1/* Test file for mpfr_set_d and mpfr_get_d. 2 3Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 4Contributed by the Arenaire and Cacao projects, INRIA. 5 6This file is part of the GNU MPFR Library. 7 8The GNU MPFR Library is free software; you can redistribute it and/or modify 9it under the terms of the GNU Lesser General Public License as published by 10the Free Software Foundation; either version 3 of the License, or (at your 11option) any later version. 12 13The GNU MPFR Library is distributed in the hope that it will be useful, but 14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16License for more details. 17 18You should have received a copy of the GNU Lesser General Public License 19along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23#include <stdio.h> 24#include <stdlib.h> 25#include <float.h> 26 27#include "mpfr-test.h" 28 29int 30main (int argc, char *argv[]) 31{ 32 mpfr_t x, y, z; 33 unsigned long k, n; 34 volatile double d; 35 double dd; 36 37 tests_start_mpfr (); 38 mpfr_test_init (); 39 40#ifndef MPFR_DOUBLE_SPEC 41 printf ("Warning! The MPFR_DOUBLE_SPEC macro is not defined. This means\n" 42 "that you do not have a conforming C implementation and problems\n" 43 "may occur with conversions between MPFR numbers and standard\n" 44 "floating-point types. Please contact the MPFR team.\n"); 45#elif MPFR_DOUBLE_SPEC == 0 46 /* 47 printf ("The type 'double' of your C implementation does not seem to\n" 48 "correspond to the IEEE-754 double precision. Though code has\n" 49 "been written to support such implementations, tests have been\n" 50 "done only on IEEE-754 double-precision implementations and\n" 51 "conversions between MPFR numbers and standard floating-point\n" 52 "types may be inaccurate. You may wish to contact the MPFR team\n" 53 "for further testing.\n"); 54 */ 55 printf ("The type 'double' of your C implementation does not seem to\n" 56 "correspond to the IEEE-754 double precision. Such particular\n" 57 "implementations are not supported yet, and conversions between\n" 58 "MPFR numbers and standard floating-point types may be very\n" 59 "inaccurate.\n"); 60 printf ("FLT_RADIX = %ld\n", (long) FLT_RADIX); 61 printf ("DBL_MANT_DIG = %ld\n", (long) DBL_MANT_DIG); 62 printf ("DBL_MIN_EXP = %ld\n", (long) DBL_MIN_EXP); 63 printf ("DBL_MAX_EXP = %ld\n", (long) DBL_MAX_EXP); 64#endif 65 66 mpfr_init (x); 67 68 mpfr_set_nan (x); 69 d = mpfr_get_d (x, MPFR_RNDN); 70 if (! DOUBLE_ISNAN (d)) 71 { 72 printf ("ERROR for NAN (1)\n"); 73#ifdef MPFR_NANISNAN 74 printf ("The reason is that NAN == NAN. Please look at the configure " 75 "output\nand Section \"In case of problem\" of the INSTALL " 76 "file.\n"); 77#endif 78 exit (1); 79 } 80 mpfr_set_ui (x, 0, MPFR_RNDN); 81 mpfr_set_d (x, d, MPFR_RNDN); 82 if (! mpfr_nan_p (x)) 83 { 84 printf ("ERROR for NAN (2)\n"); 85#ifdef MPFR_NANISNAN 86 printf ("The reason is that NAN == NAN. Please look at the configure " 87 "output\nand Section \"In case of problem\" of the INSTALL " 88 "file.