4 * Copyright 2004-2007 Analog Devices Inc.
5 * Enter bugs at http://blackfin.uclinux.org/
7 * SPDX-License-Identifier: GPL-2.0+
13 * C Library function MEMMOVE
14 * R0 = To Address (leave unchanged to form result)
21 .type _memmove, STT_FUNC;
24 P0 = R0; /* P0 = To address */
25 P3 = R1; /* P3 = From Address */
26 P2 = R2 ; /* P2 = count */
27 CC = P2 == 0; /* Check zero count*/
28 IF CC JUMP .Lfinished; /* very unlikely */
30 CC = R1 < R0 (IU); /* From < To */
31 IF !CC JUMP .Lno_overlap;
33 CC = R0 <= R3 (IU); /* (From+len) >= To */
39 R3 = R1 | R0; /* OR addresses together */
40 R3 <<= 30; /* check bottom two bits */
41 CC = AZ; /* AZ set if zero.*/
42 IF !CC JUMP .Lbytes ; /* Jump if addrs not aligned.*/
45 P1 = P2 >> 2; /* count = n/4 */
48 R2 = R2 & R3; /* remainder */
49 P2 = R2; /* set remainder */
52 LSETUP (.Lquad_loop , .Lquad_loop) LC0=P1;
53 .Lquad_loop: MNOP || [P0++] = R1 || R1 = [I0++];
56 CC = P2 == 0; /* any remaining bytes? */
57 P3 = I0; /* Ammend P3 to updated ptr. */
62 .Lbytes: LSETUP (.Lbyte2_s , .Lbyte2_e) LC0=P2;
63 .Lbyte2_s: R1 = B[P3++](Z);
64 .Lbyte2_e: B[P0++] = R1;
76 LSETUP (.Lol_s, .Lol_e) LC0 = P2;
78 .Lol_e: R1 = B[P3--] (Z);
79 .Lno_loop: B[P0] = R1;
83 .size _memmove, .-_memmove