128 lines
2.4 KiB
NASM
128 lines
2.4 KiB
NASM
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; Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license and patent
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; grant that can be found in the LICENSE file in the root of the source
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; tree. All contributing project authors may be found in the AUTHORS
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; file in the root of the source tree.
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;
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EXPORT |vp8_copy_mem8x4_v6|
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; ARM
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; REQUIRE8
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; PRESERVE8
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AREA Block, CODE, READONLY ; name this block of code
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;void vp8_copy_mem8x4_v6( unsigned char *src, int src_stride, unsigned char *dst, int dst_stride)
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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|vp8_copy_mem8x4_v6| PROC
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;push {r4-r5}
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stmdb sp!, {r4-r5}
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;preload
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pld [r0]
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pld [r0, r1]
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pld [r0, r1, lsl #1]
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ands r4, r0, #7
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beq copy_mem8x4_fast
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ands r4, r0, #3
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beq copy_mem8x4_4
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;copy 1 byte each time
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ldrb r4, [r0]
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ldrb r5, [r0, #1]
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mov r12, #4
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copy_mem8x4_1_loop
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strb r4, [r2]
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strb r5, [r2, #1]
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ldrb r4, [r0, #2]
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ldrb r5, [r0, #3]
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subs r12, r12, #1
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strb r4, [r2, #2]
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strb r5, [r2, #3]
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ldrb r4, [r0, #4]
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ldrb r5, [r0, #5]
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strb r4, [r2, #4]
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strb r5, [r2, #5]
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ldrb r4, [r0, #6]
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ldrb r5, [r0, #7]
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add r0, r0, r1
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strb r4, [r2, #6]
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strb r5, [r2, #7]
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add r2, r2, r3
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ldrneb r4, [r0]
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ldrneb r5, [r0, #1]
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bne copy_mem8x4_1_loop
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ldmia sp!, {r4 - r5}
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;pop {r4-r5}
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mov pc, lr
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;copy 4 bytes each time
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copy_mem8x4_4
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ldr r4, [r0]
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ldr r5, [r0, #4]
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mov r12, #4
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copy_mem8x4_4_loop
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subs r12, r12, #1
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add r0, r0, r1
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str r4, [r2]
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str r5, [r2, #4]
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add r2, r2, r3
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ldrne r4, [r0]
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ldrne r5, [r0, #4]
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bne copy_mem8x4_4_loop
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ldmia sp!, {r4-r5}
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;pop {r4-r5}
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mov pc, lr
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;copy 8 bytes each time
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copy_mem8x4_fast
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;sub r1, r1, #8
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;sub r3, r3, #8
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mov r12, #4
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copy_mem8x4_fast_loop
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ldmia r0, {r4-r5}
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;ldm r0, {r4-r5}
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add r0, r0, r1
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subs r12, r12, #1
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stmia r2, {r4-r5}
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;stm r2, {r4-r5}
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add r2, r2, r3
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bne copy_mem8x4_fast_loop
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ldmia sp!, {r4-r5}
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;pop {r4-r5}
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mov pc, lr
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ENDP ; |vp8_copy_mem8x4_v6|
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END
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