1 /* Test file for mpfr_eq. 2 3 Copyright 1999-2023 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 https://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 "mpfr-test.h" 24 25 static void 26 teq (mpfr_ptr x) 27 { 28 mpfr_t y; 29 unsigned long k, px, mx; 30 31 mpfr_init2 (y, MPFR_PREC(x)); 32 33 mx = (MPFR_PREC(x) - 1) / mp_bits_per_limb; 34 px = mp_bits_per_limb - 2; 35 36 for (k = 2; k < MPFR_PREC(x); k++) 37 { 38 mpfr_set (y, x, MPFR_RNDN); 39 40 MPFR_MANT(y) [mx] ^= MPFR_LIMB_ONE << px; 41 42 if (mpfr_eq(y, x, k) || !mpfr_eq(y, x, k - 1)) 43 { 44 printf ("Error in eq.\n"); 45 printf ("x = "); mpfr_dump (x); 46 printf ("y = "); mpfr_dump (y); 47 printf ("k = %lu\n", k); 48 printf ("mpfr_eq(y, x, k) = %d\nmpfr_eq(y, x, k - 1) = %d\n", 49 mpfr_eq (y, x, k), mpfr_eq (y, x, k - 1)); 50 exit (1); 51 } 52 53 if (px) 54 { 55 --px; 56 } 57 else 58 { 59 --mx; 60 px = mp_bits_per_limb - 1; 61 } 62 } 63 mpfr_clear (y); 64 } 65 66 static void 67 special (void) 68 { 69 mpfr_t x, y, z; 70 int i, error = 0; 71 72 mpfr_init2 (x, 53); 73 mpfr_init2 (y, 53); 74 mpfr_init2 (z, 53); 75 76 mpfr_set_str (x, "1", 10, (mpfr_rnd_t) 0); 77 mpfr_set_str (y, "1e-10000", 10, (mpfr_rnd_t) 0); 78 mpfr_add (z, x, y, MPFR_RNDU); 79 80 for (i = 1; i <= 52; i++) 81 if (mpfr_eq (x, z, i) == 0) 82 error = 1; 83 for (i = 53; i <= 100; i++) 84 if (mpfr_eq (x, z, i) != 0) 85 error = 1; 86 if (mpfr_eq (x, z, 1000) != 0) 87 error = 1; 88 89 if (error) 90 { 91 printf ("Error in mpfr_eq (1, 1+1e-1000)\n"); 92 exit (1); 93 } 94 95 mpfr_set_nan (x); 96 mpfr_set_nan (y); 97 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 98 99 mpfr_set_inf (y, 1); 100 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 101 102 mpfr_set_ui (y, 0, MPFR_RNDN); 103 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 104 105 mpfr_set_inf (x, 1); 106 mpfr_set_inf (y, 1); 107 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 108 109 mpfr_set_inf (x, 1); 110 mpfr_set_inf (y, -1); 111 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 112 113 mpfr_set_inf (x, -1); 114 mpfr_set_inf (y, -1); 115 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 116 117 mpfr_set_inf (x, 1); 118 mpfr_set_ui (y, 0, MPFR_RNDN); 119 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 120 121 mpfr_set_ui (x, 1, MPFR_RNDN); 122 mpfr_set_ui (y, 0, MPFR_RNDN); 123 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 124 MPFR_ASSERTN(mpfr_eq (y, x, 1) == 0); 125 126 mpfr_set_ui (x, 0, MPFR_RNDN); 127 mpfr_set_ui (y, 0, MPFR_RNDN); 128 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 129 130 mpfr_neg (y, y, MPFR_RNDN); 131 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 132 133 mpfr_neg (x, x, MPFR_RNDN); 134 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 135 136 mpfr_set_ui (x, 1, MPFR_RNDN); 137 mpfr_neg (y, x, MPFR_RNDN); 138 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 139 140 mpfr_set_prec (x, 2 * mp_bits_per_limb); 141 mpfr_set_prec (y, mp_bits_per_limb); 142 mpfr_set_ui (x, 1, MPFR_RNDN); 143 mpfr_set_ui (y, 1, MPFR_RNDN); 144 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb - 1)); 145 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb)); 146 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb + 1)); 147 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb - 1)); 148 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb)); 149 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb + 1)); 150 151 mpfr_nextabove (x); 152 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb - 1)); 153 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb)); 154 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb + 1)); 155 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb - 1)); 156 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb) == 0); 157 MPFR_ASSERTN(mpfr_eq (x, y, 2 * mp_bits_per_limb + 1) == 0); 158 MPFR_ASSERTN(mpfr_eq (y, x, mp_bits_per_limb - 1)); 159 MPFR_ASSERTN(mpfr_eq (y, x, mp_bits_per_limb)); 160 MPFR_ASSERTN(mpfr_eq (y, x, mp_bits_per_limb + 1)); 161 MPFR_ASSERTN(mpfr_eq (y, x, 2 * mp_bits_per_limb - 1)); 162 MPFR_ASSERTN(mpfr_eq (y, x, 2 * mp_bits_per_limb) == 0); 163 MPFR_ASSERTN(mpfr_eq (y, x, 2 * mp_bits_per_limb + 1) == 0); 164 165 mpfr_set_ui (x, 1, MPFR_RNDN); 166 mpfr_set_ui (y, 2, MPFR_RNDN); 167 MPFR_ASSERTN(mpfr_eq (x, y, 1) == 0); 168 169 mpfr_set_prec (x, 2 * mp_bits_per_limb); 170 mpfr_set_prec (y, 2 * mp_bits_per_limb); 171 mpfr_set_ui (x, 2, MPFR_RNDN); 172 mpfr_set_ui (y, 3, MPFR_RNDN); 173 MPFR_ASSERTN(mpfr_eq (x, y, 1)); 174 MPFR_ASSERTN(mpfr_eq (x, y, 2) == 0); 175 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb) == 0); 176 MPFR_ASSERTN(mpfr_eq (x, y, mp_bits_per_limb + 1) == 0); 177 178 mpfr_clear (x); 179 mpfr_clear (y); 180 mpfr_clear (z); 181 } 182 183 int 184 main (void) 185 { 186 int j; 187 mpfr_t x; 188 189 tests_start_mpfr (); 190 191 special (); 192 193 mpfr_init2 (x, 500); 194 195 for (j = 0; j < 500; j++) 196 { 197 mpfr_urandomb (x, RANDS); 198 teq (x); 199 } 200 201 mpfr_clear (x); 202 203 tests_end_mpfr (); 204 return 0; 205 } 206
Indexes created Sun Aug 30 00:27:18 UTC 2026