| ILOG2(3) | Library Functions Manual | ILOG2(3) | 
ilog2 —
#include <sys/bitops.h>
size
  
  ilog2(size
    x);
ilog2() 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.
ilog2() macro first appeared in
  NetBSD 5.0.
| May 10, 2011 | NetBSD 9.3 |