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- /* Copyright (C) 1999-2019 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)
|
