next_test.c revision 293267
1/*- 2 * Copyright (c) 2005 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 * Test the correctness of nextafter{,f,l} and nexttoward{,f,l}. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/10/lib/msun/tests/next_test.c 293267 2016-01-06 20:21:40Z ngie $"); 33 34#include <fenv.h> 35#include <float.h> 36#include <math.h> 37#include <stdio.h> 38#include <stdlib.h> 39 40#ifdef __i386__ 41#include <ieeefp.h> 42#endif 43 44#include "test-utils.h" 45 46#define test(exp, ans, ex) do { \ 47 double __ans = (ans); \ 48 feclearexcept(ALL_STD_EXCEPT); \ 49 _testl(#exp, __LINE__, (exp), __ans, (ex)); \ 50} while (0) 51#define testf(exp, ans, ex) do { \ 52 float __ans = (ans); \ 53 feclearexcept(ALL_STD_EXCEPT); \ 54 _testl(#exp, __LINE__, (exp), __ans, (ex)); \ 55} while (0) 56#define testl(exp, ans, ex) do { \ 57 long double __ans = (ans); \ 58 feclearexcept(ALL_STD_EXCEPT); \ 59 _testl(#exp, __LINE__, (exp), __ans, (ex)); \ 60} while (0) 61#define testboth(arg1, arg2, ans, ex, prec) do { \ 62 test##prec(nextafter##prec((arg1), (arg2)), (ans), (ex)); \ 63 test##prec(nexttoward##prec((arg1), (arg2)), (ans), (ex)); \ 64} while (0) 65#define testall(arg1, arg2, ans, ex) do { \ 66 testboth((arg1), (arg2), (ans), (ex), ); \ 67 testboth((arg1), (arg2), (ans), (ex), f); \ 68 testboth((arg1), (arg2), (ans), (ex), l); \ 69} while (0) 70 71static void _testl(const char *, int, long double, long double, int); 72static double idd(double); 73static float idf(float); 74 75int 76main(int argc, char *argv[]) 77{ 78 static const int ex_under = FE_UNDERFLOW | FE_INEXACT; /* shorthand */ 79 static const int ex_over = FE_OVERFLOW | FE_INEXACT; 80 long double ldbl_small, ldbl_eps, ldbl_max; 81 82 printf("1..5\n"); 83 84#ifdef __i386__ 85 fpsetprec(FP_PE); 86#endif 87 /* 88 * We can't use a compile-time constant here because gcc on 89 * FreeBSD/i386 assumes long doubles are truncated to the 90 * double format. 91 */ 92 ldbl_small = ldexpl(1.0, LDBL_MIN_EXP - LDBL_MANT_DIG); 93 ldbl_eps = LDBL_EPSILON; 94 ldbl_max = ldexpl(1.0 - ldbl_eps / 2, LDBL_MAX_EXP); 95 96 /* 97 * Special cases involving zeroes. 98 */ 99#define ztest(prec) \ 100 test##prec(copysign##prec(1.0, nextafter##prec(0.0, -0.0)), -1.0, 0); \ 101 test##prec(copysign##prec(1.0, nextafter##prec(-0.0, 0.0)), 1.0, 0); \ 102 test##prec(copysign##prec(1.0, nexttoward##prec(0.0, -0.0)), -1.0, 0);\ 103 test##prec(copysign##prec(1.0, nexttoward##prec(-0.0, 0.0)), 1.0, 0) 104 105 ztest(); 106 ztest(f); 107 ztest(l); 108#undef ztest 109 110#define stest(next, eps, prec) \ 111 test##prec(next(-0.0, 42.0), eps, ex_under); \ 112 test##prec(next(0.0, -42.0), -eps, ex_under); \ 113 test##prec(next(0.0, INFINITY), eps, ex_under); \ 