83 lines
1.5 KiB
ArmAsm
83 lines
1.5 KiB
ArmAsm
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/* Copyright (C) 1999-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* size_t strlen (const char *s) */
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ENTRY(strlen)
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mov r4, r0
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and #3, r0
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tst r0, r0
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bt/s 1f
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mov #0, r2
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add #-1, r0
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shll2 r0
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shll r0
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braf r0
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nop
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mov.b @r4+, r1
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tst r1, r1
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bt 8f
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add #1, r2
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mov.b @r4+, r1
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tst r1, r1
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bt 8f
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add #1, r2
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mov.b @r4+, r1
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tst r1, r1
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bt 8f
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add #1, r2
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1:
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mov #0, r3
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2:
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mov.l @r4+, r1
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cmp/str r3, r1
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bf/s 2b
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add #4, r2
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add #-4, r2
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#ifdef __BIG_ENDIAN__
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swap.b r1, r1
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swap.w r1, r1
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swap.b r1, r1
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#endif
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extu.b r1, r0
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tst r0, r0
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bt/s 8f
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shlr8 r1
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add #1, r2
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extu.b r1, r0
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tst r0, r0
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bt/s 8f
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shlr8 r1
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add #1, r2
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extu.b r1, r0
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tst r0, r0
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bt 8f
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add #1, r2
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8:
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rts
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mov r2, r0
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END(strlen)
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libc_hidden_builtin_def (strlen)
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