fits_s.h
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上传日期:2022-08-06
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- /* int mpz_fits_X_p (mpz_t z) -- test whether z fits signed type X.
- Copyright 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- int
- FUNCTION (mpz_srcptr z)
- {
- mp_size_t n = SIZ(z);
- mp_ptr p = PTR(z);
- mp_limb_t limb = p[0];
- if (n == 0)
- return 1;
- if (n == 1)
- return limb <= MAXIMUM;
- if (n == -1)
- return limb <= - (mp_limb_t) MINIMUM;
- #if GMP_NAIL_BITS != 0
- {
- if ((p[1] >> GMP_NAIL_BITS) == 0)
- {
- limb += p[1] << GMP_NUMB_BITS;
- if (n == 2)
- return limb <= MAXIMUM;
- if (n == -2)
- return limb <= - (mp_limb_t) MINIMUM;
- }
- }
- #endif
- return 0;
- }