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/*
* ARM NEON IDCT
*
* Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
* Copyright (c) 2017 Matthieu Bouron <matthieu.bouron@gmail.com>
*
* Based on Simple IDCT
* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
*
* 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"
#define Z1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define Z4c ((1<<(COL_SHIFT-1))/Z4)
#define ROW_SHIFT 11
#define COL_SHIFT 20
#define z1 v0.H[0]
#define z2 v0.H[1]
#define z3 v0.H[2]
#define z4 v0.H[3]
#define z5 v0.H[4]
#define z6 v0.H[5]
#define z7 v0.H[6]
#define z4c v0.H[7]
const idct_coeff_neon, align=4
.short Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z4c
endconst
.macro idct_start data
prfm pldl1keep, [\data]
mov x10, x30
movrel x3, idct_coeff_neon
ld1 {v0.2D}, [x3]
.endm
.macro idct_end
ret x10
.endm
.macro smull1 a, b, c
smull \a, \b, \c
.endm
.macro smlal1 a, b, c
smlal \a, \b, \c
.endm
.macro smlsl1 a, b, c
smlsl \a, \b, \c
.endm
.macro idct_col4_top y1, y2, y3, y4, i, l
smull\i v7.4S, \y3\l, z2
smull\i v16.4S, \y3\l, z6
smull\i v17.4S, \y2\l, z1
add v19.4S, v23.4S, v7.4S
smull\i v18.4S, \y2\l, z3
add v20.4S, v23.4S, v16.4S
smull\i v5.4S, \y2\l, z5
sub v21.4S, v23.4S, v16.4S
smull\i v6.4S, \y2\l, z7
sub v22.4S, v23.4S, v7.4S
smlal\i v17.4S, \y4\l, z3
smlsl\i v18.4S, \y4\l, z7
smlsl\i v5.4S, \y4\l, z1
smlsl\i v6.4S, \y4\l, z5
.endm
.macro idct_row4_neon y1, y2, y3, y4, pass
ld1 {\y1\().2D,\y2\().2D}, [x2], #32
movi v23.4S, #1<<2, lsl #8
orr v5.16B, \y1\().16B, \y2\().16B
ld1 {\y3\().2D,\y4\().2D}, [x2], #32
orr v6.16B, \y3\().16B, \y4\().16B
orr v5.16B, v5.16B, v6.16B
mov x3, v5.D[1]
smlal v23.4S, \y1\().4H, z4
idct_col4_top \y1, \y2, \y3, \y4, 1, .4H
cmp x3, #0
b.eq \pass\()f
smull2 v7.4S, \y1\().8H, z4
smlal2 v17.4S, \y2\().8H, z5
smlsl2 v18.4S, \y2\().8H, z1
smull2 v16.4S, \y3\().8H, z2
smlal2 v5.4S, \y2\().8H, z7
add v19.4S, v19.4S, v7.4S
sub v20.4S, v20.4S, v7.4S
sub v21.4S, v21.4S, v7.4S
add v22.4S, v22.4S, v7.4S
smlal2 v6.4S, \y2\().8H, z3
smull2 v7.4S, \y3\().8H, z6
smlal2 v17.4S, \y4\().8H, z7
smlsl2 v18.4S, \y4\().8H, z5
smlal2 v5.4S, \y4\().8H, z3
smlsl2 v6.4S, \y4\().8H, z1
add v19.4S, v19.4S, v7.4S
sub v20.4S, v20.4S, v16.4S
add v21.4S, v21.4S, v16.4S
sub v22.4S, v22.4S, v7.4S
\pass: add \y3\().4S, v19.4S, v17.4S
add \y4\().4S, v20.4S, v18.4S
shrn \y1\().4H, \y3\().4S, #ROW_SHIFT
shrn \y2\().4H, \y4\().4S, #ROW_SHIFT
add v7.4S, v21.4S, v5.4S
add v16.4S, v22.4S, v6.4S
