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sw_scale: Add specializations for hscale 16 to 19

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Provide arm64 neon optimized implementations for hscale16To19 with
filter sizes 4, 8 and X4.

The tests and benchmarks run on AWS Graviton 2 instances.
The results from a checkasm tool are shown below.

hscale_16_to_19__fs_4_dstW_512_c: 6216.0
hscale_16_to_19__fs_4_dstW_512_neon: 2257.0
hscale_16_to_19__fs_8_dstW_512_c: 10417.7
hscale_16_to_19__fs_8_dstW_512_neon: 3112.5
hscale_16_to_19__fs_12_dstW_512_c: 14890.5
hscale_16_to_19__fs_12_dstW_512_neon: 3899.0
hscale_16_to_19__fs_16_dstW_512_c: 19006.5
hscale_16_to_19__fs_16_dstW_512_neon: 5341.2
hscale_16_to_19__fs_32_dstW_512_c: 36629.5
hscale_16_to_19__fs_32_dstW_512_neon: 9502.7
hscale_16_to_19__fs_40_dstW_512_c: 45477.5
hscale_16_to_19__fs_40_dstW_512_neon: 11552.0

(Note, the checkasm tests for these functions haven't been
merged since they fail on x86.)

Signed-off-by: Hubert Mazur <hum@semihalf.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
pull/388/head
Hubert Mazur 2 years ago committed by Martin Storsjö
parent 9ccf8c5bfc
commit 2537fdc510
2 changed files with 468 additions and 0 deletions
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  1. 402
      libswscale/aarch64/hscale.S
  2. 66
      libswscale/aarch64/swscale.c

402
libswscale/aarch64/hscale.S
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@ -1045,3 +1045,405 @@ function ff_hscale16to15_X4_neon_asm, export=1
ret ret
endfunc endfunc
function ff_hscale16to19_4_neon_asm, export=1
// w0 int shift
// x1 int32_t *dst
// w2 int dstW
// x3 const uint8_t *src // treat it as uint16_t *src
// x4 const uint16_t *filter
// x5 const int32_t *filterPos
// w6 int filterSize
movi v18.4s, #1
movi v17.4s, #1
shl v18.4s, v18.4s, #19
sub v18.4s, v18.4s, v17.4s // max allowed value
dup v17.4s, w0 // read shift
neg v17.4s, v17.4s // negate it, so it can be used in sshl (effectively shift right)
cmp w2, #16
b.lt 2f // move to last block
ldp w8, w9, [x5] // filterPos[0], filterPos[1]
ldp w10, w11, [x5, #8] // filterPos[2], filterPos[3]
ldp w12, w13, [x5, #16] // filterPos[4], filterPos[5]
ldp w14, w15, [x5, #24] // filterPos[6], filterPos[7]
add x5, x5, #32
// shift all filterPos left by one, as uint16_t will be read
lsl x8, x8, #1
lsl x9, x9, #1
lsl x10, x10, #1
lsl x11, x11, #1
lsl x12, x12, #1
lsl x13, x13, #1
lsl x14, x14, #1
lsl x15, x15, #1
// load src with given offset
ldr x8, [x3, w8, UXTW]
ldr x9, [x3, w9, UXTW]
ldr x10, [x3, w10, UXTW]
ldr x11, [x3, w11, UXTW]
ldr x12, [x3, w12, UXTW]
ldr x13, [x3, w13, UXTW]
ldr x14, [x3, w14, UXTW]
ldr x15, [x3, w15, UXTW]
sub sp, sp, #64
// push src on stack so it can be loaded into vectors later
stp x8, x9, [sp]
stp x10, x11, [sp, #16]
stp x12, x13, [sp, #32]
stp x14, x15, [sp, #48]
1:
ld4 {v0.8h, v1.8h, v2.8h, v3.8h}, [sp]
ld4 {v28.8h, v29.8h, v30.8h, v31.8h}, [x4], #64 // filter[0..7]
// Each of blocks does the following:
// Extend src and filter to 32 bits with uxtl and sxtl
// multiply or multiply and accumulate results
// Extending to 32 bits is necessary, as unit16_t values can't
// be represented as int16_t without type promotion.
