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FFmpeg/libavcodec/arm/hpeldsp_arm.S

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21 KiB
ArmAsm
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Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@
@ ARMv4 optimized DSP utils
@ Copyright (c) 2004 AGAWA Koji <i (AT) atty (DOT) jp>
@
@ 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 "config.h"
#include "libavutil/arm/asm.S"
#if !HAVE_ARMV5TE_EXTERNAL
#define pld @
#endif
.macro ALIGN_QWORD_D shift, Rd0, Rd1, Rd2, Rd3, Rn0, Rn1, Rn2, Rn3, Rn4
mov \Rd0, \Rn0, lsr #(\shift * 8)
mov \Rd1, \Rn1, lsr #(\shift * 8)
mov \Rd2, \Rn2, lsr #(\shift * 8)
mov \Rd3, \Rn3, lsr #(\shift * 8)
orr \Rd0, \Rd0, \Rn1, lsl #(32 - \shift * 8)
orr \Rd1, \Rd1, \Rn2, lsl #(32 - \shift * 8)
orr \Rd2, \Rd2, \Rn3, lsl #(32 - \shift * 8)
orr \Rd3, \Rd3, \Rn4, lsl #(32 - \shift * 8)
.endm
.macro ALIGN_DWORD shift, R0, R1, R2
mov \R0, \R0, lsr #(\shift * 8)
orr \R0, \R0, \R1, lsl #(32 - \shift * 8)
mov \R1, \R1, lsr #(\shift * 8)
orr \R1, \R1, \R2, lsl #(32 - \shift * 8)
.endm
.macro ALIGN_DWORD_D shift, Rdst0, Rdst1, Rsrc0, Rsrc1, Rsrc2
mov \Rdst0, \Rsrc0, lsr #(\shift * 8)
mov \Rdst1, \Rsrc1, lsr #(\shift * 8)
orr \Rdst0, \Rdst0, \Rsrc1, lsl #(32 - (\shift * 8))
orr \Rdst1, \Rdst1, \Rsrc2, lsl #(32 - (\shift * 8))
.endm
.macro RND_AVG32 Rd0, Rd1, Rn0, Rn1, Rm0, Rm1, Rmask
@ Rd = (Rn | Rm) - (((Rn ^ Rm) & ~0x01010101) >> 1)
@ Rmask = 0xFEFEFEFE
@ Rn = destroy
eor \Rd0, \Rn0, \Rm0
eor \Rd1, \Rn1, \Rm1
orr \Rn0, \Rn0, \Rm0
orr \Rn1, \Rn1, \Rm1
and \Rd0, \Rd0, \Rmask
and \Rd1, \Rd1, \Rmask
sub \Rd0, \Rn0, \Rd0, lsr #1
sub \Rd1, \Rn1, \Rd1, lsr #1
.endm
.macro NO_RND_AVG32 Rd0, Rd1, Rn0, Rn1, Rm0, Rm1, Rmask
@ Rd = (Rn & Rm) - (((Rn ^ Rm) & ~0x01010101) >> 1)
@ Rmask = 0xFEFEFEFE
@ Rn = destroy
eor \Rd0, \Rn0, \Rm0
eor \Rd1, \Rn1, \Rm1
and \Rn0, \Rn0, \Rm0
and \Rn1, \Rn1, \Rm1
and \Rd0, \Rd0, \Rmask
and \Rd1, \Rd1, \Rmask
add \Rd0, \Rn0, \Rd0, lsr #1
add \Rd1, \Rn1, \Rd1, lsr #1
.endm
.macro JMP_ALIGN tmp, reg
ands \tmp, \reg, #3
bic \reg, \reg, #3
beq 1f
subs \tmp, \tmp, #1
beq 2f
subs \tmp, \tmp, #1
beq 3f
b 4f
.endm
@ ----------------------------------------------------------------
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_pixels16_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r11, lr}
JMP_ALIGN r5, r1
1:
ldm r1, {r4-r7}
add r1, r1, r2
stm r0, {r4-r7}
pld [r1]
subs r3, r3, #1
add r0, r0, r2
bne 1b
pop {r4-r11, pc}
.align 5
2:
ldm r1, {r4-r8}
add r1, r1, r2
ALIGN_QWORD_D 1, r9, r10, r11, r12, r4, r5, r6, r7, r8
pld [r1]
subs r3, r3, #1
stm r0, {r9-r12}
add r0, r0, r2
bne 2b
pop {r4-r11, pc}
.align 5
3:
ldm r1, {r4-r8}
add r1, r1, r2
ALIGN_QWORD_D 2, r9, r10, r11, r12, r4, r5, r6, r7, r8
pld [r1]
subs r3, r3, #1
stm r0, {r9-r12}
add r0, r0, r2
bne 3b
pop {r4-r11, pc}
.align 5
4:
ldm r1, {r4-r8}
add r1, r1, r2
ALIGN_QWORD_D 3, r9, r10, r11, r12, r4, r5, r6, r7, r8
pld [r1]
subs r3, r3, #1
stm r0, {r9-r12}
add r0, r0, r2
bne 4b
pop {r4-r11,pc}
endfunc
@ ----------------------------------------------------------------
