1  /*
       2  
       3  Copyright 2012, 2014, 2016, Free Software Foundation, Inc.
       4  
       5  This file is part of the GNU MP Library test suite.
       6  
       7  The GNU MP Library test suite is free software; you can redistribute it
       8  and/or modify it under the terms of the GNU General Public License as
       9  published by the Free Software Foundation; either version 3 of the License,
      10  or (at your option) any later version.
      11  
      12  The GNU MP Library test suite is distributed in the hope that it will be
      13  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
      14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
      15  Public License for more details.
      16  
      17  You should have received a copy of the GNU General Public License along with
      18  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
      19  
      20  #include <assert.h>
      21  #include <limits.h>
      22  #include <stdlib.h>
      23  #include <stdio.h>
      24  #include <string.h>
      25  
      26  #include "testutils.h"
      27  
      28  #define MAXBITS 400
      29  #define COUNT 100
      30  
      31  void
      32  my_mpz_mul (mpz_t r, mpz_srcptr a,  mpz_srcptr b)
      33  {
      34    mp_limb_t *tp;
      35    mp_size_t tn, an, bn;
      36  
      37    an = mpz_size (a);
      38    bn = mpz_size (b);
      39  
      40    assert (an > 0);
      41    assert (bn > 0);
      42  
      43    tn = an + bn;
      44    tp = mpz_limbs_write (r, tn);
      45    if (an > bn)
      46      mpn_mul (tp, mpz_limbs_read (a), an, mpz_limbs_read (b), bn);
      47    else
      48      mpn_mul (tp, mpz_limbs_read (b), bn, mpz_limbs_read (a), an);
      49  
      50    if (mpz_sgn (a) != mpz_sgn(b))
      51      tn = - tn;
      52  
      53    mpz_limbs_finish (r, tn);
      54  }
      55  
      56  void
      57  testmain (int argc, char **argv)
      58  {
      59    unsigned i;
      60    mpz_t a, b, res, ref;
      61  
      62    mpz_init (a);
      63    mpz_init (b);
      64    mpz_init (res);
      65    mpz_init (ref);
      66  
      67    for (i = 0; i < COUNT; i++)
      68      {
      69        mini_random_op3 (OP_MUL, MAXBITS, a, b, ref);
      70        if (mpz_sgn(ref) == 0)
      71  	/* my_mpz_mul requires a != 0, b != 0 */
      72  	continue;
      73        my_mpz_mul (res, a, b);
      74        if (mpz_cmp (res, ref))
      75  	{
      76  	  fprintf (stderr, "my_mpz_mul failed:\n");
      77  	  dump ("a", a);
      78  	  dump ("b", b);
      79  	  dump ("r", res);
      80  	  dump ("ref", ref);
      81  	  abort ();
      82  	}
      83        /* The following test exploits a side-effect of my_mpz_mul: res
      84  	 points to a buffer with at least an+bn limbs, and the limbs
      85  	 above the result are zeroed. */
      86        if (mpz_size (b) > 0 && mpz_getlimbn (res, mpz_size(a)) != mpz_limbs_read (res) [mpz_size(a)])
      87  	{
      88  	  fprintf (stderr, "getlimbn - limbs_read differ.\n");
      89  	  abort ();
      90  	}
      91        if ((i % 4 == 0) && mpz_size (res) > 1)
      92  	{
      93  	  mpz_realloc2 (res, 1);
      94  	  if (mpz_cmp_ui (res, 0))
      95  	    {
      96  	      fprintf (stderr, "mpz_realloc2 did not clear res.\n");
      97  	      abort ();
      98  	    }
      99  	  mpz_limbs_finish (ref, 0);
     100  	  if (mpz_cmp_d (ref, 0))
     101  	    {
     102  	      fprintf (stderr, "mpz_limbs_finish did not clear res.\n");
     103  	      abort ();
     104  	    }
     105  	}
     106      }
     107    mpz_clear (a);
     108    mpz_clear (b);
     109    mpz_clear (res);
     110    mpz_clear (ref);
     111  }