uxtl v26.4s, v0.4h
sxtl v27.4s, v28.4H
uxtl2 v0.4s, v0.8h
mul v5.4s, v26.4s, v27.4s
sxtl2 v28.4s, v28.8H
uxtl v26.4s, v1.4h
mul v6.4s, v0.4s, v28.4s
sxtl v27.4s, v29.4H
uxtl2 v0.4s, v1.8h
mla v5.4s, v27.4s, v26.4s
sxtl2 v28.4s, v29.8H
uxtl v26.4s, v2.4h
mla v6.4s, v28.4s, v0.4s
sxtl v27.4s, v30.4H
uxtl2 v0.4s, v2.8h
mla v5.4s, v27.4s, v26.4s
sxtl2 v28.4s, v30.8H
uxtl v26.4s, v3.4h
mla v6.4s, v28.4s, v0.4s
sxtl v27.4s, v31.4H
uxtl2 v0.4s, v3.8h
mla v5.4s, v27.4s, v26.4s
sxtl2 v28.4s, v31.8H
sub w2, w2, #8
mla v6.4s, v28.4s, v0.4s
sshl v5.4s, v5.4s, v17.4s
sshl v6.4s, v6.4s, v17.4s
smin v5.4s, v5.4s, v18.4s
smin v6.4s, v6.4s, v18.4s
st1 {v5.4s, v6.4s}, [x1], #32
cmp w2, #16
// load filterPositions into registers for next iteration
ldp w8, w9, [x5] // filterPos[0], filterPos[1]
ldp w10, w11, [x5, #8] // filterPos[2], filterPos[3]
ldp w12, w13, [x5, #16] // filterPos[4], filterPos[5]
ldp w14, w15, [x5, #24] // filterPos[6], filterPos[7]
add x5, x5, #32
lsl x8, x8, #1
lsl x9, x9, #1
lsl x10, x10, #1
lsl x11, x11, #1
lsl x12, x12, #1
lsl x13, x13, #1
lsl x14, x14, #1
lsl x15, x15, #1
ldr x8, [x3, w8, UXTW]
ldr x9, [x3, w9, UXTW]
ldr x10, [x3, w10, UXTW]
ldr x11, [x3, w11, UXTW]
ldr x12, [x3, w12, UXTW]
ldr x13, [x3, w13, UXTW]
ldr x14, [x3, w14, UXTW]
ldr x15, [x3, w15, UXTW]
stp x8, x9, [sp]
stp x10, x11, [sp, #16]
stp x12, x13, [sp, #32]
stp x14, x15, [sp, #48]
b.ge 1b
// here we make last iteration, without updating the registers
ld4 {v0.8h, v1.8h, v2.8h, v3.8h}, [sp]
ld4 {v28.8h, v29.8h, v30.8h, v31.8h}, [x4], #64
uxtl v26.4s, v0.4h
sxtl v27.4s, v28.4H
uxtl2 v0.4s, v0.8h
mul v5.4s, v26.4s, v27.4s
sxtl2 v28.4s, v28.8H
uxtl v26.4s, v1.4h
mul v6.4s, v0.4s, v28.4s
sxtl v27.4s, v29.4H
uxtl2 v0.4s, v1.8h
mla v5.4s, v26.4s, v27.4s
sxtl2 v28.4s, v29.8H
uxtl v26.4s, v2.4h
mla v6.4s, v0.4s, v28.4s
sxtl v27.4s, v30.4H
uxtl2 v0.4s, v2.8h
mla v5.4s, v26.4s, v27.4s
sxtl2 v28.4s, v30.8H
uxtl v26.4s, v3.4h
mla v6.4s, v0.4s, v28.4s
sxtl v27.4s, v31.4H
uxtl2 v0.4s, v3.8h
mla v5.4s, v26.4s, v27.4s
sxtl2 v28.4s, v31.8H
subs w2, w2, #8
mla v6.4s, v0.4s, v28.4s
sshl v5.4s, v5.4s, v17.4s
sshl v6.4s, v6.4s, v17.4s
smin v5.4s, v5.4s, v18.4s
smin v6.4s, v6.4s, v18.4s
st1 {v5.4s, v6.4s}, [x1], #32