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_pixels8_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r5,lr}
JMP_ALIGN r5, r1
1:
ldm r1, {r4-r5}
add r1, r1, r2
subs r3, r3, #1
pld [r1]
stm r0, {r4-r5}
add r0, r0, r2
bne 1b
pop {r4-r5,pc}
.align 5
2:
ldm r1, {r4-r5, r12}
add r1, r1, r2
ALIGN_DWORD 1, r4, r5, r12
pld [r1]
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 2b
pop {r4-r5,pc}
.align 5
3:
ldm r1, {r4-r5, r12}
add r1, r1, r2
ALIGN_DWORD 2, r4, r5, r12
pld [r1]
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 3b
pop {r4-r5,pc}
.align 5
4:
ldm r1, {r4-r5, r12}
add r1, r1, r2
ALIGN_DWORD 3, r4, r5, r12
pld [r1]
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 4b
pop {r4-r5,pc}
endfunc
@ ----------------------------------------------------------------
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_pixels8_x2_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r10,lr}
ldr r12, =0xfefefefe
JMP_ALIGN r5, r1
1:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 1, r6, r7, r4, r5, r10
pld [r1]
RND_AVG32 r8, r9, r4, r5, r6, r7, r12
subs r3, r3, #1
stm r0, {r8-r9}
add r0, r0, r2
bne 1b
pop {r4-r10,pc}
.align 5
2:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 1, r6, r7, r4, r5, r10
ALIGN_DWORD_D 2, r8, r9, r4, r5, r10
pld [r1]
RND_AVG32 r4, r5, r6, r7, r8, r9, r12
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 2b
pop {r4-r10,pc}
.align 5
3:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 2, r6, r7, r4, r5, r10
ALIGN_DWORD_D 3, r8, r9, r4, r5, r10
pld [r1]
RND_AVG32 r4, r5, r6, r7, r8, r9, r12
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 3b
pop {r4-r10,pc}
.align 5
4:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 3, r6, r7, r4, r5, r10
pld [r1]
RND_AVG32 r8, r9, r6, r7, r5, r10, r12
subs r3, r3, #1
stm r0, {r8-r9}
add r0, r0, r2
bne 4b
pop {r4-r10,pc}
endfunc
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_no_rnd_pixels8_x2_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r10,lr}
ldr r12, =0xfefefefe
JMP_ALIGN r5, r1
1:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 1, r6, r7, r4, r5, r10
pld [r1]
NO_RND_AVG32 r8, r9, r4, r5, r6, r7, r12
subs r3, r3, #1
stm r0, {r8-r9}
add r0, r0, r2
bne 1b
pop {r4-r10,pc}
.align 5
2:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 1, r6, r7, r4, r5, r10
ALIGN_DWORD_D 2, r8, r9, r4, r5, r10
pld [r1]
NO_RND_AVG32 r4, r5, r6, r7, r8, r9, r12
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 2b
pop {r4-r10,pc}
.align 5
3:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 2, r6, r7, r4, r5, r10
ALIGN_DWORD_D 3, r8, r9, r4, r5, r10
pld [r1]
NO_RND_AVG32 r4, r5, r6, r7, r8, r9, r12
subs r3, r3, #1
stm r0, {r4-r5}
add r0, r0, r2
bne 3b
pop {r4-r10,pc}
.align 5
4:
ldm r1, {r4-r5, r10}
add r1, r1, r2
ALIGN_DWORD_D 3, r6, r7, r4, r5, r10
pld [r1]
NO_RND_AVG32 r8, r9, r6, r7, r5, r10, r12
subs r3, r3, #1
stm r0, {r8-r9}
add r0, r0, r2
bne 4b
pop {r4-r10,pc}
endfunc
@ ----------------------------------------------------------------
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_pixels8_y2_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r11,lr}
