ref: d0e29420a6b872b5e5f2426066c99bcf877c5cbc
dir: /src/arm/64/cdef.S/
/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2019, 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"
.macro pad_top_bottom s1, s2, w, stride, rn, rw, ret
tst w6, #1 // CDEF_HAVE_LEFT
b.eq 2f
// CDEF_HAVE_LEFT
sub \s1, \s1, #2
sub \s2, \s2, #2
tst w6, #2 // CDEF_HAVE_RIGHT
b.eq 1f
// CDEF_HAVE_LEFT+CDEF_HAVE_RIGHT
ldr \rn\()0, [\s1]
ldr s1, [\s1, #\w]
ldr \rn\()2, [\s2]
ldr s3, [\s2, #\w]
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
uxtl v2.8h, v2.8b
uxtl v3.8h, v3.8b
str \rw\()0, [x0]
str d1, [x0, #2*\w]
add x0, x0, #2*\stride
str \rw\()2, [x0]
str d3, [x0, #2*\w]
.if \ret
ret
.else
add x0, x0, #2*\stride
b 3f
.endif
1:
// CDEF_HAVE_LEFT+!CDEF_HAVE_RIGHT
ldr \rn\()0, [\s1]
ldr h1, [\s1, #\w]
ldr \rn\()2, [\s2]
ldr h3, [\s2, #\w]
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
uxtl v2.8h, v2.8b
uxtl v3.8h, v3.8b
str \rw\()0, [x0]
str s1, [x0, #2*\w]
str s31, [x0, #2*\w+4]
add x0, x0, #2*\stride
str \rw\()2, [x0]
str s3, [x0, #2*\w]
str s31, [x0, #2*\w+4]
.if \ret
ret
.else
add x0, x0, #2*\stride
b 3f
.endif
2:
// !CDEF_HAVE_LEFT
tst w6, #2 // CDEF_HAVE_RIGHT
b.eq 1f
// !CDEF_HAVE_LEFT+CDEF_HAVE_RIGHT
ldr \rn\()0, [\s1]
ldr h1, [\s1, #\w]
ldr \rn\()2, [\s2]
ldr h3, [\s2, #\w]
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
uxtl v2.8h, v2.8b
uxtl v3.8h, v3.8b
str s31, [x0]
stur \rw\()0, [x0, #4]
str s1, [x0, #4+2*\w]
add x0, x0, #2*\stride
str s31, [x0]
stur \rw\()2, [x0, #4]
str s3, [x0, #4+2*\w]
.if \ret
ret
.else
add x0, x0, #2*\stride
b 3f
.endif
1:
// !CDEF_HAVE_LEFT+!CDEF_HAVE_RIGHT
ldr \rn\()0, [\s1]
ldr \rn\()1, [\s2]
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
str s31, [x0]
stur \rw\()0, [x0, #4]
str s31, [x0, #4+2*\w]
add x0, x0, #2*\stride
str s31, [x0]
stur \rw\()1, [x0, #4]
str s31, [x0, #4+2*\w]
.if \ret
ret
.else
add x0, x0, #2*\stride
.endif
3:
.endm
// void dav1d_cdef_paddingX_neon(uint16_t *tmp, const pixel *src,
// ptrdiff_t src_stride, const pixel (*left)[2],
// /*const*/ pixel *const top[2], int h,
// enum CdefEdgeFlags edges);
.macro padding_func w, stride, rn, rw
function cdef_padding\w\()_neon, export=1
movi v30.8h, #0x80, lsl #8
mov v31.16b, v30.16b
sub x0, x0, #2*(2*\stride+2)
tst w6, #4 // CDEF_HAVE_TOP
b.ne 1f
// !CDEF_HAVE_TOP
st1 {v30.8h, v31.8h}, [x0], #32
.if \w == 8
st1 {v30.8h, v31.8h}, [x0], #32
.endif
b 3f
1:
// CDEF_HAVE_TOP
ldr x8, [x4]
ldr x9, [x4, #8]
pad_top_bottom x8, x9, \w, \stride, \rn, \rw, 0
// Middle section
3:
tst w6, #1 // CDEF_HAVE_LEFT
b.eq 2f
// CDEF_HAVE_LEFT
tst w6, #2 // CDEF_HAVE_RIGHT
b.eq 1f
// CDEF_HAVE_LEFT+CDEF_HAVE_RIGHT
0:
ld1 {v0.h}[0], [x3], #2
ldr \rn\()1, [x1]
ldr h2, [x1, #\w]
add x1, x1, x2
subs w5, w5, #1
