fp80_cvtf.c revision 9888 
1/*
2 * Copyright (c) 2013, Andreas Sandberg
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above
12 *    copyright notice, this list of conditions and the following
13 *    disclaimer in the documentation and/or other materials provided
14 *    with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <fputils/fp80.h>
31
32#include "test_helper.h"
33
34#include <assert.h>
35#include <math.h>
36#include <stdio.h>
37#include <stdlib.h>
38
39static void
40test_cvtf(const char *name, double fin)
41{
42    fp80_t v80 = fp80_cvfd(fin);
43    double v64 = fp80_cvtd(v80);
44
45    test_diag("Conversion '%e' -> fp80 -> double: %e", fin, v64);
46
47    printf("# ");
48    fp80_debug_dump(stdout, v80);
49    if (v64 == fin ||
50        (isnan(fin) && isnan(v64) && signbit(fin) == signbit(v64))) {
51        test_ok(name);
52    } else {
53        test_diag("MISMATCH: %e != %e", fin, v64);
54        test_fail(name);
55    }
56}
57
58static void
59test_cvtf_exp(const char *name, double x, int exp)
60{
61    double val = ldexp(x, exp);
62    test_cvtf(name, val);
63}
64
65int
66main(int argc, char *argv[])
67{
68    test_init(9);
69
70    test_cvtf("+inf", -INFINITY);
71    test_cvtf("-inf", INFINITY);
72    test_cvtf("+nan", NAN);
73    test_cvtf("-nan", -NAN);
74    test_cvtf("+0", 0);
75    test_cvtf("PI", M_PI);
76
77    test_cvtf_exp("smallest normal", 1.0, -1022);
78    test_cvtf_exp("denormal1", 0.5, -1022);
79    test_cvtf_exp("denormal2", 0.25, -1022);
80
81    test_exit();
82}
83