mov r3, r3, lsr #1
ldr r12, =0xfefefefe
JMP_ALIGN r5, r1
1:
ldm r1, {r4-r5}
add r1, r1, r2
6: ldm r1, {r6-r7}
add r1, r1, r2
pld [r1]
RND_AVG32 r8, r9, r4, r5, r6, r7, r12
ldm r1, {r4-r5}
add r1, r1, r2
stm r0, {r8-r9}
add r0, r0, r2
pld [r1]
RND_AVG32 r8, r9, r6, r7, r4, r5, r12
subs r3, r3, #1
stm r0, {r8-r9}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
.align 5
2:
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 1, r4, r5, r6
6: ldm r1, {r7-r9}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 1, r7, r8, r9
RND_AVG32 r10, r11, r4, r5, r7, r8, r12
stm r0, {r10-r11}
add r0, r0, r2
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 1, r4, r5, r6
subs r3, r3, #1
RND_AVG32 r10, r11, r7, r8, r4, r5, r12
stm r0, {r10-r11}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
.align 5
3:
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 2, r4, r5, r6
6: ldm r1, {r7-r9}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 2, r7, r8, r9
RND_AVG32 r10, r11, r4, r5, r7, r8, r12
stm r0, {r10-r11}
add r0, r0, r2
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 2, r4, r5, r6
subs r3, r3, #1
RND_AVG32 r10, r11, r7, r8, r4, r5, r12
stm r0, {r10-r11}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
.align 5
4:
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 3, r4, r5, r6
6: ldm r1, {r7-r9}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 3, r7, r8, r9
RND_AVG32 r10, r11, r4, r5, r7, r8, r12
stm r0, {r10-r11}
add r0, r0, r2
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 3, r4, r5, r6
subs r3, r3, #1
RND_AVG32 r10, r11, r7, r8, r4, r5, r12
stm r0, {r10-r11}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
endfunc
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_no_rnd_pixels8_y2_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r11,lr}
mov r3, r3, lsr #1
ldr r12, =0xfefefefe
JMP_ALIGN r5, r1
1:
ldm r1, {r4-r5}
add r1, r1, r2
6: ldm r1, {r6-r7}
add r1, r1, r2
pld [r1]
NO_RND_AVG32 r8, r9, r4, r5, r6, r7, r12
ldm r1, {r4-r5}
add r1, r1, r2
stm r0, {r8-r9}
add r0, r0, r2
pld [r1]
NO_RND_AVG32 r8, r9, r6, r7, r4, r5, r12
subs r3, r3, #1
stm r0, {r8-r9}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
.align 5
2:
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 1, r4, r5, r6
6: ldm r1, {r7-r9}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 1, r7, r8, r9
NO_RND_AVG32 r10, r11, r4, r5, r7, r8, r12
stm r0, {r10-r11}
add r0, r0, r2
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 1, r4, r5, r6
subs r3, r3, #1
NO_RND_AVG32 r10, r11, r7, r8, r4, r5, r12
stm r0, {r10-r11}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
.align 5
3:
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 2, r4, r5, r6
6: ldm r1, {r7-r9}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 2, r7, r8, r9
NO_RND_AVG32 r10, r11, r4, r5, r7, r8, r12
stm r0, {r10-r11}
add r0, r0, r2
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 2, r4, r5, r6
subs r3, r3, #1
NO_RND_AVG32 r10, r11, r7, r8, r4, r5, r12
stm r0, {r10-r11}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
.align 5
4:
