1 /* test mpz_divisible_p and mpz_divisible_ui_p
2
3 Copyright 2001, 2009 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 <stdio.h>
21 #include <stdlib.h>
22
23 #include "gmp-impl.h"
24 #include "tests.h"
25
26
27 void
28 check_one (mpz_srcptr a, mpz_srcptr d, int want)
29 {
30 int got;
31
32 if (mpz_fits_ulong_p (d))
33 {
34 unsigned long u = mpz_get_ui (d);
35 got = (mpz_divisible_ui_p (a, u) != 0);
36 if (want != got)
37 {
38 printf ("mpz_divisible_ui_p wrong\n");
39 printf (" expected %d got %d\n", want, got);
40 mpz_trace (" a", a);
41 printf (" d=%lu\n", u);
42 mp_trace_base = -16;
43 mpz_trace (" a", a);
44 printf (" d=0x%lX\n", u);
45 abort ();
46 }
47 }
48
49 got = (mpz_divisible_p (a, d) != 0);
50 if (want != got)
51 {
52 printf ("mpz_divisible_p wrong\n");
53 printf (" expected %d got %d\n", want, got);
54 mpz_trace (" a", a);
55 mpz_trace (" d", d);
56 mp_trace_base = -16;
57 mpz_trace (" a", a);
58 mpz_trace (" d", d);
59 abort ();
60 }
61 }
62
63 void
64 check_data (void)
65 {
66 static const struct {
67 const char *a;
68 const char *d;
69 int want;
70
71 } data[] = {
72
73 { "0", "0", 1 },
74 { "17", "0", 0 },
75 { "0", "1", 1 },
76 { "123", "1", 1 },
77 { "-123", "1", 1 },
78
79 { "0", "2", 1 },
80 { "1", "2", 0 },
81 { "2", "2", 1 },
82 { "-2", "2", 1 },
83 { "0x100000000000000000000000000000000", "2", 1 },
84 { "0x100000000000000000000000000000001", "2", 0 },
85
86 { "0x3333333333333333", "3", 1 },
87 { "0x3333333333333332", "3", 0 },
88 { "0x33333333333333333333333333333333", "3", 1 },
89 { "0x33333333333333333333333333333332", "3", 0 },
90
91 /* divisor changes from 2 to 1 limb after stripping 2s */
92 { "0x3333333300000000", "0x180000000", 1 },
93 { "0x33333333333333330000000000000000", "0x18000000000000000", 1 },
94 { "0x133333333333333330000000000000000", "0x18000000000000000", 0 },
95 };
96
97 mpz_t a, d;
98 int i;
99
100 mpz_init (a);
101 mpz_init (d);
102
103 for (i = 0; i < numberof (data); i++)
104 {
105 mpz_set_str_or_abort (a, data[i].a, 0);
106 mpz_set_str_or_abort (d, data[i].d, 0);
107 check_one (a, d, data[i].want);
108 }
109
110 mpz_clear (a);
111 mpz_clear (d);
112 }
113
114 void
115 check_random (int reps)
116 {
117 gmp_randstate_ptr rands = RANDS;
118 mpz_t a, d, r;
119 int i;
120 int want;
121
122 mpz_init (a);
123 mpz_init (d);
124 mpz_init (r);
125
126 for (i = 0; i < reps; i++)
127 {
128 mpz_erandomb (a, rands, 1 << 19);
129 mpz_erandomb_nonzero (d, rands, 1 << 18);
130
131 mpz_fdiv_r (r, a, d);
132
133 want = (mpz_sgn (r) == 0);
134 check_one (a, d, want);
135
136 mpz_sub (a, a, r);
137 check_one (a, d, 1);
138
139 if (mpz_cmpabs_ui (d, 1L) == 0)
140 continue;
141
142 mpz_add_ui (a, a, 1L);
143 check_one (a, d, 0);
144 }
145
146 mpz_clear (a);
147 mpz_clear (d);
148 mpz_clear (r);
149 }
150
151
152 int
153 main (int argc, char *argv[])
154 {
155 int reps = 100;
156
157 tests_start ();
158
159 TESTS_REPS (reps, argv, argc);
160
161 check_data ();
162 check_random (reps);
163
164 tests_end ();
165 exit (0);
166 }