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-/* ffsll -- find first set bit in a long long, from least significant end.
- Copyright (C) 2013-2017 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- 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>
-
- .syntax unified
- .text
-
-ENTRY (ffsll)
- @ If low part is 0, operate on the high part. Ensure that the
- @ word on which we operate is in r0. Set r2 to the bit offset
- @ of the word being considered. Set the flags for the word
- @ being operated on.
-#ifdef __ARMEL__
- cmp r0, #0
- itee ne
- movne r2, #0
- moveq r2, #32
- movseq r0, r1
-#else
- cmp r1, #0
- ittee ne
- movne r2, #0
- movne r0, r1
- moveq r2, #32
- cmpeq r0, #0
-#endif
- @ Perform the ffs on r0.
- rbit r0, r0
- ittt ne
- clzne r0, r0
- addne r2, r2, #1
- addne r0, r0, r2
- bx lr
-END (ffsll)