ref: 8e379f1d64bf09224ce2863b0d8aeb7cbfde92d6
dir: /src/arm/64/looprestoration.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"
// void dav1d_wiener_filter_h_neon(int16_t *dst, const pixel (*left)[4],
// const pixel *src, ptrdiff_t stride,
// const int16_t fh[7], const intptr_t w,
// int h, enum LrEdgeFlags edges);
function wiener_filter_h_neon, export=1
mov w8, w5
ld1 {v0.8h}, [x4]
mov w9, #(1 << 14) - (1 << 2)
dup v30.8h, w9
movi v31.8h, #8, lsl #8
// Calculate mid_stride
add w10, w5, #7
bic w10, w10, #7
lsl w10, w10, #1
// Clear the last unused element of v0, to allow filtering a single
// pixel with one plain mul+addv.
ins v0.h[7], wzr
// Set up pointers for reading/writing alternate rows
add x12, x0, x10
lsl w10, w10, #1
add x13, x2, x3
lsl x3, x3, #1
// Subtract the width from mid_stride
sub x10, x10, w5, uxtw #1
// For w >= 8, we read (w+5)&~7+8 pixels, for w < 8 we read 16 pixels.
cmp w5, #8
add w11, w5, #13
bic w11, w11, #7
b.ge 1f
mov w11, #16
1:
sub x3, x3, w11, uxtw
// Set up the src pointers to include the left edge, for LR_HAVE_LEFT, left == NULL
tst w7, #1 // LR_HAVE_LEFT
b.eq 2f
// LR_HAVE_LEFT
cbnz x1, 0f
// left == NULL
sub x2, x2, #3
sub x13, x13, #3
b 1f
0: // LR_HAVE_LEFT, left != NULL
2: // !LR_HAVE_LEFT, increase the stride.
// For this case we don't read the left 3 pixels from the src pointer,
// but shift it as if we had done that.
add x3, x3, #3
1: // Loop vertically
ld1 {v3.16b}, [x2], #16
ld1 {v5.16b}, [x13], #16
tst w7, #1 // LR_HAVE_LEFT
b.eq 0f
cbz x1, 2f
// LR_HAVE_LEFT, left != NULL
ld1 {v2.s}[3], [x1], #4
// Move x2/x13 back to account for the last 3 bytes we loaded earlier,
// which we'll shift out.
sub x2, x2, #3
sub x13, x13, #3
ld1 {v4.s}[3], [x1], #4
ext v3.16b, v2.16b, v3.16b, #13
ext v5.16b, v4.16b, v5.16b, #13
b 2f
0:
// !LR_HAVE_LEFT, fill v2 with the leftmost byte
// and shift v3 to have 3x the first byte at the front.
dup v2.16b, v3.b[0]
dup v4.16b, v5.b[0]
// Move x2 back to account for the last 3 bytes we loaded before,
// which we shifted out.
sub x2, x2, #3
sub x13, x13, #3
ext v3.16b, v2.16b, v3.16b, #13
ext v5.16b, v4.16b, v5.16b, #13
2:
uxtl v2.8h, v3.8b
uxtl2 v3.8h, v3.16b
uxtl v4.8h, v5.8b
uxtl2 v5.8h, v5.16b
tst w7, #2 // LR_HAVE_RIGHT
b.ne 4f
// If we'll need to pad the right edge, load that byte to pad with
// here since we can find it pretty easily from here.
sub w9, w5, #14
ldr b28, [x2, w9, sxtw]
ldr b29, [x13, w9, sxtw]
// Fill v28/v29 with the right padding pixel
dup v28.8b, v28.b[0]
dup v29.8b, v29.b[0]
uxtl v28.8h, v28.8b
uxtl v29.8h, v29.8b
3: // !LR_HAVE_RIGHT
// If we'll have to pad the right edge we need to quit early here.
cmp w5, #11
b.ge 4f // If w >= 11, all used input pixels are valid
cmp w5, #7
b.ge 5f // If w >= 7, we can filter 4 pixels
b 6f
4: // Loop horizontally
.macro filter wd
// Interleaving the mul/mla chains actually hurts performance
// significantly on Cortex A53, thus keeping mul/mla tightly
// chained like this.
