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37 lines
1.1 KiB
ArmAsm
37 lines
1.1 KiB
ArmAsm
/* ffs -- find first set bit in an int, from least significant end.
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Copyright (C) 2013-2015 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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.syntax unified
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.text
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ENTRY (__ffs)
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cmp r0, #0
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rbit r0, r0
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itt ne
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clzne r0, r0
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addne r0, r0, #1
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bx lr
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END (__ffs)
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weak_alias (__ffs, ffs)
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weak_alias (__ffs, ffsl)
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libc_hidden_def (__ffs)
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libc_hidden_builtin_def (ffs)
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