Merge branch 'for-3.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[linux/fpc-iii.git] / arch / unicore32 / include / asm / bitops.h
blob401f597bc38cfcdf102ff6188f8bd3c27f46dde5
1 /*
2 * linux/arch/unicore32/include/asm/bitops.h
4 * Code specific to PKUnity SoC and UniCore ISA
6 * Copyright (C) 2001-2010 GUAN Xue-tao
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #ifndef __UNICORE_BITOPS_H__
14 #define __UNICORE_BITOPS_H__
16 #define _ASM_GENERIC_BITOPS_FLS_H_
17 #define _ASM_GENERIC_BITOPS___FLS_H_
18 #define _ASM_GENERIC_BITOPS_FFS_H_
19 #define _ASM_GENERIC_BITOPS___FFS_H_
21 * On UNICORE, those functions can be implemented around
22 * the cntlz instruction for much better code efficiency.
25 static inline int fls(int x)
27 int ret;
29 asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc");
30 ret = 32 - ret;
32 return ret;
35 #define __fls(x) (fls(x) - 1)
36 #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
37 #define __ffs(x) (ffs(x) - 1)
39 #include <asm-generic/bitops.h>
41 /* following definitions: to avoid using codes in lib/find_*.c */
42 #define find_next_bit find_next_bit
43 #define find_next_zero_bit find_next_zero_bit
44 #define find_first_bit find_first_bit
45 #define find_first_zero_bit find_first_zero_bit
47 #endif /* __UNICORE_BITOPS_H__ */