ext v16.16b, v2.16b, v3.16b, #2
ext v17.16b, v2.16b, v3.16b, #4
ext v18.16b, v2.16b, v3.16b, #6
ext v19.16b, v2.16b, v3.16b, #8
ext v20.16b, v2.16b, v3.16b, #10
ext v21.16b, v2.16b, v3.16b, #12
mul v6\wd, v2\wd, v0.h[0]
mla v6\wd, v16\wd, v0.h[1]
mla v6\wd, v17\wd, v0.h[2]
mla v6\wd, v18\wd, v0.h[3]
mla v6\wd, v19\wd, v0.h[4]
mla v6\wd, v20\wd, v0.h[5]
mla v6\wd, v21\wd, v0.h[6]
ext v22.16b, v4.16b, v5.16b, #2
ext v23.16b, v4.16b, v5.16b, #4
ext v24.16b, v4.16b, v5.16b, #6
ext v25.16b, v4.16b, v5.16b, #8
ext v26.16b, v4.16b, v5.16b, #10
ext v27.16b, v4.16b, v5.16b, #12
mul v7\wd, v4\wd, v0.h[0]
mla v7\wd, v22\wd, v0.h[1]
mla v7\wd, v23\wd, v0.h[2]
mla v7\wd, v24\wd, v0.h[3]
mla v7\wd, v25\wd, v0.h[4]
mla v7\wd, v26\wd, v0.h[5]
mla v7\wd, v27\wd, v0.h[6]
shl v18\wd, v18\wd, #7
shl v24\wd, v24\wd, #7
sub v18\wd, v18\wd, v30\wd
sub v24\wd, v24\wd, v30\wd
sqadd v6\wd, v6\wd, v18\wd
sqadd v7\wd, v7\wd, v24\wd
sshr v6\wd, v6\wd, #3
sshr v7\wd, v7\wd, #3
add v6\wd, v6\wd, v31\wd
add v7\wd, v7\wd, v31\wd
.endm
filter .8h
st1 {v6.8h}, [x0], #16
st1 {v7.8h}, [x12], #16
subs w5, w5, #8
b.le 9f
tst w7, #2 // LR_HAVE_RIGHT
mov v2.16b, v3.16b
mov v4.16b, v5.16b
ld1 {v3.8b}, [x2], #8
ld1 {v5.8b}, [x13], #8
uxtl v3.8h, v3.8b
uxtl v5.8h, v5.8b
b.ne 4b // If we don't need to pad, just keep filtering.
b 3b // If we need to pad, check how many pixels we have left.
5: // Filter 4 pixels, 7 <= w < 11
filter .4h
st1 {v6.4h}, [x0], #8
st1 {v7.4h}, [x12], #8
subs w5, w5, #4 // 3 <= w < 7
ext v2.16b, v2.16b, v3.16b, #8
ext v3.16b, v3.16b, v3.16b, #8
ext v4.16b, v4.16b, v5.16b, #8
ext v5.16b, v5.16b, v5.16b, #8
6: // Pad the right edge and filter the last few pixels.
// w < 7, w+3 pixels valid in v2-v3
cmp w5, #5
b.lt 7f
b.gt 8f
// w == 5, 8 pixels valid in v2, v3 invalid
mov v3.16b, v28.16b
mov v5.16b, v29.16b
b 88f
7: // 1 <= w < 5, 4-7 pixels valid in v2
sub w9, w5, #1
// w9 = (pixels valid - 4)
adr x11, L(variable_shift_tbl)
ldrh w9, [x11, w9, uxtw #1]
sub x11, x11, w9, uxth
mov v3.16b, v28.16b
mov v5.16b, v29.16b
br x11
// Shift v2 right, shifting out invalid pixels,
// shift v2 left to the original offset, shifting in padding pixels.
