NAME
ilog2 —
integer logarithm
SYNOPSIS
#include
<sys/bitops.h>
size
ilog2(size
x);
DESCRIPTION
Theilog2()
macro returns an integer (binary) logarithm of x. It is
the logarithm for base 2; the binary logarithm of x is
the power to which the number 2 must be raised to obtain the value
x.
The type of the input parameter should be either uint32_t or uint64_t.
ERRORS
A value -1 is returned on error.
SEE ALSO
HISTORY
The ilog2() macro first appeared in
NetBSD 5.0.