add sp, sp, #64 // restore stack
cbnz w2, 2f
ret
2:
ldr w8, [x5], #4 // load filterPos
lsl w8, w8, #1
add x9, x3, w8, UXTW // src + filterPos
ld1 {v0.4h}, [x9] // load 4 * uint16_t
ld1 {v31.4h}, [x4], #8
uxtl v0.4s, v0.4h
sxtl v31.4s, v31.4h
subs w2, w2, #1
mul v5.4s, v0.4s, v31.4s
addv s0, v5.4S
sshl v0.4s, v0.4s, v17.4s
smin v0.4s, v0.4s, v18.4s
st1 {v0.s}[0], [x1], #4
cbnz w2, 2b // if iterations remain jump to beginning
ret
endfunc
function ff_hscale16to19_X8_neon_asm, export=1
// w0 int shift
// x1 int32_t *dst
// w2 int dstW
// x3 const uint8_t *src // treat it as uint16_t *src
// x4 const uint16_t *filter
// x5 const int32_t *filterPos
// w6 int filterSize
movi v20.4s, #1
movi v21.4s, #1
shl v20.4s, v20.4s, #19
sub v20.4s, v20.4s, v21.4s
dup v21.4s, w0
neg v21.4s, v21.4s
sbfiz x7, x6, #1, #32 // filterSize*2 (*2 because int16)
1: ldr w8, [x5], #4 // filterPos[idx]
ldr w10, [x5], #4 // filterPos[idx + 1]
lsl w8, w8, #1
ldr w11, [x5], #4 // filterPos[idx + 2]
ldr w9, [x5], #4 // filterPos[idx + 3]
mov x16, x4 // filter0 = filter
lsl w11, w11, #1
add x12, x16, x7 // filter1 = filter0 + filterSize*2
lsl w9, w9, #1
add x13, x12, x7 // filter2 = filter1 + filterSize*2
lsl w10, w10, #1
add x4, x13, x7 // filter3 = filter2 + filterSize*2
movi v0.2D, #0 // val sum part 1 (for dst[0])
movi v1.2D, #0 // val sum part 2 (for dst[1])
movi v2.2D, #0 // val sum part 3 (for dst[2])
movi v3.2D, #0 // val sum part 4 (for dst[3])
add x17, x3, w8, UXTW // srcp + filterPos[0]
add x8, x3, w10, UXTW // srcp + filterPos[1]
add x10, x3, w11, UXTW // srcp + filterPos[2]
add x11, x3, w9, UXTW // srcp + filterPos[3]
mov w15, w6 // filterSize counter
2: ld1 {v4.8H}, [x17], #16 // srcp[filterPos[0] + {0..7}]
ld1 {v5.8H}, [x16], #16 // load 8x16-bit filter values, part 1
ld1 {v6.8H}, [x8], #16 // srcp[filterPos[1] + {0..7}]
ld1 {v7.8H}, [x12], #16 // load 8x16-bit at filter+filterSize
uxtl v24.4s, v4.4H // extend srcp lower half to 32 bits to preserve sign
sxtl v25.4s, v5.4H // extend filter lower half to 32 bits to match srcp size
uxtl2 v4.4s, v4.8h // extend srcp upper half to 32 bits
mla v0.4s, v24.4s, v25.4s // multiply accumulate lower half of v4 * v5
sxtl2 v5.4s, v5.8h // extend filter upper half to 32 bits
