/* pow2, Copyright (c) 2016 Dave Odell <dmo2118@gmail.com>
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
extern int i_log2(size_t x
);
extern size_t to_pow2 (size_t x
); /* return the next larger power of 2. */