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
uxtl v2.8h, v2.8b
str s0, [x0]
stur \rw\()1, [x0, #4]
str s2, [x0, #4+2*\w]
add x0, x0, #2*\stride
b.gt 0b
b 3f
1:
// CDEF_HAVE_LEFT+!CDEF_HAVE_RIGHT
ld1 {v0.h}[0], [x3], #2
.if \w == 8
ld1 {v1.8b}, [x1], x2
.else
ld1 {v1.s}[0], [x1], x2
.endif
subs w5, w5, #1
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
str s0, [x0]
stur \rw\()1, [x0, #4]
str s31, [x0, #4+2*\w]
add x0, x0, #2*\stride
b.gt 1b
b 3f
2:
tst w6, #2 // CDEF_HAVE_RIGHT
b.eq 1f
// !CDEF_HAVE_LEFT+CDEF_HAVE_RIGHT
0:
ldr \rn\()0, [x1]
ldr h1, [x1, #\w]
add x1, x1, x2
subs w5, w5, #1
uxtl v0.8h, v0.8b
uxtl v1.8h, v1.8b
str s31, [x0]
stur \rw\()0, [x0, #4]
str s1, [x0, #4+2*\w]
add x0, x0, #2*\stride
b.gt 0b
b 3f
1:
// !CDEF_HAVE_LEFT+!CDEF_HAVE_RIGHT
.if \w == 8
ld1 {v0.8b}, [x1], x2
.else
ld1 {v0.s}[0], [x1], x2
.endif
subs w5, w5, #1
uxtl v0.8h, v0.8b
str s31, [x0]
stur \rw\()0, [x0, #4]
str s31, [x0, #4+2*\w]
add x0, x0, #2*\stride
b.gt 1b
3:
tst w6, #8 // CDEF_HAVE_BOTTOM
b.ne 1f
// !CDEF_HAVE_BOTTOM
st1 {v30.8h, v31.8h}, [x0], #32
.if \w == 8
st1 {v30.8h, v31.8h}, [x0], #32
.endif
ret
1:
// CDEF_HAVE_BOTTOM
add x9, x1, x2
pad_top_bottom x1, x9, \w, \stride, \rn, \rw, 1
endfunc
.endm
padding_func 8, 16, d, q
padding_func 4, 8, s, d
.macro dir_table w, stride
const directions\w
.byte -1 * \stride + 1, -2 * \stride + 2
.byte 0 * \stride + 1, -1 * \stride + 2
.byte 0 * \stride + 1, 0 * \stride + 2
.byte 0 * \stride + 1, 1 * \stride + 2
.byte 1 * \stride + 1, 2 * \stride + 2
.byte 1 * \stride + 0, 2 * \stride + 1
.byte 1 * \stride + 0, 2 * \stride + 0
.byte 1 * \stride + 0, 2 * \stride - 1
// Repeated, to avoid & 7
.byte -1 * \stride + 1, -2 * \stride + 2
.byte 0 * \stride + 1, -1 * \stride + 2
.byte 0 * \stride + 1, 0 * \stride + 2
.byte 0 * \stride + 1, 1 * \stride + 2
.byte 1 * \stride + 1, 2 * \stride + 2
.byte 1 * \stride + 0, 2 * \stride + 1
endconst
.endm
dir_table 8, 16
dir_table 4, 8
const pri_taps
.byte 4, 2, 3, 3
endconst
.macro load_px d1, d2, w
.if \w == 8
add x6, x2, w9, sxtb #1 // x + off
sub x9, x2, w9, sxtb #1 // x - off
ld1 {\d1\().8h}, [x6] // p0
ld1 {\d2\().8h}, [x9] // p1
.else
add x6, x2, w9, sxtb #1 // x + off
sub x9, x2, w9, sxtb #1 // x - off
ld1 {\d1\().4h}, [x6] // p0
add x6, x6, #2*8 // += stride
ld1 {\d2\().4h}, [x9] // p1
add x9, x9, #2*8 // += stride
ld1 {\d1\().d}[1], [x6] // p0
ld1 {\d2\().d}[1], [x9] // p1
.endif
.endm
.macro handle_pixel s1, s2, threshold, thresh_vec, shift, tap
umin v2.8h, v2.8h, \s1\().8h
smax v3.8h, v3.8h, \s1\().8h
umin v2.8h, v2.8h, \s2\().8h
smax v3.8h, v3.8h, \s2\().8h
cbz \threshold, 3f
uabd v16.8h, v0.8h, \s1\().8h // abs(diff)
uabd v20.8h, v0.8h, \s2\().8h // abs(diff)
ushl v17.8h, v16.8h, \shift // abs(diff) >> shift