uxtl v26.4s, v6.4h // extend srcp lower half to 32 bits
mla v0.4S, v4.4s, v5.4s // multiply accumulate upper half of v4 * v5
sxtl v27.4s, v7.4H // exted filter lower half
uxtl2 v6.4s, v6.8H // extend srcp upper half
sxtl2 v7.4s, v7.8h // extend filter upper half
ld1 {v16.8H}, [x10], #16 // srcp[filterPos[2] + {0..7}]
mla v1.4S, v26.4s, v27.4s // v1 accumulates srcp[filterPos[1] + {0..3}] * filter[{0..3}]
ld1 {v17.8H}, [x13], #16 // load 8x16-bit at filter+2*filterSize
uxtl v22.4s, v16.4H // extend srcp lower half
sxtl v23.4s, v17.4H // extend filter lower half
uxtl2 v16.4s, v16.8H // extend srcp upper half
sxtl2 v17.4s, v17.8h // extend filter upper half
mla v2.4S, v22.4s, v23.4s // v2 accumulates srcp[filterPos[2] + {0..3}] * filter[{0..3}]
mla v2.4S, v16.4s, v17.4s // v2 accumulates srcp[filterPos[2] + {4..7}] * filter[{4..7}]
ld1 {v18.8H}, [x11], #16 // srcp[filterPos[3] + {0..7}]
mla v1.4S, v6.4s, v7.4s // v1 accumulates srcp[filterPos[1] + {4..7}] * filter[{4..7}]
ld1 {v19.8H}, [x4], #16 // load 8x16-bit at filter+3*filterSize
subs w15, w15, #8 // j -= 8: processed 8/filterSize
uxtl v28.4s, v18.4H // extend srcp lower half
sxtl v29.4s, v19.4H // extend filter lower half
uxtl2 v18.4s, v18.8H // extend srcp upper half
sxtl2 v19.4s, v19.8h // extend filter upper half
mla v3.4S, v28.4s, v29.4s // v3 accumulates srcp[filterPos[3] + {0..3}] * filter[{0..3}]
mla v3.4S, v18.4s, v19.4s // v3 accumulates srcp[filterPos[3] + {4..7}] * filter[{4..7}]
b.gt 2b // inner loop if filterSize not consumed completely
addp v0.4S, v0.4S, v1.4S // part01 horizontal pair adding
addp v2.4S, v2.4S, v3.4S // part23 horizontal pair adding
addp v0.4S, v0.4S, v2.4S // part0123 horizontal pair adding
subs w2, w2, #4 // dstW -= 4
sshl v0.4s, v0.4s, v21.4s // shift right (effectively rigth, as shift is negative); overflow expected
smin v0.4s, v0.4s, v20.4s // apply min (do not use sqshl)
st1 {v0.4s}, [x1], #16 // write to destination part0123
b.gt 1b // loop until end of line
ret
endfunc
function ff_hscale16to19_X4_neon_asm, export=1
// w0 int shift
// x1 int16_t *dst
// w2 int dstW
// x3 const uint8_t *src
// x4 const int16_t *filter
// x5 const int32_t *filterPos
// w6 int filterSize
stp d8, d9, [sp, #-0x20]!
