cmp_ui.c
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上传日期:2022-08-06
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文件大小:2k
- /* mpz_cmp_ui.c -- Compare a mpz_t a with an mp_limb_t b. Return positive,
- zero, or negative based on if a > b, a == b, or a < b.
- Copyright 1991, 1993, 1994, 1995, 1996, 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
- _mpz_cmp_ui (mpz_srcptr u, unsigned long int v_digit)
- {
- mp_ptr up;
- mp_size_t un;
- mp_limb_t ul;
- up = PTR(u);
- un = SIZ(u);
- if (un == 0)
- return -(v_digit != 0);
- if (un == 1)
- {
- ul = up[0];
- if (ul > v_digit)
- return 1;
- if (ul < v_digit)
- return -1;
- return 0;
- }
- #if GMP_NAIL_BITS != 0
- if (v_digit > GMP_NUMB_MAX)
- {
- if (un == 2)
- {
- ul = up[0] + (up[1] << GMP_NUMB_BITS);
- if ((up[1] >> GMP_NAIL_BITS) != 0)
- return 1;
- if (ul > v_digit)
- return 1;
- if (ul < v_digit)
- return -1;
- return 0;
- }
- }
- #endif
- return un > 0 ? 1 : -1;
- }