ref: d8aa40634a522a10635c5982cfd52bbfba15591b
dir: /vp8/common/arm/armv6/copymem8x8_v6.asm/
;
; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
;
; Use of this source code is governed by a BSD-style license
; that can be found in the LICENSE file in the root of the source
; tree. An additional intellectual property rights grant can be found
; in the file PATENTS. All contributing project authors may
; be found in the AUTHORS file in the root of the source tree.
;
EXPORT |vp8_copy_mem8x8_v6|
; ARM
; REQUIRE8
; PRESERVE8
AREA Block, CODE, READONLY ; name this block of code
;void copy_mem8x8_v6( unsigned char *src, int src_stride, unsigned char *dst, int dst_stride)
;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
|vp8_copy_mem8x8_v6| PROC
;push {r4-r5}
stmdb sp!, {r4-r5}
;preload
pld [r0]
pld [r0, r1]
pld [r0, r1, lsl #1]
ands r4, r0, #7
beq copy_mem8x8_fast
ands r4, r0, #3
beq copy_mem8x8_4
;copy 1 byte each time
ldrb r4, [r0]
ldrb r5, [r0, #1]
mov r12, #8
copy_mem8x8_1_loop
strb r4, [r2]
strb r5, [r2, #1]
ldrb r4, [r0, #2]
ldrb r5, [r0, #3]
subs r12, r12, #1
strb r4, [r2, #2]
strb r5, [r2, #3]
ldrb r4, [r0, #4]
ldrb r5, [r0, #5]
strb r4, [r2, #4]
strb r5, [r2, #5]
ldrb r4, [r0, #6]
ldrb r5, [r0, #7]
add r0, r0, r1
strb r4, [r2, #6]
strb r5, [r2, #7]
add r2, r2, r3
ldrneb r4, [r0]
ldrneb r5, [r0, #1]
bne copy_mem8x8_1_loop
ldmia sp!, {r4 - r5}
;pop {r4-r5}
mov pc, lr
;copy 4 bytes each time
copy_mem8x8_4
ldr r4, [r0]
ldr r5, [r0, #4]
mov r12, #8
copy_mem8x8_4_loop
subs r12, r12, #1
add r0, r0, r1
str r4, [r2]
str r5, [r2, #4]
add r2, r2, r3
ldrne r4, [r0]
ldrne r5, [r0, #4]
bne copy_mem8x8_4_loop
ldmia sp!, {r4 - r5}
;pop {r4-r5}
mov pc, lr
;copy 8 bytes each time
copy_mem8x8_fast
;sub r1, r1, #8
;sub r3, r3, #8
mov r12, #8
copy_mem8x8_fast_loop
ldmia r0, {r4-r5}
;ldm r0, {r4-r5}
add r0, r0, r1
subs r12, r12, #1
stmia r2, {r4-r5}
;stm r2, {r4-r5}
add r2, r2, r3
bne copy_mem8x8_fast_loop
ldmia sp!, {r4-r5}
;pop {r4-r5}
mov pc, lr
ENDP ; |vp8_copy_mem8x8_v6|
END