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("$FreeBSD$");
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 */
49static inline int
50fpequal(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
78int
79testall_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 */
108void
109testall(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
128int
129main(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