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android / platform / external / libaom / 562f1470ceed6c7d122e61dc5ca63300ab312830 / . / vpx_scale / symbian / gen_scalers_armv4.s
blob: 3dfd0b9b9e6558c3efe8223094476b278ab74963 [file] [log] [blame]
@ This file was created from a .asm file
@ using the ads2gas.pl script.
.equ WIDE_REFERENCE, 0
.ifndef ARCHITECTURE
.equ ARCHITECTURE, 5
.endif
.global horizontal_line_4_5_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type horizontal_line_4_5_scale_armv4, function
.endif
.global vertical_band_4_5_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type vertical_band_4_5_scale_armv4, function
.endif
.global horizontal_line_2_3_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type horizontal_line_2_3_scale_armv4, function
.endif
.global vertical_band_2_3_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type vertical_band_2_3_scale_armv4, function
.endif
.global horizontal_line_3_5_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type horizontal_line_3_5_scale_armv4, function
.endif
.global vertical_band_3_5_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type vertical_band_3_5_scale_armv4, function
.endif
.global horizontal_line_3_4_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type horizontal_line_3_4_scale_armv4, function
.endif
.global vertical_band_3_4_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type vertical_band_3_4_scale_armv4, function
.endif
.global horizontal_line_1_2_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type horizontal_line_1_2_scale_armv4, function
.endif
.global vertical_band_1_2_scale_armv4
.ifndef NO_TYPE_PSEUDO_OP
.type vertical_band_1_2_scale_armv4, function
.endif
.text
src .req r0
srcw .req r1
dest .req r2
mask .req r12
c51_205 .req r10
c102_154 .req r11
@/****************************************************************************
@ *
@ * ROUTINE : horizontal_line_4_5_scale_armv4
@ *
@ * INPUTS : const unsigned char *source : Pointer to source data.
@ * unsigned int source_width : Stride of source.
@ * unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_width : Stride of destination (NOT USED).
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Copies horizontal line of pixels from source to
@ * destination scaling up by 4 to 5.
@ *
@ * SPECIAL NOTES : None.
@ *
@ ****************************************************************************/
@void horizontal_line_4_5_scale_armv4
@(
@ r0 = UINT8 *source
@ r1 = UINT32 source_width
@ r2 = UINT8 *dest
@ r3 = UINT32 dest_width
@)
_HorizontalLine_4_5_Scale_ARMv4:
horizontal_line_4_5_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
mov mask, #255 @ mask for selection
ldr c51_205, =0x3300cd
ldr c102_154, =0x66009a
ldr r3, [src], #4
hl45_loop:
and r4, r3, mask @ a = src[0]
and r5, mask, r3, lsr #8 @ b = src[1]
strb r4, [dest], #1
orr r6, r4, r5, lsl #16 @ b | a
and r7, mask, r3, lsr #16 @ c = src[2]
mul r6, c51_205, r6 @ a * 51 + 205 * b
orr r5, r5, r7, lsl #16 @ c | b
mul r5, c102_154, r5 @ b * 102 + 154 * c
add r6, r6, #0x8000
and r8, mask, r3, lsr #24 @ d = src[3]
mov r6, r6, lsr #24
strb r6, [dest], #1
orr r7, r8, r7, lsl #16 @ c | d
mul r7, c102_154, r7 @ c * 154 + 102 * d
add r5, r5, #0x8000
ldr r3, [src], #4
mov r5, r5, lsr #24
strb r5, [dest], #1
add r7, r7, #0x8000
and r9, mask, r3 @ e = src[4]
orr r9, r9, r8, lsl #16 @ d | e
mul r9, c51_205, r9 @ d * 205 + 51 * e
mov r7, r7, lsr #24
strb r7, [dest], #1
add r9, r9, #0x8000
subs srcw, srcw, #4
mov r9, r9, lsr #24
strb r9, [dest], #1
bne hl45_loop
and r4, r3, mask
and r5, mask, r3, lsl #8
strb r4, [dest], #1
orr r6, r4, r5, lsl #16 @ b | a
mul r6, c51_205, r6
and r7, mask, r3, lsl #16
orr r5, r5, r7, lsl #16 @ c | b
mul r5, c102_154, r5
add r6, r6, #0x8000
and r8, mask, r3, lsl #24
mov r6, r6, lsr #24
strb r6, [dest], #1
orr r7, r8, r7, lsl #16 @ c | d
mul r7, c102_154, r7
add r5, r5, #0x8000
mov r5, r5, lsr #24
strb r5, [dest], #1
add r7, r7, #0x8000
mov r7, r7, lsr #24
strb r7, [dest], #1
ldrb r3, [src]
strb r3, [dest], #1
ldmia sp!, {r4 - r11, pc}
@ @|vp8cx_horizontal_line_4_5_scale_c|
@/****************************************************************************
@ *
@ * ROUTINE : vertical_band_4_5_scale_armv4
@ *
@ * INPUTS : unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_pitch : Stride of destination data.
