ref: ea54dbe2a89d3eb4edbdbbf1810180984467c6aa
dir: /src/arm/64/looprestoration_common.S/
/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Martin Storsjo
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "src/arm/asm.S"
#include "util.S"
#define SUM_STRIDE (384+16)
// void dav1d_sgr_box3_v_neon(int32_t *sumsq, int16_t *sum,
// const int w, const int h,
// const enum LrEdgeFlags edges);
function sgr_box3_v_neon, export=1
add w10, w3, #2 // Number of output rows to move back
mov w11, w3 // Number of input rows to move back
add w2, w2, #2 // Actual summed width
mov x7, #(4*SUM_STRIDE) // sumsq stride
mov x8, #(2*SUM_STRIDE) // sum stride
sub x0, x0, #(4*SUM_STRIDE) // sumsq -= stride
sub x1, x1, #(2*SUM_STRIDE) // sum -= stride
tst w4, #4 // LR_HAVE_TOP
b.eq 0f
// If have top, read from row -2.
sub x5, x0, #(4*SUM_STRIDE)
sub x6, x1, #(2*SUM_STRIDE)
add w11, w11, #2
b 1f
0:
// !LR_HAVE_TOP
// If we don't have top, read from row 0 even if
// we start writing to row -1.
add x5, x0, #(4*SUM_STRIDE)
add x6, x1, #(2*SUM_STRIDE)
1:
tst w4, #8 // LR_HAVE_BOTTOM
b.eq 1f
// LR_HAVE_BOTTOM
add w3, w3, #2 // Sum all h+2 lines with the main loop
add w11, w11, #2
1:
mov w9, w3 // Backup of h for next loops
1:
// Start of horizontal loop; start one vertical filter slice.
// Start loading rows into v16-v21 and v24-v26 taking top
// padding into consideration.
tst w4, #4 // LR_HAVE_TOP
ld1 {v16.4s, v17.4s}, [x5], x7
ld1 {v24.8h}, [x6], x8
b.eq 2f
// LR_HAVE_TOP
ld1 {v18.4s, v19.4s}, [x5], x7
ld1 {v25.8h}, [x6], x8
ld1 {v20.4s, v21.4s}, [x5], x7
ld1 {v26.8h}, [x6], x8
b 3f
2: // !LR_HAVE_TOP
mov v18.16b, v16.16b
mov v19.16b, v17.16b
mov v25.16b, v24.16b
mov v20.16b, v16.16b
mov v21.16b, v17.16b
mov v26.16b, v24.16b
3:
subs w3, w3, #1
.macro add3
add v16.4s, v16.4s, v18.4s
add v17.4s, v17.4s, v19.4s
add v24.8h, v24.8h, v25.8h
add v16.4s, v16.4s, v20.4s
add v17.4s, v17.4s, v21.4s
add v24.8h, v24.8h, v26.8h
st1 {v16.4s, v17.4s}, [x0], x7
st1 {v24.8h}, [x1], x8
.endm
add3
mov v16.16b, v18.16b
mov v17.16b, v19.16b
mov v24.16b, v25.16b
mov v18.16b, v20.16b
mov v19.16b, v21.16b
mov v25.16b, v26.16b
b.le 4f
ld1 {v20.4s, v21.4s}, [x5], x7
ld1 {v26.8h}, [x6], x8
b 3b
4:
tst w4, #8 // LR_HAVE_BOTTOM
b.ne 5f
// !LR_HAVE_BOTTOM
// Produce two more rows, extending the already loaded rows.
add3
mov v16.16b, v18.16b
mov v17.16b, v19.16b
mov v24.16b, v25.16b
add3
5: // End of one vertical slice.
subs w2, w2, #8
b.le 0f
// Move pointers back up to the top and loop horizontally.
// Input pointers
msub x5, x7, x11, x5
msub x6, x8, x11, x6
// Output pointers
msub x0, x7, x10, x0
msub x1, x8, x10, x1
add x0, x0, #32
add x1, x1, #16
add x5, x5, #32
add x6, x6, #16
mov w3, w9
b 1b
0:
ret
.purgem add3
endfunc
// void dav1d_sgr_box5_v_neon(int32_t *sumsq, int16_t *sum,
// const int w, const int h,
// const enum LrEdgeFlags edges);
function sgr_box5_v_neon, export=1
add w10, w3, #2 // Number of output rows to move back
mov w11, w3 // Number of input rows to move back
add w2, w2, #8 // Actual summed width
mov x7, #(4*SUM_STRIDE) // sumsq stride
mov x8, #(2*SUM_STRIDE) // sum stride
sub x0, x0, #(4*SUM_STRIDE) // sumsq -= stride
sub x1, x1, #(2*SUM_STRIDE) // sum -= stride
tst w4, #4 // LR_HAVE_TOP
b.eq 0f
// If have top, read from row -2.
sub x5, x0, #(4*SUM_STRIDE)
sub x6, x1, #(2*SUM_STRIDE)
add w11, w11, #2
b 1f
0:
// !LR_HAVE_TOP
// If we don't have top, read from row 0 even if
// we start writing to row -1.
add x5, x0, #(4*SUM_STRIDE)
add x6, x1, #(2*SUM_STRIDE)
1:
tst w4, #8 // LR_HAVE_BOTTOM
b.eq 0f
// LR_HAVE_BOTTOM
add w3, w3, #2 // Handle h+2 lines with the main loop
add w11, w11, #2
b 1f
0:
// !LR_HAVE_BOTTOM
sub w3, w3, #1 // Handle h-1 lines with the main loop
1:
mov w9, w3 // Backup of h for next loops
1:
// Start of horizontal loop; start one vertical filter slice.
