tsub_d.c revision 1.1.1.1
1/* Test file for mpfr_sub_d 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#include <float.h> 26 27#include "mpfr-test.h" 28 29#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0) 30 31static void 32check_nans (void) 33{ 34 mpfr_t x, y; 35 int inexact; 36 37 mpfr_init2 (x, 123); 38 mpfr_init2 (y, 123); 39 40 /* nan - 1.0 is nan */ 41 mpfr_set_nan (x); 42 mpfr_clear_flags (); 43 inexact = mpfr_sub_d (y, x, 1.0, MPFR_RNDN); 44 MPFR_ASSERTN (inexact == 0); 45 MPFR_ASSERTN ((__gmpfr_flags ^ MPFR_FLAGS_NAN) == 0); 46 MPFR_ASSERTN (mpfr_nan_p (y)); 47 48 /* +inf - 1.0 == +inf */ 49 mpfr_set_inf (x, 1); 50 mpfr_clear_flags (); 51 inexact = mpfr_sub_d (y, x, 1.0, MPFR_RNDN); 52 MPFR_ASSERTN (inexact == 0); 53 MPFR_ASSERTN (__gmpfr_flags == 0); 54 MPFR_ASSERTN (mpfr_inf_p (y)); 55 MPFR_ASSERTN (MPFR_IS_POS (y)); 56 57 /* -inf - 1.0 == -inf */ 58 mpfr_set_inf (x, -1); 59 mpfr_clear_flags (); 60 inexact = mpfr_sub_d (y, x, 1.0, MPFR_RNDN); 61 MPFR_ASSERTN (inexact == 0); 62 MPFR_ASSERTN (__gmpfr_flags == 0); 63 MPFR_ASSERTN (mpfr_inf_p (y)); 64 MPFR_ASSERTN (MPFR_IS_NEG (y)); 65 66 mpfr_clear (x); 67 mpfr_clear (y); 68} 69 70#define TEST_FUNCTION mpfr_sub_d 71#define DOUBLE_ARG2 72#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS) 73#include "tgeneric.c" 74 75int 76main (void) 77{ 78 mpfr_t x, y, z; 79 double d; 80 int inexact; 81 tests_start_mpfr (); 82 83 /* check with enough precision */ 84 mpfr_init2 (x, IEEE_DBL_MANT_DIG); 85 mpfr_init2 (y, IEEE_DBL_MANT_DIG); 86 mpfr_init2 (z, IEEE_DBL_MANT_DIG); 87 88 mpfr_set_str (y, "4096", 10, MPFR_RNDN); 89 d = 0.125; 90 mpfr_clear_flags (); 91 inexact = mpfr_sub_d (x, y, d, MPFR_RNDN); 92 if (inexact != 0) 93 { 94 printf ("Inexact flag error in mpfr_sub_d\n"); 95 exit (1); 96 } 97 mpfr_set_str (z, "4095.875", 10, MPFR_RNDN); 98 if (mpfr_cmp (z, x)) 99 { 100 printf ("Error in mpfr_sub_d ("); 101 mpfr_out_str (stdout, 10, 7, y, MPFR_RNDN); 102 printf (" + %.20g)\nexpected ", d); 103 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN); 104 printf ("\ngot "); 105 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); 106 printf ("\n"); 107 exit (1); 108 } 109 mpfr_clears (x, y, z, (mpfr_ptr) 0); 110 111 check_nans (); 112 113 test_generic (2, 1000, 100); 114 115 tests_end_mpfr (); 116 return 0; 117} 118 119#else 120 121int 122main (void) 123{ 124 printf ("Warning! Test disabled for this MPFR version.\n"); 125 return 0; 126} 127 128#endif 129