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/* Test file for mpfr_exp10.
Copyright 2007-2020 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU 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 3 of the License, or (at your
option) any later version.
The GNU 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 GNU MPFR Library; see the file COPYING.LESSER. If not, see
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-test.h"
#define TEST_FUNCTION mpfr_exp10
#define TEST_RANDOM_EMIN -36
#define TEST_RANDOM_EMAX 36
#include "tgeneric.c"
static void
special_overflow (void)
{
mpfr_t x, y;
int inex;
mpfr_exp_t emin, emax;
emin = mpfr_get_emin ();
emax = mpfr_get_emax ();
set_emin (-125);
set_emax (128);
mpfr_init2 (x, 24);
mpfr_init2 (y, 24);
mpfr_set_str_binary (x, "0.101100100000000000110100E15");
inex = mpfr_exp10 (y, x, MPFR_RNDN);
if (!mpfr_inf_p (y) || inex <= 0)
{
printf ("Overflow error.\n");
mpfr_dump (y);
printf ("inex = %d\n", inex);
exit (1);
}
mpfr_clear (y);
mpfr_clear (x);
set_emin (emin);
set_emax (emax);
}
static void
emax_m_eps (void)
{
if (mpfr_get_emax () <= LONG_MAX)
{
mpfr_t x, y;
int inex, ov;
mpfr_init2 (x, sizeof(mpfr_exp_t) * CHAR_BIT * 4);
mpfr_init2 (y, 8);
mpfr_set_si (x, mpfr_get_emax (), MPFR_RNDN);
mpfr_clear_flags ();
inex = mpfr_exp10 (y, x, MPFR_RNDN);
ov = mpfr_overflow_p ();
if (!ov || !mpfr_inf_p (y) || inex <= 0)
{
printf ("Overflow error for x = emax, MPFR_RNDN.\n");
mpfr_dump (y);
printf ("inex = %d, %soverflow\n", inex, ov ? "" : "no ");
exit (1);
}
mpfr_clear (x);
mpfr_clear (y);
}
}
static void
exp_range (void)
{
mpfr_t x;
mpfr_exp_t emin;
emin = mpfr_get_emin ();
set_emin (3);
mpfr_init2 (x, 16);
mpfr_set_ui (x, 4, MPFR_RNDN);
mpfr_exp10 (x, x, MPFR_RNDN);
set_emin (emin);
if (mpfr_nan_p (x) || mpfr_cmp_ui (x, 10000) != 0)
{
printf ("Error in mpfr_exp10 for x = 4, with emin = 3\n");
printf ("Expected 10000, got ");
mpfr_out_str (stdout, 2, 0, x, MPFR_RNDN);
printf ("\n");
exit (1);
}
mpfr_clear (x);
}
static void
overfl_exp10_0 (void)
{
mpfr_t x, y;
int emax, i, inex, rnd, err = 0;
mpfr_exp_t old_emax;
old_emax = mpfr_get_emax ();
mpfr_init2 (x, 8);
mpfr_init2 (y, 8);
for (emax = -1; emax <= 0; emax++)
{
mpfr_set_ui_2exp (y, 1, emax, MPFR_RNDN);
mpfr_nextbelow (y);
set_emax (emax); /* 1 is not representable. */
/* and if emax < 0, 1 - eps is not representable either. */
for (i = -1; i <= 1; i++)
RND_LOOP (rnd)
{
mpfr_set_si_2exp (x, i, -512 * ABS (i), MPFR_RNDN);
mpfr_clear_flags ();
inex = mpfr_exp10 (x, x, (mpfr_rnd_t) rnd);
if ((i >= 0 || emax < 0 || rnd == MPFR_RNDN || rnd == MPFR_RNDU) &&
! mpfr_overflow_p ())
{
printf ("Error in overfl_exp10_0 (i = %d, rnd = %s):\n"
" The overflow flag is not set.\n",
i, mpfr_print_rnd_mode ((mpfr_rnd_t) rnd));
err = 1;
}
if (rnd == MPFR_RNDZ || rnd == MPFR_RNDD)
{
if (inex >= 0)
{
printf ("Error in overfl_exp10_0 (i = %d, rnd = %s):\n"
" The inexact value must be negative.\n",
i, mpfr_print_rnd_mode ((mpfr_rnd_t) rnd));
err = 1;
}
if (! mpfr_equal_p (x, y))
{
printf ("Error in overfl_exp10_0 (i = %d, rnd = %s):\n"
