1 /* Test file for mpfr_const_log2. 2 3 Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. 4 Contributed by the AriC and Caramel 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 26 #include "mpfr-test.h" 27 28 /* tlog2 [prec] [rnd] [0 = no print] */ 29 30 static void 31 check (mpfr_prec_t p0, mpfr_prec_t p1) 32 { 33 mpfr_t x, y, z; 34 mpfr_rnd_t rnd; 35 int dif; 36 37 mpfr_init (x); 38 mpfr_init (y); 39 mpfr_init2 (z, p1 + 10); 40 mpfr_const_log2 (z, MPFR_RNDN); 41 mpfr_clear_cache (__gmpfr_cache_const_log2); 42 43 for (; p0<=p1; p0++) 44 { 45 mpfr_set_prec (x, p0); 46 mpfr_set_prec (y, p0); 47 { 48 rnd = RND_RAND (); 49 mpfr_const_log2 (x, rnd); 50 mpfr_set (y, z, rnd); 51 if ((dif = mpfr_cmp (x, y)) 52 && mpfr_can_round (z, mpfr_get_prec(z), MPFR_RNDN, 53 rnd, p0)) 54 { 55 printf ("mpfr_const_log2 fails for prec=%u, rnd=%s Diff=%d\n", 56 (unsigned int) p0, mpfr_print_rnd_mode (rnd), dif); 57 printf ("expected "), mpfr_dump (y); 58 printf ("got "), mpfr_dump (x); 59 exit (1); 60 } 61 } 62 } 63 64 mpfr_clear (x); 65 mpfr_clear (y); 66 mpfr_clear (z); 67 } 68 69 static void 70 check_large (void) 71 { 72 mpfr_t x, y; 73 mpfr_init2 (x, 25000); 74 mpfr_init2 (y, 26000); 75 (mpfr_const_log2) (x, MPFR_RNDN); /* First one ! */ 76 (mpfr_const_log2) (y, MPFR_RNDN); /* Then the other - cache - */ 77 mpfr_prec_round (y, 25000, MPFR_RNDN); 78 if (mpfr_cmp (x, y)) 79 { 80 printf ("const_log2: error for large prec\n"); 81 exit (1); 82 } 83 84 /* worst-case with 15 successive ones after last bit, 85 to exercise can_round loop */ 86 mpfr_set_prec (x, 26249); 87 mpfr_const_log2 (x, MPFR_RNDZ); 88 89 mpfr_clears (x, y, (mpfr_ptr) 0); 90 } 91 92 static void 93 check_cache (void) 94 { 95 mpfr_t x; 96 int i; 97 98 mpfr_init2 (x, 195); 99 mpfr_free_cache (); 100 i = mpfr_const_log2 (x, MPFR_RNDN); 101 if (i == 0) 102 { 103 printf("Error for log2. Invalid ternary value (1).\n"); 104 exit (1); 105 } 106 mpfr_set_prec (x, 194); 107 i = mpfr_const_log2 (x, MPFR_RNDN); 108 if (i == 0) 109 { 110 printf("Error for log2. Invalid ternary value (2).\n"); 111 exit (1); 112 } 113 114 mpfr_free_cache (); 115 mpfr_set_prec (x, 9); 116 mpfr_const_log2 (x, MPFR_RNDN); 117 mpfr_set_prec (x, 8); 118 mpfr_const_log2 (x, MPFR_RNDN); 119 if (mpfr_cmp_str (x, "0.10110001E0", 2, MPFR_RNDN)) 120 { 121 printf("Error for log2. Wrong rounding.\n"); 122 exit (1); 123 } 124 125 mpfr_clear (x); 126 } 127 128 /* Wrapper for tgeneric */ 129 static int 130 my_const_log2 (mpfr_ptr x, mpfr_srcptr y, mpfr_rnd_t r) 131 { 132 return mpfr_const_log2 (x, r); 133 } 134 135 #define RAND_FUNCTION(x) mpfr_set_ui ((x), 0, MPFR_RNDN) 136 #define TEST_FUNCTION my_const_log2 137 #include "tgeneric.c" 138 139 int 140 main (int argc, char *argv[]) 141 { 142 mpfr_t x; 143 int p; 144 mpfr_rnd_t rnd; 145 146 tests_start_mpfr (); 147 148 p = (argc>1) ? atoi(argv[1]) : 53; 149 rnd = (argc>2) ? (mpfr_rnd_t) atoi(argv[2]) : MPFR_RNDZ; 150 151 mpfr_init (x); 152 153 check (2, 1000); 154 155 /* check precision of 2 bits */ 156 mpfr_set_prec (x, 2); 157 mpfr_const_log2 (x, MPFR_RNDN); 158 if (mpfr_cmp_ui_2exp(x, 3, -2)) /* 3*2^-2 */ 159 { 160 printf ("mpfr_const_log2 failed for prec=2, rnd=MPFR_RNDN\n" 161 "expected 0.75, got "); 162 mpfr_out_str(stdout, 10, 0, x, MPFR_RNDN); 163 putchar('\n'); 164 exit (1); 165 } 166 167 if (argc>=2) 168 { 169 mpfr_set_prec (x, p); 170 mpfr_const_log2 (x, rnd); 171 printf ("log(2)="); 172 mpfr_out_str (stdout, 10, 0, x, rnd); 173 puts (""); 174 } 175 176 mpfr_set_prec (x, 53); 177 mpfr_const_log2 (x, MPFR_RNDZ); 178 if (mpfr_cmp_str1 (x, "6.9314718055994530941e-1") ) 179 { 180 printf ("mpfr_const_log2 failed for prec=53\n"); 181 exit (1); 182 } 183 184 mpfr_set_prec (x, 32); 185 mpfr_const_log2 (x, MPFR_RNDN); 186 if (mpfr_cmp_str1 (x, "0.69314718060195446")) 187 { 188 printf ("mpfr_const_log2 failed for prec=32\n"); 189 exit (1); 190 } 191 192 mpfr_clear(x); 193 194 check_large(); 195 check_cache (); 196 197 test_generic (2, 200, 1); 198 199 tests_end_mpfr (); 200 return 0; 201 } 202