1 /* Test file for mpfr_pow. 2 3 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 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 <limits.h> 25 #include <stdlib.h> 26 27 #include "mpfr-test.h" 28 29 30 int 31 main (int argc, char *argv[]) 32 { 33 mpfr_t x, y, z; 34 35 mpfr_prec_t prec, yprec; 36 mpfr_t t, s; 37 mpfr_rnd_t rnd; 38 int inexact, compare, compare2; 39 unsigned int n, err; 40 41 mpfr_prec_t p0=2, p1=100; 42 unsigned int N=25; 43 44 tests_start_mpfr (); 45 46 mpfr_init (x); 47 mpfr_init2 (y,sizeof(unsigned long int)*CHAR_BIT); 48 mpfr_init (z); 49 50 mpfr_init (s); 51 mpfr_init (t); 52 53 /* generic test */ 54 for (prec = p0; prec <= p1; prec++) 55 { 56 mpfr_set_prec (x, prec); 57 mpfr_set_prec (s, sizeof(unsigned long int)*CHAR_BIT); 58 mpfr_set_prec (z, prec); 59 mpfr_set_prec (t, prec); 60 yprec = prec + 10; 61 62 for (n=0; n<N; n++) 63 { 64 mpfr_urandomb (x, RANDS); 65 mpfr_urandomb (s, RANDS); 66 if (randlimb () % 2) 67 mpfr_neg (s, s, MPFR_RNDN); 68 rnd = RND_RAND (); 69 mpfr_set_prec (y, yprec); 70 compare = mpfr_pow (y, x, s, rnd); 71 err = (rnd == MPFR_RNDN) ? yprec + 1 : yprec; 72 if (mpfr_can_round (y, err, rnd, rnd, prec)) 73 { 74 mpfr_set (t, y, rnd); 75 inexact = mpfr_pow (z, x, s, rnd); 76 if (mpfr_cmp (t, z)) 77 { 78 printf ("results differ for x^y with x="); 79 mpfr_out_str (stdout, 2, prec, x, MPFR_RNDN); 80 printf (" y="); 81 mpfr_out_str (stdout, 2, 0, s, MPFR_RNDN); 82 printf (" prec=%u rnd_mode=%s\n", (unsigned int) prec, 83 mpfr_print_rnd_mode (rnd)); 84 printf ("got "); 85 mpfr_out_str (stdout, 2, prec, z, MPFR_RNDN); 86 puts (""); 87 printf ("expected "); 88 mpfr_out_str (stdout, 2, prec, t, MPFR_RNDN); 89 puts (""); 90 printf ("approx "); 91 mpfr_print_binary (y); 92 puts (""); 93 exit (1); 94 } 95 compare2 = mpfr_cmp (t, y); 96 /* if rounding to nearest, cannot know the sign of t - f(x) 97 because of composed rounding: y = o(f(x)) and t = o(y) */ 98 if ((rnd != MPFR_RNDN) && (compare * compare2 >= 0)) 99 compare = compare + compare2; 100 else 101 compare = inexact; /* cannot determine sign(t-f(x)) */ 102 if (((inexact == 0) && (compare != 0)) || 103 ((inexact > 0) && (compare <= 0)) || 104 ((inexact < 0) && (compare >= 0))) 105 { 106 printf ("Wrong inexact flag for rnd=%s: expected %d, got %d" 107 "\n", mpfr_print_rnd_mode (rnd), compare, inexact); 108 printf ("x="); mpfr_print_binary (x); puts (""); 109 printf ("y="); mpfr_print_binary (y); puts (""); 110 printf ("t="); mpfr_print_binary (t); puts (""); 111 exit (1); 112 } 113 } 114 } 115 } 116 117 mpfr_clear (s); 118 mpfr_clear (t); 119 120 mpfr_clear (x); 121 mpfr_clear (y); 122 mpfr_clear (z); 123 124 tests_end_mpfr (); 125 return 0; 126 } 127