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/* Test file for mpfr_const_log2.
Copyright 1999, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Place, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "mpfr-test.h"
/* tlog2 [prec] [rnd] [0 = no print] */
static void
check (mp_prec_t p0, mp_prec_t p1)
{
mpfr_t x, y, z;
mp_rnd_t rnd;
int dif;
mpfr_init (x);
mpfr_init (y);
mpfr_init2 (z, p1 + 10);
mpfr_const_log2 (z, GMP_RNDN);
mpfr_clear_cache (__gmpfr_cache_const_log2);
for (; p0<=p1; p0++)
{
mpfr_set_prec (x, p0);
mpfr_set_prec (y, p0);
{
rnd = (mp_rnd_t) RND_RAND ();
mpfr_const_log2 (x, rnd);
mpfr_set (y, z, rnd);
if ((dif = mpfr_cmp (x, y))
&& mpfr_can_round (z, mpfr_get_prec(z), GMP_RNDN,
rnd, p0))
{
printf ("mpfr_const_log2 fails for prec=%u, rnd=%s Diff=%d\n",
(unsigned int) p0, mpfr_print_rnd_mode (rnd), dif);
printf ("expected "), mpfr_dump (y);
printf ("got "), mpfr_dump (x);
exit (1);
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
}
static void
check_large (void)
{
mpfr_t x, y;
mpfr_init2 (x, 25000);
mpfr_init2 (y, 26000);
(mpfr_const_log2) (x, GMP_RNDN); /* First one ! */
(mpfr_const_log2) (y, GMP_RNDN); /* Then the other - cache - */
mpfr_prec_round (y, 25000, GMP_RNDN);
if (mpfr_cmp (x, y))
{
printf ("const_log2: error for large prec\n");
exit (1);
}
/* worst-case with 15 successive ones after last bit,
to exercise can_round loop */
mpfr_set_prec (x, 26249);
mpfr_const_log2 (x, GMP_RNDZ);
mpfr_clears (x, y, NULL);
}
static void
check_cache ()
{
mpfr_t x;
int i;
mpfr_init2 (x, 195);
mpfr_free_cache ();
i = mpfr_const_log2 (x, GMP_RNDN);
if (i == 0)
{
printf("Error for log2. Invalid ternary value (1).\n");
exit (1);
}
mpfr_set_prec (x, 194);
i = mpfr_const_log2 (x, GMP_RNDN);
if (i == 0)
{
printf("Error for log2. Invalid ternary value (2).\n");
exit (1);
}
mpfr_free_cache ();
mpfr_set_prec (x, 9);
mpfr_const_log2 (x, GMP_RNDN);
mpfr_set_prec (x, 8);
mpfr_const_log2 (x, GMP_RNDN);
if (mpfr_cmp_str (x, "0.10110001E0", 2, GMP_RNDN))
{
printf("Error for log2. Wrong rounding.\n");
exit (1);
}
mpfr_clear (x);
}
int
main (int argc, char *argv[])
{
mpfr_t x;
int p;
mp_rnd_t rnd;
tests_start_mpfr ();
p = (argc>1) ? atoi(argv[1]) : 53;
rnd = (argc>2) ? (mp_rnd_t) atoi(argv[2]) : GMP_RNDZ;
mpfr_init (x);
check (2, 1000);
/* check precision of 2 bits */
mpfr_set_prec (x, 2);
mpfr_const_log2 (x, GMP_RNDN);
if (mpfr_cmp_ui_2exp(x, 3, -2)) /* 3*2^-2 */
{
printf ("mpfr_const_log2 failed for prec=2, rnd=GMP_RNDN\n"
"expected 0.75, got ");
mpfr_out_str(stdout, 10, 0, x, GMP_RNDN);
putchar('\n');
exit (1);
}
if (argc>=2)
{
mpfr_set_prec (x, p);
mpfr_const_log2 (x, rnd);
printf ("log(2)=");
mpfr_out_str (stdout, 10, 0, x, rnd);
puts ("");
}
mpfr_set_prec (x, 53);
mpfr_const_log2 (x, GMP_RNDZ);
if (mpfr_cmp_str1 (x, "6.9314718055994530941e-1") )
{
printf ("mpfr_const_log2 failed for prec=53\n");
exit (1);
}
mpfr_set_prec (x, 32);
mpfr_const_log2 (x, GMP_RNDN);
if (mpfr_cmp_str1 (x, "0.69314718060195446"))
{
printf ("mpfr_const_log2 failed for prec=32\n");
exit (1);
}
mpfr_clear(x);
check_large();
check_cache ();
tests_end_mpfr ();
return 0;
}
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