" Got ", i,
mpfr_print_rnd_mode ((mpfr_rnd_t) rnd));
mpfr_dump (x);
printf (" instead of 0.11111111E%d.\n", emax);
err = 1;
}
}
else if (rnd != MPFR_RNDF)
{
if (inex <= 0)
{
printf ("Error in overfl_exp10_0 (i = %d, rnd = %s):\n"
" The inexact value must be positive.\n",
i, mpfr_print_rnd_mode ((mpfr_rnd_t) rnd));
err = 1;
}
if (! (mpfr_inf_p (x) && MPFR_IS_POS (x)))
{
printf ("Error in overfl_exp10_0 (i = %d, rnd = %s):\n"
" Got ", i,
mpfr_print_rnd_mode ((mpfr_rnd_t) rnd));
mpfr_dump (x);
printf (" instead of +Inf.\n");
err = 1;
}
}
}
set_emax (old_emax);
}
if (err)
exit (1);
mpfr_clear (x);
mpfr_clear (y);
}
int
main (int argc, char *argv[])
{
mpfr_t x, y;
mpfr_exp_t emin, emax;
int inex, ov;
tests_start_mpfr ();
special_overflow ();
emax_m_eps ();
exp_range ();
mpfr_init (x);
mpfr_init (y);
mpfr_set_ui (x, 4, MPFR_RNDN);
mpfr_exp10 (y, x, MPFR_RNDN);
if (mpfr_cmp_ui (y, 10000) != 0)
{
printf ("Error for 10^4, MPFR_RNDN\n");
exit (1);
}
mpfr_exp10 (y, x, MPFR_RNDD);
if (mpfr_cmp_ui (y, 10000) != 0)
{
printf ("Error for 10^4, MPFR_RNDD\n");
exit (1);
}
mpfr_exp10 (y, x, MPFR_RNDU);
if (mpfr_cmp_ui (y, 10000) != 0)
{
printf ("Error for 10^4, MPFR_RNDU\n");
exit (1);
}
mpfr_set_prec (x, 10);
mpfr_set_prec (y, 10);
/* save emin */
emin = mpfr_get_emin ();
set_emin (-11);
mpfr_set_si (x, -4, MPFR_RNDN);
mpfr_exp10 (y, x, MPFR_RNDN);
if (MPFR_NOTZERO (y) || MPFR_IS_NEG (y))
{
printf ("Error for emin = -11, x = -4, RNDN\n");
printf ("Expected +0\n");
printf ("Got "); mpfr_dump (y);
exit (1);
}
/* restore emin */
set_emin (emin);
/* save emax */
emax = mpfr_get_emax ();
set_emax (13);
mpfr_set_ui (x, 4, MPFR_RNDN);
mpfr_exp10 (y, x, MPFR_RNDN);
if (!mpfr_inf_p (y) || mpfr_sgn (y) < 0)
{
printf ("Error for emax = 13, x = 4, RNDN\n");
printf ("Expected +inf\n");
printf ("Got "); mpfr_dump (y);
exit (1);
}
/* restore emax */
set_emax (emax);
MPFR_SET_INF (x);
MPFR_SET_POS (x);
mpfr_exp10 (y, x, MPFR_RNDN);
if (!MPFR_IS_INF (y))
{
printf ("evaluation of function in INF does not return INF\n");
exit (1);
}
MPFR_CHANGE_SIGN (x);
mpfr_exp10 (y, x, MPFR_RNDN);
if (!MPFR_IS_ZERO (y))
{
printf ("evaluation of function in -INF does not return 0\n");
exit (1);
}
MPFR_SET_NAN (x);
mpfr_exp10 (y, x, MPFR_RNDN);
if (!MPFR_IS_NAN (y))
{
printf ("evaluation of function in NaN does not return NaN\n");
exit (1);
}
if ((mpfr_uexp_t) 8 << 31 != 0 ||
mpfr_get_emax () <= (mpfr_uexp_t) 100000 * 100000)
{
/* emax <= 10000000000 */
mpfr_set_prec (x, 40);
mpfr_set_prec (y, 40);
mpfr_set_str (x, "3010299957", 10, MPFR_RNDN);
mpfr_clear_flags ();
inex = mpfr_exp10 (y, x, MPFR_RNDN);
ov = mpfr_overflow_p ();
if (!(MPFR_IS_INF (y) && MPFR_IS_POS (y) && ov))
{
printf ("Overflow error for x = 3010299957, MPFR_RNDN.\n");
mpfr_dump (y);
printf ("inex = %d, %soverflow\n", inex, ov ? "" : "no ");
exit (1);
}
}
test_generic (MPFR_PREC_MIN, 100, 100);
mpfr_clear (x);
mpfr_clear (y);
overfl_exp10_0 ();
data_check ("data/exp10", mpfr_exp10, "mpfr_exp10");
tests_end_mpfr ();
return 0;
}
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