Name

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

Synopsis

int fls64 (__u64 x);
 

Arguments

__u64 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.