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
my_mpz_mul(mpz_t r,mpz_srcptr a,mpz_srcptr b)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
testmain(int argc,char ** argv)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