shrn \y3\().4H, v7.4S, #ROW_SHIFT
shrn \y4\().4H, v16.4S, #ROW_SHIFT
sub v22.4S, v22.4S, v6.4S
sub v19.4S, v19.4S, v17.4S
sub v21.4S, v21.4S, v5.4S
shrn2 \y1\().8H, v22.4S, #ROW_SHIFT
sub v20.4S, v20.4S, v18.4S
shrn2 \y2\().8H, v21.4S, #ROW_SHIFT
shrn2 \y3\().8H, v20.4S, #ROW_SHIFT
shrn2 \y4\().8H, v19.4S, #ROW_SHIFT
trn1 v16.8H, \y1\().8H, \y2\().8H
trn2 v17.8H, \y1\().8H, \y2\().8H
trn1 v18.8H, \y3\().8H, \y4\().8H
trn2 v19.8H, \y3\().8H, \y4\().8H
trn1 \y1\().4S, v16.4S, v18.4S
trn1 \y2\().4S, v17.4S, v19.4S
trn2 \y3\().4S, v16.4S, v18.4S
trn2 \y4\().4S, v17.4S, v19.4S
.endm
.macro declare_idct_col4_neon i, l
function idct_col4_neon\i
dup v23.4H, z4c
.if \i == 1
add v23.4H, v23.4H, v24.4H
.else
mov v5.D[0], v24.D[1]
add v23.4H, v23.4H, v5.4H
.endif
smull v23.4S, v23.4H, z4
idct_col4_top v24, v25, v26, v27, \i, \l
mov x4, v28.D[\i - 1]
mov x5, v29.D[\i - 1]
cmp x4, #0
b.eq 1f
smull\i v7.4S, v28\l, z4
add v19.4S, v19.4S, v7.4S
sub v20.4S, v20.4S, v7.4S
sub v21.4S, v21.4S, v7.4S
add v22.4S, v22.4S, v7.4S
1: mov x4, v30.D[\i - 1]
cmp x5, #0
b.eq 2f
smlal\i v17.4S, v29\l, z5
smlsl\i v18.4S, v29\l, z1
smlal\i v5.4S, v29\l, z7
smlal\i v6.4S, v29\l, z3
2: mov x5, v31.D[\i - 1]
cmp x4, #0
b.eq 3f
smull\i v7.4S, v30\l, z6
smull\i v16.4S, v30\l, z2
add v19.4S, v19.4S, v7.4S
sub v22.4S, v22.4S, v7.4S
sub v20.4S, v20.4S, v16.4S
add v21.4S, v21.4S, v16.4S
3: cmp x5, #0
b.eq 4f
smlal\i v17.4S, v31\l, z7
smlsl\i v18.4S, v31\l, z5
smlal\i v5.4S, v31\l, z3
smlsl\i v6.4S, v31\l, z1
4: addhn v7.4H, v19.4S, v17.4S
addhn2 v7.8H, v20.4S, v18.4S
subhn v18.4H, v20.4S, v18.4S
subhn2 v18.8H, v19.4S, v17.4S
addhn v16.4H, v21.4S, v5.4S
addhn2 v16.8H, v22.4S, v6.4S
subhn v17.4H, v22.4S, v6.4S
subhn2 v17.8H, v21.4S, v5.4S
ret
endfunc
.endm
declare_idct_col4_neon 1, .4H
declare_idct_col4_neon 2, .8H
function ff_simple_idct_put_neon, export=1
idct_start x2
idct_row4_neon v24, v25, v26, v27, 1
idct_row4_neon v28, v29, v30, v31, 2
bl idct_col4_neon1
sqshrun v1.8B, v7.8H, #COL_SHIFT-16
sqshrun2 v1.16B, v16.8H, #COL_SHIFT-16
sqshrun v3.8B, v17.8H, #COL_SHIFT-16
sqshrun2 v3.16B, v18.8H, #COL_SHIFT-16
bl idct_col4_neon2
sqshrun v2.8B, v7.8H, #COL_SHIFT-16
sqshrun2 v2.16B, v16.8H, #COL_SHIFT-16
sqshrun v4.8B, v17.8H, #COL_SHIFT-16
sqshrun2 v4.16B, v18.8H, #COL_SHIFT-16
zip1 v16.4S, v1.4S, v2.4S
zip2 v17.4S, v1.4S, v2.4S
st1 {v16.D}[0], [x0], x1
st1 {v16.D}[1], [x0], x1
zip1 v18.4S, v3.4S, v4.4S
zip2 v19.4S, v3.4S, v4.4S
st1 {v17.D}[0], [x0], x1
st1 {v17.D}[1], [x0], x1
st1 {v18.D}[0], [x0], x1