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 3, r4, r5, r6
6: ldm r1, {r7-r9}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 3, r7, r8, r9
NO_RND_AVG32 r10, r11, r4, r5, r7, r8, r12
stm r0, {r10-r11}
add r0, r0, r2
ldm r1, {r4-r6}
add r1, r1, r2
pld [r1]
ALIGN_DWORD 3, r4, r5, r6
subs r3, r3, #1
NO_RND_AVG32 r10, r11, r7, r8, r4, r5, r12
stm r0, {r10-r11}
add r0, r0, r2
bne 6b
pop {r4-r11,pc}
endfunc
.ltorg
@ ----------------------------------------------------------------
.macro RND_XY2_IT align, rnd
@ l1= (a & 0x03030303) + (b & 0x03030303) ?(+ 0x02020202)
@ h1= ((a & 0xFCFCFCFCUL) >> 2) + ((b & 0xFCFCFCFCUL) >> 2)
.if \align == 0
ldm r1, {r6-r8}
.elseif \align == 3
ldm r1, {r5-r7}
.else
ldm r1, {r8-r10}
.endif
add r1, r1, r2
pld [r1]
.if \align == 0
ALIGN_DWORD_D 1, r4, r5, r6, r7, r8
.elseif \align == 1
ALIGN_DWORD_D 1, r4, r5, r8, r9, r10
ALIGN_DWORD_D 2, r6, r7, r8, r9, r10
.elseif \align == 2
ALIGN_DWORD_D 2, r4, r5, r8, r9, r10
ALIGN_DWORD_D 3, r6, r7, r8, r9, r10
.elseif \align == 3
ALIGN_DWORD_D 3, r4, r5, r5, r6, r7
.endif
ldr r14, =0x03030303
tst r3, #1
and r8, r4, r14
and r9, r5, r14
and r10, r6, r14
and r11, r7, r14
it eq
andeq r14, r14, r14, \rnd #1
add r8, r8, r10
add r9, r9, r11
ldr r12, =0xfcfcfcfc >> 2
itt eq
addeq r8, r8, r14
addeq r9, r9, r14
and r4, r12, r4, lsr #2
and r5, r12, r5, lsr #2
and r6, r12, r6, lsr #2
and r7, r12, r7, lsr #2
add r10, r4, r6
add r11, r5, r7
subs r3, r3, #1
.endm
.macro RND_XY2_EXPAND align, rnd
RND_XY2_IT \align, \rnd
6: push {r8-r11}
RND_XY2_IT \align, \rnd
pop {r4-r7}
add r4, r4, r8
add r5, r5, r9
ldr r14, =0x0f0f0f0f
add r6, r6, r10
add r7, r7, r11
and r4, r14, r4, lsr #2
and r5, r14, r5, lsr #2
add r4, r4, r6
add r5, r5, r7
stm r0, {r4-r5}
add r0, r0, r2
bge 6b
pop {r4-r11,pc}
.endm
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_pixels8_xy2_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r11,lr} @ R14 is also called LR
JMP_ALIGN r5, r1
1: RND_XY2_EXPAND 0, lsl
.align 5
2: RND_XY2_EXPAND 1, lsl
.align 5
3: RND_XY2_EXPAND 2, lsl
.align 5
4: RND_XY2_EXPAND 3, lsl
endfunc
arm: Allow overriding the alignment set in the function macro The function macro always sets .align 2 before declaring the function label (since 5c5e1ea3) and always sets the section to .text (since 278caa6a). The .align 5 before certain functions, added in fc252eba, were added before .text and .align were added to the function macro and thus became useless/unused when the function macro got them. This restores the original intention, to align the loop entry points. Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-07 13:13:11 +03:00
function ff_put_no_rnd_pixels8_xy2_arm, export=1, align=5
Move arm half-pel assembly from dsputil to hpeldsp.
2013-03-11 02:16:45 +03:00
@ void func(uint8_t *block, const uint8_t *pixels, int line_size, int h)
@ block = word aligned, pixles = unaligned
pld [r1]
push {r4-r11,lr}
JMP_ALIGN r5, r1
1: RND_XY2_EXPAND 0, lsr
.align 5
2: RND_XY2_EXPAND 1, lsr
.align 5
3: RND_XY2_EXPAND 2, lsr
.align 5
4: RND_XY2_EXPAND 3, lsr
endfunc
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