1 /* Test file for mpfr_d_sub 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 /* 1.0 - nan is nan */ 41 mpfr_set_nan (x); 42 mpfr_clear_flags (); 43 inexact = mpfr_d_sub (y, 1.0, x, 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 /* 1.0 - +inf == -inf */ 49 mpfr_set_inf (x, 1); 50 mpfr_clear_flags (); 51 inexact = mpfr_d_sub (y, 1.0, x, 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_NEG (y)); 56 57 /* 1.0 - -inf == +inf */ 58 mpfr_set_inf (x, -1); 59 mpfr_clear_flags (); 60 inexact = mpfr_d_sub (y, 1.0, x, 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_POS (y)); 65 66 mpfr_clear (x); 67 mpfr_clear (y); 68 } 69 70 #define TEST_FUNCTION mpfr_d_sub 71 #define DOUBLE_ARG1 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 82 tests_start_mpfr (); 83 84 /* check with enough precision */ 85 mpfr_init2 (x, IEEE_DBL_MANT_DIG); 86 mpfr_init2 (y, IEEE_DBL_MANT_DIG); 87 mpfr_init2 (z, IEEE_DBL_MANT_DIG); 88 89 mpfr_set_str (y, "4096", 10, MPFR_RNDN); 90 d = 0.125; 91 mpfr_clear_flags (); 92 inexact = mpfr_d_sub (x, d, y, MPFR_RNDN); 93 if (inexact != 0) 94 { 95 printf ("Inexact flag error in mpfr_d_sub\n"); 96 exit (1); 97 } 98 mpfr_set_str (z, "-4095.875", 10, MPFR_RNDN); 99 if (mpfr_cmp (z, x)) 100 { 101 printf ("Error in mpfr_d_sub ("); 102 mpfr_out_str (stdout, 10, 7, y, MPFR_RNDN); 103 printf (" + %.20g)\nexpected ", d); 104 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN); 105 printf ("\ngot "); 106 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); 107 printf ("\n"); 108 exit (1); 109 } 110 mpfr_clears (x, y, z, (mpfr_ptr) 0); 111 112 check_nans (); 113 114 test_generic (2, 1000, 100); 115 116 tests_end_mpfr (); 117 return 0; 118 } 119 120 #else 121 122 int 123 main (void) 124 { 125 printf ("Warning! Test disabled for this MPFR version.\n"); 126 return 0; 127 } 128 129 #endif 130