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__ffs.h
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1 /*
2  * OpenRISC Linux
3  *
4  * Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11 
12 #ifndef __ASM_OPENRISC___FFS_H
13 #define __ASM_OPENRISC___FFS_H
14 
15 
16 #ifdef CONFIG_OPENRISC_HAVE_INST_FF1
17 
18 static inline unsigned long __ffs(unsigned long x)
19 {
20  int ret;
21 
22  __asm__ ("l.ff1 %0,%1"
23  : "=r" (ret)
24  : "r" (x));
25 
26  return ret-1;
27 }
28 
29 #else
31 #endif
32 
33 #endif /* __ASM_OPENRISC___FFS_H */