test-fmaxmin.c revision 216222
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 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 */ 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