114 test##prec(next(-0.0, -INFINITY), -eps, ex_under) 115 116 stest(nextafter, 0x1p-1074, ); 117 stest(nextafterf, 0x1p-149f, f); 118 stest(nextafterl, ldbl_small, l); 119 stest(nexttoward, 0x1p-1074, ); 120 stest(nexttowardf, 0x1p-149f, f); 121 stest(nexttowardl, ldbl_small, l); 122#undef stest 123 124 printf("ok 1 - next\n"); 125 126 /* 127 * `x == y' and NaN tests 128 */ 129 testall(42.0, 42.0, 42.0, 0); 130 testall(-42.0, -42.0, -42.0, 0); 131 testall(INFINITY, INFINITY, INFINITY, 0); 132 testall(-INFINITY, -INFINITY, -INFINITY, 0); 133 testall(NAN, 42.0, NAN, 0); 134 testall(42.0, NAN, NAN, 0); 135 testall(NAN, NAN, NAN, 0); 136 137 printf("ok 2 - next\n"); 138 139 /* 140 * Tests where x is an ordinary normalized number 141 */ 142 testboth(1.0, 2.0, 1.0 + DBL_EPSILON, 0, ); 143 testboth(1.0, -INFINITY, 1.0 - DBL_EPSILON/2, 0, ); 144 testboth(1.0, 2.0, 1.0 + FLT_EPSILON, 0, f); 145 testboth(1.0, -INFINITY, 1.0 - FLT_EPSILON/2, 0, f); 146 testboth(1.0, 2.0, 1.0 + ldbl_eps, 0, l); 147 testboth(1.0, -INFINITY, 1.0 - ldbl_eps/2, 0, l); 148 149 testboth(-1.0, 2.0, -1.0 + DBL_EPSILON/2, 0, ); 150 testboth(-1.0, -INFINITY, -1.0 - DBL_EPSILON, 0, ); 151 testboth(-1.0, 2.0, -1.0 + FLT_EPSILON/2, 0, f); 152 testboth(-1.0, -INFINITY, -1.0 - FLT_EPSILON, 0, f); 153 testboth(-1.0, 2.0, -1.0 + ldbl_eps/2, 0, l); 154 testboth(-1.0, -INFINITY, -1.0 - ldbl_eps, 0, l); 155 156 /* Cases where nextafter(...) != nexttoward(...) */ 157 test(nexttoward(1.0, 1.0 + ldbl_eps), 1.0 + DBL_EPSILON, 0); 158 testf(nexttowardf(1.0, 1.0 + ldbl_eps), 1.0 + FLT_EPSILON, 0); 159 testl(nexttowardl(1.0, 1.0 + ldbl_eps), 1.0 + ldbl_eps, 0); 160 161 printf("ok 3 - next\n"); 162 163 /* 164 * Tests at word boundaries, normalization boundaries, etc. 165 */ 166 testboth(0x1.87654ffffffffp+0, INFINITY, 0x1.87655p+0, 0, ); 167 testboth(0x1.87655p+0, -INFINITY, 0x1.87654ffffffffp+0, 0, ); 168 testboth(0x1.fffffffffffffp+0, INFINITY, 0x1p1, 0, ); 169 testboth(0x1p1, -INFINITY, 0x1.fffffffffffffp+0, 0, ); 170 testboth(0x0.fffffffffffffp-1022, INFINITY, 0x1p-1022, 0, ); 171 testboth(0x1p-1022, -INFINITY, 0x0.fffffffffffffp-1022, ex_under, ); 172 173 testboth(0x1.fffffep0f, INFINITY, 0x1p1, 0, f); 174 testboth(0x1p1, -INFINITY, 0x1.fffffep0f, 0, f); 175 testboth(0x0.fffffep-126f, INFINITY, 0x1p-126f, 0, f); 176 testboth(0x1p-126f, -INFINITY, 0x0.fffffep-126f, ex_under, f); 177 178#if LDBL_MANT_DIG == 53 179 testboth(0x1.87654ffffffffp+0L, INFINITY, 0x1.87655p+0L, 0, l); 180 testboth(0x1.87655p+0L, -INFINITY, 0x1.87654ffffffffp+0L, 0, l); 181 testboth(0x1.fffffffffffffp+0L, INFINITY, 0x1p1L, 0, l); 182 testboth(0x1p1L, -INFINITY, 0x1.fffffffffffffp+0L, 0, l); 183 testboth(0x0.fffffffffffffp-1022L, INFINITY, 0x1p-1022L, 0, l); 