1/* Test file for mpfr_modf. 2 3Copyright 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 26#include "mpfr-test.h" 27 28#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0) 29 30static void 31check (const char *xis, const char *xfs, const char *xs, 32 mpfr_prec_t xip, mpfr_prec_t xfp, mpfr_prec_t xp, 33 int expected_return, mpfr_rnd_t rnd_mode) 34{ 35 int inexact; 36 mpfr_t xi, xf, x; 37 38 mpfr_init2 (xi, xip); 39 mpfr_init2 (xf, xfp); 40 mpfr_init2 (x, xp); 41 mpfr_set_str1 (x, xs); 42 inexact = mpfr_modf (xi, xf, x, rnd_mode); 43 if (mpfr_cmp_str1 (xi, xis)) 44 { 45 printf ("mpfr_modf failed for x=%s, rnd=%s\n", 46 xs, mpfr_print_rnd_mode(rnd_mode)); 47 printf ("got integer value: "); 48 mpfr_out_str (stdout, 10, 0, xi, MPFR_RNDN); 49 printf ("\nexpected %s\n", xis); 50 exit (1); 51 } 52 if (mpfr_cmp_str1 (xf, xfs)) 53 { 54 printf ("mpfr_modf failed for x=%s, rnd=%s\n", 55 xs, mpfr_print_rnd_mode(rnd_mode)); 56 printf ("got fractional value: "); 57 mpfr_out_str (stdout, 10, 0, xf, MPFR_RNDN); 58 printf ("\nexpected %s\n", xfs); 59 exit (1); 60 } 61 if (inexact != expected_return) 62 { 63 printf ("mpfr_modf failed for x=%s, rnd=%s\n", 64 xs, mpfr_print_rnd_mode(rnd_mode)); 65 printf ("got return value: %d, expected %d\n", inexact, expected_return); 66 exit (1); 67 } 68 mpfr_clears (xi, xf, x, (mpfr_ptr) 0); 69} 70 71static void 72check_nans (void) 73{ 74 mpfr_t x, xi, xf; 75 76 mpfr_init2 (x, 123); 77 mpfr_init2 (xi, 123); 78 mpfr_init2 (xf, 123); 79 80 /* nan */ 81 mpfr_set_nan (x); 82 mpfr_modf (xi, xf, x, MPFR_RNDN); 83 MPFR_ASSERTN (mpfr_nan_p (xi)); 84 MPFR_ASSERTN (mpfr_nan_p (xf)); 85 86 /* +inf */ 87 mpfr_set_inf (x, 1); 88 mpfr_modf (xi, xf, x, MPFR_RNDN); 89 MPFR_ASSERTN (mpfr_inf_p (xi)); 90 MPFR_ASSERTN (mpfr_sgn (xi) > 0); 91 MPFR_ASSERTN (mpfr_zero_p (xf)); 92 93 /* -inf */ 94 mpfr_set_inf (x, -1); 95 mpfr_modf (xi ,xf, x, MPFR_RNDN); 96 MPFR_ASSERTN (mpfr_inf_p (xi)); 97 MPFR_ASSERTN (mpfr_sgn (xi) < 0); 98 MPFR_ASSERTN (mpfr_zero_p (xf)); 99 100 mpfr_clear (x); 101 mpfr_clear (xi); 102 mpfr_clear (xf); 103} 104 105static void 106check_special_exprange (void) 107{ 108 int inexact, ov; 109 unsigned int eflags, gflags; 110 mpfr_t xi, xf, x; 111 mpfr_exp_t emax; 112 113 emax = mpfr_get_emax (); 114 mpfr_init2 (xi, 7); 115 mpfr_init2 (xf, 7); 116 mpfr_init2 (x, 8); 117 118 mpfr_set_str (x, "0.11111111", 2, MPFR_RNDN); 119 for (ov = 0; ov <= 1; ov++) 120 { 121 const char *s = ov ? "@Inf@" : "1"; 122 123 if (ov) 124 set_emax (0); 125 mpfr_clear_flags (); 126 inexact = mpfr_modf (xi, xf, x, MPFR_RNDN); 127 gflags = __gmpfr_flags; 128 set_emax (emax); 129 if (MPFR_NOTZERO (xi) || MPFR_IS_NEG (xi) || 130 mpfr_cmp_str1 (xf, s) != 0) 131 { 132 printf ("Error in check_special_exprange (ov = %d):" 133 " expected 0 and %s, got\n", ov, s); 134 mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN); 135 printf (" and "); 136 mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN); 137 printf ("\n"); 138 exit (1); 139 } 