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51 lines
1.4 KiB
ArmAsm
51 lines
1.4 KiB
ArmAsm
/* ffsll -- find first set bit in a long long, from least significant end.
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Copyright (C) 2013-2018 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 (ffsll)
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@ If low part is 0, operate on the high part. Ensure that the
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@ word on which we operate is in r0. Set r2 to the bit offset
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@ of the word being considered. Set the flags for the word
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@ being operated on.
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#ifdef __ARMEL__
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cmp r0, #0
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itee ne
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movne r2, #0
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moveq r2, #32
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movseq r0, r1
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#else
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cmp r1, #0
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ittee ne
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movne r2, #0
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movne r0, r1
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moveq r2, #32
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cmpeq r0, #0
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#endif
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@ Perform the ffs on r0.
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rbit r0, r0
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ittt ne
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clzne r0, r0
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addne r2, r2, #1
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addne r0, r0, r2
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bx lr
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END (ffsll)
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