44: // 4 pixels valid
ext v2.16b, v2.16b, v2.16b, #8
ext v2.16b, v2.16b, v3.16b, #8
ext v4.16b, v4.16b, v4.16b, #8
ext v4.16b, v4.16b, v5.16b, #8
b 88f
55: // 5 pixels valid
ext v2.16b, v2.16b, v2.16b, #10
ext v2.16b, v2.16b, v3.16b, #6
ext v4.16b, v4.16b, v4.16b, #10
ext v4.16b, v4.16b, v5.16b, #6
b 88f
66: // 6 pixels valid
ext v2.16b, v2.16b, v2.16b, #12
ext v2.16b, v2.16b, v3.16b, #4
ext v4.16b, v4.16b, v4.16b, #12
ext v4.16b, v4.16b, v5.16b, #4
b 88f
77: // 7 pixels valid
ext v2.16b, v2.16b, v2.16b, #14
ext v2.16b, v2.16b, v3.16b, #2
ext v4.16b, v4.16b, v4.16b, #14
ext v4.16b, v4.16b, v5.16b, #2
b 88f
L(variable_shift_tbl):
.hword L(variable_shift_tbl) - 44b
.hword L(variable_shift_tbl) - 55b
.hword L(variable_shift_tbl) - 66b
.hword L(variable_shift_tbl) - 77b
8: // w > 5, w == 6, 9 pixels valid in v2-v3, 1 pixel valid in v3
ins v28.h[0], v3.h[0]
ins v29.h[0], v5.h[0]
mov v3.16b, v28.16b
mov v5.16b, v29.16b
88:
// w < 7, v2-v3 padded properly
cmp w5, #4
b.lt 888f
// w >= 4, filter 4 pixels
filter .4h
st1 {v6.4h}, [x0], #8
st1 {v7.4h}, [x12], #8
subs w5, w5, #4 // 0 <= w < 4
ext v2.16b, v2.16b, v3.16b, #8
ext v4.16b, v4.16b, v5.16b, #8
b.eq 9f
888: // 1 <= w < 4, filter 1 pixel at a time
mul v6.8h, v2.8h, v0.8h
mul v7.8h, v4.8h, v0.8h
addv h6, v6.8h
addv h7, v7.8h
dup v16.4h, v2.h[3]
ins v16.h[1], v4.h[3]
ins v6.h[1], v7.h[0]
shl v16.4h, v16.4h, #7
sub v16.4h, v16.4h, v30.4h
sqadd v6.4h, v6.4h, v16.4h
sshr v6.4h, v6.4h, #3
add v6.4h, v6.4h, v31.4h
st1 {v6.h}[0], [x0], #2
st1 {v6.h}[1], [x12], #2
subs w5, w5, #1
ext v2.16b, v2.16b, v3.16b, #2
ext v4.16b, v4.16b, v5.16b, #2
b.gt 888b
9:
subs w6, w6, #2
b.le 0f
// Jump to the next row and loop horizontally
add x0, x0, x10
add x12, x12, x10
add x2, x2, x3
add x13, x13, x3
mov w5, w8
b 1b
0:
ret
.purgem filter
endfunc
// void dav1d_wiener_filter_v_neon(pixel *dst, ptrdiff_t stride,
// const int16_t *mid, int w, int h,
// const int16_t fv[7], enum LrEdgeFlags edges,
// ptrdiff_t mid_stride);
function wiener_filter_v_neon, export=1
mov w8, w4
ld1 {v0.8h}, [x5]
movi v1.8h, #128
add v1.8h, v1.8h, v0.8h
// Calculate the number of rows to move back when looping vertically
mov w11, w4
tst w6, #4 // LR_HAVE_TOP
b.eq 0f
sub x2, x2, x7, lsl #1
add w11, w11, #2
0:
tst w6, #8 // LR_HAVE_BOTTOM
b.eq 1f
add w11, w11, #2
1: // Start of horizontal loop; start one vertical filter slice.
// Load rows into v16-v19 and pad properly.
tst w6, #4 // LR_HAVE_TOP
ld1 {v16.8h}, [x2], x7
b.eq 2f
// LR_HAVE_TOP
ld1 {v18.8h}, [x2], x7
mov v17.16b, v16.16b
ld1 {v19.8h}, [x2], x7
b 3f
2: // !LR_HAVE_TOP
mov v17.16b, v16.16b
mov v18.16b, v16.16b
mov v19.16b, v16.16b
3:
cmp w4, #4
b.lt 5f
// Start filtering normally; fill in v20-v22 with unique rows.