@ * unsigned int dest_width : Width of destination data.
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Scales vertical band of pixels by scale 4 to 5. The
@ * height of the band scaled is 4-pixels.
@ *
@ * SPECIAL NOTES : The routine uses the first line of the band below
@ * the current band.
@ *
@ ****************************************************************************/
@void vertical_band_4_5_scale_armv4
@(
@ r0 = UINT8 *dest
@ r1 = UINT32 dest_pitch
@ r2 = UINT32 dest_width
@)
_VerticalBand_4_5_Scale_ARMv4:
vertical_band_4_5_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
ldr c51_205, =0x3300cd
ldr c102_154, =0x66009a
vl45_loop:
mov r3, src
ldrb r4, [r3], r1 @ a = des [0]
ldrb r5, [r3], r1 @ b = des [dest_pitch]
ldrb r7, [r3], r1 @ c = des[dest_pitch*2]
add lr, src, r1
orr r6, r4, r5, lsl #16 @ b | a
mul r6, c51_205, r6 @ a * 51 + 205 * b
ldrb r8, [r3], r1 @ d = des[dest_pitch*3]
orr r5, r5, r7, lsl #16 @ c | b
mul r5, c102_154, r5 @ b * 102 + 154 * c
add r6, r6, #0x8000
orr r7, r8, r7, lsl #16 @ c | d
mov r6, r6, lsr #24
strb r6, [lr], r1
ldrb r9, [r3, r1] @ e = des [dest_pitch * 5]
mul r7, c102_154, r7 @ c * 154 + 102 * d
add r5, r5, #0x8000
orr r9, r9, r8, lsl #16 @ d | e
mov r5, r5, lsr #24
strb r5, [lr], r1
mul r9, c51_205, r9 @ d * 205 + 51 * e
add r7, r7, #0x8000
add src, src, #1
mov r7, r7, lsr #24
strb r7, [lr], r1
add r9, r9, #0x8000
subs r2, r2, #1
mov r9, r9, lsr #24
strb r9, [lr], r1
bne vl45_loop
ldmia sp!, {r4 - r11, pc}
@ @|vertical_band_4_5_scale_armv4|
@/****************************************************************************
@ *
@ * ROUTINE : horizontal_line_2_3_scale_armv4
@ *
@ * INPUTS : const unsigned char *source : Pointer to source data.
@ * unsigned int source_width : Stride of source.
@ * unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_width : Stride of destination (NOT USED).
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Copies horizontal line of pixels from source to
@ * destination scaling up by 2 to 3.
@ *
@ * SPECIAL NOTES : None.
