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 <assert.h> 39 #include <fenv.h> 40 #include <math.h> 41 #include <stdio.h> 42 43 #include "test-utils.h" 44 45 static int testnum; 46 47 static const int rmodes[] = { 48 FE_TONEAREST, FE_DOWNWARD, FE_UPWARD, FE_TOWARDZERO, 49 }; 50 51 /* Make sure we're testing the library, not some broken compiler built-ins. */ 52 double (*libnearbyint)(double) = nearbyint; 53 float (*libnearbyintf)(float) = nearbyintf; 54 long double (*libnearbyintl)(long double) = nearbyintl; 55 #define nearbyintf libnearbyintf 56 #define nearbyint libnearbyint 57 #define nearbyintl libnearbyintl 58 59 static const struct { 60 float in; 61 float out[3]; /* one answer per rounding mode except towardzero */ 62 } tests[] = { 63 /* input output (expected) */ 64 { 0.0, { 0.0, 0.0, 0.0 }}, 65 { 0.5, { 0.0, 0.0, 1.0 }}, 66 { M_PI, { 3.0, 3.0, 4.0 }}, 67 { 65536.5, { 65536, 65536, 65537 }}, 68 { INFINITY, { INFINITY, INFINITY, INFINITY }}, 69 { NAN, { NAN, NAN, NAN }}, 70 }; 71 72 static const int ntests = sizeof(tests) / sizeof(tests[0]); 73 74 /* Get the appropriate result for the current rounding mode. */ 75 static float 76 get_output(int testindex, int rmodeindex, int negative) 77 { 78 double out; 79 80 if (negative) { /* swap downwards and upwards if input is negative */ 81 if (rmodeindex == 1) 82 rmodeindex = 2; 83 else if (rmodeindex == 2) 84 rmodeindex = 1; 85 } 86 if (rmodeindex == 3) /* FE_TOWARDZERO uses the value for downwards */ 87 rmodeindex = 1; 88 out = tests[testindex].out[rmodeindex]; 89 return (negative ? -out : out); 90 } 91 92 static void 93 test_nearby(int testindex) 94 { 95 float in, out; 96 int i; 97 98 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 99 fesetround(rmodes[i]); 100 feclearexcept(ALL_STD_EXCEPT); 101 102 in = tests[testindex].in; 103 out = get_output(testindex, i, 0); 104 assert(fpequal(out, libnearbyintf(in))); 105 assert(fpequal(out, nearbyint(in))); 106 assert(fpequal(out, nearbyintl(in))); 107 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 108 109 in = -tests[testindex].in; 110 out = get_output(testindex, i, 1); 111 assert(fpequal(out, nearbyintf(in))); 112 assert(fpequal(out, nearbyint(in))); 113 assert(fpequal(out, nearbyintl(in))); 114 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 115 } 116 117 printf("ok %d\t\t# nearbyint(+%g)\n", testnum++, in); 118 } 119 120 static void 121 test_modf(int testindex) 122 { 123 float in, out; 124 float ipartf, ipart_expected; 125 double ipart; 126 long double ipartl; 127 int i; 128 129 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 130 fesetround(rmodes[i]); 131 feclearexcept(ALL_STD_EXCEPT); 132 133 in = tests[testindex].in; 134 ipart_expected = tests[testindex].out[1]; 135 out = copysignf( 136 isinf(ipart_expected) ? 0.0 : in - ipart_expected, in); 137 ipartl = ipart = ipartf = 42.0; 138 139 assert(fpequal(out, modff(in, &ipartf))); 140 assert(fpequal(ipart_expected, ipartf)); 141 assert(fpequal(out, modf(in, &ipart))); 142 assert(fpequal(ipart_expected, ipart)); 143 assert(fpequal(out, modfl(in, &ipartl))); 144 assert(fpequal(ipart_expected, ipartl)); 145 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 146 147 in = -in; 148 ipart_expected = -ipart_expected; 149 out = -out; 150 ipartl = ipart = ipartf = 42.0; 151 assert(fpequal(out, modff(in, &ipartf))); 152 assert(fpequal(ipart_expected, ipartf)); 153 assert(fpequal(out, modf(in, &ipart))); 154 assert(fpequal(ipart_expected, ipart)); 155 assert(fpequal(out, modfl(in, &ipartl))); 156 assert(fpequal(ipart_expected, ipartl)); 157 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 158 } 159 160 printf("ok %d\t\t# modf(+%g)\n", testnum++, in); 161 } 162 163 int 164 main(int argc, char *argv[]) 165 { 166 int i; 167 168 printf("1..%d\n", ntests * 2); 169 testnum = 1; 170 for (i = 0; i < ntests; i++) { 171 test_nearby(i); 172 test_modf(i); 173 } 174 175 return (0); 176 } 177