fls man page on OpenSuSE

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FLS(9)			   Basic C Library Functions			FLS(9)

NAME
       fls - find last set bit in word

SYNOPSIS
       int fls(int x);

ARGUMENTS
       x
	   the word to search

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

       fls(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 32.

COPYRIGHT
Kernel Hackers Manual 3.11	 November 2013				FLS(9)
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