1/* Test file for mpfr_nextabove, mpfr_nextbelow, mpfr_nexttoward. 2 3Copyright 2003, 2004, 2005, 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 <stdio.h> 24#include <stdlib.h> 25 26#include "mpfr-test.h" 27 28/* Generic tests for mpfr_nextabove and mpfr_nextbelow */ 29static void 30generic_abovebelow (void) 31{ 32 int i; 33 34 for (i = 0; i < 20000; i++) 35 { 36 mpfr_t x, y, z, t; 37 mpfr_prec_t prec; 38 int neg, below; 39 40 prec = (randlimb () % 300) + MPFR_PREC_MIN; 41 mpfr_inits2 (prec, x, y, z, (mpfr_ptr) 0); 42 mpfr_init2 (t, 3); 43 44 /* special tests (executed once is enough) */ 45 if (i == 0) 46 { 47 mpfr_set_nan (x); 48 mpfr_nextabove (x); 49 MPFR_ASSERTN(mpfr_nan_p (x)); 50 mpfr_nextbelow (x); 51 MPFR_ASSERTN(mpfr_nan_p (x)); 52 mpfr_nexttoward (x, y); 53 MPFR_ASSERTN(mpfr_nan_p (x)); 54 mpfr_set_ui (y, 1, MPFR_RNDN); 55 mpfr_nexttoward (y, x); 56 MPFR_ASSERTN(mpfr_nan_p (y)); 57 mpfr_set_ui (x, 1, MPFR_RNDN); 58 mpfr_set_ui (y, 1, MPFR_RNDN); 59 mpfr_nexttoward (x, y); 60 MPFR_ASSERTN(mpfr_cmp_ui (x, 1) == 0); 61 } 62 63 do 64 mpfr_urandomb (x, RANDS); 65 while (mpfr_cmp_ui (x, 0) == 0); 66 neg = randlimb () & 1; 67 if (neg) 68 mpfr_neg (x, x, MPFR_RNDN); 69 mpfr_set (y, x, MPFR_RNDN); 70 below = randlimb () & 1; 71 if (below) 72 mpfr_nextbelow (y); 73 else 74 mpfr_nextabove (y); 75 mpfr_set_si (t, below ? -5 : 5, MPFR_RNDN); 76 mpfr_mul_2si (t, t, (mpfr_get_exp) (x) - prec - 3, MPFR_RNDN); 77 /* t = (1/2 + 1/8) ulp(x) */ 78 mpfr_add (z, x, t, MPFR_RNDN); 79 if (!mpfr_number_p (y) || mpfr_cmp (y, z) != 0) 80 { 81 printf ("Error in mpfr_next%s for\n", 82 below ? "below" : "above"); 83 mpfr_out_str (stdout, 2, 0, x, MPFR_RNDN); 84 printf (", got\n"); 85 mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN); 86 printf (" instead of\n"); 87 mpfr_out_str (stdout, 2, 0, z, MPFR_RNDN); 88 printf ("\n"); 89 exit (1); 90 } 91 mpfr_clears (x, y, z, t, (mpfr_ptr) 0); 92 } 93} 94 95static void 96inverse_test (void) 97{ 98 static const char *tests[] = { "0", "1", "2", "3.1", "Inf" }; 99 int i, neg, below; 100 mpfr_prec_t prec; 101 102 for (i = 0; i < (int) (sizeof(tests) / sizeof(tests[0])); i++) 103 for (neg = 0; neg <= 1; neg++) 104 for (below = 0; below <= 1; below++) 105 for (prec = MPFR_PREC_MIN; prec < 200; prec += 3) 106 { 107 mpfr_t x, y; 108 int sign; 109 110 mpfr_inits2 (prec, x, y, (mpfr_ptr) 0); 111 mpfr_set_str (x, tests[i], 10, MPFR_RNDN); 112 if (neg) 113 mpfr_neg (x, x, MPFR_RNDN); 114 mpfr_set (y, x, MPFR_RNDN); 115 if (below) 116 mpfr_nextbelow (y); 117 else 118 mpfr_nextabove (y); 119 sign = MPFR_SIGN (y); 120 if (!(neg == below && mpfr_inf_p (x))) /* then x = y */ 121 { 122 if (mpfr_cmp (x, y) == 0) 123 { 124 printf ("Error in inverse_test for %s, neg = %d," 125 " below = %d, prec = %d: x = y", tests[i], 126 neg, below, (int) prec); 127 printf ("\nx = "); 128 mpfr_out_str (stdout, 2, 0, x, MPFR_RNDN); 129 printf ("\ny = "); 130 mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN); 131 printf ("\n"); 132 exit (1); 133 } 134 mpfr_nexttoward (y, x); 135 if (mpfr_cmp_ui (y, 0) == 0 && MPFR_SIGN (y) != sign) 136 { 137 printf ("Sign error in inverse_test for %s, neg = %d," 138 " below = %d, prec = %d\n", tests[i], neg, 139 below, (int) prec); 140 mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN); 141 printf ("\n"); 142 exit (1); 143 } 144 } 145 if (mpfr_cmp (x, y) != 0) 146 { 147 printf ("Error in inverse_test for %s, neg = %d, below = %d," 148 " prec = %d", tests[i], neg, below, (int) prec); 149 printf ("\nx = "); 150 mpfr_out_str (stdout, 2, 0, x, MPFR_RNDN); 151 printf ("\ny = "); 152 mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN); 153 printf ("\n"); 154 exit (1); 155 } 156 mpfr_clears (x, y, (mpfr_ptr) 0); 157 } 158} 159 160int 161main (void) 162{ 163 tests_start_mpfr (); 164 generic_abovebelow (); 165 inverse_test (); 166 tests_end_mpfr (); 167 return 0; 168} 169