ushl v21.8h, v20.8h, \shift // abs(diff) >> shift
uqsub v17.8h, \thresh_vec, v17.8h // imax(0, threshold - (abs(diff) >> shift))
uqsub v21.8h, \thresh_vec, v21.8h // imax(0, threshold - (abs(diff) >> shift))
cmhi v18.8h, v0.8h, \s1\().8h // px > p0
cmhi v22.8h, v0.8h, \s2\().8h // px > p1
umin v17.8h, v17.8h, v16.8h // imin(abs(diff), imax())
umin v21.8h, v21.8h, v20.8h // imin(abs(diff), imax())
dup v19.8h, \tap // taps[k]
neg v16.8h, v17.8h // -imin()
neg v20.8h, v21.8h // -imin()
bsl v18.16b, v16.16b, v17.16b // constrain() = apply_sign()
bsl v22.16b, v20.16b, v21.16b // constrain() = apply_sign()
mla v1.8h, v18.8h, v19.8h // sum += taps[k] * constrain()
mla v1.8h, v22.8h, v19.8h // sum += taps[k] * constrain()
3:
.endm
// void dav1d_cdef_filterX_neon(pixel *dst, ptrdiff_t dst_stride,
// const uint16_t *tmp, int pri_strength,
// int sec_strength, int dir, int damping, int h);
.macro filter w
function cdef_filter\w\()_neon, export=1
movrel x8, pri_taps
and w9, w3, #1
add x8, x8, w9, uxtw #1
movrel x9, directions\w
add x5, x9, w5, uxtw #1
movi v30.8h, #15
dup v28.8h, w6 // damping
dup v25.8h, w3 // threshold
dup v27.8h, w4 // threshold
clz v24.8h, v25.8h // clz(threshold)
clz v26.8h, v27.8h // clz(threshold)
sub v24.8h, v30.8h, v24.8h // ulog2(threshold)
sub v26.8h, v30.8h, v26.8h // ulog2(threshold)
uqsub v24.8h, v28.8h, v24.8h // shift = imax(0, damping - ulog2(threshold))
uqsub v26.8h, v28.8h, v26.8h // shift = imax(0, damping - ulog2(threshold))
neg v24.8h, v24.8h // -shift
neg v26.8h, v26.8h // -shift
1:
.if \w == 8
ld1 {v0.8h}, [x2] // px
.else
add x12, x2, #2*8
ld1 {v0.4h}, [x2] // px
ld1 {v0.d}[1], [x12] // px
.endif
movi v1.8h, #0 // sum
mov v2.16b, v0.16b // min
mov v3.16b, v0.16b // max
// Instead of loading sec_taps 2, 1 from memory, just set it
// to 2 initially and decrease for the second round.
mov w11, #2 // sec_taps[0]
2:
ldrb w9, [x5] // off1
load_px v4, v5, \w
add x5, x5, #4 // +2*2
ldrb w9, [x5] // off2
load_px v6, v7, \w
ldrb w10, [x8] // *pri_taps
handle_pixel v4, v5, w3, v25.8h, v24.8h, w10
add x5, x5, #8 // +2*4
ldrb w9, [x5] // off3
load_px v4, v5, \w
handle_pixel v6, v7, w4, v27.8h, v26.8h, w11
handle_pixel v4, v5, w4, v27.8h, v26.8h, w11
sub x5, x5, #11 // x8 -= 2*(2+4); x8 += 1;
subs w11, w11, #1 // sec_tap-- (value)
add x8, x8, #1 // pri_taps++ (pointer)
b.ne 2b
sshr v4.8h, v1.8h, #15 // -(sum < 0)
add v1.8h, v1.8h, v4.8h // sum - (sum < 0)
srshr v1.8h, v1.8h, #4 // (8 + sum - (sum < 0)) >> 4
add v0.8h, v0.8h, v1.8h // px + (8 + sum ...) >> 4
smin v0.8h, v0.8h, v3.8h
smax v0.8h, v0.8h, v2.8h // iclip(px + .., min, max)
xtn v0.8b, v0.8h
.if \w == 8
add x2, x2, #2*16 // tmp += tmp_stride
subs w7, w7, #1 // h--
st1 {v0.8b}, [x0], x1
.else
st1 {v0.s}[0], [x0], x1