@ *
@ *
@ ****************************************************************************/
@void horizontal_line_2_3_scale_armv4
@(
@ const unsigned char *source,
@ unsigned int source_width,
@ unsigned char *dest,
@ unsigned int dest_width
@)
_HorizontalLine_2_3_Scale_ARMv4:
horizontal_line_2_3_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
ldr lr, =85
ldr r12, =171
hl23_loop:
ldrb r3, [src], #1 @ a
ldrb r4, [src], #1 @ b
ldrb r5, [src] @ c
strb r3, [dest], #1
mul r4, r12, r4 @ b * 171
mla r6, lr, r3, r4 @ a * 85
mla r7, lr, r5, r4 @ c * 85
add r6, r6, #128
mov r6, r6, lsr #8
strb r6, [dest], #1
add r7, r7, #128
mov r7, r7, lsr #8
strb r7, [dest], #1
subs srcw, srcw, #2
bne hl23_loop
ldrb r4, [src, #1] @ b
strb r5, [dest], #1
strb r4, [dest, #1]
mul r4, r12, r4 @ b * 171
mla r6, lr, r5, r4 @ a * 85 + b *171
add r6, r6, #128
mov r6, r6, lsr #8
strb r6, [dest]
ldmia sp!, {r4 - r11, pc}
@ @|horizontal_line_2_3_scale_armv4|
@/****************************************************************************
@ *
@ * ROUTINE : vertical_band_2_3_scale_armv4
@ *
@ * INPUTS : unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_pitch : Stride of destination data.
@ * unsigned int dest_width : Width of destination data.
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Scales vertical band of pixels by scale 2 to 3. The
@ * height of the band scaled is 2-pixels.
@ *
@ * SPECIAL NOTES : The routine uses the first line of the band below
@ * the current band.
@ *
@ ****************************************************************************/
@void vertical_band_2_3_scale_armv4
@(
@ r0 = UINT8 *dest
@ r1 = UINT32 dest_pitch
@ r2 = UINT32 dest_width
@)
_VerticalBand_2_3_Scale_ARMv4:
vertical_band_2_3_scale_armv4: @
stmdb sp!, {r4 - r8, lr}
ldr lr, =85
ldr r12, =171
add r3, r1, r1, lsl #1 @ 3 * dest_pitch
vl23_loop:
ldrb r4, [src] @ a = des [0]
ldrb r5, [src, r1] @ b = des [dest_pitch]
ldrb r7, [src, r3] @ c = des [dest_pitch*3]
subs r2, r2, #1
mul r5, r12, r5 @ b * 171
mla r6, lr, r4, r5 @ a * 85
mla r8, lr, r7, r5 @ c * 85
add r6, r6, #128
mov r6, r6, lsr #8
strb r6, [src, r1]
add r8, r8, #128
mov r8, r8, lsr #8
strb r8, [src, r1, lsl #1]
add src, src, #1
bne vl23_loop
ldmia sp!, {r4 - r8, pc}
@ @|vertical_band_2_3_scale_armv4|
@/****************************************************************************
@ *
@ * ROUTINE : vp8cx_horizontal_line_3_5_scale_c
@ *
@ * INPUTS : const unsigned char *source : Pointer to source data.
@ * unsigned int source_width : Stride of source.
@ * unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_width : Stride of destination (NOT USED).
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Copies horizontal line of pixels from source to
@ * destination scaling up by 3 to 5.
@ *
@ * SPECIAL NOTES : None.