// Start loading rows into v16-v25 and v26-v30 taking top
// padding into consideration.
tst w4, #4 // LR_HAVE_TOP
ld1 {v16.4s, v17.4s}, [x5], x7
ld1 {v26.8h}, [x6], x8
b.eq 2f
// LR_HAVE_TOP
ld1 {v20.4s, v21.4s}, [x5], x7
ld1 {v28.8h}, [x6], x8
mov v18.16b, v16.16b
mov v19.16b, v17.16b
mov v27.16b, v26.16b
ld1 {v22.4s, v23.4s}, [x5], x7
ld1 {v29.8h}, [x6], x8
b 3f
2: // !LR_HAVE_TOP
mov v18.16b, v16.16b
mov v19.16b, v17.16b
mov v27.16b, v26.16b
mov v20.16b, v16.16b
mov v21.16b, v17.16b
mov v28.16b, v26.16b
mov v22.16b, v16.16b
mov v23.16b, v17.16b
mov v29.16b, v26.16b
3:
cbz w3, 4f
ld1 {v24.4s, v25.4s}, [x5], x7
ld1 {v30.8h}, [x6], x8
3:
// Start of vertical loop
subs w3, w3, #2
.macro add5
add v16.4s, v16.4s, v18.4s
add v17.4s, v17.4s, v19.4s
add v26.8h, v26.8h, v27.8h
add v0.4s, v20.4s, v22.4s
add v1.4s, v21.4s, v23.4s
add v2.8h, v28.8h, v29.8h
add v16.4s, v16.4s, v24.4s
add v17.4s, v17.4s, v25.4s
add v26.8h, v26.8h, v30.8h
add v16.4s, v16.4s, v0.4s
add v17.4s, v17.4s, v1.4s
add v26.8h, v26.8h, v2.8h
st1 {v16.4s, v17.4s}, [x0], x7
st1 {v26.8h}, [x1], x8
.endm
add5
.macro shift2
mov v16.16b, v20.16b
mov v17.16b, v21.16b
mov v26.16b, v28.16b
mov v18.16b, v22.16b
mov v19.16b, v23.16b
mov v27.16b, v29.16b
mov v20.16b, v24.16b
mov v21.16b, v25.16b
mov v28.16b, v30.16b
.endm
shift2
add x0, x0, x7
add x1, x1, x8
b.le 5f
ld1 {v22.4s, v23.4s}, [x5], x7
ld1 {v29.8h}, [x6], x8
ld1 {v24.4s, v25.4s}, [x5], x7
ld1 {v30.8h}, [x6], x8
b 3b
4:
// h == 1, !LR_HAVE_BOTTOM.
// Pad the last row with the only content row, and add.
mov v24.16b, v22.16b
mov v25.16b, v23.16b
mov v30.16b, v29.16b
add5
shift2
add x0, x0, x7
add x1, x1, x8
add5
b 6f
5:
tst w4, #8 // LR_HAVE_BOTTOM
b.ne 6f
// !LR_HAVE_BOTTOM
cbnz w3, 5f
// The intended three edge rows left; output the one at h-2 and
// the past edge one at h.
ld1 {v22.4s, v23.4s}, [x5], x7
ld1 {v29.8h}, [x6], x8
// Pad the past-edge row from the last content row.
mov v24.16b, v22.16b
mov v25.16b, v23.16b
mov v30.16b, v29.16b
add5
shift2
add x0, x0, x7
add x1, x1, x8
// The last two rows are already padded properly here.
add5
b 6f
5:
// w3 == -1, two rows left, output one.
// Pad the last two rows from the mid one.
mov v22.16b, v20.16b
mov v23.16b, v21.16b
mov v29.16b, v28.16b
mov v24.16b, v20.16b
mov v25.16b, v21.16b
mov v30.16b, v28.16b
add5
add x0, x0, x7
add x1, x1, x8
b 6f
6: // End of one vertical slice.
subs w2, w2, #8
b.le 0f
// Move pointers back up to the top and loop horizontally.
