`_fmpz_sub_small`

Synopsis#include <flint/fmpz_extras.h>

slong _fmpz_sub_small(const fmpz_t x, const fmpz_t y)source

Returns $x - y$ as an slong when it can be represented cheaply: exactly if $x$ and $y$ are both inline or if $|x - y| \le$ COEFF_MAX, and otherwise WORD_MAX or -WORD_MAX with the sign of $x - y$ . The sign of the result is always correct, which suffices to compare exponents and to decide whether two floating-point numbers overlap.

Guides#

The fmpz representation (fmpz)

Cite this page

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

@misc{flint-doc-fmpz-extras-fmpz-sub-small,
  author       = {{The FLINT team}},
  title        = {{\_fmpz\_sub\_small (fmpz\_extras.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/fmpz_extras/_fmpz_sub_small.html},
  note         = {Generated 2026-11-02}
}

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