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fls.h

#ifndef _ASM_GENERIC_BITOPS_FLS_H_
#define _ASM_GENERIC_BITOPS_FLS_H_

/**
 * fls - find last (most-significant) bit set
 * @x: the word to search
 *
 * This is defined the same way as ffs.
 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
 */

static inline int __fls(int x)
{
      int r = 32;

      if (!x)
            return 0;
      if (!(x & 0xffff0000u)) {
            x <<= 16;
            r -= 16;
      }
      if (!(x & 0xff000000u)) {
            x <<= 8;
            r -= 8;
      }
      if (!(x & 0xf0000000u)) {
            x <<= 4;
            r -= 4;
      }
      if (!(x & 0xc0000000u)) {
            x <<= 2;
            r -= 2;
      }
      if (!(x & 0x80000000u)) {
            x <<= 1;
            r -= 1;
      }
      return r;
}

#endif /* _ASM_GENERIC_BITOPS_FLS_H_ */

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