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 3.11 November 2013 FLS64(9)[top]
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