`flint_mpn_fmms1`

Synopsis#include <flint/mpn_extras.h>

mp_size_t flint_mpn_fmms1(mp_ptr y, mp_limb_t a1, mp_srcptr x1, mp_limb_t a2, mp_srcptr x2, mp_size_t n)source

Tries to compute $y = a_1 x_1 - a_2 x_2$ , where $x_1$ and $x_2$ have $n \ge 1$ limbs (not necessarily normalised). If the result is nonnegative and fits in $n$ limbs, it is written to $(y, n)$ and its normalised length is returned; otherwise $-1$ is returned and $(y, n)$ holds garbage. $y$ may alias $x_1$ but not $x_2$ .

Cite this page

The FLINT team, “flint_mpn_fmms1 (mpn_extras.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/mpn_extras/flint_mpn_fmms1.html (generated 2026-11-02).

@misc{flint-doc-mpn-extras-flint-mpn-fmms1,
  author       = {{The FLINT team}},
  title        = {{flint\_mpn\_fmms1 (mpn\_extras.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/mpn_extras/flint_mpn_fmms1.html},
  note         = {Generated 2026-11-02}
}

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