1 /* Test file for mpfr_mul_d
2
3 Copyright 2007-2023 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 #include <float.h>
24
25 #include "mpfr-test.h"
26
27 static void
check_nans(void)28 check_nans (void)
29 {
30 mpfr_t x, y;
31 int inexact;
32
33 mpfr_init2 (x, 123);
34 mpfr_init2 (y, 123);
35
36 /* nan * 1.0 is nan */
37 mpfr_set_nan (x);
38 mpfr_clear_flags();
39 inexact = mpfr_mul_d (y, x, 1.0, MPFR_RNDN);
40 MPFR_ASSERTN (inexact == 0);
41 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
42 MPFR_ASSERTN (mpfr_nan_p (y));
43
44 /* +inf * 1.0 == +inf */
45 mpfr_set_inf (x, 1);
46 mpfr_clear_flags();
47 inexact = mpfr_mul_d (y, x, 1.0, MPFR_RNDN);
48 MPFR_ASSERTN (inexact == 0);
49 MPFR_ASSERTN (__gmpfr_flags == 0);
50 MPFR_ASSERTN (mpfr_inf_p (y));
51 MPFR_ASSERTN (MPFR_IS_POS (y));
52
53 /* +inf * 0.0 is nan */
54 mpfr_clear_flags();
55 inexact = mpfr_mul_d (y, x, 0.0, MPFR_RNDN);
56 MPFR_ASSERTN (inexact == 0);
57 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
58 MPFR_ASSERTN (mpfr_nan_p (y));
59
60 /* -inf * 1.0 == -inf */
61 mpfr_set_inf (x, -1);
62 mpfr_clear_flags();
63 inexact = mpfr_mul_d (y, x, 1.0, MPFR_RNDN);
64 MPFR_ASSERTN (inexact == 0);
65 MPFR_ASSERTN (__gmpfr_flags == 0);
66 MPFR_ASSERTN (mpfr_inf_p (y));
67 MPFR_ASSERTN (MPFR_IS_NEG (y));
68
69 mpfr_clear (x);
70 mpfr_clear (y);
71 }
72
73 static void
bug20171218(void)74 bug20171218 (void)
75 {
76 mpfr_t a, b;
77 mpfr_init2 (a, 22);
78 mpfr_init2 (b, 1312);
79 mpfr_set_str (b, "1.ffffffffffffffffffc3e0007ffe000700fff8001fff800000000007e0fffe0007fffffff00001f800000003ffffffe1fc00000003fffe7c03ffffffffffffffe000000fffffffff83f0000007ffc03ffffffffc0007ff0000ffcfffffe00000f80000000003c007ffffffff3ff807ffffffffff000000000000001fc000fffe000600000ff0003ffe00fffffffc00001ffc0fffffffffff00000807fe03ffffffc01ffe", 16, MPFR_RNDN);
80 mpfr_mul_d (a, b, 0.5, MPFR_RNDF);
81 /* a should be 1 or nextbelow(1) */
82 if (mpfr_cmp_ui (a, 1) != 0)
83 {
84 mpfr_nextabove (a);
85 MPFR_ASSERTN(mpfr_cmp_ui (a, 1) == 0);
86 }
87 mpfr_clear (a);
88 mpfr_clear (b);
89 }
90
91 #define TEST_FUNCTION mpfr_mul_d
92 #define DOUBLE_ARG2
93 #define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS)
94 #include "tgeneric.c"
95
96 int
main(void)97 main (void)
98 {
99 mpfr_t x, y, z;
100 double d;
101 int inexact;
102
103 tests_start_mpfr ();
104
105 bug20171218 ();
106
107 /* check with enough precision */
108 mpfr_init2 (x, IEEE_DBL_MANT_DIG);
109 mpfr_init2 (y, IEEE_DBL_MANT_DIG);
110 mpfr_init2 (z, IEEE_DBL_MANT_DIG);
111
112 mpfr_set_str (y, "4096", 10, MPFR_RNDN);
113 d = 0.125;
114 mpfr_clear_flags ();
115 inexact = mpfr_mul_d (x, y, d, MPFR_RNDN);
116 if (inexact != 0)
117 {
118 printf ("Inexact flag error in mpfr_mul_d\n");
119 exit (1);
120 }
121 mpfr_set_str (z, "512", 10, MPFR_RNDN);
122 if (mpfr_cmp (z, x))
123 {
124 printf ("Error in mpfr_mul_d (");
125 mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN);
126 printf (" + %.20g)\nexpected ", d);
127 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN);
128 printf ("\ngot ");
129 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
130 printf ("\n");
131 exit (1);
132 }
133 mpfr_clears (x, y, z, (mpfr_ptr) 0);
134
135 check_nans ();
136
137 test_generic (MPFR_PREC_MIN, 1000, 100);
138
139 tests_end_mpfr ();
140 return 0;
141 }
142