1 /* tsgn -- Test for the sign of a floating point number.
2
3 Copyright 2003, 2006-2023 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_TESTS_TSGN 1
24 #include "mpfr-test.h"
25
26 static void
mpfr_sgn_test(mpfr_srcptr x,int res)27 mpfr_sgn_test (mpfr_srcptr x, int res)
28 {
29 mpfr_exp_t old_emin, old_emax, e;
30 mpfr_flags_t flags;
31 int i, v;
32
33 old_emin = mpfr_get_emin ();
34 old_emax = mpfr_get_emax ();
35
36 for (i = 0; i <= 1; i++)
37 {
38 if (i != 0)
39 {
40 e = MPFR_IS_SINGULAR (x) ? MPFR_EMIN_MIN : mpfr_get_exp (x);
41 set_emin (e);
42 set_emax (e);
43 }
44
45 for (flags = 0; flags <= MPFR_FLAGS_ALL; flags++)
46 {
47 __gmpfr_flags = flags;
48 v = (mpfr_sgn) (x);
49 MPFR_ASSERTN (__gmpfr_flags == flags);
50 if (VSIGN (v) != res)
51 {
52 printf ("mpfr_sgn function error (got %d) for ", v);
53 mpfr_dump (x);
54 exit (1);
55 }
56 v = mpfr_sgn (x);
57 MPFR_ASSERTN (__gmpfr_flags == flags);
58 if (VSIGN (v) != res)
59 {
60 printf ("mpfr_sgn macro error (got %d) for ", v);
61 mpfr_dump (x);
62 exit (1);
63 }
64 }
65 }
66
67 set_emin (old_emin);
68 set_emax (old_emax);
69 }
70
71 static void
check_special(void)72 check_special (void)
73 {
74 mpfr_t x;
75 int i;
76
77 mpfr_init (x);
78
79 for (i = 1; i >= -1; i -= 2)
80 {
81 mpfr_set_zero (x, i);
82 mpfr_sgn_test (x, 0);
83 mpfr_set_inf (x, i);
84 mpfr_sgn_test (x, i);
85 mpfr_set_si (x, i, MPFR_RNDN);
86 mpfr_sgn_test (x, i);
87 }
88
89 MPFR_SET_NAN (x);
90
91 mpfr_clear_flags ();
92 if ((mpfr_sgn) (x) != 0 || !mpfr_erangeflag_p ())
93 {
94 printf ("Sgn error for NaN.\n");
95 exit (1);
96 }
97
98 mpfr_clear_flags ();
99 if (mpfr_sgn (x) != 0 || !mpfr_erangeflag_p ())
100 {
101 printf ("Sgn error for NaN.\n");
102 exit (1);
103 }
104
105 mpfr_clear (x);
106 }
107
108 static void
check_sgn(void)109 check_sgn(void)
110 {
111 mpfr_t x;
112 int i, s1, s2;
113
114 mpfr_init(x);
115 for(i = 0 ; i < 100 ; i++)
116 {
117 mpfr_urandomb (x, RANDS);
118 if (i&1)
119 {
120 MPFR_SET_POS(x);
121 s2 = 1;
122 }
123 else
124 {
125 MPFR_SET_NEG(x);
126 s2 = -1;
127 }
128 s1 = mpfr_sgn(x);
129 if (s1 < -1 || s1 > 1)
130 {
131 printf("Error for sgn: out of range.\n");
132 goto lexit;
133 }
134 else if (MPFR_IS_NAN(x) || MPFR_IS_ZERO(x))
135 {
136 if (s1 != 0)
137 {
138 printf("Error for sgn: Nan or Zero should return 0.\n");
139 goto lexit;
140 }
141 }
142 else if (s1 != s2)
143 {
144 printf("Error for sgn. Return %d instead of %d.\n", s1, s2);
145 goto lexit;
146 }
147 }
148 mpfr_clear(x);
149 return;
150
151 lexit:
152 mpfr_clear(x);
153 exit(1);
154 }
155
156 int
main(int argc,char * argv[])157 main (int argc, char *argv[])
158 {
159 tests_start_mpfr ();
160
161 check_special ();
162 check_sgn ();
163
164 tests_end_mpfr ();
165 return 0;
166 }
167