arch/openrisc/include/asm/bitops/__ffs.h

   1 /*
   2  * OpenRISC Linux
   3  *
   4  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
   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
  30 #include <asm-generic/bitops/__ffs.h>
  31 #endif
  32
  33 #endif /* __ASM_OPENRISC___FFS_H */