1 /* $OpenBSD: nearbyint_test.c,v 1.2 2021/12/13 16:56:48 deraadt Exp $ */ 2 /*- 3 * Copyright (c) 2010 David Schultz <das@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include "macros.h" 29 30 /* 31 * Tests for nearbyint{,f,l}() 32 * 33 * TODO: 34 * - adapt tests for rint(3) 35 * - tests for harder values (more mantissa bits than float) 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/types.h> 42 #include <fenv.h> 43 #include <math.h> 44 #include <stdio.h> 45 46 #include "test-utils.h" 47 48 static const int rmodes[] = { 49 FE_TONEAREST, FE_DOWNWARD, FE_UPWARD, FE_TOWARDZERO, 50 }; 51 52 /* Make sure we're testing the library, not some broken compiler built-ins. */ 53 static double (*libnearbyint)(double) = nearbyint; 54 static float (*libnearbyintf)(float) = nearbyintf; 55 static long double (*libnearbyintl)(long double) = nearbyintl; 56 #define nearbyintf libnearbyintf 57 #define nearbyint libnearbyint 58 #define nearbyintl libnearbyintl 59 60 static const struct { 61 float in; 62 float out[3]; /* one answer per rounding mode except towardzero */ 63 } tests[] = { 64 /* input output (expected) */ 65 { 0.0, { 0.0, 0.0, 0.0 }}, 66 { 0.5, { 0.0, 0.0, 1.0 }}, 67 { M_PI, { 3.0, 3.0, 4.0 }}, 68 { 65536.5, { 65536, 65536, 65537 }}, 69 { INFINITY, { INFINITY, INFINITY, INFINITY }}, 70 { NAN, { NAN, NAN, NAN }}, 71 }; 72 73 /* Get the appropriate result for the current rounding mode. */ 74 static float 75 get_output(int testindex, int rmodeindex, int negative) 76 { 77 double out; 78 79 if (negative) { /* swap downwards and upwards if input is negative */ 80 if (rmodeindex == 1) 81 rmodeindex = 2; 82 else if (rmodeindex == 2) 83 rmodeindex = 1; 84 } 85 if (rmodeindex == 3) /* FE_TOWARDZERO uses the value for downwards */ 86 rmodeindex = 1; 87 out = tests[testindex].out[rmodeindex]; 88 return (negative ? -out : out); 89 } 90 91 static void 92 test_nearby(int testindex) 93 { 94 float in, out; 95 unsigned i; 96 97 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 98 ATF_REQUIRE_EQ(0, fesetround(rmodes[i])); 99 ATF_REQUIRE_EQ(0, feclearexcept(ALL_STD_EXCEPT)); 100 101 in = tests[testindex].in; 102 out = get_output(testindex, i, 0); 103 CHECK_FPEQUAL(out, libnearbyintf(in)); 104 CHECK_FPEQUAL(out, nearbyint(in)); 105 CHECK_FPEQUAL(out, nearbyintl(in)); 106 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 107 108 in = -tests[testindex].in; 109 out = get_output(testindex, i, 1); 110 CHECK_FPEQUAL(out, nearbyintf(in)); 111 CHECK_FPEQUAL(out, nearbyint(in)); 112 CHECK_FPEQUAL(out, nearbyintl(in)); 113 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 114 } 115 } 116 117 static void 118 test_modf(int testindex) 119 { 120 float in, out; 121 float ipartf, ipart_expected; 122 double ipart; 123 long double ipartl; 124 unsigned i; 125 126 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 127 ATF_REQUIRE_EQ(0, fesetround(rmodes[i])); 128 ATF_REQUIRE_EQ(0, feclearexcept(ALL_STD_EXCEPT)); 129 130 in = tests[testindex].in; 131 ipart_expected = tests[testindex].out[1]; 132 out = copysignf( 133 isinf(ipart_expected) ? 0.0 : in - ipart_expected, in); 134 ipartl = ipart = ipartf = 42.0; 135 136 CHECK_FPEQUAL(out, modff(in, &ipartf)); 137 CHECK_FPEQUAL(ipart_expected, ipartf); 138 CHECK_FPEQUAL(out, modf(in, &ipart)); 139 CHECK_FPEQUAL(ipart_expected, ipart); 140 CHECK_FPEQUAL(out, modfl(in, &ipartl)); 141 CHECK_FPEQUAL(ipart_expected, ipartl); 142 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 143 144 in = -in; 145 ipart_expected = -ipart_expected; 146 out = -out; 147 ipartl = ipart = ipartf = 42.0; 148 CHECK_FPEQUAL(out, modff(in, &ipartf)); 149 CHECK_FPEQUAL(ipart_expected, ipartf); 150 CHECK_FPEQUAL(out, modf(in, &ipart)); 151 CHECK_FPEQUAL(ipart_expected, ipart); 152 CHECK_FPEQUAL(out, modfl(in, &ipartl)); 153 CHECK_FPEQUAL(ipart_expected, ipartl); 154 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 155 } 156 } 157 158 ATF_TC_WITHOUT_HEAD(nearbyint); 159 ATF_TC_BODY(nearbyint, tc) 160 { 161 unsigned i; 162 163 for (i = 0; i < nitems(tests); i++) { 164 test_nearby(i); 165 test_modf(i); 166 } 167 } 168 169 ATF_TP_ADD_TCS(tp) 170 { 171 ATF_TP_ADD_TC(tp, nearbyint); 172 173 return (atf_no_error()); 174 } 175