`n_redc, n_redc_fast`

Synopsis#include <flint/nmod.h>

ulong n_redc(ulong x, ulong n, ulong nred)source

ulong n_redc_fast(ulong x, ulong n, ulong nred)source

Return $x R^{-1} \bmod n$ for any word $x$ . n_redc_fast returns a value in $[0, n]$ , which may need one more subtraction of $n$ .

Guides#

Using Montgomery arithmetic

Cite this page

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

@misc{flint-doc-nmod-n-redc,
  author       = {{The FLINT team}},
  title        = {{n\_redc, n\_redc\_fast (nmod.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/nmod/n_redc.html},
  note         = {Generated 2026-11-02}
}

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