/* 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 .weak _memcpy ENTRY(_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 _memcpy,.-_memcpy libc_hidden_def (memcpy)