@ *
@ *
@ ****************************************************************************/
@void vp8cx_horizontal_line_3_5_scale_c
@(
@ const unsigned char *source,
@ unsigned int source_width,
@ unsigned char *dest,
@ unsigned int dest_width
@)
_HorizontalLine_3_5_Scale_ARMv4:
horizontal_line_3_5_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
ldr c51_205, =0x3300cd
ldr c102_154, =0x66009a
ldrb r4, [src], #1 @ a = src[0]
hl35_loop:
ldrb r8, [src], #1 @ b = src[1]
strb r4, [dest], #1
orr r6, r4, r8, lsl #16 @ b | a
ldrb r9, [src], #1 @ c = src[2]
mul r6, c102_154, r6 @ a * 102 + 154 * b
orr r5, r9, r8, lsl #16 @ b | c
mul r5, c51_205, r5 @ b * 205 + 51 * c
add r6, r6, #0x8000
ldrb r4, [src], #1 @ d = src[3]
mov r6, r6, lsr #24
strb r6, [dest], #1
orr r7, r8, r9, lsl #16 @ c | b
mul r7, c51_205, r7 @ c * 205 + 154 * b
add r5, r5, #0x8000
mov r5, r5, lsr #24
strb r5, [dest], #1
orr r9, r4, r9, lsl #16 @ c | d
mul r9, c102_154, r9 @ c * 154 + 102 * d
add r7, r7, #0x8000
mov r7, r7, lsr #24
strb r7, [dest], #1
add r9, r9, #0x8000
subs srcw, srcw, #3
mov r9, r9, lsr #24
strb r9, [dest], #1
bpl hl35_loop
ldrb r5, [src], #1 @ b = src[1]
strb r4, [dest], #1
orr r6, r4, r8, lsl #16 @ b | a
ldrb r9, [src], #1 @ c = src[2]
mul r6, c102_154, r6 @ a * 102 + 154 * b
orr r5, r9, r8, lsl #16 @ b | c
mul r5, c51_205, r5 @ b * 205 + 51 * c
add r6, r6, #0x8000
mov r6, r6, lsr #24
strb r6, [dest], #1
orr r7, r8, r9, lsl #16 @ c | b
mul r7, c51_205, r7 @ c * 205 + 154 * b
add r5, r5, #0x8000
mov r5, r5, lsr #24
strb r5, [dest], #1
add r7, r7, #0x8000
mov r7, r7, lsr #24
strb r7, [dest], #1
strb r9, [dest], #1
ldmia sp!, {r4 - r11, pc}
@ @|vp8cx_horizontal_line_3_5_scale_c|
@/****************************************************************************
@ *
@ * ROUTINE : vp8cx_vertical_band_3_5_scale_c
@ *
@ * INPUTS : unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_pitch : Stride of destination data.
@ * unsigned int dest_width : Width of destination data.
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Scales vertical band of pixels by scale 3 to 5. The
@ * height of the band scaled is 3-pixels.
@ *
@ * SPECIAL NOTES : The routine uses the first line of the band below
@ * the current band.
@ *
@ ****************************************************************************/
@void vertical_band_4_5_scale_armv4
@(
@ r0 = UINT8 *dest
@ r1 = UINT32 dest_pitch
@ r2 = UINT32 dest_width
@)
_VerticalBand_3_5_Scale_ARMv4:
vertical_band_3_5_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
ldr c51_205, =0x3300cd
ldr c102_154, =0x66009a
vl35_loop:
mov r3, src
ldrb r4, [r3], r1 @ a = des [0]
ldrb r5, [r3], r1 @ b = des [dest_pitch]
ldrb r7, [r3], r1 @ c = des[dest_pitch*2]
add lr, src, r1
orr r8, r4, r5, lsl #16 @ b | a
mul r6, c102_154, r8 @ a * 102 + 154 * b
ldrb r8, [r3, r1, lsl #1] @ d = des[dest_pitch*5]
orr r3, r7, r5, lsl #16 @ b | c
mul r9, c51_205, r3 @ b * 205 + 51 * c
add r6, r6, #0x8000
orr r3, r5, r7, lsl #16 @ c | b
mov r6, r6, lsr #24
strb r6, [lr], r1
mul r5, c51_205, r3 @ c * 205 + 154 * b
add r9, r9, #0x8000
orr r3, r8, r7, lsl #16 @ c | d
mov r9, r9, lsr #24
strb r9, [lr], r1
mul r7, c102_154, r3 @ c * 154 + 102 * d
add r5, r5, #0x8000
add src, src, #1
mov r5, r5, lsr #24
strb r5, [lr], r1
add r7, r7, #0x8000
subs r2, r2, #1
mov r7, r7, lsr #24
strb r7, [lr], r1
bne vl35_loop
ldmia sp!, {r4 - r11, pc}
@ @|vertical_band_3_5_scale_armv4|
@/****************************************************************************
@ *
@ * ROUTINE : horizontal_line_3_4_scale_armv4
@ *
@ * INPUTS : const unsigned char *source : Pointer to source data.
