1 /*-
2 * Copyright (c) 2008 David Schultz <das@FreeBSD.org>
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 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 /*
28 * Tests for fmax{,f,l}() and fmin{,f,l}.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: stable/9/tools/regression/lib/msun/test-fmaxmin.c 216222 2010-12-06 00:02:49Z das $");
33
34 #include <fenv.h>
35 #include <float.h>
36 #include <math.h>
37 #include <stdio.h>
38
39 #define ALL_STD_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
40 FE_OVERFLOW | FE_UNDERFLOW)
41
42 #pragma STDC FENV_ACCESS ON
43
44 /*
45 * Test for equality with two special rules:
46 * fpequal(NaN, NaN) is true
47 * fpequal(+0.0, -0.0) is false
48 */
49 static inline int
fpequal(long double x,long double y)50 fpequal(long double x, long double y)
51 {
52
53 return ((x == y && !signbit(x) == !signbit(y))
54 || (isnan(x) && isnan(y)));
55 }
56
57 /*
58 * Test whether func(x, y) has the expected result, and make sure no
59 * exceptions are raised.
60 */
61 #define TEST(func, type, x, y, expected) do { \
62 type __x = (x); /* convert before we clear exceptions */ \
63 type __y = (y); \
64 feclearexcept(ALL_STD_EXCEPT); \
65 long double __result = func((__x), (__y)); \
66 if (fetestexcept(ALL_STD_EXCEPT)) { \
67 fprintf(stderr, #func "(%.20Lg, %.20Lg) raised 0x%x\n", \
68 (x), (y), fetestexcept(FE_ALL_EXCEPT)); \
69 ok = 0; \
70 } \
71 if (!fpequal(__result, (expected))) { \
72 fprintf(stderr, #func "(%.20Lg, %.20Lg) = %.20Lg, " \
73 "expected %.20Lg\n", (x), (y), __result, (expected)); \
74 ok = 0; \
75 } \
76 } while (0)
77
78 int
testall_r(long double big,long double small)79 testall_r(long double big, long double small)
80 {
81 int ok;
82
83 long double expected_max = isnan(big) ? small : big;
84 long double expected_min = isnan(small) ? big : small;
85 ok = 1;
86
87 TEST(fmaxf, float, big, small, expected_max);
88 TEST(fmaxf, float, small, big, expected_max);
89 TEST(fmax, double, big, small, expected_max);
90 TEST(fmax, double, small, big, expected_max);
91 TEST(fmaxl, long double, big, small, expected_max);
92 TEST(fmaxl, long double, small, big, expected_max);
93 TEST(fminf, float, big, small, expected_min);
94 TEST(fminf, float, small, big, expected_min);
95 TEST(fmin, double, big, small, expected_min);
96 TEST(fmin, double, small, big, expected_min);
97 TEST(fminl, long double, big, small, expected_min);
98 TEST(fminl, long double, small, big, expected_min);
99
100 return (ok);
101 }
102
103 /*
104 * Test all the functions: fmaxf, fmax, fmaxl, fminf, fmin, and fminl,
105 * in all rounding modes and with the arguments in different orders.
106 * The input 'big' must be >= 'small'.
107 */
108 void
testall(int testnum,long double big,long double small)109 testall(int testnum, long double big, long double small)
110 {
111 static const int rmodes[] = {
112 FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
113 };
114 int i;
115
116 for (i = 0; i < 4; i++) {
117 fesetround(rmodes[i]);
118 if (!testall_r(big, small)) {
119 fprintf(stderr, "FAILURE in rounding mode %d\n",
120 rmodes[i]);
121 break;
122 }
123 }
124 printf("%sok %d - big = %.20Lg, small = %.20Lg\n",
125 (i == 4) ? "" : "not ", testnum, big, small);
126 }
127
128 int
main(int argc,char * argv[])129 main(int argc, char *argv[])
130 {
131
132 printf("1..12\n");
133
134 testall(1, 1.0, 0.0);
135 testall(2, 42.0, nextafterf(42.0, -INFINITY));
136 testall(3, nextafterf(42.0, INFINITY), 42.0);
137 testall(4, -5.0, -5.0);
138 testall(5, -3.0, -4.0);
139 testall(6, 1.0, NAN);
140 testall(7, INFINITY, NAN);
141 testall(8, INFINITY, 1.0);
142 testall(9, -3.0, -INFINITY);
143 testall(10, 3.0, -INFINITY);
144 testall(11, NAN, NAN);
145
146 /* This test isn't strictly required to work by C99. */
147 testall(12, 0.0, -0.0);
148
149 return (0);
150 }
151