1 /* Test file for mpfr_sub_d 2 3 Copyright 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 4 Contributed by the Arenaire and Cacao projects, INRIA. 5 6 This file is part of the GNU MPFR Library. 7 8 The GNU MPFR Library is free software; you can redistribute it and/or modify 9 it under the terms of the GNU Lesser General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or (at your 11 option) any later version. 12 13 The GNU MPFR Library is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 License for more details. 17 18 You should have received a copy of the GNU Lesser General Public License 19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 21 51 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 31 static void 32 check_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 75 int 76 main (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 120 121 int 122 main (void) 123 { 124 printf ("Warning! Test disabled for this MPFR version.\n"); 125 return 0; 126 } 127 128 #endif 129