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/* random.c -- Handle random seed in tests.
Copyright (C) 2009, 2010,
Spaces project, Inria Lorraine
Arenaire project, Inria Rhone-Alpes, France
and Lab. ANO, USTL (Univ. of Lille), France
This file is part of the MPFI Library, based on the MPFR Library.
The MPFI Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
The MPFI 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */
/* Put test_start at the beginning of your test function and
test_end at the end.
These are an adaptation of those of MPFR. */
#include "mpfi-tests.h"
#include "mpfi_config.h"
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifndef ULONG_MAX
# define ULONG_MAX 4294967295
#endif
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifndef DBL_MANT_DIG
# define DBL_MANT_DIG 53
#endif
#ifndef DBL_MAX_EXP
# define DBL_MAX_EXP +1024
#endif
gmp_randstate_t rands;
char rands_initialized;
void
test_start (void)
{
char *environment_seed;
unsigned long seed;
if (rands_initialized) {
printf ("Put test_start ONCE at the beginning of your test function.\n");
exit (1);
}
gmp_randinit_default (rands);
rands_initialized = 1;
environment_seed = getenv ("MPFI_CHECK_RANDOMIZE");
if (environment_seed == NULL)
gmp_randseed_ui (rands, 0xfac11e);
else {
seed = atoi (environment_seed);
if (seed == 0 || seed == 1) {
#if HAVE_GETTIMEOFDAY
struct timeval tv;
gettimeofday (&tv, NULL);
seed = tv.tv_sec + tv.tv_usec;
#else
time_t tv;
time (&tv);
seed = tv;
#endif
gmp_randseed_ui (rands, seed);
printf ("Seed MPFI_CHECK_RANDOMIZE=%lu "
"(include this in bug reports)\n", seed);
}
else {
printf ("Re-seeding with MPFI_CHECK_RANDOMIZE=%lu\n", seed);
gmp_randseed_ui (rands, seed);
}
}
}
void
test_end (void)
{
if (rands_initialized) {
rands_initialized = 0;
gmp_randclear (rands);
}
else {
printf ("Put test_start at the beginning of your test function.\n");
exit (1);
}
mpfr_free_cache ();
}
unsigned long
random_ui ()
{
return gmp_urandomm_ui (rands, ULONG_MAX);
}
long
random_si ()
{
return (long)gmp_urandomm_ui (rands, ULONG_MAX);
}
double
random_double ()
{
double d;
mpfr_t x;
mpfr_init2 (x, DBL_MANT_DIG + 1);
mpfr_urandomb (x, rands);
mpfr_sub_d (x, x, 0.5, MPFI_RNDD);
mpfr_mul_2ui (x, x, DBL_MAX_EXP + 1, MPFI_RNDD);
d = mpfr_get_d (x, MPFI_RNDD);
mpfr_clear (x);
return d;
}
void
random_mpz (mpz_ptr z, unsigned long n)
{
return mpz_urandomb (z, rands, n);
}
void
random_mpq (mpq_ptr q)
{
mpq_set_si (q, random_si (), random_ui ());
}
/* random endpoint with non-uniform distribution:
Prob(x == -oo) = 1/8
Prob(-oo < x < -1) = 1/4
Prob(-1 < x < 0) = 1/8
Prob(0 < x < +1) = 1/8
Prob(+1 < x < +oo) = 1/4
Prob(x == +oo) = 1/8
*/
void
random_mpfr (mpfr_ptr x)
{
unsigned long r;
r = gmp_urandomb_ui (rands, 3);
if (r < 1) {
mpfr_set_inf (x, +1);
return;
}
if (r < 2) {
mpfr_set_inf (x, -1);
return;
}
mpfr_urandomb (x, rands);
if (r < 3)
return;
if (r < 4) {
mpfr_neg (x, x, MPFI_RNDD);
return;
}
mpfr_ui_div (x, 1, x, MPFI_RNDD);
if (r < 6)
return;
mpfr_neg (x, x, MPFI_RNDD);
}
/* random interval with non-uniform distribution:
Prob(inf == -oo) = Prob(sup == +oo) = 1/8 + 7/64
Prob(-oo < inf < -1) = Prob(+1 < sup < +oo) = 3/8
Prob(-1 < inf < 0) = Prob(0 < sup < +1) = 1/16 + 5/64
Prob(0 < inf < +1) = Prob(-1 < sup < 0) = 1/16 + 3/64
Prob(+1 < inf < +oo) = Prob(-oo < sup < -1) = 1/8
Prob(inf == +oo) = Prob(sup == -oo) = 1/64
where inf = left endpoint, sup = right endpoint
*/
void
random_interval (mpfi_ptr i)
{
mpfr_t x;
mpfr_init2 (x, mpfi_get_prec (i));
random_mpfr (x);
mpfi_set_fr (i, x);
random_mpfr (x);
mpfi_put_fr (i, x);
mpfr_clear (x);
}
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