st1 {v18.D}[1], [x0], x1
st1 {v19.D}[0], [x0], x1
st1 {v19.D}[1], [x0], x1
idct_end
endfunc
function ff_simple_idct_add_neon, export=1
idct_start x2
idct_row4_neon v24, v25, v26, v27, 1
idct_row4_neon v28, v29, v30, v31, 2
bl idct_col4_neon1
sshr v1.8H, v7.8H, #COL_SHIFT-16
sshr v2.8H, v16.8H, #COL_SHIFT-16
sshr v3.8H, v17.8H, #COL_SHIFT-16
sshr v4.8H, v18.8H, #COL_SHIFT-16
bl idct_col4_neon2
sshr v7.8H, v7.8H, #COL_SHIFT-16
sshr v16.8H, v16.8H, #COL_SHIFT-16
sshr v17.8H, v17.8H, #COL_SHIFT-16
sshr v18.8H, v18.8H, #COL_SHIFT-16
mov x9, x0
ld1 {v19.D}[0], [x0], x1
zip1 v23.2D, v1.2D, v7.2D
zip2 v24.2D, v1.2D, v7.2D
ld1 {v19.D}[1], [x0], x1
zip1 v25.2D, v2.2D, v16.2D
zip2 v26.2D, v2.2D, v16.2D
ld1 {v20.D}[0], [x0], x1
zip1 v27.2D, v3.2D, v17.2D
zip2 v28.2D, v3.2D, v17.2D
ld1 {v20.D}[1], [x0], x1
zip1 v29.2D, v4.2D, v18.2D
zip2 v30.2D, v4.2D, v18.2D
ld1 {v21.D}[0], [x0], x1
uaddw v23.8H, v23.8H, v19.8B
uaddw2 v24.8H, v24.8H, v19.16B
ld1 {v21.D}[1], [x0], x1
sqxtun v23.8B, v23.8H
sqxtun2 v23.16B, v24.8H
ld1 {v22.D}[0], [x0], x1
uaddw v24.8H, v25.8H, v20.8B
uaddw2 v25.8H, v26.8H, v20.16B
ld1 {v22.D}[1], [x0], x1
sqxtun v24.8B, v24.8H
sqxtun2 v24.16B, v25.8H
st1 {v23.D}[0], [x9], x1
uaddw v25.8H, v27.8H, v21.8B
uaddw2 v26.8H, v28.8H, v21.16B
st1 {v23.D}[1], [x9], x1
sqxtun v25.8B, v25.8H
sqxtun2 v25.16B, v26.8H
st1 {v24.D}[0], [x9], x1
uaddw v26.8H, v29.8H, v22.8B
uaddw2 v27.8H, v30.8H, v22.16B
st1 {v24.D}[1], [x9], x1
sqxtun v26.8B, v26.8H
sqxtun2 v26.16B, v27.8H
st1 {v25.D}[0], [x9], x1
st1 {v25.D}[1], [x9], x1
st1 {v26.D}[0], [x9], x1
st1 {v26.D}[1], [x9], x1
idct_end
endfunc
function ff_simple_idct_neon, export=1
idct_start x0
mov x2, x0
idct_row4_neon v24, v25, v26, v27, 1
idct_row4_neon v28, v29, v30, v31, 2
sub x2, x2, #128
bl idct_col4_neon1
sshr v1.8H, v7.8H, #COL_SHIFT-16
sshr v2.8H, v16.8H, #COL_SHIFT-16
sshr v3.8H, v17.8H, #COL_SHIFT-16
sshr v4.8H, v18.8H, #COL_SHIFT-16
bl idct_col4_neon2
sshr v7.8H, v7.8H, #COL_SHIFT-16
sshr v16.8H, v16.8H, #COL_SHIFT-16
sshr v17.8H, v17.8H, #COL_SHIFT-16
sshr v18.8H, v18.8H, #COL_SHIFT-16
zip1 v23.2D, v1.2D, v7.2D
zip2 v24.2D, v1.2D, v7.2D
st1 {v23.2D,v24.2D}, [x2], #32
zip1 v25.2D, v2.2D, v16.2D
zip2 v26.2D, v2.2D, v16.2D
st1 {v25.2D,v26.2D}, [x2], #32
zip1 v27.2D, v3.2D, v17.2D
zip2 v28.2D, v3.2D, v17.2D
st1 {v27.2D,v28.2D}, [x2], #32
zip1 v29.2D, v4.2D, v18.2D
zip2 v30.2D, v4.2D, v18.2D
st1 {v29.2D,v30.2D}, [x2], #32
idct_end
endfunc
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