@ * unsigned int source_width : Stride of source.
@ * unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_width : Stride of destination (NOT USED).
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Copies horizontal line of pixels from source to
@ * destination scaling up by 3 to 4.
@ *
@ * SPECIAL NOTES : None.
@ *
@ *
@ ****************************************************************************/
@void horizontal_line_3_4_scale_armv4
@(
@ const unsigned char *source,
@ unsigned int source_width,
@ unsigned char *dest,
@ unsigned int dest_width
@)
_HorizontalLine_3_4_Scale_ARMv4:
horizontal_line_3_4_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
ldr r10, =64
ldr r11, =192
mov r9, #128
ldrb r4, [src], #1 @ a = src[0]
hl34_loop:
ldrb r8, [src], #1 @ b = src[1]
ldrb r7, [src], #1 @ c = src[2]
strb r4, [dest], #1
mla r4, r10, r4, r9 @ a*64 + 128
mla r4, r11, r8, r4 @ a*64 + b*192 + 1
add r8, r8, #1 @ b + 1
add r8, r8, r7 @ b + c + 1
mov r8, r8, asr #1 @ (b + c + 1) >> 1
mov r4, r4, asr #8 @ (a*64 + b*192 + 1) >> 8
strb r4, [dest], #1
strb r8, [dest], #1
ldrb r4, [src], #1 @ [a+1]
mla r7, r11, r7, r9 @ c*192 + 128
mla r7, r4, r10, r7 @ a*64 + b*192 + 128
subs srcw, srcw, #3
mov r7, r7, asr #8 @ (a*64 + b*192 + 128) >> 8
strb r7, [dest], #1
bpl hl34_loop
ldrb r8, [src], #1 @ b = src[1]
ldrb r7, [src], #1 @ c = src[2]
strb r4, [dest], #1
mla r4, r10, r4, r9 @ a*64 + 128
mla r4, r11, r8, r4 @ a*64 + b*192 + 1
mov r4, r4, asr #8 @ (a*64 + b*192 + 1) >> 8
strb r4, [dest], #1
add r8, r8, #1 @ b + 1
add r8, r8, r7 @ b + c + 1
mov r8, r8, asr #1 @ (b + c + 1) >> 1
strb r8, [dest], #1
strb r7, [dest], #1
ldmia sp!, {r4 - r11, pc}
@ @|vp8cx_horizontal_line_3_4_scale_c|
@/****************************************************************************
@ *
@ * ROUTINE : vertical_band_3_4_scale_armv4
@ *
@ * INPUTS : unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_pitch : Stride of destination data.
@ * unsigned int dest_width : Width of destination data.
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Scales vertical band of pixels by scale 3 to 4. The
@ * height of the band scaled is 3-pixels.
@ *
@ * SPECIAL NOTES : The routine uses the first line of the band below
@ * the current band.
