1  /* mpz_cmp_si(u,v) -- Compare an integer U with a single-word int V.
       2     Return positive, zero, or negative based on if U > V, U == V, or U < V.
       3  
       4  Copyright 1991, 1993-1996, 2000-2002, 2012, 2013 Free Software Foundation, Inc.
       5  
       6  This file is part of the GNU MP Library.
       7  
       8  The GNU MP Library is free software; you can redistribute it and/or modify
       9  it under the terms of either:
      10  
      11    * the GNU Lesser General Public License as published by the Free
      12      Software Foundation; either version 3 of the License, or (at your
      13      option) any later version.
      14  
      15  or
      16  
      17    * the GNU General Public License as published by the Free Software
      18      Foundation; either version 2 of the License, or (at your option) any
      19      later version.
      20  
      21  or both in parallel, as here.
      22  
      23  The GNU MP Library is distributed in the hope that it will be useful, but
      24  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      25  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      26  for more details.
      27  
      28  You should have received copies of the GNU General Public License and the
      29  GNU Lesser General Public License along with the GNU MP Library.  If not,
      30  see https://www.gnu.org/licenses/.  */
      31  
      32  #include "gmp-impl.h"
      33  
      34  int
      35  _mpz_cmp_si (mpz_srcptr u, signed long int v_digit) __GMP_NOTHROW
      36  {
      37  #if GMP_NAIL_BITS != 0
      38    /* FIXME.  This isn't very pretty.  */
      39    mpz_t tmp;
      40    mp_limb_t tt[2];
      41    PTR(tmp) = tt;
      42    ALLOC(tmp) = 2;
      43    mpz_set_si (tmp, v_digit);
      44    return mpz_cmp (u, tmp);
      45  #else
      46  
      47    mp_size_t vsize, usize;
      48  
      49    usize = SIZ (u);
      50    vsize = (v_digit > 0) - (v_digit < 0);
      51  
      52    if ((usize == 0) | (usize != vsize))
      53      return usize - vsize;
      54    else {
      55      mp_limb_t u_digit, absv_digit;
      56  
      57      u_digit = PTR (u)[0];
      58      absv_digit = ABS_CAST (unsigned long, v_digit);
      59  
      60      if (u_digit == absv_digit)
      61        return 0;
      62  
      63      if (u_digit > absv_digit)
      64        return usize;
      65      else
      66        return -usize;
      67    }
      68  #endif
      69  }