1/* Test file for mpfr_modf. 2 3Copyright 2007-2023 Free Software Foundation, Inc. 4Contributed by the AriC and Caramba 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 20https://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 "mpfr-test.h" 24 25static void 26check (const char *xis, const char *xfs, const char *xs, 27 mpfr_prec_t xip, mpfr_prec_t xfp, mpfr_prec_t xp, 28 int expected_return, mpfr_rnd_t rnd_mode) 29{ 30 int inexact; 31 mpfr_t xi, xf, x; 32 33 mpfr_init2 (xi, xip); 34 mpfr_init2 (xf, xfp); 35 mpfr_init2 (x, xp); 36 mpfr_set_str1 (x, xs); 37 inexact = mpfr_modf (xi, xf, x, rnd_mode); 38 if (mpfr_cmp_str1 (xi, xis)) 39 { 40 printf ("mpfr_modf failed for x=%s, rnd=%s\n", 41 xs, mpfr_print_rnd_mode(rnd_mode)); 42 printf ("got integer value: "); 43 mpfr_out_str (stdout, 10, 0, xi, MPFR_RNDN); 44 printf ("\nexpected %s\n", xis); 45 exit (1); 46 } 47 if (mpfr_cmp_str1 (xf, xfs)) 48 { 49 printf ("mpfr_modf failed for x=%s, rnd=%s\n", 50 xs, mpfr_print_rnd_mode(rnd_mode)); 51 printf ("got fractional value: "); 52 mpfr_out_str (stdout, 10, 0, xf, MPFR_RNDN); 53 printf ("\nexpected %s\n", xfs); 54 exit (1); 55 } 56 if (inexact != expected_return) 57 { 58 printf ("mpfr_modf failed for x=%s, rnd=%s\n", 59 xs, mpfr_print_rnd_mode(rnd_mode)); 60 printf ("got return value: %d, expected %d\n", inexact, expected_return); 61 exit (1); 62 } 63 mpfr_clears (xi, xf, x, (mpfr_ptr) 0); 64} 65 66static void 67check_nans (void) 68{ 69 mpfr_t x, xi, xf; 70 71 mpfr_init2 (x, 123); 72 mpfr_init2 (xi, 123); 73 mpfr_init2 (xf, 123); 74 75 /* nan */ 76 mpfr_set_nan (x); 77 mpfr_modf (xi, xf, x, MPFR_RNDN); 78 MPFR_ASSERTN (mpfr_nan_p (xi)); 79 MPFR_ASSERTN (mpfr_nan_p (xf)); 80 81 /* +inf */ 82 mpfr_set_inf (x, 1); 83 mpfr_modf (xi, xf, x, MPFR_RNDN); 84 MPFR_ASSERTN (mpfr_inf_p (xi)); 85 MPFR_ASSERTN (mpfr_sgn (xi) > 0); 86 MPFR_ASSERTN (mpfr_zero_p (xf)); 87 88 /* -inf */ 89 mpfr_set_inf (x, -1); 90 mpfr_modf (xi, xf, x, MPFR_RNDN); 91 MPFR_ASSERTN (mpfr_inf_p (xi)); 92 MPFR_ASSERTN (mpfr_sgn (xi) < 0); 93 MPFR_ASSERTN (mpfr_zero_p (xf)); 94 95 mpfr_clear (x); 96 mpfr_clear (xi); 97 mpfr_clear (xf); 98} 99 100static void 101check_special_exprange (void) 102{ 103 int inexact, ov; 104 unsigned int eflags, gflags; 105 mpfr_t xi, xf, x; 106 mpfr_exp_t emax; 107 108 emax = mpfr_get_emax (); 109 mpfr_init2 (xi, 7); 110 mpfr_init2 (xf, 7); 111 mpfr_init2 (x, 8); 112 113 mpfr_set_str (x, "0.11111111", 2, MPFR_RNDN); 114 for (ov = 0; ov <= 1; ov++) 115 { 116 const char *s = ov ? "@Inf@" : "1"; 117 118 if (ov) 119 set_emax (0); 120 mpfr_clear_flags (); 121 inexact = mpfr_modf (xi, xf, x, MPFR_RNDN); 122 gflags = __gmpfr_flags; 123 set_emax (emax); 124 if (MPFR_NOTZERO (xi) || MPFR_IS_NEG (xi) || 125 mpfr_cmp_str1 (xf, s) != 0) 126 { 127 printf ("Error in check_special_exprange (ov = %d):" 128 " expected 0 and %s, got\n", ov, s); 129 mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN); 130 printf (" and "); 131 mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN); 132 printf ("\n"); 133 exit (1); 134 } 135 if (inexact != 4) 136 { 137 printf ("Bad inexact value in check_special_exprange (ov = %d):" 138 " expected 4, got %d\n", ov, inexact); 139 exit (1); 140 } 141 eflags = MPFR_FLAGS_INEXACT | (ov ? MPFR_FLAGS_OVERFLOW : 0); 142 if (gflags != eflags) 143 { 144 printf ("Bad flags in check_special_exprange (ov = %d):" 145 " expected %u, got %u\n", ov, eflags, gflags); 146 exit (1); 147 } 148 } 149 150 /* Test if an overflow occurs in mpfr_set for ope >= opq. */ 151 set_emax (MPFR_EMAX_MAX); 152 mpfr_set_inf (x, 1); 153 mpfr_nextbelow (x); 154 mpfr_clear_flags (); 155 inexact = mpfr_modf (xi, xf, x, MPFR_RNDN); 156 gflags = __gmpfr_flags; 157 if (mpfr_cmp_str1 (xi, "@Inf@") != 0 || 158 MPFR_NOTZERO (xf) || MPFR_IS_NEG (xf)) 159 { 160 printf ("Error in check_special_exprange:" 161 " expected 0 and @Inf@, got\n"); 162 mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN); 163 printf (" and "); 164 mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN); 165 printf ("\n"); 166 exit (1); 167 } 168 if (inexact != 1) 169 { 170 printf ("Bad inexact value in check_special_exprange:" 171 " expected 1, got %d\n", inexact); 172 exit (1); 173 } 174 eflags = MPFR_FLAGS_INEXACT | MPFR_FLAGS_OVERFLOW; 175 if (gflags != eflags) 176 { 177 printf ("Bad flags in check_special_exprange:" 178 " expected %u, got %u\n", eflags, gflags); 179 exit (1); 180 } 181 set_emax (emax); 182 183 /* Test if an underflow occurs in the general case. TODO */ 184 185 mpfr_clears (xi, xf, x, (mpfr_ptr) 0); 186} 187 188int 189main (int argc, char *argv[]) 190{ 191 tests_start_mpfr (); 192 193 check_nans (); 194 195 /* integer part is exact, frac. part is exact: return value should be 0 */ 196 check ("61680","3.52935791015625e-1", "61680.352935791015625", 197 53, 53, 53, 0, MPFR_RNDZ); 198 /* integer part is rounded up, fractional part is rounded up: return value 199 should be 1+4*1=5 */ 200 check ("-53968","-3.529052734375e-1", "-53970.352935791015625", 201 13, 13, 53, 5, MPFR_RNDZ); 202 /* integer part is rounded down, fractional part is rounded down: 203 return value should be 2+4*2=10 */ 204 check ("61632","3.525390625e-1", "61648.352935791015625", 205 10, 10, 53, 10, MPFR_RNDZ); 206 check ("61680", "0", "61680", 53, 53, 53, 0, MPFR_RNDZ); 207 /* integer part is rounded up, fractional part is exact: 1 */ 208 check ("-53968","0", "-53970", 13, 13, 53, 1, MPFR_RNDZ); 209 /* integer part is rounded up, fractional part is exact: 1 */ 210 check ("-43392","0", "-43399", 13, 13, 53, 1, MPFR_RNDU); 211 /* integer part is rounded down, fractional part is exact: 2 */ 212 check ("-52720","0", "-52719", 13, 13, 53, 2, MPFR_RNDD); 213 /* integer part is rounded down, fractional part is exact: 2 */ 214 check ("61632", "0", "61648", 10, 10, 53, 2, MPFR_RNDZ); 215 216 check_special_exprange (); 217 218 tests_end_mpfr (); 219 return 0; 220} 221