1 /* Test file for mpfr_d_div 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_div (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 == +0 */ 49 mpfr_set_inf (x, 1); 50 mpfr_clear_flags (); 51 inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); 52 MPFR_ASSERTN (inexact == 0); 53 MPFR_ASSERTN (__gmpfr_flags == 0); 54 MPFR_ASSERTN (mpfr_zero_p (y)); 55 MPFR_ASSERTN (MPFR_IS_POS (y)); 56 57 /* 1.0 / -inf == -0 */ 58 mpfr_set_inf (x, -1); 59 mpfr_clear_flags (); 60 inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); 61 MPFR_ASSERTN (inexact == 0); 62 MPFR_ASSERTN (__gmpfr_flags == 0); 63 MPFR_ASSERTN (mpfr_zero_p (y)); 64 MPFR_ASSERTN (MPFR_IS_NEG (y)); 65 66 /* 1.0 / 0 == +inf */ 67 mpfr_set_d (x, 0.0, MPFR_RNDN); 68 mpfr_clear_flags (); 69 inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); 70 MPFR_ASSERTN (inexact == 0); 71 MPFR_ASSERTN (__gmpfr_flags == 0); 72 MPFR_ASSERTN (mpfr_inf_p (y)); 73 MPFR_ASSERTN (MPFR_IS_POS (y)); 74 75 mpfr_clear (x); 76 mpfr_clear (y); 77 } 78 79 #define TEST_FUNCTION mpfr_d_sub 80 #define DOUBLE_ARG1 81 #define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS) 82 #include "tgeneric.c" 83 84 int 85 main (void) 86 { 87 mpfr_t x, y, z; 88 double d; 89 int inexact; 90 91 tests_start_mpfr (); 92 93 /* check with enough precision */ 94 mpfr_init2 (x, IEEE_DBL_MANT_DIG); 95 mpfr_init2 (y, IEEE_DBL_MANT_DIG); 96 mpfr_init2 (z, IEEE_DBL_MANT_DIG); 97 98 mpfr_set_str (y, "4096", 10, MPFR_RNDN); 99 d = 0.125; 100 mpfr_clear_flags (); 101 inexact = mpfr_d_div (x, d, y, MPFR_RNDN); 102 if (inexact != 0) 103 { 104 printf ("Inexact flag error in mpfr_d_div\n"); 105 exit (1); 106 } 107 mpfr_set_str (z, " 0.000030517578125", 10, MPFR_RNDN); 108 if (mpfr_cmp (z, x)) 109 { 110 printf ("Error in mpfr_d_div ("); 111 mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN); 112 printf (" + %.20g)\nexpected ", d); 113 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN); 114 printf ("\ngot "); 115 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); 116 printf ("\n"); 117 exit (1); 118 } 119 mpfr_clears (x, y, z, (mpfr_ptr) 0); 120 121 check_nans (); 122 123 test_generic (2, 1000, 100); 124 125 tests_end_mpfr (); 126 return 0; 127 } 128 129 #else 130 131 int 132 main (void) 133 { 134 printf ("Warning! Test disabled for this MPFR version.\n"); 135 return 0; 136 } 137 138 #endif 139