1FLS64(9)                   Basic C Library Functions                  FLS64(9)
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NAME

6       fls64 - find last set bit in a 64-bit word
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SYNOPSIS

9       int fls64(__u64 x);
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ARGUMENTS

12       x
13           the word to search
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DESCRIPTION

16       This is defined in a similar way as the libc and compiler builtin
17       ffsll, but returns the position of the most significant set bit.
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19       fls64(value) returns 0 if value is 0 or the position of the last set
20       bit if value is nonzero. The last (most significant) bit is at position
21       64.
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24Kernel Hackers Manual 3.10         June 2019                          FLS64(9)
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