cdc5524fc8
2006-08-01 Thomas Koenig <Thomas.Koenig@online.de> PR libfortran/28542 * Makefile.am: Remove normalize.c. * aclocal.m4: Regenerate using aclocal 1.9.3. * Makefile.in: Regenerate using automake 1.9.3. * libgfortran.h: #include <float.h>. Define GFC_REAL_*_DIGITS and GFC_REAL_*_RADIX. Remove prototypes for normalize_r4_i4 and normalize_r8_i8. * intrinsics/random.c (top level): Add prototypes for random_r10, arandom_r10, random_r16 and arandom_r16. (rnumber_4): New static function. (rnumber_8): New static function. (rnumber_10): New static function. (rnumber_16): New static function. (top level): Set to kiss_size to 12 if we have REAL(KIND=16), to 8 otherwise. Define KISS_DEFAULT_SEED_1, KISS_DEFAULT_SEED_2 and KISS_DEFAULT_SEED_3. (kiss_random_kernel): Take argument to differentiate between different random number generators. (random_r4): Add argument to call to kiss_random_kernel, use rnumber_*. (random_r8): Likewise. (random_r10): New function. (random_r16): New function. (arandom_r4): Add argument to call to kiss_random_kernel, use_rnumber_*. (arandom_r8): Likewise. (arandom_r10): New function. (arandom_r16): New function. * intrinsics/rand.c (rand): Use shift and mask. * runtime/normalize.c: Remove. 2006-08-01 Thomas Koenig <Thomas.Koenig@online.de> PR libfortran/28542 * gfortran.dg/random_3.f90: New test. From-SVN: r115858
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* Implementation of the IRAND, RAND, and SRAND intrinsics.
|
|
Copyright (C) 2004, 2005 Free Software Foundation, Inc.
|
|
Contributed by Steven G. Kargl <kargls@comcast.net>.
|
|
|
|
This file is part of the GNU Fortran 95 runtime library (libgfortran).
|
|
|
|
Libgfortran 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 2 of the License, or (at your option) any later version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file into combinations with other programs,
|
|
and to distribute those combinations without any restriction coming
|
|
from the use of this file. (The General Public License restrictions
|
|
do apply in other respects; for example, they cover modification of
|
|
the file, and distribution when not linked into a combine
|
|
executable.)
|
|
|
|
Libgfortran 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 libgfortran; see the file COPYING. If not,
|
|
write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
/* Simple multiplicative congruent algorithm.
|
|
The period of this generator is approximately 2^31-1, which means that
|
|
it should not be used for anything serious. The implementation here
|
|
is based of an algorithm from S.K. Park and K.W. Miller, Comm. ACM,
|
|
31, 1192-1201 (1988). It is also provided solely for compatibility
|
|
with G77. */
|
|
|
|
#include "config.h"
|
|
#include "libgfortran.h"
|
|
#include <gthr.h>
|
|
|
|
#define GFC_RAND_A 16807
|
|
#define GFC_RAND_M 2147483647
|
|
#define GFC_RAND_M1 (GFC_RAND_M - 1)
|
|
|
|
static GFC_UINTEGER_8 rand_seed = 1;
|
|
#ifdef __GTHREAD_MUTEX_INIT
|
|
static __gthread_mutex_t rand_seed_lock = __GTHREAD_MUTEX_INIT;
|
|
#else
|
|
static __gthread_mutex_t rand_seed_lock;
|
|
#endif
|
|
|
|
|
|
/* Set the seed of the irand generator. Note 0 is a bad seed. */
|
|
|
|
static void
|
|
srand_internal (GFC_INTEGER_8 i)
|
|
{
|
|
rand_seed = i ? i : 123459876;
|
|
}
|
|
|
|
extern void PREFIX(srand) (GFC_INTEGER_4 *i);
|
|
export_proto_np(PREFIX(srand));
|
|
|
|
void
|
|
PREFIX(srand) (GFC_INTEGER_4 *i)
|
|
{
|
|
__gthread_mutex_lock (&rand_seed_lock);
|
|
srand_internal (*i);
|
|
__gthread_mutex_unlock (&rand_seed_lock);
|
|
}
|
|
|
|
/* Return an INTEGER in the range [1,GFC_RAND_M-1]. */
|
|
|
|
extern GFC_INTEGER_4 irand (GFC_INTEGER_4 *);
|
|
iexport_proto(irand);
|
|
|
|
GFC_INTEGER_4
|
|
irand (GFC_INTEGER_4 *i)
|
|
{
|
|
GFC_INTEGER_4 j;
|
|
if (i)
|
|
j = *i;
|
|
else
|
|
j = 0;
|
|
|
|
__gthread_mutex_lock (&rand_seed_lock);
|
|
|
|
switch (j)
|
|
{
|
|
/* Return the next RN. */
|
|
case 0:
|
|
break;
|
|
|
|
/* Reset the RN sequence to system-dependent sequence and return the
|
|
first value. */
|
|
case 1:
|
|
srand_internal (0);
|
|
break;
|
|
|
|
/* Seed the RN sequence with j and return the first value. */
|
|
default:
|
|
srand_internal (j);
|
|
break;
|
|
}
|
|
|
|
rand_seed = GFC_RAND_A * rand_seed % GFC_RAND_M;
|
|
j = (GFC_INTEGER_4) rand_seed;
|
|
|
|
__gthread_mutex_unlock (&rand_seed_lock);
|
|
|
|
return j;
|
|
}
|
|
iexport(irand);
|
|
|
|
|
|
/* Return a random REAL in the range [0,1). */
|
|
|
|
extern GFC_REAL_4 PREFIX(rand) (GFC_INTEGER_4 *i);
|
|
export_proto_np(PREFIX(rand));
|
|
|
|
GFC_REAL_4
|
|
PREFIX(rand) (GFC_INTEGER_4 *i)
|
|
{
|
|
GFC_UINTEGER_4 mask;
|
|
#if GFC_REAL_4_RADIX == 2
|
|
mask = ~ (GFC_UINTEGER_4) 0u << (32 - GFC_REAL_4_DIGITS + 1);
|
|
#elif GFC_REAL_4_RADIX == 16
|
|
mask = ~ (GFC_UINTEGER_4) 0u << ((8 - GFC_REAL_4_DIGITS) * 4 + 1);
|
|
#else
|
|
#error "GFC_REAL_4_RADIX has unknown value"
|
|
#endif
|
|
return ((GFC_UINTEGER_4) (irand(i) -1) & mask) * (GFC_REAL_4) 0x1.p-31f;
|
|
}
|
|
|
|
#ifndef __GTHREAD_MUTEX_INIT
|
|
static void __attribute__((constructor))
|
|
init (void)
|
|
{
|
|
__GTHREAD_MUTEX_INIT_FUNCTION (&rand_seed_lock);
|
|
}
|
|
#endif
|