1 /* Test file for mpfr_div_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_div_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_div_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_div_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 /* 0.0 / 0.0 is nan */ 67 mpfr_set_d (x, 0.0, MPFR_RNDN); 68 mpfr_clear_flags (); 69 inexact = mpfr_div_d (y, x, 0.0, MPFR_RNDN); 70 MPFR_ASSERTN (inexact == 0); 71 MPFR_ASSERTN ((__gmpfr_flags ^ MPFR_FLAGS_NAN) == 0); 72 MPFR_ASSERTN (mpfr_nan_p (y)); 73 74 mpfr_clear (x); 75 mpfr_clear (y); 76 } 77 78 #define TEST_FUNCTION mpfr_sub_d 79 #define DOUBLE_ARG2 80 #define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS) 81 #include "tgeneric.c" 82 83 int 84 main (void) 85 { 86 mpfr_t x, y, z; 87 double d; 88 int inexact; 89 90 tests_start_mpfr (); 91 92 /* check with enough precision */ 93 mpfr_init2 (x, IEEE_DBL_MANT_DIG); 94 mpfr_init2 (y, IEEE_DBL_MANT_DIG); 95 mpfr_init2 (z, IEEE_DBL_MANT_DIG); 96 97 mpfr_set_str (y, "4096", 10, MPFR_RNDN); 98 d = 0.125; 99 mpfr_clear_flags (); 100 inexact = mpfr_div_d (x, y, d, MPFR_RNDN); 101 if (inexact != 0) 102 { 103 printf ("Inexact flag error in mpfr_div_d\n"); 104 exit (1); 105 } 106 mpfr_set_str (z, "32768", 10, MPFR_RNDN); 107 if (mpfr_cmp (z, x)) 108 { 109 printf ("Error in mpfr_div_d ("); 110 mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN); 111 printf (" + %.20g)\nexpected ", d); 112 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN); 113 printf ("\ngot "); 114 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); 115 printf ("\n"); 116 exit (1); 117 } 118 mpfr_clears (x, y, z, (mpfr_ptr) 0); 119 120 check_nans (); 121 122 test_generic (2, 1000, 100); 123 124 tests_end_mpfr (); 125 return 0; 126 } 127 128 #else 129 130 int 131 main (void) 132 { 133 printf ("Warning! Test disabled for this MPFR version.\n"); 134 return 0; 135 } 136 137 #endif 138