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Import gmp 2.0.2

/* 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 (C) 1991, 1993, 1994, 1995 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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.

You should have received a copy of the GNU Library General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#include "gmp.h"
#include "gmp-impl.h"

/* gmp.h defines a macro for mpz_cmp_si.  */
#undef mpz_cmp_si

int
#if __STDC__
mpz_cmp_si (mpz_srcptr u, signed long int v_digit)
#else
mpz_cmp_si (u, v_digit)
     mpz_srcptr u;
     signed long int v_digit;
#endif
{
  mp_size_t usize = u->_mp_size;
  mp_size_t vsize;
  mp_limb_t u_digit;

  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 == v_digit)
    return 0;

  if (u_digit > v_digit)
    return usize;
  else
    return -usize;
}