FLS64(9)                            Basic C Library Functions                            FLS64(9)



NAME
       fls64 - find last set bit in a 64-bit word

SYNOPSIS
       int fls64(__u64 x);

ARGUMENTS
       x
           the word to search

DESCRIPTION
       This is defined in a similar way as the libc and compiler builtin ffsll, but returns the
       position of the most significant set bit.

       fls64(value) returns 0 if value is 0 or the position of the last set bit if value is
       nonzero. The last (most significant) bit is at position 64.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                                  FLS64(9)