ld1 {v20.8h}, [x2], x7
ld1 {v21.8h}, [x2], x7
ld1 {v22.8h}, [x2], x7
4:
.macro filter compare
subs w4, w4, #1
// Interleaving the mul/mla chains actually hurts performance
// significantly on Cortex A53, thus keeping mul/mla tightly
// chained like this.
smull v2.4s, v16.4h, v0.h[0]
smlal v2.4s, v17.4h, v0.h[1]
smlal v2.4s, v18.4h, v0.h[2]
smlal v2.4s, v19.4h, v1.h[3]
smlal v2.4s, v20.4h, v0.h[4]
smlal v2.4s, v21.4h, v0.h[5]
smlal v2.4s, v22.4h, v0.h[6]
smull2 v3.4s, v16.8h, v0.h[0]
smlal2 v3.4s, v17.8h, v0.h[1]
smlal2 v3.4s, v18.8h, v0.h[2]
smlal2 v3.4s, v19.8h, v1.h[3]
smlal2 v3.4s, v20.8h, v0.h[4]
smlal2 v3.4s, v21.8h, v0.h[5]
smlal2 v3.4s, v22.8h, v0.h[6]
sqrshrun v2.4h, v2.4s, #11
sqrshrun2 v2.8h, v3.4s, #11
sqxtun v2.8b, v2.8h
st1 {v2.8b}, [x0], x1
.if \compare
cmp w4, #4
.else
b.le 9f
.endif
mov v16.16b, v17.16b
mov v17.16b, v18.16b
mov v18.16b, v19.16b
mov v19.16b, v20.16b
mov v20.16b, v21.16b
mov v21.16b, v22.16b
.endm
filter 1
b.lt 7f
ld1 {v22.8h}, [x2], x7
b 4b
5: // Less than 4 rows in total; not all of v20-v21 are filled yet.
tst w6, #8 // LR_HAVE_BOTTOM
b.eq 6f
// LR_HAVE_BOTTOM
cmp w4, #2
// We load at least 2 rows in all cases.
ld1 {v20.8h}, [x2], x7
ld1 {v21.8h}, [x2], x7
b.gt 53f // 3 rows in total
b.eq 52f // 2 rows in total
51: // 1 row in total, v19 already loaded, load edge into v20-v22.
mov v22.16b, v21.16b
b 8f
52: // 2 rows in total, v19 already loaded, load v20 with content data
// and 2 rows of edge.
ld1 {v22.8h}, [x2], x7
mov v23.16b, v22.16b
b 8f
53:
// 3 rows in total, v19 already loaded, load v20 and v21 with content
// and 2 rows of edge.
ld1 {v22.8h}, [x2], x7
ld1 {v23.8h}, [x2], x7
mov v24.16b, v23.16b
b 8f
6:
// !LR_HAVE_BOTTOM
cmp w4, #2
b.gt 63f // 3 rows in total
b.eq 62f // 2 rows in total
61: // 1 row in total, v19 already loaded, pad that into v20-v22.
mov v20.16b, v19.16b
mov v21.16b, v19.16b
mov v22.16b, v19.16b
b 8f
62: // 2 rows in total, v19 already loaded, load v20 and pad that into v21-v23.
ld1 {v20.8h}, [x2], x7
mov v21.16b, v20.16b
mov v22.16b, v20.16b
mov v23.16b, v20.16b
b 8f
63:
// 3 rows in total, v19 already loaded, load v20 and v21 and pad v21 into v22-v24.
ld1 {v20.8h}, [x2], x7
ld1 {v21.8h}, [x2], x7
mov v22.16b, v21.16b
mov v23.16b, v21.16b
mov v24.16b, v21.16b
b 8f
7:
// All registers up to v21 are filled already, 3 valid rows left.
