ref: 9679be4bc0b0ff64c1dcce776c83a33968253826
dir: /vp8/common/arm/armv6/copymem8x4_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_mem8x4_v6| ; ARM ; REQUIRE8 ; PRESERVE8 AREA Block, CODE, READONLY ; name this block of code ;void vp8_copy_mem8x4_v6( unsigned char *src, int src_stride, unsigned char *dst, int dst_stride) ;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= |vp8_copy_mem8x4_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_mem8x4_fast ands r4, r0, #3 beq copy_mem8x4_4 ;copy 1 byte each time ldrb r4, [r0] ldrb r5, [r0, #1] mov r12, #4 copy_mem8x4_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_mem8x4_1_loop ldmia sp!, {r4 - r5} ;pop {r4-r5} mov pc, lr ;copy 4 bytes each time copy_mem8x4_4 ldr r4, [r0] ldr r5, [r0, #4] mov r12, #4 copy_mem8x4_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_mem8x4_4_loop ldmia sp!, {r4-r5} ;pop {r4-r5} mov pc, lr ;copy 8 bytes each time copy_mem8x4_fast ;sub r1, r1, #8 ;sub r3, r3, #8 mov r12, #4 copy_mem8x4_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_mem8x4_fast_loop ldmia sp!, {r4-r5} ;pop {r4-r5} mov pc, lr ENDP ; |vp8_copy_mem8x4_v6| END