fp80_cvfd.c revision 9888:68d6b600d51f 
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_cvfd_class(const char *name, double fin)
41{
42    test_diag("converting '%e' -> fp80...", fin);
43    fp80_t v = fp80_cvfd(fin);
44    int class_ok;
45    int fp64_class = fpclassify(fin);
46    int class = fp64_class == FP_SUBNORMAL ? FP_NORMAL : fp64_class;
47    int fp80_class = fp80_classify(v);
48
49    printf("# ");
50    fp80_debug_dump(stdout, v);
51    test_diag("isnan: %i, isinf: %i, iszero: %i, isnormal: %i, issubnormal: %i",
52              fp80_isnan(v), fp80_isinf(v), fp80_iszero(v),
53              fp80_isnormal(v), fp80_issubnormal(v));
54    test_diag("class(fp64): %i, expected class: %i, class(fp80): %i",
55              fp64_class, class, fp80_classify(v));
56    switch (class) {
57    case FP_NAN:
58        class_ok = fp80_isnan(v) && !fp80_isinf(v) && !fp80_iszero(v) &&
59            !fp80_isnormal(v) && !fp80_issubnormal(v);
60        break;
61
62    case FP_INFINITE:
63        class_ok = !fp80_isnan(v) && fp80_isinf(v) && !fp80_iszero(v) &&
64            !fp80_isnormal(v) && !fp80_issubnormal(v);
65        break;
66    case FP_ZERO:
67        class_ok = !fp80_isnan(v) && !fp80_isinf(v) && fp80_iszero(v) &&
68            !fp80_isnormal(v) && !fp80_issubnormal(v);
69        break;
70
71    case FP_SUBNORMAL:
72        class_ok = !fp80_isnan(v) && !fp80_isinf(v) && !fp80_iszero(v) &&
73            !fp80_isnormal(v) && fp80_issubnormal(v);
74        break;
75
76    case FP_NORMAL:
77        class_ok = !fp80_isnan(v) && !fp80_isinf(v) && !fp80_iszero(v) &&
78            fp80_isnormal(v) && !fp80_issubnormal(v);
79        break;
80
81    default:
82        test_bail("unexpected FP class (%i)", class);
83    }
84
85    if (!class_ok) {
86        test_diag("inconsistent classification");
87        test_fail(name);
88    } else if (fp80_class != class) {
89        test_diag("class mismatch");
90        test_fail(name);
91    } else {
92        test_ok(name);
93    }
94}
95
96static void
97test_cvfd_class_exp(const char *name, double x, int exp)
98{
99    double val = ldexp(x, exp);
100    test_cvfd_class(name, val);
101}
102
103int
104main(int argc, char *argv[])
105{
106    test_init(9);
107
108    test_cvfd_class("double->fp80 +inf", -INFINITY);
109    test_cvfd_class("double->fp80 -inf", INFINITY);
110    test_cvfd_class("double->fp80 +nan", NAN);
111    test_cvfd_class("double->fp80 -nan", -NAN);
112    test_cvfd_class("double->fp80 +0", 0);
113    test_cvfd_class("double->fp80 PI", M_PI);
114
115    test_cvfd_class_exp("double->fp80 smallest normal", 1.0, -1022);
116    test_cvfd_class_exp("double->fp80 denormal1", 0.5, -1022);
117    test_cvfd_class_exp("double->fp80 denormal2", 0.25, -1022);
118
119    test_exit();
120}
121