1 /* tinternals -- Test for internals.
2
3 Copyright 2005-2023 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramba projects, INRIA.
5
6 This file is part of the GNU MPFR Library.
7
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
12
13 The GNU MPFR Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23 #define MPFR_NEED_LONGLONG_H
24 #include "mpfr-test.h"
25
26 static void
27 test_int_ceil_log2 (void)
28 {
29 int i;
30 int val[16] = { 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4 };
31
32 for (i = 1; i < 17; i++)
33 {
34 if (MPFR_INT_CEIL_LOG2 (i) != val[i-1])
35 {
36 printf ("Error 1 in test_int_ceil_log2 for i = %d\n", i);
37 exit (1);
38 }
39 if (MPFR_INT_CEIL_LOG2 (i) != __gmpfr_int_ceil_log2 (i))
40 {
41 printf ("Error 2 in test_int_ceil_log2 for i = %d\n", i);
42 exit (1);
43 }
44 }
45 }
46
47 static void
48 test_round_near_x (void)
49 {
50 mpfr_t x, y, z, eps;
51 mpfr_exp_t e;
52 int failures = 0, mx, neg, err, dir, r, inex, inex2;
53 char buffer[7], *p;
54
55 mpfr_inits (x, y, z, eps, (mpfr_ptr) 0);
56 mpfr_set_prec (x, 5);
57 mpfr_set_prec (y, 3);
58 mpfr_set_prec (z, 3);
59 mpfr_set_prec (eps, 2);
60 mpfr_set_ui_2exp (eps, 1, -32, MPFR_RNDN);
61
62 for (mx = 16; mx < 32; mx++)
63 {
64 mpfr_set_ui_2exp (x, mx, -2, MPFR_RNDN);
65 for (p = buffer, neg = 0;
66 neg <= 1;
67 mpfr_neg (x, x, MPFR_RNDN), p++, neg++)
68 for (err = 2; err <= 6; err++)
69 for (dir = 0; dir <= 1; dir++)
70 RND_LOOP_NO_RNDF (r)
71 {
72 inex = mpfr_round_near_x (y, x, err, dir, (mpfr_rnd_t) r);
73
74 if (inex == 0 && err < 6)
75 {
76 /* The test is more restrictive than necessary.
77 So, no failure in this case. */
78 continue;
79 }
80
81 inex2 = ((dir ^ neg) ? mpfr_add : mpfr_sub)
82 (z, x, eps, (mpfr_rnd_t) r);
83 if (inex * inex2 <= 0)
84 printf ("Bad return value (%d instead of %d) for:\n",
85 inex, inex2);
86 else if (mpfr_equal_p (y, z))
87 continue; /* correct inex and y */
88 else
89 {
90 printf ("Bad MPFR value (should have got ");
91 mpfr_out_str (stdout, 2, 3, z, MPFR_RNDZ);
92 printf (") for:\n");
93 }
94
95 if (!mpfr_get_str (buffer, &e, 2, 5, x, MPFR_RNDZ) || e != 3)
96 {
97 printf ("mpfr_get_str failed in test_round_near_x\n");
98 exit (1);
99 }
100 printf ("x = %c%c%c%c.%c%c, ", neg ? '-' : '+',
101 p[0], p[1], p[2], p[3], p[4]);
102 printf ("err = %d, dir = %d, r = %s --> inex = %2d",
103 err, dir, mpfr_print_rnd_mode ((mpfr_rnd_t) r), inex);
104 if (inex != 0)
105 {
106 printf (", y = ");
107 mpfr_out_str (stdout, 2, 3, y, MPFR_RNDZ);
108 }
109 printf ("\n");
110 if (inex == 0)
111 printf ("Rounding was possible!\n");
112 if (++failures == 10) /* show at most 10 failures */
113 exit (1);
114 }
115 }
116
117 if (failures)
118 exit (1);
119
120 mpfr_clears (x, y, z, eps, (mpfr_ptr) 0);
121 }
122
123 static void
124 test_set_prec_raw (void)
125 {
126 mpfr_t x;
127 int i;
128
129 mpfr_init2 (x, 53);
130 for (i = 2; i < 11; i++)
131 {
132 mpfr_set_prec_raw (x, i);
133 if (MPFR_PREC (x) != i)
134 {
135 printf ("[ERROR]: mpfr_set_prec_raw %d\n", i);
136 exit (1);
137 }
138 }
139 mpfr_clear (x);
140 }
141
142 int
143 main (int argc, char **argv)
144 {
145 tests_start_mpfr ();
146
147 test_int_ceil_log2 ();
148
149 test_round_near_x ();
150 test_set_prec_raw ();
151
152 tests_end_mpfr ();
153 return 0;
154 }