`n_clog2, n_flog2`

Synopsis#include <flint/fft_small.h>

ulong n_clog2(ulong x)source

ulong n_flog2(ulong x)source

Return $\lceil \log_2 x \rceil$ and $\lfloor \log_2 x \rfloor$ for $x \ge 1$ ; both are 0 for $x = 0$ .

Cite this page

The FLINT team, “n_clog2, n_flog2 (fft_small.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/fft_small/n_clog2.html (generated 2026-11-02).

@misc{flint-doc-fft-small-n-clog2,
  author       = {{The FLINT team}},
  title        = {{n\_clog2, n\_flog2 (fft\_small.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/fft_small/n_clog2.html},
  note         = {Generated 2026-11-02}
}

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