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/* Test mpq_set_d.
Copyright 2001-2003, 2005, 2013, 2018 Free Software Foundation, Inc.
This file is part of the GNU MP Library test suite.
The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU 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 MP Library test suite 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 General
Public License for more details.
You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
#include <math.h>
#include <float.h>
#include <limits.h>
#include "testutils.h"
#include "../mini-mpq.h"
#define COUNT 2000
mp_bitcnt_t
mpz_mantissasizeinbits (const mpz_t z)
{
return ! mpz_cmp_ui (z, 0) ? 0 :
mpz_sizeinbase (z, 2) - mpz_scan1 (z, 0);
}
int
mpz_abspow2_p (const mpz_t z)
{
return mpz_mantissasizeinbits (z) == 1;
}
mp_bitcnt_t
mpq_mantissasizeinbits (const mpq_t q)
{
if (! mpz_abspow2_p (mpq_denref (q)))
return ~ (mp_bitcnt_t) 0;
return mpz_mantissasizeinbits (mpq_numref (q));
}
#if defined(DBL_MANT_DIG) && FLT_RADIX == 2
int
mpz_get_d_exact_p (const mpz_t z)
{
return mpz_mantissasizeinbits (z) <= DBL_MANT_DIG;
}
int
mpq_get_d_exact_p (const mpq_t q)
{
return mpq_mantissasizeinbits (q) <= DBL_MANT_DIG;
}
#define HAVE_EXACT_P 1
#endif
void
check_random (void)
{
unsigned i;
mpz_t x;
mpq_t y, z;
mpz_init (x);
mpq_init (y);
mpq_init (z);
for (i = 0; i < COUNT; i++)
{
/* Use volatile, to avoid extended precision in floating point
registers, e.g., on m68k and 80387. */
volatile double d, f;
unsigned long m;
int e, c;
mini_rrandomb (x, CHAR_BIT * sizeof (unsigned long));
m = mpz_get_ui (x);
mini_urandomb (x, 8);
e = mpz_get_ui (x) - 128;
d = ldexp ((double) m, e);
mpq_set_d (y, d);
f = mpq_get_d (y);
if (f != d)
{
fprintf (stderr, "mpq_set_d/mpq_get_d failed:\n");
goto dumperror;
}
d = - d;
mpq_neg (y, y);
mpq_set_d (z, d);
f = mpq_get_d (z);
if (f != d || !mpq_equal (y, z))
{
fprintf (stderr, "mpq_set_d/mpq_get_d failed:\n");
dumperror:
dump ("ny", mpq_numref (y));
dump ("dy", mpq_denref (y));
fprintf (stderr, "m = %lx, e = %i\n", m, e);
fprintf (stderr, "d = %.35g\n", d);
fprintf (stderr, "f = %.35g\n", f);
fprintf (stderr, "f - d = %.35g\n", f - d);
abort ();
}
mini_rrandomb (x, CHAR_BIT * sizeof (unsigned long));
m = mpz_get_ui (x);
mini_urandomb (x, 8);
e = mpz_get_ui (x) - 128;
d = ldexp ((double) m, e);
mpq_set_d (y, d);
if (i == 0)
mpq_neg (z, y);
mpq_add (y, y, z);
mpq_set_d (z, mpq_get_d (y));
f = mpq_get_d (z);
c = mpq_cmp (y, z);
#if defined(HAVE_EXACT_P)
if (mpq_get_d_exact_p (y) ? c != 0 : (f > 0 ? c <= 0 : c >= 0))
#else
if (f > 0 ? c < 0 : c > 0)
#endif
{
fprintf (stderr, "mpq_get_d/mpq_set_d failed: %i %i\n", i, c);
goto dumperror;
}
}
mpz_clear (x);
mpq_clear (y);
mpq_clear (z);
}
void
check_data (void)
{
static const struct {
double y;
long int n;
unsigned long d;
} data[] = {
{ 0.0, 0, 1 },
{ 1.0, 1, 1 },
{ -1.0, -1, 1 },
{ -1.5, -3, 2 },
{-1.25, -5, 4 },
{0.125, 1, 8 },
{24685,24685,1},
{-9876,-9876,1},
{463.5, 927,2},
{1234.5/8192, 2469, 16384 },
{-543.0/1024, -543, 1024 },
{9876.5/ 512, 19753, 1024 },
{9753.0/ 128, 9753, 128 },
{-789.0/ 32, -789, 32 },
{4.580078125, 2345, 512 },
};
mpq_t x, r;
unsigned i;
double d;
mpq_init (x);
mpq_init (r);
for (i = 0; i < numberof (data); i++)
{
mpq_set_d (x, data[i].y);
mpq_set_si (r, data[i].n, data[i].d);
mpq_canonicalize (r);
if (!mpq_equal (x, r))
{
fprintf (stderr, "mpq_set_d failed: %li / %lu != %g\n", data[i].n, data[i].d, data[i].y);
abort ();
}
d = mpq_get_d (r);
if (d != data[i].y)
{
fprintf (stderr, "mpq_get_d failed: %li / %lu != %g\n", data[i].n, data[i].d, data[i].y);
abort ();
}
}
mpq_clear (x);
mpq_clear (r);
}
void
testmain (int argc, char *argv[])
{
check_data ();
check_random ();
}
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