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 <assert.h> 40 #include <fenv.h> 41 #include <math.h> 42 #include <stdio.h> 43 44 #include "test-utils.h" 45 46 static int testnum; 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 fesetround(rmodes[i]); 99 feclearexcept(ALL_STD_EXCEPT); 100 101 in = tests[testindex].in; 102 out = get_output(testindex, i, 0); 103 assert(fpequal(out, libnearbyintf(in))); 104 assert(fpequal(out, nearbyint(in))); 105 assert(fpequal(out, nearbyintl(in))); 106 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 107 108 in = -tests[testindex].in; 109 out = get_output(testindex, i, 1); 110 assert(fpequal(out, nearbyintf(in))); 111 assert(fpequal(out, nearbyint(in))); 112 assert(fpequal(out, nearbyintl(in))); 113 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 114 } 115 116 printf("ok %d\t\t# nearbyint(+%g)\n", testnum++, in); 117 } 118 119 static void 120 test_modf(int testindex) 121 { 122 float in, out; 123 float ipartf, ipart_expected; 124 double ipart; 125 long double ipartl; 126 unsigned i; 127 128 for (i = 0; i < sizeof(rmodes) / sizeof(rmodes[0]); i++) { 129 fesetround(rmodes[i]); 130 feclearexcept(ALL_STD_EXCEPT); 131 132 in = tests[testindex].in; 133 ipart_expected = tests[testindex].out[1]; 134 out = copysignf( 135 isinf(ipart_expected) ? 0.0 : in - ipart_expected, in); 136 ipartl = ipart = ipartf = 42.0; 137 138 assert(fpequal(out, modff(in, &ipartf))); 139 assert(fpequal(ipart_expected, ipartf)); 140 assert(fpequal(out, modf(in, &ipart))); 141 assert(fpequal(ipart_expected, ipart)); 142 assert(fpequal(out, modfl(in, &ipartl))); 143 assert(fpequal(ipart_expected, ipartl)); 144 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 145 146 in = -in; 147 ipart_expected = -ipart_expected; 148 out = -out; 149 ipartl = ipart = ipartf = 42.0; 150 assert(fpequal(out, modff(in, &ipartf))); 151 assert(fpequal(ipart_expected, ipartf)); 152 assert(fpequal(out, modf(in, &ipart))); 153 assert(fpequal(ipart_expected, ipart)); 154 assert(fpequal(out, modfl(in, &ipartl))); 155 assert(fpequal(ipart_expected, ipartl)); 156 assert(fetestexcept(ALL_STD_EXCEPT) == 0); 157 } 158 159 printf("ok %d\t\t# modf(+%g)\n", testnum++, in); 160 } 161 162 int 163 main(void) 164 { 165 unsigned i; 166 167 printf("1..%zu\n", (size_t)(nitems(tests) * 2)); 168 testnum = 1; 169 for (i = 0; i < nitems(tests); i++) { 170 test_nearby(i); 171 test_modf(i); 172 } 173 174 return (0); 175 } 176