fmaxmin_test.c revision 314023 
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/10/lib/msun/tests/fmaxmin_test.c 314023 2017-02-21 03:50:57Z ngie $");
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) do {				      \
48	type __x = (x);	/* convert before we clear exceptions */	      \
49	type __y = (y);							      \
50	feclearexcept(ALL_STD_EXCEPT);					      \
51	long double __result = func((__x), (__y));			      \
52	if (fetestexcept(ALL_STD_EXCEPT)) {				      \
53		fprintf(stderr, #func "(%.20Lg, %.20Lg) raised 0x%x\n",	      \
54			(x), (y), fetestexcept(FE_ALL_EXCEPT));		      \
55		ok = 0;							      \
56	}								      \
57	if (!fpequal(__result, (expected)))	{			      \
58		fprintf(stderr, #func "(%.20Lg, %.20Lg) = %.20Lg, "	      \
59			"expected %.20Lg\n", (x), (y), __result, (expected)); \
60		ok = 0;							      \
61	}								      \
62} while (0)
63
64int
65testall_r(long double big, long double small)
66{
67	int ok;
68
69	long double expected_max = isnan(big) ? small : big;
70	long double expected_min = isnan(small) ? big : small;
71	ok = 1;
72
73	TEST(fmaxf, float, big, small, expected_max);
74	TEST(fmaxf, float, small, big, expected_max);
75	TEST(fmax, double, big, small, expected_max);
76	TEST(fmax, double, small, big, expected_max);
77	TEST(fmaxl, long double, big, small, expected_max);
78	TEST(fmaxl, long double, small, big, expected_max);
79	TEST(fminf, float, big, small, expected_min);
80	TEST(fminf, float, small, big, expected_min);
81	TEST(fmin, double, big, small, expected_min);
82	TEST(fmin, double, small, big, expected_min);
83	TEST(fminl, long double, big, small, expected_min);
84	TEST(fminl, long double, small, big, expected_min);
85
86	return (ok);
87}
88
89const char *comment = NULL;
90
91/*
92 * Test all the functions: fmaxf, fmax, fmaxl, fminf, fmin, and fminl,
93 * in all rounding modes and with the arguments in different orders.
94 * The input 'big' must be >= 'small'.
95 */
96void
97testall(int testnum, long double big, long double small)
98{
99	static const int rmodes[] = {
100		FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
101	};
102	int i;
103
104	for (i = 0; i < 4; i++) {
105		fesetround(rmodes[i]);
106		if (!testall_r(big, small)) {
107			fprintf(stderr, "FAILURE in rounding mode %d\n",
108				rmodes[i]);
109			break;
110		}
111	}
112	printf("%sok %d - big = %.20Lg, small = %.20Lg%s\n",
113	       (i == 4) ? "" : "not ", testnum, big, small,
114	       comment == NULL ? "" : comment);
115}
116
117/* Clang 3.8.0+ fails the invariants for testcase 6, 7, 10, and 11. */
118#if defined(__clang__) && \
119    ((__clang_major__ >  3)) || \
120    ((__clang_major__ == 3 && __clang_minor__ >= 8))
121#define	affected_by_bug_208703
122#endif
123
124int
125main(int argc, char *argv[])
126{
127
128	printf("1..12\n");
129
130	testall(1, 1.0, 0.0);
131	testall(2, 42.0, nextafterf(42.0, -INFINITY));
132	testall(3, nextafterf(42.0, INFINITY), 42.0);
133	testall(4, -5.0, -5.0);
134	testall(5, -3.0, -4.0);
135#ifdef affected_by_bug_208703
136	comment = "# TODO: testcase 6-7 fails invariant with clang 3.8+ (bug 208703)";
137#endif
138	testall(6, 1.0, NAN);
139	testall(7, INFINITY, NAN);
140	comment = NULL;
141	testall(8, INFINITY, 1.0);
142	testall(9, -3.0, -INFINITY);
143	testall(10, 3.0, -INFINITY);
144#ifdef affected_by_bug_208703
145	comment = "# TODO: testcase 11-12 fails invariant with clang 3.8+ (bug 208703)";
146#endif
147	testall(11, NAN, NAN);
148
149	/* This test isn't strictly required to work by C99. */
150	testall(12, 0.0, -0.0);
151	comment = NULL;
152
153	return (0);
154}
155