stp d10, d11, [sp, #0x10]
movi v18.4s, #1
movi v17.4s, #1
shl v18.4s, v18.4s, #19
sub v21.4s, v18.4s, v17.4s // max allowed value
dup v17.4s, w0 // read shift
neg v20.4s, v17.4s // negate it, so it can be used in sshl (effectively shift right)
lsl w7, w6, #1
1:
ldp w8, w9, [x5]
ldp w10, w11, [x5, #8]
movi v16.2d, #0 // initialize accumulator for idx + 0
movi v17.2d, #0 // initialize accumulator for idx + 1
movi v18.2d, #0 // initialize accumulator for idx + 2
movi v19.2d, #0 // initialize accumulator for idx + 3
mov x12, x4 // filter + 0
add x13, x4, x7 // filter + 1
add x8, x3, x8, lsl #1 // srcp + filterPos 0
add x14, x13, x7 // filter + 2
add x9, x3, x9, lsl #1 // srcp + filterPos 1
add x15, x14, x7 // filter + 3
add x10, x3, x10, lsl #1 // srcp + filterPos 2
mov w0, w6 // save the filterSize to temporary variable
add x11, x3, x11, lsl #1 // srcp + filterPos 3
add x5, x5, #16 // advance filter position
mov x16, xzr // clear the register x16 used for offsetting the filter values
2:
ldr q4, [x8], #16 // load src values for idx 0
ldr q5, [x9], #16 // load src values for idx 1
uxtl v26.4s, v4.4h
uxtl2 v4.4s, v4.8h
ldr q31, [x12, x16] // load filter values for idx 0
ldr q6, [x10], #16 // load src values for idx 2
sxtl v22.4s, v31.4h
sxtl2 v31.4s, v31.8h
mla v16.4s, v26.4s, v22.4s // multiplication of lower half for idx 0
uxtl v25.4s, v5.4h
uxtl2 v5.4s, v5.8h
ldr q30, [x13, x16] // load filter values for idx 1
ldr q7, [x11], #16 // load src values for idx 3
mla v16.4s, v4.4s, v31.4s // multiplication of upper half for idx 0
uxtl v24.4s, v6.4h
sxtl v8.4s, v30.4h
sxtl2 v30.4s, v30.8h
mla v17.4s, v25.4s, v8.4s // multiplication of lower half for idx 1
ldr q29, [x14, x16] // load filter values for idx 2
uxtl2 v6.4s, v6.8h
sxtl v9.4s, v29.4h
sxtl2 v29.4s, v29.8h
mla v17.4s, v5.4s, v30.4s // multiplication of upper half for idx 1
ldr q28, [x15, x16] // load filter values for idx 3
mla v18.4s, v24.4s, v9.4s // multiplication of lower half for idx 2
uxtl v23.4s, v7.4h
sxtl v10.4s, v28.4h
mla v18.4s, v6.4s, v29.4s // multiplication of upper half for idx 2
uxtl2 v7.4s, v7.8h
sxtl2 v28.4s, v28.8h
mla v19.4s, v23.4s, v10.4s // multiplication of lower half for idx 3
sub w0, w0, #8
cmp w0, #8
mla v19.4s, v7.4s, v28.4s // multiplication of upper half for idx 3
add x16, x16, #16 // advance filter values indexing
b.ge 2b
// 4 iterations left
sub x17, x7, #8 // step back to wrap up the filter pos for last 4 elements
ldr d4, [x8] // load src values for idx 0
ldr d31, [x12, x17] // load filter values for idx 0
uxtl v4.4s, v4.4h
sxtl v31.4s, v31.4h
ldr d5, [x9] // load src values for idx 1
mla v16.4s, v4.4s, v31.4s // multiplication of upper half for idx 0
ldr d30, [x13, x17] // load filter values for idx 1
uxtl v5.4s, v5.4h
sxtl v30.4s, v30.4h
ldr d6, [x10] // load src values for idx 2
mla v17.4s, v5.4s, v30.4s // multiplication of upper half for idx 1
ldr d29, [x14, x17] // load filter values for idx 2
uxtl v6.4s, v6.4h
sxtl v29.4s, v29.4h
ldr d7, [x11] // load src values for idx 3
ldr d28, [x15, x17] // load filter values for idx 3
mla v18.4s, v6.4s, v29.4s // multiplication of upper half for idx 2
uxtl v7.4s, v7.4h
sxtl v28.4s, v28.4h
addp v16.4s, v16.4s, v17.4s
mla v19.4s, v7.4s, v28.4s // multiplication of upper half for idx 3
subs w2, w2, #4
addp v18.4s, v18.4s, v19.4s
addp v16.4s, v16.4s, v18.4s