140 if (inexact != 4) 141 { 142 printf ("Bad inexact value in check_special_exprange (ov = %d):" 143 " expected 4, got %d\n", ov, inexact); 144 exit (1); 145 } 146 eflags = MPFR_FLAGS_INEXACT | (ov ? MPFR_FLAGS_OVERFLOW : 0); 147 if (gflags != eflags) 148 { 149 printf ("Bad flags in check_special_exprange (ov = %d):" 150 " expected %u, got %u\n", ov, eflags, gflags); 151 exit (1); 152 } 153 } 154 155 /* Test if an overflow occurs in mpfr_set for ope >= opq. */ 156 mpfr_set_emax (MPFR_EMAX_MAX); 157 mpfr_set_inf (x, 1); 158 mpfr_nextbelow (x); 159 mpfr_clear_flags (); 160 inexact = mpfr_modf (xi, xf, x, MPFR_RNDN); 161 gflags = __gmpfr_flags; 162 if (mpfr_cmp_str1 (xi, "@Inf@") != 0 || 163 MPFR_NOTZERO (xf) || MPFR_IS_NEG (xf)) 164 { 165 printf ("Error in check_special_exprange:" 166 " expected 0 and @Inf@, got\n"); 167 mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN); 168 printf (" and "); 169 mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN); 170 printf ("\n"); 171 exit (1); 172 } 173 if (inexact != 1) 174 { 175 printf ("Bad inexact value in check_special_exprange:" 176 " expected 1, got %d\n", inexact); 177 exit (1); 178 } 179 eflags = MPFR_FLAGS_INEXACT | MPFR_FLAGS_OVERFLOW; 180 if (gflags != eflags) 181 { 182 printf ("Bad flags in check_special_exprange:" 183 " expected %u, got %u\n", eflags, gflags); 184 exit (1); 185 } 186 set_emax (emax); 187 188 /* Test if an underflow occurs in the general case. TODO */ 189 190 mpfr_clears (xi, xf, x, (mpfr_ptr) 0); 191} 192 193int 194main (int argc, char *argv[]) 195{ 196 tests_start_mpfr (); 197 198 check_nans (); 199 200 /* integer part is exact, frac. part is exact: return value should be 0 */ 201 check ("61680","3.52935791015625e-1", "61680.352935791015625", 202 53, 53, 53, 0, MPFR_RNDZ); 203 /* integer part is rounded up, fractional part is rounded up: return value 204 should be 1+4*1=5 */ 205 check ("-53968","-3.529052734375e-1", "-53970.352935791015625", 206 13, 13, 53, 5, MPFR_RNDZ); 207 /* integer part is rounded down, fractional part is rounded down: 208 return value should be 2+4*2=10 */ 209 check ("61632","3.525390625e-1", "61648.352935791015625", 210 10, 10, 53, 10, MPFR_RNDZ); 211 check ("61680", "0", "61680", 53, 53, 53, 0, MPFR_RNDZ); 212 /* integer part is rounded up, fractional part is exact: 1 */ 213 check ("-53968","0", "-53970", 13, 13, 53, 1, MPFR_RNDZ); 214 /* integer part is rounded up, fractional part is exact: 1 */ 215 check ("-43392","0", "-43399", 13, 13, 53, 1, MPFR_RNDU); 216 /* integer part is rounded down, fractional part is exact: 2 */ 217 check ("-52720","0", "-52719", 13, 13, 53, 2, MPFR_RNDD); 218 /* integer part is rounded down, fractional part is exact: 2 */ 219 check ("61632", "0", "61648", 10, 10, 53, 2, MPFR_RNDZ); 220 221 check_special_exprange (); 222 223 tests_end_mpfr (); 224 return 0; 225} 226 227#else 228 229int 230main (void) 231{ 232 printf ("Warning! Test disabled for this MPFR version.\n"); 233 return 0; 234} 235 236#endif 237