log2, log2f, log2l - base-2 logarithmic function
These functions return the base 2 logarithm of
On success, these functions return the base 2 logarithm of
For special cases, including where
x is 0, 1, negative,
infinity, or NaN, see log(3).
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning
double also conforms to SVr4,
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