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b58ddff026
* merged mpfr 3.0.0 and gmp 5.0.1 in buildtools trunk git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@37378 a95241bf-73f2-0310-859d-f6bbb57e9c96
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/* Test file for mpfr_pow.
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Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include <stdio.h>
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#include <limits.h>
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#include <stdlib.h>
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#include "mpfr-test.h"
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int
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main (int argc, char *argv[])
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{
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mpfr_t x, y, z;
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mpfr_prec_t prec, yprec;
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mpfr_t t, s;
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mpfr_rnd_t rnd;
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int inexact, compare, compare2;
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unsigned int n, err;
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mpfr_prec_t p0=2, p1=100;
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unsigned int N=25;
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tests_start_mpfr ();
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mpfr_init (x);
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mpfr_init2 (y,sizeof(unsigned long int)*CHAR_BIT);
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mpfr_init (z);
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mpfr_init (s);
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mpfr_init (t);
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/* generic test */
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for (prec = p0; prec <= p1; prec++)
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{
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mpfr_set_prec (x, prec);
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mpfr_set_prec (s, sizeof(unsigned long int)*CHAR_BIT);
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mpfr_set_prec (z, prec);
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mpfr_set_prec (t, prec);
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yprec = prec + 10;
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for (n=0; n<N; n++)
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{
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mpfr_urandomb (x, RANDS);
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mpfr_urandomb (s, RANDS);
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if (randlimb () % 2)
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mpfr_neg (s, s, MPFR_RNDN);
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rnd = RND_RAND ();
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mpfr_set_prec (y, yprec);
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compare = mpfr_pow (y, x, s, rnd);
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err = (rnd == MPFR_RNDN) ? yprec + 1 : yprec;
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if (mpfr_can_round (y, err, rnd, rnd, prec))
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{
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mpfr_set (t, y, rnd);
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inexact = mpfr_pow (z, x, s, rnd);
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if (mpfr_cmp (t, z))
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{
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printf ("results differ for x^y with x=");
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mpfr_out_str (stdout, 2, prec, x, MPFR_RNDN);
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printf (" y=");
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mpfr_out_str (stdout, 2, 0, s, MPFR_RNDN);
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printf (" prec=%u rnd_mode=%s\n", (unsigned int) prec,
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mpfr_print_rnd_mode (rnd));
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printf ("got ");
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mpfr_out_str (stdout, 2, prec, z, MPFR_RNDN);
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puts ("");
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printf ("expected ");
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mpfr_out_str (stdout, 2, prec, t, MPFR_RNDN);
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puts ("");
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printf ("approx ");
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mpfr_print_binary (y);
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puts ("");
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exit (1);
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}
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compare2 = mpfr_cmp (t, y);
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/* if rounding to nearest, cannot know the sign of t - f(x)
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because of composed rounding: y = o(f(x)) and t = o(y) */
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if ((rnd != MPFR_RNDN) && (compare * compare2 >= 0))
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compare = compare + compare2;
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else
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compare = inexact; /* cannot determine sign(t-f(x)) */
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if (((inexact == 0) && (compare != 0)) ||
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((inexact > 0) && (compare <= 0)) ||
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((inexact < 0) && (compare >= 0)))
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{
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printf ("Wrong inexact flag for rnd=%s: expected %d, got %d"
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"\n", mpfr_print_rnd_mode (rnd), compare, inexact);
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printf ("x="); mpfr_print_binary (x); puts ("");
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printf ("y="); mpfr_print_binary (y); puts ("");
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printf ("t="); mpfr_print_binary (t); puts ("");
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exit (1);
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}
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}
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}
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}
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mpfr_clear (s);
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mpfr_clear (t);
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mpfr_clear (x);
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mpfr_clear (y);
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mpfr_clear (z);
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tests_end_mpfr ();
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return 0;
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}
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