include/asm-generic/bitops/builtin-fls.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
   3 #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
   4
   5 /**
   6  * fls - find last (most-significant) bit set
   7  * @x: the word to search
   8  *
   9  * This is defined the same way as ffs.
  10  * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
  11  */
  12 static __always_inline int fls(unsigned int x)
  13 {
  14         return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
  15 }
  16
  17 #endif