1 /* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_tdiv_qr, mpz_tdiv_q,
2 mpz_tdiv_r, mpz_mul.
3
4 Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
5
6 This file is part of the GNU MP Library test suite.
7
8 The GNU MP Library test suite is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 3 of the License,
11 or (at your option) any later version.
12
13 The GNU MP Library test suite is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
16 Public License for more details.
17
18 You should have received a copy of the GNU General Public License along with
19 the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23
24 #include "gmp.h"
25 #include "gmp-impl.h"
26 #include "tests.h"
27
28 void dump_abort (mpz_t, mpz_t);
29 void debug_mp (mpz_t, int);
30
31 int
main(int argc,char ** argv)32 main (int argc, char **argv)
33 {
34 mpz_t dividend, divisor;
35 mpz_t quotient, remainder;
36 mpz_t quotient2, remainder2;
37 mpz_t temp;
38 mp_size_t dividend_size, divisor_size;
39 int i;
40 int reps = 1000;
41 gmp_randstate_ptr rands;
42 mpz_t bs;
43 unsigned long bsi, size_range;
44
45 tests_start ();
46 TESTS_REPS (reps, argv, argc);
47
48 rands = RANDS;
49
50 mpz_init (bs);
51
52 mpz_init (dividend);
53 mpz_init (divisor);
54 mpz_init (quotient);
55 mpz_init (remainder);
56 mpz_init (quotient2);
57 mpz_init (remainder2);
58 mpz_init (temp);
59
60 for (i = 0; i < reps; i++)
61 {
62 mpz_urandomb (bs, rands, 32);
63 size_range = mpz_get_ui (bs) % 18 + 2; /* 0..524288 bit operands */
64
65 do
66 {
67 mpz_urandomb (bs, rands, size_range);
68 divisor_size = mpz_get_ui (bs);
69 mpz_rrandomb (divisor, rands, divisor_size);
70 }
71 while (mpz_sgn (divisor) == 0);
72
73 mpz_urandomb (bs, rands, size_range);
74 dividend_size = mpz_get_ui (bs) + divisor_size;
75 mpz_rrandomb (dividend, rands, dividend_size);
76
77 mpz_urandomb (bs, rands, 2);
78 bsi = mpz_get_ui (bs);
79 if ((bsi & 1) != 0)
80 mpz_neg (dividend, dividend);
81 if ((bsi & 2) != 0)
82 mpz_neg (divisor, divisor);
83
84 /* printf ("%ld %ld\n", SIZ (dividend), SIZ (divisor)); */
85
86 mpz_tdiv_qr (quotient, remainder, dividend, divisor);
87 mpz_tdiv_q (quotient2, dividend, divisor);
88 mpz_tdiv_r (remainder2, dividend, divisor);
89
90 /* First determine that the quotients and remainders computed
91 with different functions are equal. */
92 if (mpz_cmp (quotient, quotient2) != 0)
93 dump_abort (dividend, divisor);
94 if (mpz_cmp (remainder, remainder2) != 0)
95 dump_abort (dividend, divisor);
96
97 /* Check if the sign of the quotient is correct. */
98 if (mpz_cmp_ui (quotient, 0) != 0)
99 if ((mpz_cmp_ui (quotient, 0) < 0)
100 != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0))
101 dump_abort (dividend, divisor);
102
103 /* Check if the remainder has the same sign as the dividend
104 (quotient rounded towards 0). */
105 if (mpz_cmp_ui (remainder, 0) != 0)
106 if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (dividend, 0) < 0))
107 dump_abort (dividend, divisor);
108
109 mpz_mul (temp, quotient, divisor);
110 mpz_add (temp, temp, remainder);
111 if (mpz_cmp (temp, dividend) != 0)
112 dump_abort (dividend, divisor);
113
114 mpz_abs (temp, divisor);
115 mpz_abs (remainder, remainder);
116 if (mpz_cmp (remainder, temp) >= 0)
117 dump_abort (dividend, divisor);
118 }
119
120 mpz_clear (bs);
121 mpz_clear (dividend);
122 mpz_clear (divisor);
123 mpz_clear (quotient);
124 mpz_clear (remainder);
125 mpz_clear (quotient2);
126 mpz_clear (remainder2);
127 mpz_clear (temp);
128
129 tests_end ();
130 exit (0);
131 }
132
133 void
dump_abort(mpz_t dividend,mpz_t divisor)134 dump_abort (mpz_t dividend, mpz_t divisor)
135 {
136 fprintf (stderr, "ERROR\n");
137 fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
138 fprintf (stderr, "divisor = "); debug_mp (divisor, -16);
139 abort();
140 }
141
142 void
debug_mp(mpz_t x,int base)143 debug_mp (mpz_t x, int base)
144 {
145 mpz_out_str (stderr, base, x); fputc ('\n', stderr);
146 }
147