// Input pointers
msub x5, x7, x11, x5
msub x6, x8, x11, x6
// Output pointers
msub x0, x7, x10, x0
msub x1, x8, x10, x1
add x0, x0, #32
add x1, x1, #16
add x5, x5, #32
add x6, x6, #16
mov w3, w9
b 1b
0:
ret
.purgem add5
endfunc
// void dav1d_sgr_calc_ab1_neon(int32_t *a, int16_t *b,
// const int w, const int h, const int strength,
// const int bitdepth_max);
// void dav1d_sgr_calc_ab2_neon(int32_t *a, int16_t *b,
// const int w, const int h, const int strength,
// const int bitdepth_max);
function sgr_calc_ab1_neon, export=1
clz w9, w5
add x3, x3, #2 // h += 2
movi v31.4s, #9 // n
mov x5, #455
mov x8, #SUM_STRIDE
b sgr_calc_ab_neon
endfunc
function sgr_calc_ab2_neon, export=1
clz w9, w5
add x3, x3, #3 // h += 3
asr x3, x3, #1 // h /= 2
movi v31.4s, #25 // n
mov x5, #164
mov x8, #(2*SUM_STRIDE)
endfunc
function sgr_calc_ab_neon
sub w9, w9, #24 // -bitdepth_min_8
movrel x12, X(sgr_x_by_x)
ld1 {v16.16b, v17.16b, v18.16b}, [x12]
dup v6.8h, w9 // -bitdepth_min_8
movi v19.16b, #5
movi v20.8b, #55 // idx of last 5
movi v21.8b, #72 // idx of last 4
movi v22.8b, #101 // idx of last 3
movi v23.8b, #169 // idx of last 2
movi v24.8b, #254 // idx of last 1
saddl v7.4s, v6.4h, v6.4h // -2*bitdepth_min_8
add x2, x2, #2 // w += 2
add x7, x2, #7
bic x7, x7, #7 // aligned w
sub x7, x8, x7 // increment between rows
movi v29.8h, #1, lsl #8
dup v28.4s, w4
dup v30.4s, w5 // one_by_x
sub x0, x0, #(4*(SUM_STRIDE))
sub x1, x1, #(2*(SUM_STRIDE))
mov x6, x2 // backup of w
sub v16.16b, v16.16b, v19.16b
sub v17.16b, v17.16b, v19.16b
sub v18.16b, v18.16b, v19.16b
1:
subs x2, x2, #8
ld1 {v0.4s, v1.4s}, [x0] // a
ld1 {v2.8h}, [x1] // b
srshl v0.4s, v0.4s, v7.4s
srshl v1.4s, v1.4s, v7.4s
srshl v4.8h, v2.8h, v6.8h
mul v0.4s, v0.4s, v31.4s // a * n
mul v1.4s, v1.4s, v31.4s // a * n
umull v3.4s, v4.4h, v4.4h // b * b
umull2 v4.4s, v4.8h, v4.8h // b * b
uqsub v0.4s, v0.4s, v3.4s // imax(a * n - b * b, 0)
uqsub v1.4s, v1.4s, v4.4s // imax(a * n - b * b, 0)
mul v0.4s, v0.4s, v28.4s // p * s
mul v1.4s, v1.4s, v28.4s // p * s
uqshrn v0.4h, v0.4s, #16
uqshrn2 v0.8h, v1.4s, #16
uqrshrn v0.8b, v0.8h, #4 // imin(z, 255)
cmhi v25.8b, v0.8b, v20.8b // = -1 if sgr_x_by_x[v0] < 5
cmhi v26.8b, v0.8b, v21.8b // = -1 if sgr_x_by_x[v0] < 4
tbl v1.8b, {v16.16b, v17.16b, v18.16b}, v0.8b
cmhi v27.8b, v0.8b, v22.8b // = -1 if sgr_x_by_x[v0] < 3
cmhi v4.8b, v0.8b, v23.8b // = -1 if sgr_x_by_x[v0] < 2
add v25.8b, v25.8b, v26.8b
cmhi v5.8b, v0.8b, v24.8b // = -1 if sgr_x_by_x[v0] < 1
add v27.8b, v27.8b, v4.8b
add v5.8b, v5.8b, v19.8b
add v25.8b, v25.8b, v27.8b
add v1.8b, v1.8b, v5.8b
add v1.8b, v1.8b, v25.8b
uxtl v1.8h, v1.8b // x
umull v3.4s, v1.4h, v2.4h // x * BB[i]
umull2 v4.4s, v1.8h, v2.8h // x * BB[i]
mul v3.4s, v3.4s, v30.4s // x * BB[i] * sgr_one_by_x
mul v4.4s, v4.4s, v30.4s // x * BB[i] * sgr_one_by_x
srshr v3.4s, v3.4s, #12 // AA[i]
srshr v4.4s, v4.4s, #12 // AA[i]
sub v2.8h, v29.8h, v1.8h // 256 - x
st1 {v3.4s, v4.4s}, [x0], #32
st1 {v2.8h}, [x1], #16
b.gt 1b
subs x3, x3, #1
b.le 0f
add x0, x0, x7, lsl #2
add x1, x1, x7, lsl #1
mov x2, x6
b 1b
0:
ret
endfunc