xref: /linux/arch/openrisc/include/asm/bitops/__ffs.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37) 
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * OpenRISC Linux
4  *
5  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
6  */
7 
8 #ifndef __ASM_OPENRISC___FFS_H
9 #define __ASM_OPENRISC___FFS_H
10 
11 
12 #ifdef CONFIG_OPENRISC_HAVE_INST_FF1
13 
__ffs(unsigned long x)14 static inline unsigned long __ffs(unsigned long x)
15 {
16 	int ret;
17 
18 	__asm__ ("l.ff1 %0,%1"
19 		 : "=r" (ret)
20 		 : "r" (x));
21 
22 	return ret-1;
23 }
24 
25 #else
26 #include <asm-generic/bitops/__ffs.h>
27 #endif
28 
29 #endif /* __ASM_OPENRISC___FFS_H */
30