1 /* $OpenBSD: fmaxmin_test.c,v 1.2 2021/12/13 18:04:28 deraadt Exp $ */
2 /*-
3 * Copyright (c) 2008 David Schultz <das@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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 copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include "macros.h"
29
30 /*
31 * Tests for fmax{,f,l}() and fmin{,f,l}.
32 */
33
34 #include <fenv.h>
35 #include <float.h>
36 #include <math.h>
37 #include <stdio.h>
38
39 #include "test-utils.h"
40
41 #pragma STDC FENV_ACCESS ON
42
43 /*
44 * Test whether func(x, y) has the expected result, and make sure no
45 * exceptions are raised.
46 */
47 #define TEST(func, type, x, y, expected, rmode) do { \
48 type __x = (x); /* convert before we clear exceptions */ \
49 type __y = (y); \
50 ATF_REQUIRE_EQ(0, feclearexcept(ALL_STD_EXCEPT)); \
51 long double __result = func((__x), (__y)); \
52 CHECK_FP_EXCEPTIONS_MSG(0, ALL_STD_EXCEPT, \
53 #func "(%.20Lg, %.20Lg) rmode%d", (x), (y), rmode); \
54 ATF_CHECK_MSG(fpequal_cs(__result, (expected), true), \
55 #func "(%.20Lg, %.20Lg) rmode%d = %.20Lg, expected %.20Lg\n", \
56 (x), (y), rmode, __result, (expected)); \
57 } while (0)
58
59 static void
testall_r(long double big,long double small,int rmode)60 testall_r(long double big, long double small, int rmode)
61 {
62 long double expected_max = isnan(big) ? small : big;
63 long double expected_min = isnan(small) ? big : small;
64 TEST(fmaxf, float, big, small, expected_max, rmode);
65 TEST(fmaxf, float, small, big, expected_max, rmode);
66 TEST(fmax, double, big, small, expected_max, rmode);
67 TEST(fmax, double, small, big, expected_max, rmode);
68 TEST(fmaxl, long double, big, small, expected_max, rmode);
69 TEST(fmaxl, long double, small, big, expected_max, rmode);
70 TEST(fminf, float, big, small, expected_min, rmode);
71 TEST(fminf, float, small, big, expected_min, rmode);
72 TEST(fmin, double, big, small, expected_min, rmode);
73 TEST(fmin, double, small, big, expected_min, rmode);
74 TEST(fminl, long double, big, small, expected_min, rmode);
75 TEST(fminl, long double, small, big, expected_min, rmode);
76 }
77
78 /*
79 * Test all the functions: fmaxf, fmax, fmaxl, fminf, fmin, and fminl,
80 * in all rounding modes and with the arguments in different orders.
81 * The input 'big' must be >= 'small'.
82 */
83 static void
testall(long double big,long double small)84 testall(long double big, long double small)
85 {
86 static const int rmodes[] = {
87 FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
88 };
89 int i;
90
91 for (i = 0; i < 4; i++) {
92 fesetround(rmodes[i]);
93 testall_r(big, small, rmodes[i]);
94 }
95 }
96
97 ATF_TC_WITHOUT_HEAD(test1);
ATF_TC_BODY(test1,tc)98 ATF_TC_BODY(test1, tc)
99 {
100 testall(1.0, 0.0);
101 }
102
103 ATF_TC_WITHOUT_HEAD(test2);
ATF_TC_BODY(test2,tc)104 ATF_TC_BODY(test2, tc)
105 {
106 testall(42.0, nextafterf(42.0, -INFINITY));
107 }
108 ATF_TC_WITHOUT_HEAD(test3);
ATF_TC_BODY(test3,tc)109 ATF_TC_BODY(test3, tc)
110 {
111 testall(nextafterf(42.0, INFINITY), 42.0);
112 }
113
114 ATF_TC_WITHOUT_HEAD(test4);
ATF_TC_BODY(test4,tc)115 ATF_TC_BODY(test4, tc)
116 {
117 testall(-5.0, -5.0);
118 }
119
120 ATF_TC_WITHOUT_HEAD(test5);
ATF_TC_BODY(test5,tc)121 ATF_TC_BODY(test5, tc)
122 {
123 testall(-3.0, -4.0);
124 }
125
126 ATF_TC_WITHOUT_HEAD(test6);
ATF_TC_BODY(test6,tc)127 ATF_TC_BODY(test6, tc)
128 {
129 testall(1.0, NAN);
130 }
131 ATF_TC_WITHOUT_HEAD(test7);
ATF_TC_BODY(test7,tc)132 ATF_TC_BODY(test7, tc)
133 {
134 testall(INFINITY, NAN);
135 }
136
137 ATF_TC_WITHOUT_HEAD(test8);
ATF_TC_BODY(test8,tc)138 ATF_TC_BODY(test8, tc)
139 {
140 testall(INFINITY, 1.0);
141 }
142
143 ATF_TC_WITHOUT_HEAD(test9);
ATF_TC_BODY(test9,tc)144 ATF_TC_BODY(test9, tc)
145 {
146 testall(-3.0, -INFINITY);
147 }
148
149 ATF_TC_WITHOUT_HEAD(test10);
ATF_TC_BODY(test10,tc)150 ATF_TC_BODY(test10, tc)
151 {
152 testall(3.0, -INFINITY);
153 }
154
155 ATF_TC_WITHOUT_HEAD(test11);
ATF_TC_BODY(test11,tc)156 ATF_TC_BODY(test11, tc)
157 {
158 testall(NAN, NAN);
159 }
160
161 ATF_TC_WITHOUT_HEAD(test12);
ATF_TC_BODY(test12,tc)162 ATF_TC_BODY(test12, tc)
163 {
164 /* This test isn't strictly required to work by C99. */
165 testall(0.0, -0.0);
166 }
167
168
ATF_TP_ADD_TCS(tp)169 ATF_TP_ADD_TCS(tp)
170 {
171 ATF_TP_ADD_TC(tp, test1);
172 ATF_TP_ADD_TC(tp, test2);
173 ATF_TP_ADD_TC(tp, test3);
174 ATF_TP_ADD_TC(tp, test4);
175 ATF_TP_ADD_TC(tp, test5);
176 ATF_TP_ADD_TC(tp, test6);
177 ATF_TP_ADD_TC(tp, test7);
178 ATF_TP_ADD_TC(tp, test8);
179 ATF_TP_ADD_TC(tp, test9);
180 ATF_TP_ADD_TC(tp, test10);
181 ATF_TP_ADD_TC(tp, test11);
182 ATF_TP_ADD_TC(tp, test12);
183
184 return (atf_no_error());
185 }
186