tsub_d.c revision 1.1.1.6
1/* Test file for mpfr_sub_d 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 <float.h> 24 25#include "mpfr-test.h" 26 27static void 28check_nans (void) 29{ 30 mpfr_t x, y; 31 int inexact; 32 33 mpfr_init2 (x, 123); 34 mpfr_init2 (y, 123); 35 36 /* nan - 1.0 is nan */ 37 mpfr_set_nan (x); 38 mpfr_clear_flags (); 39 inexact = mpfr_sub_d (y, x, 1.0, MPFR_RNDN); 40 MPFR_ASSERTN (inexact == 0); 41 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN); 42 MPFR_ASSERTN (mpfr_nan_p (y)); 43 44 /* +inf - 1.0 == +inf */ 45 mpfr_set_inf (x, 1); 46 mpfr_clear_flags (); 47 inexact = mpfr_sub_d (y, x, 1.0, MPFR_RNDN); 48 MPFR_ASSERTN (inexact == 0); 49 MPFR_ASSERTN (__gmpfr_flags == 0); 50 MPFR_ASSERTN (mpfr_inf_p (y)); 51 MPFR_ASSERTN (MPFR_IS_POS (y)); 52 53 /* -inf - 1.0 == -inf */ 54 mpfr_set_inf (x, -1); 55 mpfr_clear_flags (); 56 inexact = mpfr_sub_d (y, x, 1.0, MPFR_RNDN); 57 MPFR_ASSERTN (inexact == 0); 58 MPFR_ASSERTN (__gmpfr_flags == 0); 59 MPFR_ASSERTN (mpfr_inf_p (y)); 60 MPFR_ASSERTN (MPFR_IS_NEG (y)); 61 62 mpfr_clear (x); 63 mpfr_clear (y); 64} 65 66#define TEST_FUNCTION mpfr_sub_d 67#define DOUBLE_ARG2 68#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS) 69#include "tgeneric.c" 70 71int 72main (void) 73{ 74 mpfr_t x, y, z; 75 double d; 76 int inexact; 77 78 tests_start_mpfr (); 79 80 /* check with enough precision */ 81 mpfr_init2 (x, IEEE_DBL_MANT_DIG); 82 mpfr_init2 (y, IEEE_DBL_MANT_DIG); 83 mpfr_init2 (z, IEEE_DBL_MANT_DIG); 84 85 mpfr_set_str (y, "4096", 10, MPFR_RNDN); 86 d = 0.125; 87 mpfr_clear_flags (); 88 inexact = mpfr_sub_d (x, y, d, MPFR_RNDN); 89 if (inexact != 0) 90 { 91 printf ("Inexact flag error in mpfr_sub_d\n"); 92 exit (1); 93 } 94 mpfr_set_str (z, "4095.875", 10, MPFR_RNDN); 95 if (mpfr_cmp (z, x)) 96 { 97 printf ("Error in mpfr_sub_d ("); 98 mpfr_out_str (stdout, 10, 7, y, MPFR_RNDN); 99 printf (" + %.20g)\nexpected ", d); 100 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN); 101 printf ("\ngot "); 102 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); 103 printf ("\n"); 104 exit (1); 105 } 106 mpfr_clears (x, y, z, (mpfr_ptr) 0); 107 108 check_nans (); 109 110 test_generic (MPFR_PREC_MIN, 1000, 100); 111 112 tests_end_mpfr (); 113 return 0; 114} 115