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/*
* Copyright (c) 2016 Clément Bœsch <clement stupeflix.com>
*
* 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"
function ff_yuv2planeX_8_neon, export=1
ld1 {v0.8B}, [x5] // load 8x8-bit dither
cbz w6, 1f // check if offsetting present
ext v0.8B, v0.8B, v0.8B, #3 // honor offsetting which can be 0 or 3 only
1: uxtl v0.8H, v0.8B // extend dither to 16-bit
ushll v1.4S, v0.4H, #12 // extend dither to 32-bit with left shift by 12 (part 1)
ushll2 v2.4S, v0.8H, #12 // extend dither to 32-bit with left shift by 12 (part 2)
mov x7, #0 // i = 0
2: mov v3.16B, v1.16B // initialize accumulator part 1 with dithering value
mov v4.16B, v2.16B // initialize accumulator part 2 with dithering value
mov w8, w1 // tmpfilterSize = filterSize
mov x9, x2 // srcp = src
mov x10, x0 // filterp = filter
3: ldp x11, x12, [x9], #16 // get 2 pointers: src[j] and src[j+1]
add x11, x11, x7, lsl #1 // &src[j ][i]
add x12, x12, x7, lsl #1 // &src[j+1][i]
ld1 {v5.8H}, [x11] // read 8x16-bit @ src[j ][i + {0..7}]: A,B,C,D,E,F,G,H
ld1 {v6.8H}, [x12] // read 8x16-bit @ src[j+1][i + {0..7}]: I,J,K,L,M,N,O,P
ldr w11, [x10], #4 // read 2x16-bit coeffs (X, Y) at (filter[j], filter[j+1])
zip1 v16.8H, v5.8H, v6.8H // A,I,B,J,C,K,D,L
zip2 v17.8H, v5.8H, v6.8H // E,M,F,N,F,O,H,P
dup v7.4S, w11 // X,Y,X,Y,X,Y,X,Y
smull v18.4S, v16.4H, v7.4H // A.X I.Y B.X J.Y
smull v20.4S, v17.4H, v7.4H // E.X M.Y F.X N.Y
smull2 v19.4S, v16.8H, v7.8H // C.X K.Y D.X L.Y
smull2 v21.4S, v17.8H, v7.8H // G.X O.Y H.X P.Y
addp v16.4S, v18.4S, v19.4S // A.X+I.Y B.X+J.Y C.X+K.Y D.X+L.Y
addp v17.4S, v20.4S, v21.4S // E.X+M.Y F.X+N.Y F.X+O.Y H.X+P.Y
add v3.4S, v3.4S, v16.4S // update val accumulator for part 1
add v4.4S, v4.4S, v17.4S // update val accumulator for part 2
subs w8, w8, #2 // tmpfilterSize -= 2
b.gt 3b // loop until filterSize consumed
sshr v3.4S, v3.4S, #19 // val>>19 (part 1)
sshr v4.4S, v4.4S, #19 // val>>19 (part 2)
sqxtun v3.4H, v3.4S // clip16(val>>19) (part 1)
sqxtun v4.4H, v4.4S // clip16(val>>19) (part 2)
mov v3.D[1], v4.D[0] // merge part 1 and part 2
uqxtn v3.8B, v3.8H // clip8(val>>19)
st1 {v3.1D}, [x3], #8 // write to destination
add x7, x7, #8 // i += 8
subs w4, w4, #8 // dstW -= 8
b.gt 2b // loop until width consumed
ret
endfunc
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