// < 4 valid rows left; fill in padding and filter the last
// few rows.
tst w6, #8 // LR_HAVE_BOTTOM
b.eq 71f
// LR_HAVE_BOTTOM; load 2 rows of edge.
ld1 {v22.8h}, [x2], x7
ld1 {v23.8h}, [x2], x7
mov v24.16b, v23.16b
b 8f
71:
// !LR_HAVE_BOTTOM, pad 3 rows
mov v22.16b, v21.16b
mov v23.16b, v21.16b
mov v24.16b, v21.16b
8: // At this point, all registers up to v22-v24 are loaded with
// edge/padding (depending on how many rows are left).
filter 0 // This branches to 9f when done
mov v22.16b, v23.16b
mov v23.16b, v24.16b
b 8b
9: // End of one vertical slice.
subs w3, w3, #8
b.le 0f
// Move pointers back up to the top and loop horizontally.
msub x0, x1, x8, x0
msub x2, x7, x11, x2
add x0, x0, #8
add x2, x2, #16
mov w4, w8
b 1b
0:
ret
.purgem filter
endfunc
// void dav1d_copy_narrow_neon(pixel *dst, ptrdiff_t stride,
// const pixel *src, int w, int h);
function copy_narrow_neon, export=1
adr x5, L(copy_narrow_tbl)
ldrh w6, [x5, w3, uxtw #1]
sub x5, x5, w6, uxth
br x5
10:
add x7, x0, x1
lsl x1, x1, #1
18:
subs w4, w4, #8
b.lt 110f
ld1 {v0.8b}, [x2], #8
st1 {v0.b}[0], [x0], x1
st1 {v0.b}[1], [x7], x1
st1 {v0.b}[2], [x0], x1
st1 {v0.b}[3], [x7], x1
st1 {v0.b}[4], [x0], x1
st1 {v0.b}[5], [x7], x1
st1 {v0.b}[6], [x0], x1
st1 {v0.b}[7], [x7], x1
b.le 0f
b 18b
110:
add w4, w4, #8
asr x1, x1, #1
11:
subs w4, w4, #1
ld1 {v0.b}[0], [x2], #1
st1 {v0.b}[0], [x0], x1
b.gt 11b
0:
ret
20:
add x7, x0, x1
lsl x1, x1, #1
24:
subs w4, w4, #4
b.lt 210f
ld1 {v0.4h}, [x2], #8
st1 {v0.h}[0], [x0], x1
st1 {v0.h}[1], [x7], x1
st1 {v0.h}[2], [x0], x1
st1 {v0.h}[3], [x7], x1
b.le 0f
b 24b
210:
add w4, w4, #4
asr x1, x1, #1
22:
subs w4, w4, #1
ld1 {v0.h}[0], [x2], #2
st1 {v0.h}[0], [x0], x1
b.gt 22b
0:
ret
30:
ldrh w5, [x2]
ldrb w6, [x2, #2]
add x2, x2, #3
subs w4, w4, #1
strh w5, [x0]
strb w6, [x0, #2]
add x0, x0, x1
b.gt 30b
ret
40:
add x7, x0, x1
lsl x1, x1, #1
42:
subs w4, w4, #2
b.lt 41f
ld1 {v0.2s}, [x2], #8
st1 {v0.s}[0], [x0], x1
st1 {v0.s}[1], [x7], x1
b.le 0f
b 42b
41:
ld1 {v0.s}[0], [x2]
st1 {v0.s}[0], [x0]
0:
ret
50:
ldr w5, [x2]
ldrb w6, [x2, #4]
add x2, x2, #5
subs w4, w4, #1
str w5, [x0]
strb w6, [x0, #4]
add x0, x0, x1
b.gt 50b
ret
60:
ldr w5, [x2]
ldrh w6, [x2, #4]
add x2, x2, #6
subs w4, w4, #1
str w5, [x0]
strh w6, [x0, #4]
add x0, x0, x1
b.gt 60b
ret
70:
ldr w5, [x2]
ldrh w6, [x2, #4]
ldrb w7, [x2, #6]
add x2, x2, #7
subs w4, w4, #1
str w5, [x0]
strh w6, [x0, #4]
strb w7, [x0, #6]
add x0, x0, x1
b.gt 70b
ret
L(copy_narrow_tbl):
.hword 0
.hword L(copy_narrow_tbl) - 10b
.hword L(copy_narrow_tbl) - 20b
.hword L(copy_narrow_tbl) - 30b
.hword L(copy_narrow_tbl) - 40b
.hword L(copy_narrow_tbl) - 50b
.hword L(copy_narrow_tbl) - 60b
.hword L(copy_narrow_tbl) - 70b
endfunc