@ *
@ ****************************************************************************/
@void vertical_band_3_4_scale_armv4
@(
@ r0 = UINT8 *dest
@ r1 = UINT32 dest_pitch
@ r2 = UINT32 dest_width
@)
_VerticalBand_3_4_Scale_ARMv4:
vertical_band_3_4_scale_armv4: @
stmdb sp!, {r4 - r11, lr}
ldr r10, =64
ldr r11, =192
mov r9, #128
@ ldr r1,[r1]
vl34_loop:
mov r3, src
ldrb r4, [r3], r1 @ a = des [0]
ldrb r5, [r3], r1 @ b = des [dest_pitch]
ldrb r7, [r3], r1 @ c = des [dest_pitch*2]
add lr, src, r1
mla r4, r10, r4, r9 @ a*64 + 128
mla r4, r11, r5, r4 @ a*64 + b*192 + 1
add r5, r5, #1 @ b + 1
add r5, r5, r7 @ b + c + 1
mov r5, r5, asr #1 @ (b + c + 1) >> 1
mov r4, r4, asr #8 @ (a*64 + b*192 + 1) >> 8
strb r4, [lr], r1
ldrb r4, [r3, r1] @ a = des [dest_pitch*4]
strb r5, [lr], r1
mla r7, r11, r7, r9 @ c*192 + 128
mla r7, r4, r10, r7 @ a*64 + b*192 + 128
mov r7, r7, asr #8 @ (a*64 + b*192 + 128) >> 8
add src, src, #1
subs r2, r2, #1
strb r7, [lr]
bne vl34_loop
ldmia sp!, {r4 - r11, pc}
@ @|vertical_band_3_4_scale_armv4|
@/****************************************************************************
@ *
@ * ROUTINE : vp8cx_horizontal_line_1_2_scale_c
@ *
@ * INPUTS : const unsigned char *source : Pointer to source data.
@ * unsigned int source_width : Stride of source.
@ * unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_width : Stride of destination (NOT USED).
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Copies horizontal line of pixels from source to
@ * destination scaling up by 1 to 2.
@ *
@ * SPECIAL NOTES : None.
@ *
@ ****************************************************************************/
@void vp8cx_horizontal_line_1_2_scale_c
@(
@ const unsigned char *source,
@ unsigned int source_width,
@ unsigned char *dest,
@ unsigned int dest_width
@)
_HorizontalLine_1_2_Scale_ARMv4:
horizontal_line_1_2_scale_armv4: @
stmdb sp!, {r4 - r5, lr}
sub srcw, srcw, #1
ldrb r3, [src], #1
ldrb r4, [src], #1
hl12_loop:
subs srcw, srcw, #1
add r5, r3, r4
add r5, r5, #1
mov r5, r5, lsr #1
orr r5, r3, r5, lsl #8
strh r5, [dest], #2
mov r3, r4
ldrneb r4, [src], #1
bne hl12_loop
orr r5, r4, r4, lsl #8
strh r5, [dest]
ldmia sp!, {r4 - r5, pc}
@ @|vertical_band_3_5_scale_armv4|
@/****************************************************************************
@ *
@ * ROUTINE : vp8cx_vertical_band_1_2_scale_c
@ *
@ * INPUTS : unsigned char *dest : Pointer to destination data.
@ * unsigned int dest_pitch : Stride of destination data.
@ * unsigned int dest_width : Width of destination data.
@ *
@ * OUTPUTS : None.
@ *
@ * RETU.req_s : void
@ *
@ * FUNCTION : Scales vertical band of pixels by scale 1 to 2. The
@ * height of the band scaled is 1-pixel.
@ *
@ * SPECIAL NOTES : The routine uses the first line of the band below
@ * the current band.
@ *
@ ****************************************************************************/
@void vp8cx_vertical_band_1_2_scale_c
@(
@ r0 = UINT8 *dest
@ r1 = UINT32 dest_pitch
@ r2 = UINT32 dest_width
@)
_VerticalBand_1_2_Scale_ARMv4:
vertical_band_1_2_scale_armv4: @
stmdb sp!, {r4 - r7, lr}
ldr mask, =0xff00ff @ mask for selection
ldr lr, = 0x010001
vl12_loop:
mov r3, src
ldr r4, [r3], r1
ldr r5, [r3, r1]
add src, src, #4
subs r2, r2, #4
and r6, r4, mask
and r7, r5, mask
add r6, r7, r6
add r6, r6, lr
and r4, mask, r4, lsr #8
and r5, mask, r5, lsr #8
mov r6, r6, lsr #1
and r6, r6, mask
add r4, r5, r4
add r4, r4, lr
mov r4, r4, lsr #1
and r4, r4, mask
orr r5, r6, r4, lsl #8
str r5, [r3]
bpl vl12_loop
ldmia sp!, {r4 - r7, pc}
@ @|vertical_band_3_5_scale_armv4|