]>
Commit | Line | Data |
---|---|---|
5695fc84 | 1 | /* ffsll -- find first set bit in a long long, from least significant end. |
d4697bc9 | 2 | Copyright (C) 2013-2014 Free Software Foundation, Inc. |
5695fc84 RH |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <sysdep.h> | |
20 | ||
21 | .syntax unified | |
22 | .text | |
23 | ||
24 | ENTRY (ffsll) | |
25 | @ If low part is 0, operate on the high part. Ensure that the | |
26 | @ word on which we operate is in r0. Set r2 to the bit offset | |
27 | @ of the word being considered. Set the flags for the word | |
28 | @ being operated on. | |
29 | #ifdef __ARMEL__ | |
30 | cmp r0, #0 | |
31 | itee ne | |
32 | movne r2, #0 | |
33 | moveq r2, #32 | |
34 | movseq r0, r1 | |
35 | #else | |
36 | cmp r1, #0 | |
37 | ittee ne | |
38 | movne r2, #0 | |
39 | movne r0, r1 | |
40 | moveq r2, #32 | |
41 | cmpeq r0, #0 | |
42 | #endif | |
43 | @ Perform the ffs on r0. | |
44 | rbit r0, r0 | |
45 | ittt ne | |
46 | clzne r0, r0 | |
47 | addne r2, r2, #1 | |
48 | addne r0, r0, r2 | |
49 | bx lr | |
50 | END (ffsll) |