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

   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
  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 */