add x2, x2, #2*16 // tmp += 2*tmp_stride
subs w7, w7, #2 // h -= 2
st1 {v0.s}[1], [x0], x1
.endif
// Reset pri_taps/sec_taps back to the original point
sub x5, x5, #2
sub x8, x8, #2
b.gt 1b
ret
endfunc
.endm
filter 8
filter 4
const div_table
.short 840, 420, 280, 210, 168, 140, 120, 105
endconst
const alt_fact
.short 420, 210, 140, 105, 105, 105, 105, 105, 140, 210, 420, 0
endconst
// int dav1d_cdef_find_dir_neon(const pixel *img, const ptrdiff_t stride,
// unsigned *const var)
function cdef_find_dir_neon, export=1
sub sp, sp, #32 // cost
mov w3, #8
movi v31.16b, #128
movi v30.16b, #0
movi v1.8h, #0 // v0-v1 sum_diag[0]
movi v3.8h, #0 // v2-v3 sum_diag[1]
movi v5.8h, #0 // v4-v5 sum_hv[0-1]
movi v7.8h, #0 // v6-v7 sum_alt[0]
movi v17.8h, #0 // v16-v17 sum_alt[1]
movi v18.8h, #0 // v18-v19 sum_alt[2]
movi v19.8h, #0
movi v21.8h, #0 // v20-v21 sum_alt[3]
.irpc i, 01234567
ld1 {v26.8b}, [x0], x1
usubl v26.8h, v26.8b, v31.8b
addv h25, v26.8h // [y]
rev64 v27.8h, v26.8h
addp v28.8h, v26.8h, v30.8h // [(x >> 1)]
add v5.8h, v5.8h, v26.8h // sum_hv[1]
ext v27.16b, v27.16b, v27.16b, #8 // [-x]
rev64 v29.4h, v28.4h // [-(x >> 1)]
ins v4.h[\i], v25.h[0] // sum_hv[0]
.if \i == 0
mov v0.16b, v26.16b // sum_diag[0]
mov v2.16b, v27.16b // sum_diag[1]
mov v6.16b, v28.16b // sum_alt[0]
mov v16.16b, v29.16b // sum_alt[1]
.else
ext v22.16b, v30.16b, v26.16b, #(16-2*\i)
ext v23.16b, v26.16b, v30.16b, #(16-2*\i)
ext v24.16b, v30.16b, v27.16b, #(16-2*\i)
ext v25.16b, v27.16b, v30.16b, #(16-2*\i)
add v0.8h, v0.8h, v22.8h // sum_diag[0]
add v1.8h, v1.8h, v23.8h // sum_diag[0]
add v2.8h, v2.8h, v24.8h // sum_diag[1]
add v3.8h, v3.8h, v25.8h // sum_diag[1]
ext v22.16b, v30.16b, v28.16b, #(16-2*\i)
ext v23.16b, v28.16b, v30.16b, #(16-2*\i)
ext v24.16b, v30.16b, v29.16b, #(16-2*\i)
ext v25.16b, v29.16b, v30.16b, #(16-2*\i)
add v6.8h, v6.8h, v22.8h // sum_alt[0]
add v7.8h, v7.8h, v23.8h // sum_alt[0]
add v16.8h, v16.8h, v24.8h // sum_alt[1]
add v17.8h, v17.8h, v25.8h // sum_alt[1]
.endif
.if \i < 6
ext v22.16b, v30.16b, v26.16b, #(16-2*(3-(\i/2)))
ext v23.16b, v26.16b, v30.16b, #(16-2*(3-(\i/2)))
add v18.8h, v18.8h, v22.8h // sum_alt[2]
add v19.8h, v19.8h, v23.8h // sum_alt[2]
.else
add v18.8h, v18.8h, v26.8h // sum_alt[2]
.endif
.if \i == 0
mov v20.16b, v26.16b // sum_alt[3]
.elseif \i == 1
add v20.8h, v20.8h, v26.8h // sum_alt[3]
.else
ext v24.16b, v30.16b, v26.16b, #(16-2*(\i/2))
ext v25.16b, v26.16b, v30.16b, #(16-2*(\i/2))
add v20.8h, v20.8h, v24.8h // sum_alt[3]
add v21.8h, v21.8h, v25.8h // sum_alt[3]
.endif
.endr
movi v31.4s, #105
smull v26.4s, v4.4h, v4.4h // sum_hv[0]*sum_hv[0]
smlal2 v26.4s, v4.8h, v4.8h
smull v27.4s, v5.4h, v5.4h // sum_hv[1]*sum_hv[1]
smlal2 v27.4s, v5.8h, v5.8h
mul v26.4s, v26.4s, v31.4s // cost[2] *= 105
