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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
ld1r {v7.8H}, [x10], #2 // read 1x16-bit coeff X at filter[j ] and duplicate across lanes
ld1r {v8.8H}, [x10], #2 // read 1x16-bit coeff Y at filter[j+1] and duplicate across lanes
smlal v3.4S, v5.4H, v7.4H // val0 += {A,B,C,D} * X
smlal2 v4.4S, v5.8H, v7.8H // val1 += {E,F,G,H} * X
smlal v3.4S, v6.4H, v8.4H // val0 += {I,J,K,L} * Y
smlal2 v4.4S, v6.8H, v8.8H // val1 += {M,N,O,P} * Y
subs w8, w8, #2 // tmpfilterSize -= 2
b.gt 3b // loop until filterSize consumed
sqshrun v3.4h, v3.4s, #16 // clip16(val0>>16)
sqshrun2 v3.8h, v4.4s, #16 // clip16(val1>>16)
uqshrn v3.8b, v3.8h, #3 // clip8(val>>19)
st1 {v3.8b}, [x3], #8 // write to destination
subs w4, w4, #8 // dstW -= 8
add x7, x7, #8 // i += 8
b.gt 2b // loop until width consumed
ret
endfunc
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