mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
84 lines
1.5 KiB
ArmAsm
84 lines
1.5 KiB
ArmAsm
/* Copyright (C) 1999-2012 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
|
|
|
|
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/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* size_t strlen (const char *s) */
|
|
|
|
ENTRY(strlen)
|
|
mov r4, r0
|
|
and #3, r0
|
|
tst r0, r0
|
|
bt/s 1f
|
|
mov #0, r2
|
|
|
|
add #-1, r0
|
|
shll2 r0
|
|
shll r0
|
|
braf r0
|
|
nop
|
|
|
|
mov.b @r4+, r1
|
|
tst r1, r1
|
|
bt 8f
|
|
add #1, r2
|
|
|
|
mov.b @r4+, r1
|
|
tst r1, r1
|
|
bt 8f
|
|
add #1, r2
|
|
|
|
mov.b @r4+, r1
|
|
tst r1, r1
|
|
bt 8f
|
|
add #1, r2
|
|
|
|
1:
|
|
mov #0, r3
|
|
2:
|
|
mov.l @r4+, r1
|
|
cmp/str r3, r1
|
|
bf/s 2b
|
|
add #4, r2
|
|
|
|
add #-4, r2
|
|
#ifdef __BIG_ENDIAN__
|
|
swap.b r1, r1
|
|
swap.w r1, r1
|
|
swap.b r1, r1
|
|
#endif
|
|
extu.b r1, r0
|
|
tst r0, r0
|
|
bt/s 8f
|
|
shlr8 r1
|
|
add #1, r2
|
|
extu.b r1, r0
|
|
tst r0, r0
|
|
bt/s 8f
|
|
shlr8 r1
|
|
add #1, r2
|
|
extu.b r1, r0
|
|
tst r0, r0
|
|
bt 8f
|
|
add #1, r2
|
|
8:
|
|
rts
|
|
mov r2, r0
|
|
END(strlen)
|
|
libc_hidden_builtin_def (strlen)
|