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/* Test file for mpfr_can_round.
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"
#define MAX_LIMB_SIZE 100
static void
check_round_p (void)
{
mp_limb_t buf[MAX_LIMB_SIZE];
mp_size_t n;
mp_prec_t p;
mp_exp_t err;
int r1, r2;
for (n = 2 ; n <= MAX_LIMB_SIZE ; n++)
{
mpn_random (buf, n);
p = (mp_prec_t) randlimb() % ((n-1) * BITS_PER_MP_LIMB) + MPFR_PREC_MIN;
err = p + randlimb () % BITS_PER_MP_LIMB;
r1 = mpfr_round_p (buf, n, err, p);
r2 = mpfr_can_round_raw (buf, n, MPFR_SIGN_POS, err,
GMP_RNDN, GMP_RNDZ, p);
if (r1 != r2)
{
printf ("mpfr_round_p(%d) != mpfr_can_round(%d)!\n"
"bn=%ld err0=%ld prec=%ld\nbp=",
r1, r2, n, err, p);
while (n--)
printf ("%08lX ", buf[n]);
putchar ('\n');
exit (1);
}
}
}
int
main (void)
{
mpfr_t x;
mp_prec_t i, j;
MPFR_TEST_USE_RANDS ();
tests_start_mpfr ();
/* checks that rounds to nearest sets the last
bit to zero in case of equal distance */
mpfr_init2 (x, 59);
mpfr_set_str_binary (x, "-0.10010001010111000011110010111010111110000000111101100111111E663");
if (mpfr_can_round (x, 54, GMP_RNDZ, GMP_RNDZ, 53) != 0)
{
printf ("Error (1) in mpfr_can_round\n");
exit (1);
}
mpfr_set_str_binary (x, "-Inf");
if (mpfr_can_round (x, 2000, GMP_RNDZ, GMP_RNDZ, 2000) != 0)
{
printf ("Error (2) in mpfr_can_round\n");
exit (1);
}
mpfr_set_prec (x, 64);
mpfr_set_str_binary (x, "0.1011001000011110000110000110001111101011000010001110011000000000");
if (mpfr_can_round (x, 65, GMP_RNDN, GMP_RNDN, 54))
{
printf ("Error (3) in mpfr_can_round\n");
exit (1);
}
mpfr_set_prec (x, 62);
mpfr_set_str (x, "0.ff4ca619c76ba69", 16, GMP_RNDZ);
for (i = 30; i < 99; i++)
for (j = 30; j < 99; j++)
{
int r1, r2;
for (r1 = 0; r1 < GMP_RND_MAX ; r1++)
for (r2 = 0; r2 < GMP_RND_MAX ; r2++)
mpfr_can_round (x, i, (mp_rnd_t) r1, (mp_rnd_t) r2, j); /* test for assertions */
}
mpfr_clear (x);
check_round_p ();
tests_end_mpfr ();
return 0;
}
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