| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* memchr.S |
| 2 | * Copyright (C) 2003-2007 Analog Devices Inc., All Rights Reserved. |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU Library General |
| 5 | * Public License. See the file "COPYING.LIB" in the main directory of this |
| 6 | * archive for more details. |
| 7 | * |
| 8 | * Non-LGPL License also available as part of VisualDSP++ |
| 9 | * http://www.analog.com/processors/resources/crosscore/visualDspDevSoftware.html |
| 10 | */ |
| 11 | |
| 12 | #include <sysdep.h> |
| 13 | |
| 14 | /* void *memchr(const void *s, int c, size_t n); |
| 15 | * R0 = address (s) |
| 16 | * R1 = sought byte (c) |
| 17 | * R2 = count (n) |
| 18 | * |
| 19 | * Returns pointer to located character. |
| 20 | */ |
| 21 | |
| 22 | .text |
| 23 | |
| 24 | .align 2 |
| 25 | |
| 26 | .weak _memchr |
| 27 | ENTRY(_memchr) |
| 28 | P0 = R0; /* P0 = address */ |
| 29 | P2 = R2; /* P2 = count */ |
| 30 | R1 = R1.B(Z); |
| 31 | CC = R2 == 0; |
| 32 | IF CC JUMP .Lfailed; |
| 33 | |
| 34 | .Lbytes: |
| 35 | LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2; |
| 36 | |
| 37 | .Lbyte_loop_s: |
| 38 | R3 = B[P0++](Z); |
| 39 | CC = R3 == R1; |
| 40 | IF CC JUMP .Lfound; |
| 41 | .Lbyte_loop_e: |
| 42 | NOP; |
| 43 | |
| 44 | .Lfailed: |
| 45 | R0=0; |
| 46 | RTS; |
| 47 | |
| 48 | .Lfound: |
| 49 | R0 = P0; |
| 50 | R0 += -1; |
| 51 | RTS; |
| 52 | |
| 53 | .size _memchr,.-_memchr |
| 54 | |
| 55 | libc_hidden_def (memchr) |