sshl v16.4s, v16.4s, v20.4s
smin v16.4s, v16.4s, v21.4s
st1 {v16.4s}, [x1], #16
add x4, x4, x7, lsl #2
b.gt 1b
ldp d8, d9, [sp]
ldp d10, d11, [sp, #0x10]
add sp, sp, #0x20
ret
endfunc

66
libswscale/aarch64/swscale.c
Unescape View File

@ -31,6 +31,15 @@ void ff_hscale16to15_X8_neon_asm(int shift, int16_t *_dst, int dstW,
void ff_hscale16to15_X4_neon_asm(int shift, int16_t *_dst, int dstW, void ff_hscale16to15_X4_neon_asm(int shift, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter, const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize); const int32_t *filterPos, int filterSize);
void ff_hscale16to19_4_neon_asm(int shift, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize);
void ff_hscale16to19_X8_neon_asm(int shift, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize);
void ff_hscale16to19_X4_neon_asm(int shift, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize);
static void ff_hscale16to15_4_neon(SwsContext *c, int16_t *_dst, int dstW, static void ff_hscale16to15_4_neon(SwsContext *c, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter, const uint8_t *_src, const int16_t *filter,
@ -79,6 +88,60 @@ static void ff_hscale16to15_X4_neon(SwsContext *c, int16_t *_dst, int dstW,
ff_hscale16to15_X4_neon_asm(sh, _dst, dstW, _src, filter, filterPos, filterSize); ff_hscale16to15_X4_neon_asm(sh, _dst, dstW, _src, filter, filterPos, filterSize);
} }
static void ff_hscale16to19_4_neon(SwsContext *c, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
int bits = desc->comp[0].depth - 1;
int sh = bits - 4;
if ((isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8) && desc->comp[0].depth<16) {
sh = 9;
} else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */
sh = 16 - 1 - 4;
}
ff_hscale16to19_4_neon_asm(sh, _dst, dstW, _src, filter, filterPos, filterSize);
}
static void ff_hscale16to19_X8_neon(SwsContext *c, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
int bits = desc->comp[0].depth - 1;
int sh = bits - 4;
if ((isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8) && desc->comp[0].depth<16) {
sh = 9;
} else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */
sh = 16 - 1 - 4;
}
ff_hscale16to19_X8_neon_asm(sh, _dst, dstW, _src, filter, filterPos, filterSize);
}
static void ff_hscale16to19_X4_neon(SwsContext *c, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
int bits = desc->comp[0].depth - 1;
int sh = bits - 4;
if ((isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8) && desc->comp[0].depth<16) {
sh = 9;
} else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */
sh = 16 - 1 - 4;
}
ff_hscale16to19_X4_neon_asm(sh, _dst, dstW, _src, filter, filterPos, filterSize);
}
#define SCALE_FUNC(filter_n, from_bpc, to_bpc, opt) \ #define SCALE_FUNC(filter_n, from_bpc, to_bpc, opt) \
void ff_hscale ## from_bpc ## to ## to_bpc ## _ ## filter_n ## _ ## opt( \ void ff_hscale ## from_bpc ## to ## to_bpc ## _ ## filter_n ## _ ## opt( \
SwsContext *c, int16_t *data, \ SwsContext *c, int16_t *data, \
@ -117,6 +180,9 @@ void ff_yuv2plane1_8_neon(
if (c->dstBpc <= 14) \ if (c->dstBpc <= 14) \
hscalefn = \ hscalefn = \
ff_hscale16to15_ ## filtersize ## _ ## opt; \ ff_hscale16to15_ ## filtersize ## _ ## opt; \
else \
hscalefn = \
ff_hscale16to19_ ## filtersize ## _ ## opt; \
} \ } \
} while (0) } while (0)

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