}, [x0], x1
st1 {v8.8h}, [x9], x1
st1 {v17.8h}, [x0], x1
st1 {v9.8h}, [x9], x1
st1 {v31.8h}, [x0], x1
sub x0, x0, x1, lsl #3
br x10
8:
// The same writeback as in loop_filter_h_8_8
sub x9, x0, #8
add x0, x9, x1, lsl #2
transpose_8x8H v20, v21, v22, v23, v24, v25, v26, v27, v28, v29
st1 {v20.8h}, [x9], x1
st1 {v24.8h}, [x0], x1
st1 {v21.8h}, [x9], x1
st1 {v25.8h}, [x0], x1
st1 {v22.8h}, [x9], x1
st1 {v26.8h}, [x0], x1
st1 {v23.8h}, [x9], x1
st1 {v27.8h}, [x0], x1
sub x0, x0, x1, lsl #3
add x0, x0, #8
br x10
7:
// The same writeback as in loop_filter_h_4_8
sub x9, x0, #4
add x0, x9, x1, lsl #2
transpose_4x8H v22, v23, v24, v25, v26, v27, v28, v29
st1 {v22.d}[0], [x9], x1
st1 {v22.d}[1], [x0], x1
st1 {v23.d}[0], [x9], x1
st1 {v23.d}[1], [x0], x1
st1 {v24.d}[0], [x9], x1
st1 {v24.d}[1], [x0], x1
st1 {v25.d}[0], [x9], x1
st1 {v25.d}[1], [x0], x1
sub x0, x0, x1, lsl #3
add x0, x0, #4
br x10
endfunc
bpp_frontends vp9_loop_filter_h_16_8, push=1
bpp_frontends_rep vp9_loop_filter_h_16, 16, 8, h, push=1