\n"); 89#endif 90 exit (1); 91 } 92 93 d = 0.0; 94 mpfr_set_d (x, d, MPFR_RNDN); 95 MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x)); 96 d = -d; 97 mpfr_set_d (x, d, MPFR_RNDN); 98 if (mpfr_cmp_ui (x, 0) != 0 || MPFR_IS_POS(x)) 99 { 100 printf ("Error in mpfr_set_d on -0\n"); 101 exit (1); 102 } 103 104 mpfr_set_inf (x, 1); 105 d = mpfr_get_d (x, MPFR_RNDN); 106 mpfr_set_ui (x, 0, MPFR_RNDN); 107 mpfr_set_d (x, d, MPFR_RNDN); 108 MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0); 109 110 mpfr_set_inf (x, -1); 111 d = mpfr_get_d (x, MPFR_RNDN); 112 mpfr_set_ui (x, 0, MPFR_RNDN); 113 mpfr_set_d (x, d, MPFR_RNDN); 114 MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0); 115 116 mpfr_set_prec (x, 2); 117 118 /* checks that denormalized are not flushed to zero */ 119 d = DBL_MIN; /* 2^(-1022) */ 120 for (n=0; n<52; n++, d /= 2.0) 121 if (d != 0.0) /* should be 2^(-1022-n) */ 122 { 123 mpfr_set_d (x, d, MPFR_RNDN); 124 if (mpfr_cmp_ui_2exp (x, 1, -1022-n)) 125 { 126 printf ("Wrong result for d=2^(%ld), ", -1022-n); 127 printf ("got "); 128 mpfr_out_str (stdout, 10, 10, x, MPFR_RNDN); 129 printf ("\n"); 130 mpfr_print_binary (x); 131 puts (""); 132 exit (1); 133 } 134 } 135 136 /* checks that rounds to nearest sets the last 137 bit to zero in case of equal distance */ 138 mpfr_set_d (x, 5.0, MPFR_RNDN); 139 if (mpfr_cmp_ui (x, 4)) 140 { 141 printf ("Error in tset_d: expected 4.0, got "); 142 mpfr_print_binary (x); putchar('\n'); 143 exit (1); 144 } 145 mpfr_set_d (x, -5.0, MPFR_RNDN); 146 if (mpfr_cmp_si (x, -4)) 147 { 148 printf ("Error in tset_d: expected -4.0, got "); 149 mpfr_print_binary (x); putchar('\n'); 150 exit (1); 151 } 152 153 mpfr_set_d (x, 9.84891017624509146344e-01, MPFR_RNDU); 154 if (mpfr_cmp_ui (x, 1)) 155 { 156 printf ("Error in tset_d: expected 1.0, got "); 157 mpfr_print_binary (x); putchar('\n'); 158 exit (1); 159 } 160 161 mpfr_init2 (z, 32); 162 mpfr_set_d (z, 1.0, (mpfr_rnd_t) 0); 163 if (mpfr_cmp_ui (z, 1)) 164 { 165 mpfr_print_binary (z); puts (""); 166 printf ("Error: 1.0 != 1.0\n"); 167 exit (1); 168 } 169 mpfr_set_prec (x, 53); 170 mpfr_init2 (y, 53); 171 mpfr_set_d (x, d=-1.08007920352320089721e+150, (mpfr_rnd_t) 0); 172 if (mpfr_get_d1 (x) != d) 173 { 174 mpfr_print_binary (x); puts (""); 175 printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n", 176 d, mpfr_get_d1 (x)); 177 exit (1); 178 } 179 180 mpfr_set_d (x, 8.06294740693074521573e-310, (mpfr_rnd_t) 0); 181 d = -6.72658901114033715233e-165; 182 mpfr_set_d (x, d, (mpfr_rnd_t) 0); 183 if (d != mpfr_get_d1 (x)) 184 { 185 mpfr_print_binary (x); 186 puts (""); 187 printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n", 188 d, mpfr_get_d1 (x)); 189 exit (1); 190 } 191 192 n = (argc==1) ? 500000 : atoi(argv[1]); 193 for (k = 1; k <= n; k++) 194 { 195 do 196 { 197 d = DBL_RAND (); 198 } 199#ifdef HAVE_DENORMS 200 while (0); 201#else 202 while (ABS(d) < DBL_MIN); 203#endif 204 mpfr_set_d (x, d, (mpfr_rnd_t) 0); 205 dd = mpfr_get_d1 (x); 206 if (d != dd && !(Isnan(d) && Isnan(dd))) 207 { 208 printf ("Mismatch on : %1.18g != %1.18g\n", d, mpfr_get_d1 (x)); 209 mpfr_print_binary (x); 210 puts (""); 211 exit (1); 212 } 213 } 214 215 mpfr_clear (x); 216 mpfr_clear (y); 217 mpfr_clear (z); 218 219 tests_end_mpfr (); 220 return 0; 221} 222