184 testboth(0x1p-1022L, -INFINITY, 0x0.fffffffffffffp-1022L, ex_under, l); 185#elif LDBL_MANT_DIG == 64 && !defined(__i386) 186 testboth(0x1.87654321fffffffep+0L, INFINITY, 0x1.87654322p+0L, 0, l); 187 testboth(0x1.87654322p+0L, -INFINITY, 0x1.87654321fffffffep+0L, 0, l); 188 testboth(0x1.fffffffffffffffep0L, INFINITY, 0x1p1L, 0, l); 189 testboth(0x1p1L, -INFINITY, 0x1.fffffffffffffffep0L, 0, l); 190 testboth(0x0.fffffffffffffffep-16382L, INFINITY, 0x1p-16382L, 0, l); 191 testboth(0x1p-16382L, -INFINITY, 192 0x0.fffffffffffffffep-16382L, ex_under, l); 193#elif LDBL_MANT_DIG == 113 194 testboth(0x1.876543210987ffffffffffffffffp+0L, INFINITY, 195 0x1.876543210988p+0, 0, l); 196 testboth(0x1.876543210988p+0L, -INFINITY, 197 0x1.876543210987ffffffffffffffffp+0L, 0, l); 198 testboth(0x1.ffffffffffffffffffffffffffffp0L, INFINITY, 0x1p1L, 0, l); 199 testboth(0x1p1L, -INFINITY, 0x1.ffffffffffffffffffffffffffffp0L, 0, l); 200 testboth(0x0.ffffffffffffffffffffffffffffp-16382L, INFINITY, 201 0x1p-16382L, 0, l); 202 testboth(0x1p-16382L, -INFINITY, 203 0x0.ffffffffffffffffffffffffffffp-16382L, ex_under, l); 204#endif 205 206 printf("ok 4 - next\n"); 207 208 /* 209 * Overflow tests 210 */ 211 test(idd(nextafter(DBL_MAX, INFINITY)), INFINITY, ex_over); 212 test(idd(nextafter(INFINITY, 0.0)), DBL_MAX, 0); 213 test(idd(nexttoward(DBL_MAX, DBL_MAX * 2.0L)), INFINITY, ex_over); 214#if LDBL_MANT_DIG > 53 215 test(idd(nexttoward(INFINITY, DBL_MAX * 2.0L)), DBL_MAX, 0); 216#endif 217 218 testf(idf(nextafterf(FLT_MAX, INFINITY)), INFINITY, ex_over); 219 testf(idf(nextafterf(INFINITY, 0.0)), FLT_MAX, 0); 220 testf(idf(nexttowardf(FLT_MAX, FLT_MAX * 2.0)), INFINITY, ex_over); 221 testf(idf(nexttowardf(INFINITY, FLT_MAX * 2.0)), FLT_MAX, 0); 222 223 testboth(ldbl_max, INFINITY, INFINITY, ex_over, l); 224 testboth(INFINITY, 0.0, ldbl_max, 0, l); 225 226 printf("ok 5 - next\n"); 227 228 return (0); 229} 230 231static void 232_testl(const char *exp, int line, long double actual, long double expected, 233 int except) 234{ 235 int actual_except; 236 237 actual_except = fetestexcept(ALL_STD_EXCEPT); 238 if (!fpequal(actual, expected)) { 239 fprintf(stderr, "%d: %s returned %La, expecting %La\n", 240 line, exp, actual, expected); 241 abort(); 242 } 243 if (actual_except != except) { 244 fprintf(stderr, "%d: %s raised 0x%x, expecting 0x%x\n", 245 line, exp, actual_except, except); 246 abort(); 247 } 248} 249 250/* 251 * The idd() and idf() routines ensure that doubles and floats are 252 * converted to their respective types instead of stored in the FPU 253 * with extra precision. 254 */ 255static double 256idd(double x) 257{ 258 return (x); 259} 260 261static float 262idf(float x) 263{ 264 return (x); 265} 266