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 * $FreeBSD: src/tools/regression/lib/msun/test-fmaxmin.c,v 1.3 2010/12/06 00:02:49 das Exp $ 27 */ 28 29 /* 30 * Tests for fmax{,f,l}() and fmin{,f,l}. 31 */ 32 33 #include <fenv.h> 34 #include <float.h> 35 #include <math.h> 36 #include <stdio.h> 37 38 #define ALL_STD_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ 39 FE_OVERFLOW | FE_UNDERFLOW) 40 41 #pragma STDC FENV_ACCESS ON 42 43 /* 44 * Test for equality with two special rules: 45 * fpequal(NaN, NaN) is true 46 * fpequal(+0.0, -0.0) is false 47 */ 48 static inline int 49 fpequal(long double x, long double y) 50 { 51 52 return ((x == y && !signbit(x) == !signbit(y)) 53 || (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 "(%.20Lg, %.20Lg) 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 77 int 78 testall_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 */ 107 void 108 testall(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 } 126 127 int 128 main(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