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-impl.h"
25 #include "tests.h"
26
27 void dump_abort (mpz_t, mpz_t);
28 void debug_mp (mpz_t, int);
29
30 int
main(int argc,char ** argv)31 main (int argc, char **argv)
32 {
33 mpz_t dividend, divisor;
34 mpz_t quotient, remainder;
35 mpz_t quotient2, remainder2;
36 mpz_t temp;
37 mp_size_t dividend_size, divisor_size;
38 int i;
39 int reps = 1000;
40 gmp_randstate_ptr rands;
41 mpz_t bs;
42 unsigned long bsi, size_range;
43
44 tests_start ();
45 TESTS_REPS (reps, argv, argc);
46
47 rands = RANDS;
48
49 mpz_init (bs);
50
51 mpz_init (dividend);
52 mpz_init (divisor);
53 mpz_init (quotient);
54 mpz_init (remainder);
55 mpz_init (quotient2);
56 mpz_init (remainder2);
57 mpz_init (temp);
58
59 for (i = 0; i < reps; i++)
60 {
61 mpz_urandomb (bs, rands, 32);
62 size_range = mpz_get_ui (bs) % 18 + 2; /* 0..524288 bit operands */
63
64 do
65 {
66 mpz_urandomb (bs, rands, size_range);
67 divisor_size = mpz_get_ui (bs);
68 mpz_rrandomb (divisor, rands, divisor_size);
69 }
70 while (mpz_sgn (divisor) == 0);
71
72 mpz_urandomb (bs, rands, size_range);
73 dividend_size = mpz_get_ui (bs) + divisor_size;
74 mpz_rrandomb (dividend, rands, dividend_size);
75
76 mpz_urandomb (bs, rands, 2);
77 bsi = mpz_get_ui (bs);
78 if ((bsi & 1) != 0)
79 mpz_neg (dividend, dividend);
80 if ((bsi & 2) != 0)
81 mpz_neg (divisor, divisor);
82
83 /* printf ("%ld %ld\n", SIZ (dividend), SIZ (divisor)); */
84
85 mpz_tdiv_qr (quotient, remainder, dividend, divisor);
86 mpz_tdiv_q (quotient2, dividend, divisor);
87 mpz_tdiv_r (remainder2, dividend, divisor);
88
89 /* First determine that the quotients and remainders computed
90 with different functions are equal. */
91 if (mpz_cmp (quotient, quotient2) != 0)
92 dump_abort (dividend, divisor);
93 if (mpz_cmp (remainder, remainder2) != 0)
94 dump_abort (dividend, divisor);
95
96 /* Check if the sign of the quotient is correct. */
97 if (mpz_cmp_ui (quotient, 0) != 0)
98 if ((mpz_cmp_ui (quotient, 0) < 0)
99 != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0))
100 dump_abort (dividend, divisor);
101
102 /* Check if the remainder has the same sign as the dividend
103 (quotient rounded towards 0). */
104 if (mpz_cmp_ui (remainder, 0) != 0)
105 if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (dividend, 0) < 0))
106 dump_abort (dividend, divisor);
107
108 mpz_mul (temp, quotient, divisor);
109 mpz_add (temp, temp, remainder);
110 if (mpz_cmp (temp, dividend) != 0)
111 dump_abort (dividend, divisor);
112
113 mpz_abs (temp, divisor);
114 mpz_abs (remainder, remainder);
115 if (mpz_cmp (remainder, temp) >= 0)
116 dump_abort (dividend, divisor);
117 }
118
119 mpz_clear (bs);
120 mpz_clear (dividend);
121 mpz_clear (divisor);
122 mpz_clear (quotient);
123 mpz_clear (remainder);
124 mpz_clear (quotient2);
125 mpz_clear (remainder2);
126 mpz_clear (temp);
127
128 tests_end ();
129 exit (0);
130 }
131
132 void
dump_abort(mpz_t dividend,mpz_t divisor)133 dump_abort (mpz_t dividend, mpz_t divisor)
134 {
135 fprintf (stderr, "ERROR\n");
136 fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
137 fprintf (stderr, "divisor = "); debug_mp (divisor, -16);
138 abort();
139 }
140
141 void
debug_mp(mpz_t x,int base)142 debug_mp (mpz_t x, int base)
143 {
144 mpz_out_str (stderr, base, x); fputc ('\n', stderr);
145 }
146