1 /*- 2 * Copyright (c) 2010 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 nearbyint{,f,l}() 29 * 30 * TODO: 31 * - adapt tests for rint(3) 32 * - tests for harder values (more mantissa bits than float) 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <fenv.h> 40 #include <math.h> 41 #include <stdio.h> 42 43 #include "test-utils.h" 44 45 static const int rmodes[] = { 46 FE_TONEAREST, FE_DOWNWARD, FE_UPWARD, FE_TOWARDZERO, 47 }; 48 49 /* Make sure we're testing the library, not some broken compiler built-ins. */ 50 static double (*libnearbyint)(double) = nearbyint; 51 static float (*libnearbyintf)(float) = nearbyintf; 52 static long double (*libnearbyintl)(long double) = nearbyintl; 53 #define nearbyintf libnearbyintf 54 #define nearbyint libnearbyint 55 #define nearbyintl libnearbyintl 56 57 static const struct { 58 float in; 59 float out[3]; /* one answer per rounding mode except towardzero */ 60 } tests[] = { 61 /* input output (expected) */ 62 { 0.0, { 0.0, 0.0, 0.0 }}, 63 { 0.5, { 0.0, 0.0, 1.0 }}, 64 { M_PI, { 3.0, 3.0, 4.0 }}, 65 { 65536.5, { 65536, 65536, 65537 }}, 66 { INFINITY, { INFINITY, INFINITY, INFINITY }}, 67 { NAN, { NAN, NAN, NAN }}, 68 }; 69 70 /* Get the appropriate result for the current rounding mode. */ 71 static float 72 get_output(int testindex, int rmodeindex, int negative) 73 { 74 double out; 75 76 if (negative) { /* swap downwards and upwards if input is negative */ 77 if (rmodeindex == 1) 78 rmodeindex = 2; 79 else if (rmodeindex == 2) 80 rmodeindex = 1; 81 } 82 if (rmodeindex == 3) /* FE_TOWARDZERO uses the value for downwards */ 83 rmodeindex = 1; 84 out = tests[testindex].out[rmodeindex]; 85 return (negative ? -out : out); 86 } 87 88 static void 89 test_nearby(int testindex) 90 { 91 float in, out; 92 unsigned i; 93 94 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 95 ATF_REQUIRE_EQ(0, fesetround(rmodes[i])); 96 ATF_REQUIRE_EQ(0, feclearexcept(ALL_STD_EXCEPT)); 97 98 in = tests[testindex].in; 99 out = get_output(testindex, i, 0); 100 CHECK_FPEQUAL(out, libnearbyintf(in)); 101 CHECK_FPEQUAL(out, nearbyint(in)); 102 CHECK_FPEQUAL(out, nearbyintl(in)); 103 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 104 105 in = -tests[testindex].in; 106 out = get_output(testindex, i, 1); 107 CHECK_FPEQUAL(out, nearbyintf(in)); 108 CHECK_FPEQUAL(out, nearbyint(in)); 109 CHECK_FPEQUAL(out, nearbyintl(in)); 110 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 111 } 112 } 113 114 static void 115 test_modf(int testindex) 116 { 117 float in, out; 118 float ipartf, ipart_expected; 119 double ipart; 120 long double ipartl; 121 unsigned i; 122 123 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 124 ATF_REQUIRE_EQ(0, fesetround(rmodes[i])); 125 ATF_REQUIRE_EQ(0, feclearexcept(ALL_STD_EXCEPT)); 126 127 in = tests[testindex].in; 128 ipart_expected = tests[testindex].out[1]; 129 out = copysignf( 130 isinf(ipart_expected) ? 0.0 : in - ipart_expected, in); 131 ipartl = ipart = ipartf = 42.0; 132 133 CHECK_FPEQUAL(out, modff(in, &ipartf)); 134 CHECK_FPEQUAL(ipart_expected, ipartf); 135 CHECK_FPEQUAL(out, modf(in, &ipart)); 136 CHECK_FPEQUAL(ipart_expected, ipart); 137 CHECK_FPEQUAL(out, modfl(in, &ipartl)); 138 CHECK_FPEQUAL(ipart_expected, ipartl); 139 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 140 141 in = -in; 142 ipart_expected = -ipart_expected; 143 out = -out; 144 ipartl = ipart = ipartf = 42.0; 145 CHECK_FPEQUAL(out, modff(in, &ipartf)); 146 CHECK_FPEQUAL(ipart_expected, ipartf); 147 CHECK_FPEQUAL(out, modf(in, &ipart)); 148 CHECK_FPEQUAL(ipart_expected, ipart); 149 CHECK_FPEQUAL(out, modfl(in, &ipartl)); 150 CHECK_FPEQUAL(ipart_expected, ipartl); 151 CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT); 152 } 153 } 154 155 ATF_TC_WITHOUT_HEAD(nearbyint); 156 ATF_TC_BODY(nearbyint, tc) 157 { 158 unsigned i; 159 160 for (i = 0; i < nitems(tests); i++) { 161 test_nearby(i); 162 test_modf(i); 163 } 164 } 165 166 ATF_TP_ADD_TCS(tp) 167 { 168 ATF_TP_ADD_TC(tp, nearbyint); 169 170 return (atf_no_error()); 171 } 172