1/* Test file for mpfr_get_decimal64 and mpfr_set_decimal64. 2 3Copyright 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 <stdlib.h> /* for exit */ 24#include "mpfr-test.h" 25 26/* #define DEBUG */ 27 28#ifdef MPFR_WANT_DECIMAL_FLOATS 29static void 30print_decimal64 (_Decimal64 d) 31{ 32 union ieee_double_extract x; 33 union ieee_double_decimal64 y; 34 unsigned int Gh, i; 35 36 y.d64 = d; 37 x.d = y.d; 38 Gh = x.s.exp >> 6; 39 printf ("|%d%d%d%d%d%d", x.s.sig, Gh >> 4, (Gh >> 3) & 1, 40 (Gh >> 2) & 1, (Gh >> 1) & 1, Gh & 1); 41 printf ("%d%d%d%d%d%d", (x.s.exp >> 5) & 1, (x.s.exp >> 4) & 1, 42 (x.s.exp >> 3) & 1, (x.s.exp >> 2) & 1, (x.s.exp >> 1) & 1, 43 x.s.exp & 1); 44 for (i = 20; i > 0; i--) 45 printf ("%d", (x.s.manh >> (i - 1)) & 1); 46 for (i = 32; i > 0; i--) 47 printf ("%d", (x.s.manl >> (i - 1)) & 1); 48 printf ("|\n"); 49} 50 51static void 52check_inf_nan (void) 53{ 54 mpfr_t x, y; 55 _Decimal64 d; 56 57 mpfr_init2 (x, 123); 58 mpfr_init2 (y, 123); 59 60 mpfr_set_nan (x); 61 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 62 mpfr_set_ui (x, 1, MPFR_RNDZ); 63 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 64 ASSERT_ALWAYS (mpfr_nan_p (x)); 65 66 mpfr_set_inf (x, 1); 67 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 68 mpfr_set_ui (x, 1, MPFR_RNDZ); 69 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 70 ASSERT_ALWAYS (mpfr_inf_p (x) && mpfr_sgn (x) > 0); 71 72 mpfr_set_inf (x, -1); 73 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 74 mpfr_set_ui (x, 1, MPFR_RNDZ); 75 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 76 ASSERT_ALWAYS (mpfr_inf_p (x) && mpfr_sgn (x) < 0); 77 78 mpfr_set_ui (x, 0, MPFR_RNDZ); 79 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 80 mpfr_set_ui (x, 1, MPFR_RNDZ); 81 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 82 ASSERT_ALWAYS (mpfr_cmp_ui (x, 0) == 0 && MPFR_SIGN (x) > 0); 83 84 mpfr_set_ui (x, 0, MPFR_RNDZ); 85 mpfr_neg (x, x, MPFR_RNDZ); 86 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 87 mpfr_set_ui (x, 1, MPFR_RNDZ); 88 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 89 ASSERT_ALWAYS (mpfr_cmp_ui (x, 0) == 0 && MPFR_SIGN (x) < 0); 90 91 mpfr_set_ui (x, 1, MPFR_RNDZ); 92 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 93 mpfr_set_ui (x, 0, MPFR_RNDZ); 94 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 95 ASSERT_ALWAYS (mpfr_cmp_ui (x, 1) == 0); 96 97 mpfr_set_si (x, -1, MPFR_RNDZ); 98 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 99 mpfr_set_ui (x, 0, MPFR_RNDZ); 100 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 101 ASSERT_ALWAYS (mpfr_cmp_si (x, -1) == 0); 102 103 mpfr_set_ui (x, 2, MPFR_RNDZ); 104 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 105 mpfr_set_ui (x, 0, MPFR_RNDZ); 106 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 107 ASSERT_ALWAYS (mpfr_cmp_ui (x, 2) == 0); 108 109 mpfr_set_ui (x, 99, MPFR_RNDZ); 110 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 111 mpfr_set_ui (x, 0, MPFR_RNDZ); 112 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 113 ASSERT_ALWAYS (mpfr_cmp_ui (x, 99) == 0); 114 115 mpfr_set_str (x, "9999999999999999", 10, MPFR_RNDZ); 116 mpfr_set (y, x, MPFR_RNDZ); 117 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 118 mpfr_set_ui (x, 0, MPFR_RNDZ); 119 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 120 ASSERT_ALWAYS (mpfr_cmp (x, y) == 0); 121 122 /* smallest normal number */ 123 mpfr_set_str (x, "1E-383", 10, MPFR_RNDU); 124 mpfr_set (y, x, MPFR_RNDZ); 125 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 126 mpfr_set_ui (x, 0, MPFR_RNDZ); 127 mpfr_set_decimal64 (x, d, MPFR_RNDU); 128 ASSERT_ALWAYS (mpfr_cmp (x, y) == 0); 129 130 /* smallest subnormal number */ 131 mpfr_set_str (x, "1E-398", 10, MPFR_RNDU); 132 mpfr_set (y, x, MPFR_RNDZ); 133 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 134 mpfr_set_ui (x, 0, MPFR_RNDZ); 135 mpfr_set_decimal64 (x, d, MPFR_RNDU); 136 ASSERT_ALWAYS (mpfr_cmp (x, y) == 0); 137 138 /* subnormal number with exponent change when we round back 139 from 16 digits to 1 digit */ 140 mpfr_set_str (x, "9.9E-398", 10, MPFR_RNDN); 141 d = mpfr_get_decimal64 (x, MPFR_RNDU); /* should be 1E-397 */ 142 mpfr_set_ui (x, 0, MPFR_RNDZ); 143 mpfr_set_decimal64 (x, d, MPFR_RNDD); 144 mpfr_set_str (y, "1E-397", 10, MPFR_RNDN); 145 ASSERT_ALWAYS (mpfr_cmp (x, y) == 0); 146 147 /* largest number */ 148 mpfr_set_str (x, "9.999999999999999E384", 10, MPFR_RNDZ); 149 mpfr_set (y, x, MPFR_RNDZ); 150 d = mpfr_get_decimal64 (x, MPFR_RNDU); 151 mpfr_set_ui (x, 0, MPFR_RNDZ); 152 mpfr_set_decimal64 (x, d, MPFR_RNDZ); 153 ASSERT_ALWAYS (mpfr_cmp (x, y) == 0); 154 155 mpfr_set_prec (x, 53); 156 mpfr_set_prec (y, 53); 157 158 /* largest number */ 159 mpfr_set_str (x, "9.999999999999999E384", 10, MPFR_RNDZ); 160 d = mpfr_get_decimal64 (x, MPFR_RNDZ); 161 mpfr_set_decimal64 (y, d, MPFR_RNDU); 162 ASSERT_ALWAYS (mpfr_cmp (x, y) == 0); 163 164 mpfr_clear (x); 165 mpfr_clear (y); 166} 167 168static void 169check_random (void) 170{ 171 mpfr_t x, y; 172 _Decimal64 d; 173 int i; 174 175 mpfr_init2 (x, 49); 176 mpfr_init2 (y, 49); 177 178 for (i = 0; i < 100000; i++) 179 { 180 mpfr_urandomb (x, RANDS); /* 0 <= x < 1 */ 181 /* the normal decimal64 range contains [2^(-1272), 2^1278] */ 182 mpfr_mul_2si (x, x, (i % 2550) - 1272, MPFR_RNDN); 183 if (mpfr_get_exp (x) <= -1272) 184 mpfr_mul_2exp (x, x, -1271 - mpfr_get_exp (x), MPFR_RNDN); 185 d = mpfr_get_decimal64 (x, MPFR_RNDN); 186 mpfr_set_decimal64 (y, d, MPFR_RNDN); 187 if (mpfr_cmp (x, y) != 0) 188 { 189 printf ("x="); mpfr_dump (x); 190 printf ("d="); print_decimal64 (d); 191 printf ("y="); mpfr_dump (y); 192 exit (1); 193 } 194 } 195 196 mpfr_clear (x); 197 mpfr_clear (y); 198} 199 200/* check with native decimal formats */ 201static void 202check_native (void) 203{ 204 mpfr_t x; 205 _Decimal64 d; 206 207 mpfr_init2 (x, 53); 208 209 /* check important constants are correctly converted */ 210 mpfr_set_ui (x, 17, MPFR_RNDN); 211 d = mpfr_get_decimal64 (x, MPFR_RNDN); 212 MPFR_ASSERTN(d == 17.0dd); 213 214 mpfr_set_ui (x, 42, MPFR_RNDN); 215 d = mpfr_get_decimal64 (x, MPFR_RNDN); 216 MPFR_ASSERTN(d == 42.0dd); 217 218 mpfr_set_decimal64 (x, 17.0dd, MPFR_RNDN); 219 MPFR_ASSERTN(mpfr_cmp_ui (x, 17) == 0); 220 221 mpfr_set_decimal64 (x, 42.0dd, MPFR_RNDN); 222 MPFR_ASSERTN(mpfr_cmp_ui (x, 42) == 0); 223 224 mpfr_clear (x); 225} 226#endif /* MPFR_WANT_DECIMAL_FLOATS */ 227 228int 229main (void) 230{ 231 tests_start_mpfr (); 232 mpfr_test_init (); 233 234#ifdef MPFR_WANT_DECIMAL_FLOATS 235#ifdef DEBUG 236#ifdef DPD_FORMAT 237 printf ("Using DPD format\n"); 238#else 239 printf ("Using BID format\n"); 240#endif 241#endif 242 check_inf_nan (); 243 check_random (); 244 check_native (); 245#endif 246 247 tests_end_mpfr (); 248 return 0; 249} 250