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/* Test file for mpfr_set_z_2exp.
Copyright 1999, 2001-2020 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"
static mpfr_exp_t
randexp (void)
{
return (mpfr_exp_t) (randlimb () % (__gmpfr_emax - __gmpfr_emin))
+ __gmpfr_emin;
}
static void
check0 (void)
{
mpz_t y;
mpfr_t x;
int inexact, r;
mpfr_exp_t e;
/* Check for +0 */
mpfr_init (x);
mpz_init (y);
mpz_set_si (y, 0);
for (r = 0; r < MPFR_RND_MAX; r++)
{
e = randexp ();
inexact = mpfr_set_z_2exp (x, y, e, (mpfr_rnd_t) r);
if (!MPFR_IS_ZERO(x) || !MPFR_IS_POS(x) || inexact)
{
printf ("mpfr_set_z_2exp(x,0,e) failed for e=");
if (e < LONG_MIN)
printf ("(<LONG_MIN)");
else if (e > LONG_MAX)
printf ("(>LONG_MAX)");
else
printf ("%ld", (long) e);
printf (", rnd=%s\n", mpfr_print_rnd_mode ((mpfr_rnd_t) r));
exit (1);
}
}
/* coverage test for huge exponent */
mpz_setbit (y, GMP_NUMB_BITS);
mpfr_clear_flags ();
inexact = mpfr_set_z_2exp (x, y, mpfr_get_emax_max(), MPFR_RNDN);
MPFR_ASSERTN(inexact > 0);
MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
MPFR_ASSERTN(mpfr_overflow_p ());
mpfr_clear(x);
mpz_clear(y);
}
/* FIXME: It'd be better to examine the actual data in an mpfr_t to see that
it's as expected. Comparing mpfr_set_z with mpfr_cmp or against
mpfr_get_si is a rather indirect test of a low level routine. */
static void
check (long i, mpfr_rnd_t rnd)
{
mpfr_t f;
mpz_t z;
mpfr_exp_t e;
int inex;
/* using CHAR_BIT * sizeof(long) bits of precision ensures that
mpfr_set_z_2exp is exact below */
mpfr_init2 (f, CHAR_BIT * sizeof(long));
mpz_init (z);
mpz_set_ui (z, i);
/* the following loop ensures that no overflow occurs */
do
e = randexp ();
while (e > mpfr_get_emax () - CHAR_BIT * sizeof(long));
inex = mpfr_set_z_2exp (f, z, e, rnd);
if (inex != 0)
{
printf ("Error in mpfr_set_z_2exp for i=%ld, e=%ld,"
" wrong ternary value\n", i, (long) e);
printf ("expected 0, got %d\n", inex);
exit (1);
}
mpfr_div_2si (f, f, e, rnd);
if (mpfr_get_si (f, MPFR_RNDZ) != i)
{
printf ("Error in mpfr_set_z_2exp for i=%ld e=", i);
if (e < LONG_MIN)
printf ("(<LONG_MIN)");
else if (e > LONG_MAX)
printf ("(>LONG_MAX)");
else
printf ("%ld", (long) e);
printf (" rnd_mode=%d\n", rnd);
printf ("expected %ld\n", i);
printf ("got "); mpfr_dump (f);
exit (1);
}
mpfr_clear (f);
mpz_clear (z);
}
int
main (int argc, char *argv[])
{
long j;
tests_start_mpfr ();
check (0, MPFR_RNDN);
for (j = 0; j < 200000; j++)
check (randlimb () & LONG_MAX, RND_RAND ());
check0 ();
tests_end_mpfr ();
return 0;
}
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