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/*
* Copyright (c) 2018 Clément Bœsch <u pkh me>
*
* 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"
// acc_sum_store(ABCD) = {X+A, X+A+B, X+A+B+C, X+A+B+C+D}
.macro acc_sum_store x, xb
dup v24.4S, v24.4S[3] // ...X -> XXXX
ext v25.16B, v26.16B, \xb, #12 // ext(0000,ABCD,12)=0ABC
add v24.4S, v24.4S, \x // XXXX+ABCD={X+A,X+B,X+C,X+D}
add v24.4S, v24.4S, v25.4S // {X+A,X+B+A,X+C+B,X+D+C} (+0ABC)
ext v25.16B, v26.16B, v25.16B, #12 // ext(0000,0ABC,12)=00AB
add v24.4S, v24.4S, v25.4S // {X+A,X+B+A,X+C+B+A,X+D+C+B} (+00AB)
ext v25.16B, v26.16B, v25.16B, #12 // ext(0000,00AB,12)=000A
add v24.4S, v24.4S, v25.4S // {X+A,X+B+A,X+C+B+A,X+D+C+B+A} (+000A)
st1 {v24.4S}, [x0], #16 // write 4x32-bit final values
.endm
function ff_compute_safe_ssd_integral_image_neon, export=1
movi v26.4S, #0 // used as zero for the "rotations" in acc_sum_store
sub x3, x3, w6, UXTW // s1 padding (s1_linesize - w)
sub x5, x5, w6, UXTW // s2 padding (s2_linesize - w)
sub x9, x0, x1, UXTW #2 // dst_top
sub x1, x1, w6, UXTW // dst padding (dst_linesize_32 - w)
lsl x1, x1, #2 // dst padding expressed in bytes
1: mov w10, w6 // width copy for each line
sub x0, x0, #16 // beginning of the dst line minus 4 sums
sub x8, x9, #4 // dst_top-1
ld1 {v24.4S}, [x0], #16 // load ...X (contextual last sums)
2: ld1 {v0.16B}, [x2], #16 // s1[x + 0..15]
ld1 {v1.16B}, [x4], #16 // s2[x + 0..15]
ld1 {v16.4S,v17.4S}, [x8], #32 // dst_top[x + 0..7 - 1]
usubl v2.8H, v0.8B, v1.8B // d[x + 0..7] = s1[x + 0..7] - s2[x + 0..7]
usubl2 v3.8H, v0.16B, v1.16B // d[x + 8..15] = s1[x + 8..15] - s2[x + 8..15]
ld1 {v18.4S,v19.4S}, [x8], #32 // dst_top[x + 8..15 - 1]
smull v4.4S, v2.4H, v2.4H // d[x + 0..3]^2
smull2 v5.4S, v2.8H, v2.8H // d[x + 4..7]^2
ld1 {v20.4S,v21.4S}, [x9], #32 // dst_top[x + 0..7]
smull v6.4S, v3.4H, v3.4H // d[x + 8..11]^2
smull2 v7.4S, v3.8H, v3.8H // d[x + 12..15]^2
ld1 {v22.4S,v23.4S}, [x9], #32 // dst_top[x + 8..15]
sub v0.4S, v20.4S, v16.4S // dst_top[x + 0..3] - dst_top[x + 0..3 - 1]
sub v1.4S, v21.4S, v17.4S // dst_top[x + 4..7] - dst_top[x + 4..7 - 1]
add v0.4S, v0.4S, v4.4S // + d[x + 0..3]^2
add v1.4S, v1.4S, v5.4S // + d[x + 4..7]^2
sub v2.4S, v22.4S, v18.4S // dst_top[x + 8..11] - dst_top[x + 8..11 - 1]
sub v3.4S, v23.4S, v19.4S // dst_top[x + 12..15] - dst_top[x + 12..15 - 1]
add v2.4S, v2.4S, v6.4S // + d[x + 8..11]^2
add v3.4S, v3.4S, v7.4S // + d[x + 12..15]^2
acc_sum_store v0.4S, v0.16B // accumulate and store dst[ 0..3]
acc_sum_store v1.4S, v1.16B // accumulate and store dst[ 4..7]
acc_sum_store v2.4S, v2.16B // accumulate and store dst[ 8..11]
acc_sum_store v3.4S, v3.16B // accumulate and store dst[12..15]
subs w10, w10, #16 // width dec
b.ne 2b // loop til next line
add x2, x2, x3 // skip to next line (s1)
add x4, x4, x5 // skip to next line (s2)
add x0, x0, x1 // skip to next line (dst)
add x9, x9, x1 // skip to next line (dst_top)
subs w7, w7, #1 // height dec
b.ne 1b
ret
endfunc
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