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/* Miscellaneous support for test programs.
Copyright 2001, 2002 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., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
void
tests_start_mpfr (void)
{
tests_memory_start ();
}
void
tests_end_mpfr (void)
{
if (__mpfr_const_pi_prec != 0)
{
mpfr_clear (__mpfr_const_pi);
__mpfr_const_pi_prec = 0;
}
if (__mpfr_const_log2_prec != 0)
{
mpfr_clear (__mpfr_const_log2);
__mpfr_const_log2_prec = 0;
}
if (__gmp_rands_initialized)
{
gmp_randclear (__gmp_rands);
__gmp_rands_initialized = 0;
}
tests_memory_end ();
}
/* initialization function for tests using the hardware floats */
void
mpfr_test_init ()
{
double c, d;
int j;
#ifdef __mips
/* to get denormalized numbers on IRIX64 */
union fpc_csr exp;
exp.fc_word = get_fpc_csr();
exp.fc_struct.flush = 0;
set_fpc_csr(exp.fc_word);
#endif
#ifdef HAVE_DENORMS
d = DBL_MIN;
if (2.0 * (d / 2.0) != d)
{
fprintf (stderr, "Warning: no denormalized numbers\n");
exit (1);
}
#endif
#ifdef HAVE_SETFPUCW
/* sets the precision to double */
__setfpucw((_FPU_DEFAULT & (~_FPU_EXTENDED)) | _FPU_DOUBLE);
#endif
c = 1.46484375e-3;
d = 1.0;
for (j=0; j<54; j++) d *= 0.5;
d = 0.75 + d;
d /= 1 << 9;
if (c != d)
{
fprintf (stderr, "Warning: extended precision not disabled\n");
exit (1);
}
}
/* generate a random double using the whole range of possible values,
including denormalized numbers, NaN, infinities, ... */
double
drand (void)
{
double d; int *i, expo;
i = (int*) &d;
d = 1.0;
if (i[0] == 0)
expo = 1; /* little endian, exponent in i[1] */
else
expo = 0;
i[0] = LONG_RAND();
i[1] = LONG_RAND();
while (i[expo] >= 2146435072)
i[expo] = LONG_RAND(); /* avoids NaNs */
if ((LONG_RAND() % 2) && !isnan (d))
d = -d; /* generates negative numbers */
return d;
}
/* returns ulp(x) for x a 'normal' double-precision number */
double
Ulp (double x)
{
double y, eps;
if (x < 0) x = -x;
y = x * 2.220446049250313080847263336181640625e-16 ; /* x / 2^52 */
/* as ulp(x) <= y = x/2^52 < 2*ulp(x),
we have x + ulp(x) <= x + y <= x + 2*ulp(x),
therefore o(x + y) = x + ulp(x) or x + 2*ulp(x) */
eps = x + y;
eps = eps - x; /* ulp(x) or 2*ulp(x) */
return (eps > y) ? 0.5 * eps : eps;
}
/* returns the number of ulp's between a and b,
where a and b can be any floating-point number, except NaN
*/
int
ulp (double a, double b)
{
double twoa;
if (a == b) return 0; /* also deals with a=b=inf or -inf */
twoa = a + a;
if (twoa == a) /* a is +/-0.0 or +/-Inf */
return ((b < a) ? INT_MAX : -INT_MAX);
return (a - b) / Ulp (a);
}
/* return double m*2^e */
double
dbl (double m, int e)
{
if (e >=0 )
while (e-- > 0)
m *= 2.0;
else
while (e++ < 0)
m /= 2.0;
return m;
}
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