mul v27.4s, v27.4s, v31.4s // cost[6] *= 105
addv s4, v26.4s // cost[2]
addv s5, v27.4s // cost[6]
rev64 v1.8h, v1.8h
rev64 v3.8h, v3.8h
ext v1.16b, v1.16b, v1.16b, #8 // sum_diag[0][15-n]
ext v3.16b, v3.16b, v3.16b, #8 // sum_diag[1][15-n]
ext v1.16b, v1.16b, v1.16b, #2 // sum_diag[0][14-n]
ext v3.16b, v3.16b, v3.16b, #2 // sum_diag[1][14-n]
str s4, [sp, #2*4] // cost[2]
str s5, [sp, #6*4] // cost[6]
movrel x4, div_table
ld1 {v31.8h}, [x4]
smull v22.4s, v0.4h, v0.4h // sum_diag[0]*sum_diag[0]
smull2 v23.4s, v0.8h, v0.8h
smlal v22.4s, v1.4h, v1.4h
smlal2 v23.4s, v1.8h, v1.8h
smull v24.4s, v2.4h, v2.4h // sum_diag[1]*sum_diag[1]
smull2 v25.4s, v2.8h, v2.8h
smlal v24.4s, v3.4h, v3.4h
smlal2 v25.4s, v3.8h, v3.8h
uxtl v30.4s, v31.4h // div_table
uxtl2 v31.4s, v31.8h
mul v22.4s, v22.4s, v30.4s // cost[0]
mla v22.4s, v23.4s, v31.4s // cost[0]
mul v24.4s, v24.4s, v30.4s // cost[4]
mla v24.4s, v25.4s, v31.4s // cost[4]
addv s0, v22.4s // cost[0]
addv s2, v24.4s // cost[4]
movrel x5, alt_fact
ld1 {v29.4h, v30.4h, v31.4h}, [x5]// div_table[2*m+1] + 105
str s0, [sp, #0*4] // cost[0]
str s2, [sp, #4*4] // cost[4]
uxtl v29.4s, v29.4h // div_table[2*m+1] + 105
uxtl v30.4s, v30.4h
uxtl v31.4s, v31.4h
.macro cost_alt d1, d2, s1, s2, s3, s4
smull v22.4s, \s1\().4h, \s1\().4h // sum_alt[n]*sum_alt[n]
smull2 v23.4s, \s1\().8h, \s1\().8h
smull v24.4s, \s2\().4h, \s2\().4h
smull v25.4s, \s3\().4h, \s3\().4h // sum_alt[n]*sum_alt[n]
smull2 v26.4s, \s3\().8h, \s3\().8h
smull v27.4s, \s4\().4h, \s4\().4h
mul v22.4s, v22.4s, v29.4s // sum_alt[n]^2*fact
mla v22.4s, v23.4s, v30.4s
mla v22.4s, v24.4s, v31.4s
mul v25.4s, v25.4s, v29.4s // sum_alt[n]^2*fact
mla v25.4s, v26.4s, v30.4s
mla v25.4s, v27.4s, v31.4s
addv \d1, v22.4s // *cost_ptr
addv \d2, v25.4s // *cost_ptr
.endm
cost_alt s6, s16, v6, v7, v16, v17 // cost[1], cost[3]
str s6, [sp, #1*4] // cost[1]
str s16, [sp, #3*4] // cost[3]
cost_alt s18, s20, v18, v19, v20, v21 // cost[5], cost[7]
str s18, [sp, #5*4] // cost[5]
str s20, [sp, #7*4] // cost[7]
mov w0, #0 // best_dir
mov w1, v0.s[0] // best_cost
mov w3, #1 // n
mov w4, v6.s[0]
.macro find_best s1, s2, s3
.ifnb \s2
mov w5, \s2\().s[0]
.endif
cmp w4, w1 // cost[n] > best_cost
csel w0, w3, w0, gt // best_dir = n
csel w1, w4, w1, gt // best_cost = cost[n]
.ifnb \s2
add w3, w3, #1 // n++
cmp w5, w1 // cost[n] > best_cost
mov w4, \s3\().s[0]
csel w0, w3, w0, gt // best_dir = n
csel w1, w5, w1, gt // best_cost = cost[n]
add w3, w3, #1 // n++
.endif
.endm
find_best v6, v4, v16
find_best v16, v2, v18
find_best v18, v5, v20
find_best v20
eor w3, w0, #4 // best_dir ^4
ldr w4, [sp, w3, uxtw #2]
sub w1, w1, w4 // best_cost - cost[best_dir ^ 4]
lsr w1, w1, #10
str w1, [x2] // *var
add sp, sp, #32
ret
endfunc