1 /* Test file for mpfr_eq. 2 3 Copyright 1999-2016 Free Software Foundation, Inc. 4 Contributed by the AriC and Caramba projects, INRIA. 5 6 This file is part of the GNU MPFR Library. 7 8 The GNU MPFR Library is free software; you can redistribute it and/or modify 9 it under the terms of the GNU Lesser General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or (at your 11 option) any later version. 12 13 The GNU MPFR Library is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 License for more details. 17 18 You should have received a copy of the GNU Lesser General Public License 19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23 #include <stdio.h> 24 #include <stdlib.h> 25 26 #include "mpfr-test.h" 27 28 static void 29 teq (mpfr_t x) 30 { 31 mpfr_t y; 32 unsigned long k, px, mx; 33 34 mpfr_init2 (y, MPFR_PREC(x)); 35 36 mx = (MPFR_PREC(x) - 1) / mp_bits_per_limb; 37 px = mp_bits_per_limb - 2; 38 39 for (k = 2; k < MPFR_PREC(x); k++) 40 { 41 mpfr_set (y, x, MPFR_RNDN); 42 43 MPFR_MANT(y) [mx] ^= (mp_limb_t) 1 << px; 44 45 if (mpfr_eq(y, x, k) || !mpfr_eq(y, x, k - 1)) 46 { 47 printf ("Error in eq.\n"); 48 printf ("x = "); mpfr_print_binary (x); printf ("\n"); 49 printf ("y = "); mpfr_print_binary (y); printf ("\n"); 50 printf ("k = %lu\n", k); 51 printf ("mpfr_eq(y, x, k) = %d\nmpfr_eq(y, x, k - 1) = %d\n", 52 mpfr_eq (y, x, k), mpfr_eq (y, x, k - 1)); 53 exit (1); 54 } 55 56 if (px) 57 { 58 --px; 59 } 60 else 61 { 62 --mx; 63 px = mp_bits_per_limb - 1; 64 } 65 } 66 mpfr_clear (y); 67 } 68 69 static void 70 special (void) 71 { 72 mpfr_t x, y, z; 73 int i, error = 0; 74 75 mpfr_init2 (x, 53); 76 mpfr_init2 (y, 53); 77 mpfr_init2 (z, 53); 78 79 mpfr_set_str (x, "1", 10, (mpfr_rnd_t) 0); 80 mpfr_set_str (y, "1e-10000", 10, (mpfr_rnd_t) 0); 81 mpfr_add (z, x, y, MPFR_RNDU); 82 83 for (i = 1; i <= 52; i++) 84 if (mpfr_eq (x, z, i) == 0) 85 error = 1; 86 for (i = 53; i <= 100; i++) 87 if (mpfr_eq (x, z, i) != 0) 88 error = 1; 89 if (mpfr_eq (x, z, 1000) != 0) 90 error = 1; 91 92 if (error) 93 { 94 printf ("Error in mpfr_eq (1, 1+1e-1000)\n"); 95 exit (1); 96 } 97 98 mpfr_set_nan (x); 99 mpfr_set_nan (y); 100 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 101 102 mpfr_set_inf (y, 1); 103 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 104 105 mpfr_set_ui (y, 0, MPFR_RNDN); 106 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 107 108 mpfr_set_inf (x, 1); 109 mpfr_set_inf (y, 1); 110 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 111 112 mpfr_set_inf (x, 1); 113 mpfr_set_inf (y, -1); 114 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 115 116 mpfr_set_inf (x, -1); 117 mpfr_set_inf (y, -1); 118 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 119 120 mpfr_set_inf (x, 1); 121 mpfr_set_ui (y, 0, MPFR_RNDN); 122 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 123 124 mpfr_set_ui (x, 1, MPFR_RNDN); 125 mpfr_set_ui (y, 0, MPFR_RNDN); 126 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 127 MPFR_ASSERTN(mpfr_eq (y, x, 1) == 0); 128 129 mpfr_set_ui (x, 0, MPFR_RNDN); 130 mpfr_set_ui (y, 0, MPFR_RNDN); 131 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 132 133 mpfr_neg (y, y, MPFR_RNDN); 134 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 135 136 mpfr_neg (x, x, MPFR_RNDN); 137 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 138 139 mpfr_set_ui (x, 1, MPFR_RNDN); 140 mpfr_neg (y, x, MPFR_RNDN); 141 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 142 143 mpfr_set_prec (x, 2 * mp_bits_per_limb); 144 mpfr_set_prec (y, mp_bits_per_limb); 145 mpfr_set_ui (x, 1, MPFR_RNDN); 146 mpfr_set_ui (y, 1, MPFR_RNDN); 147 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb - 1)); 148 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb)); 149 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb + 1)); 150 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb - 1)); 151 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb)); 152 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb + 1)); 153 154 mpfr_nextabove (x); 155 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb - 1)); 156 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb)); 157 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb + 1)); 158 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb - 1)); 159 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb) == 0); 160 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb + 1) == 0); 161 MPFR_ASSERTN(mpfr_eq (y, x, mp_bits_per_limb - 1)); 162 MPFR_ASSERTN(mpfr_eq (y, x, mp_bits_per_limb)); 163 MPFR_ASSERTN(mpfr_eq (y, x, mp_bits_per_limb + 1)); 164 MPFR_ASSERTN(mpfr_eq (y, x, 2 * mp_bits_per_limb - 1)); 165 MPFR_ASSERTN(mpfr_eq (y, x, 2 * mp_bits_per_limb) == 0); 166 MPFR_ASSERTN(mpfr_eq (y, x, 2 * mp_bits_per_limb + 1) == 0); 167 168 mpfr_set_ui (x, 1, MPFR_RNDN); 169 mpfr_set_ui (y, 2, MPFR_RNDN); 170 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 171 172 mpfr_set_prec (x, 2 * mp_bits_per_limb); 173 mpfr_set_prec (y, 2 * mp_bits_per_limb); 174 mpfr_set_ui (x, 2, MPFR_RNDN); 175 mpfr_set_ui (y, 3, MPFR_RNDN); 176 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 177 MPFR_ASSERTN(mpfr_eq (x, y, 2) == 0); 178 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb) == 0); 179 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb + 1) == 0); 180 181 mpfr_clear (x); 182 mpfr_clear (y); 183 mpfr_clear (z); 184 } 185 186 int 187 main (void) 188 { 189 int j; 190 mpfr_t x; 191 192 tests_start_mpfr (); 193 194 special (); 195 196 mpfr_init2 (x, 500); 197 198 for (j = 0; j < 500; j++) 199 { 200 mpfr_urandomb (x, RANDS); 201 teq (x); 202 } 203 204 mpfr_clear (x); 205 206 tests_end_mpfr (); 207 return 0; 208 } 209