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      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 }
    112