cmp_si.c
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上传日期:2022-08-06
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- /* mpz_cmp_si(u,v) -- Compare an integer U with a single-word int V.
- Return positive, zero, or negative based on if U > V, U == V, or U < V.
- Copyright 1991, 1993, 1994, 1995, 1996, 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
- _mpz_cmp_si (mpz_srcptr u, signed long int v_digit)
- {
- mp_size_t usize = u->_mp_size;
- mp_size_t vsize;
- mp_limb_t u_digit;
- #if GMP_NAIL_BITS != 0
- /* FIXME. This isn't very pretty. */
- mpz_t tmp;
- mp_limb_t tt[2];
- PTR(tmp) = tt;
- ALLOC(tmp) = 2;
- mpz_set_si (tmp, v_digit);
- return mpz_cmp (u, tmp);
- #endif
- vsize = 0;
- if (v_digit > 0)
- vsize = 1;
- else if (v_digit < 0)
- {
- vsize = -1;
- v_digit = -v_digit;
- }
- if (usize != vsize)
- return usize - vsize;
- if (usize == 0)
- return 0;
- u_digit = u->_mp_d[0];
- if (u_digit == (mp_limb_t) (unsigned long) v_digit)
- return 0;
- if (u_digit > (mp_limb_t) (unsigned long) v_digit)
- return usize;
- else
- return -usize;
- }