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/* * linux/arch/unicore32/include/asm/bitops.h * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __UNICORE_BITOPS_H__ #define __UNICORE_BITOPS_H__ #define _ASM_GENERIC_BITOPS_FLS_H_ #define _ASM_GENERIC_BITOPS___FLS_H_ #define _ASM_GENERIC_BITOPS_FFS_H_ #define _ASM_GENERIC_BITOPS___FFS_H_ /* * On UNICORE, those functions can be implemented around * the cntlz instruction for much better code efficiency. */ static inline int fls(int x) { int ret; asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc"); ret = 32 - ret; return ret; } #define __fls(x) (fls(x) - 1) #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) #define __ffs(x) (ffs(x) - 1) #include <asm-generic/bitops.h> /* following definitions: to avoid using codes in lib/find_*.c */ #define find_next_bit find_next_bit #define find_next_zero_bit find_next_zero_bit #define find_first_bit find_first_bit #define find_first_zero_bit find_first_zero_bit #endif /* __UNICORE_BITOPS_H__ */