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