2 * Copyright (c) 2008 David Schultz <das@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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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
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21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * Tests for fmax{,f,l}() and fmin{,f,l}.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
39 #define ALL_STD_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
40 FE_OVERFLOW | FE_UNDERFLOW)
42 #pragma STDC FENV_ACCESS ON
45 * Test for equality with two special rules:
46 * fpequal(NaN, NaN) is true
47 * fpequal(+0.0, -0.0) is false
50 fpequal(long double x, long double y)
53 return ((x == y && signbit(x) == signbit(y)) || (isnan(x) && isnan(y)));
57 * Test whether func(x, y) has the expected result, and make sure no
58 * exceptions are raised.
60 #define TEST(func, type, x, y, expected) do { \
61 type __x = (x); /* convert before we clear exceptions */ \
63 feclearexcept(ALL_STD_EXCEPT); \
64 long double __result = func((__x), (__y)); \
65 if (fetestexcept(ALL_STD_EXCEPT)) { \
66 fprintf(stderr, #func "(%L.20g, %L.20g) raised 0x%x\n", \
67 (x), (y), fetestexcept(FE_ALL_EXCEPT)); \
70 if (!fpequal(__result, (expected))) { \
71 fprintf(stderr, #func "(%.20Lg, %.20Lg) = %.20Lg, " \
72 "expected %.20Lg\n", (x), (y), __result, (expected)); \
78 testall_r(long double big, long double small)
82 long double expected_max = isnan(big) ? small : big;
83 long double expected_min = isnan(small) ? big : small;
86 TEST(fmaxf, float, big, small, expected_max);
87 TEST(fmaxf, float, small, big, expected_max);
88 TEST(fmax, double, big, small, expected_max);
89 TEST(fmax, double, small, big, expected_max);
90 TEST(fmaxl, long double, big, small, expected_max);
91 TEST(fmaxl, long double, small, big, expected_max);
92 TEST(fminf, float, big, small, expected_min);
93 TEST(fminf, float, small, big, expected_min);
94 TEST(fmin, double, big, small, expected_min);
95 TEST(fmin, double, small, big, expected_min);
96 TEST(fminl, long double, big, small, expected_min);
97 TEST(fminl, long double, small, big, expected_min);
103 * Test all the functions: fmaxf, fmax, fmaxl, fminf, fmin, and fminl,
104 * in all rounding modes and with the arguments in different orders.
105 * The input 'big' must be >= 'small'.
108 testall(int testnum, long double big, long double small)
110 static const int rmodes[] = {
111 FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
115 for (i = 0; i < 4; i++) {
116 fesetround(rmodes[i]);
117 if (!testall_r(big, small)) {
118 fprintf(stderr, "FAILURE in rounding mode %d\n",
123 printf("%sok %d - big = %.20Lg, small = %.20Lg\n",
124 (i == 4) ? "" : "not ", testnum, big, small);
128 main(int argc, char *argv[])
133 testall(1, 1.0, 0.0);
134 testall(2, 42.0, nextafterf(42.0, -INFINITY));
135 testall(3, nextafterf(42.0, INFINITY), 42.0);
136 testall(4, -5.0, -5.0);
137 testall(5, -3.0, -4.0);
138 testall(6, 1.0, NAN);
139 testall(7, INFINITY, NAN);
140 testall(8, INFINITY, 1.0);
141 testall(9, -3.0, -INFINITY);
142 testall(10, 3.0, -INFINITY);
143 testall(11, NAN, NAN);
145 /* This test isn't strictly required to work by C99. */
146 testall(12, 0.0, -0.0);