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/* memcpy.S
* Copyright (C) 2003-2007 Analog Devices Inc., All Rights Reserved.
*
* This file is subject to the terms and conditions of the GNU Library General
* Public License. See the file "COPYING.LIB" in the main directory of this
* archive for more details.
*
* Non-LGPL License also available as part of VisualDSP++
* http://www.analog.com/processors/resources/crosscore/visualDspDevSoftware.html
*/
#include <sysdep.h>
/* void *memcpy(void *dest, const void *src, size_t n);
* R0 = To Address (dest) (leave unchanged to form result)
* R1 = From Address (src)
* R2 = count
*
* Note: Favours word alignment
*/
.text
.align 2
/* We have to bypass the libc-symbols.h machinery to make sure we get
* a weak symbol for memcpy (some crummy gcc tests want to redefine it).
*/
.global ___GI_memcpy
.type ___GI_memcpy, STT_FUNC
___GI_memcpy:
[--SP] = P3;
P0 = R0; /* P0 = To address */
P3 = R1; /* P3 = From Address */
P2 = R2; /* P2 = count */
CC = R2 <= 7(IU);
IF CC JUMP .Ltoo_small;
I0 = R1;
R3 = R1 | R0; /* OR addresses together */
R3 <<= 30; /* check bottom two bits */
CC = AZ; /* AZ set if zero. */
IF !CC JUMP .Lbytes; /* Jump if addrs not aligned. */
P1 = P2 >> 2; /* count = n/4 */
P1 += -1;
R3 = 3;
R2 = R2 & R3; /* remainder */
P2 = R2; /* set remainder */
R1 = [I0++];
#if !defined(__WORKAROUND_AVOID_DAG1)
LSETUP (.Lquad_loop, .Lquad_loop) LC0=P1;
.Lquad_loop: MNOP || [P0++] = R1 || R1 = [I0++];
#else
LSETUP (.Lquad_loop_s, .Lquad_loop_e) LC0=P1;
.Lquad_loop_s: [P0++] = R1;
.Lquad_loop_e: R1 = [I0++];
#endif
[P0++] = R1;
CC = P2 == 0; /* any remaining bytes? */
P3 = I0; /* Ammend P3 for remaining copy */
IF !CC JUMP .Lbytes;
P3 = [SP++];
RTS;
.Ltoo_small:
CC = P2 == 0; /* Check zero count */
IF CC JUMP .Lfinished; /* very unlikely */
.Lbytes:
LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
.Lbyte_loop_s: R1 = B[P3++](Z);
.Lbyte_loop_e: B[P0++] = R1;
.Lfinished:
P3 = [SP++];
RTS;
.size ___GI_memcpy,.-___GI_memcpy
.hidden ___GI_memcpy
.weak _memcpy
.set _memcpy,___GI_memcpy
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