| /* Copyright (C) 1998-2016 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Philip Blundell <philb@gnu.org> |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* Thumb requires excessive IT insns here. */ |
| #define NO_THUMB |
| #include <sysdep.h> |
| |
| .text |
| .syntax unified |
| |
| /* void *memset (dstpp, c, len) */ |
| |
| ENTRY(memset) |
| mov r3, r0 |
| cmp r2, #8 |
| bcc 2f @ less than 8 bytes to move |
| |
| 1: |
| tst r3, #3 @ aligned yet? |
| sfi_breg r3, \ |
| strbne r1, [\B], #1 |
| subne r2, r2, #1 |
| bne 1b |
| |
| and r1, r1, #255 @ clear any sign bits |
| orr r1, r1, r1, lsl $8 |
| orr r1, r1, r1, lsl $16 |
| mov ip, r1 |
| |
| 1: |
| subs r2, r2, #8 |
| sfi_breg r3, \ |
| stmiacs \B!, {r1, ip} @ store up to 32 bytes per loop iteration |
| subscs r2, r2, #8 |
| sfi_breg r3, \ |
| stmiacs \B!, {r1, ip} |
| subscs r2, r2, #8 |
| sfi_breg r3, \ |
| stmiacs \B!, {r1, ip} |
| subscs r2, r2, #8 |
| sfi_breg r3, \ |
| stmiacs \B!, {r1, ip} |
| bcs 1b |
| |
| and r2, r2, #7 |
| 2: |
| subs r2, r2, #1 @ store up to 4 bytes per loop iteration |
| sfi_breg r3, \ |
| strbcs r1, [\B], #1 |
| subscs r2, r2, #1 |
| sfi_breg r3, \ |
| strbcs r1, [\B], #1 |
| subscs r2, r2, #1 |
| sfi_breg r3, \ |
| strbcs r1, [\B], #1 |
| subscs r2, r2, #1 |
| sfi_breg r3, \ |
| strbcs r1, [\B], #1 |
| bcs 2b |
| |
| DO_RET(lr) |
| END(memset) |
| libc_hidden_builtin_def (memset) |