test-fmaxmin.c revision 180237 
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: head/tools/regression/lib/msun/test-fmaxmin.c 180237 2008-07-03 23:06:06Z 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 */
49inline int
50fpequal(long double x, long double y)
51{
52
53	return ((x == y && signbit(x) == signbit(y)) || (isnan(x) && isnan(y)));
54}
55
56/*
57 * Test whether func(x, y) has the expected result, and make sure no
58 * exceptions are raised.
59 */
60#define	TEST(func, type, x, y, expected) do {				      \
61	type __x = (x);	/* convert before we clear exceptions */	      \
62	type __y = (y);							      \
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));		      \
68		ok = 0;							      \
69	}								      \
70	if (!fpequal(__result, (expected)))	{			      \
71		fprintf(stderr, #func "(%.20Lg, %.20Lg) = %.20Lg, "	      \
72			"expected %.20Lg\n", (x), (y), __result, (expected)); \
73		ok = 0;							      \
74	}								      \
75} while (0)
76
77int
78testall_r(long double big, long double small)
79{
80	int ok;
81
82	long double expected_max = isnan(big) ? small : big;
83	long double expected_min = isnan(small) ? big : small;
84	ok = 1;
85
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);
98
99	return (ok);
100}
101
102/*
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'.
106 */
107int
108testall(int testnum, long double big, long double small)
109{
110	static const int rmodes[] = {
111		FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
112	};
113	int i;
114
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",
119				rmodes[i]);
120			break;
121		}
122	}
123	printf("%sok %d - big = %.20Lg, small = %.20Lg\n",
124	       (i == 4) ? "" : "not ", testnum, big, small);
125}
126
127int
128main(int argc, char *argv[])
129{
130
131	printf("1..12\n");
132
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);
144
145	/* This test isn't strictly required to work by C99. */
146	testall(12, 0.0, -0.0);
147
148	return (0);
149}
150