798 lines
22 KiB
C
798 lines
22 KiB
C
/* Implementation of the RANDOM intrinsics
|
|
Copyright 2002, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
|
|
Contributed by Lars Segerlund <seger@linuxmail.org>
|
|
and Steve Kargl.
|
|
|
|
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 3 of the License, or (at your option) any later version.
|
|
|
|
Ligbfortran 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.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "libgfortran.h"
|
|
#include <gthr.h>
|
|
#include <string.h>
|
|
|
|
extern void random_r4 (GFC_REAL_4 *);
|
|
iexport_proto(random_r4);
|
|
|
|
extern void random_r8 (GFC_REAL_8 *);
|
|
iexport_proto(random_r8);
|
|
|
|
extern void arandom_r4 (gfc_array_r4 *);
|
|
export_proto(arandom_r4);
|
|
|
|
extern void arandom_r8 (gfc_array_r8 *);
|
|
export_proto(arandom_r8);
|
|
|
|
#ifdef HAVE_GFC_REAL_10
|
|
|
|
extern void random_r10 (GFC_REAL_10 *);
|
|
iexport_proto(random_r10);
|
|
|
|
extern void arandom_r10 (gfc_array_r10 *);
|
|
export_proto(arandom_r10);
|
|
|
|
#endif
|
|
|
|
#ifdef HAVE_GFC_REAL_16
|
|
|
|
extern void random_r16 (GFC_REAL_16 *);
|
|
iexport_proto(random_r16);
|
|
|
|
extern void arandom_r16 (gfc_array_r16 *);
|
|
export_proto(arandom_r16);
|
|
|
|
#endif
|
|
|
|
#ifdef __GTHREAD_MUTEX_INIT
|
|
static __gthread_mutex_t random_lock = __GTHREAD_MUTEX_INIT;
|
|
#else
|
|
static __gthread_mutex_t random_lock;
|
|
#endif
|
|
|
|
/* Helper routines to map a GFC_UINTEGER_* to the corresponding
|
|
GFC_REAL_* types in the range of [0,1). If GFC_REAL_*_RADIX are 2
|
|
or 16, respectively, we mask off the bits that don't fit into the
|
|
correct GFC_REAL_*, convert to the real type, then multiply by the
|
|
correct offset. */
|
|
|
|
|
|
static inline void
|
|
rnumber_4 (GFC_REAL_4 *f, GFC_UINTEGER_4 v)
|
|
{
|
|
GFC_UINTEGER_4 mask;
|
|
#if GFC_REAL_4_RADIX == 2
|
|
mask = ~ (GFC_UINTEGER_4) 0u << (32 - GFC_REAL_4_DIGITS);
|
|
#elif GFC_REAL_4_RADIX == 16
|
|
mask = ~ (GFC_UINTEGER_4) 0u << ((8 - GFC_REAL_4_DIGITS) * 4);
|
|
#else
|
|
#error "GFC_REAL_4_RADIX has unknown value"
|
|
#endif
|
|
v = v & mask;
|
|
*f = (GFC_REAL_4) v * (GFC_REAL_4) 0x1.p-32f;
|
|
}
|
|
|
|
static inline void
|
|
rnumber_8 (GFC_REAL_8 *f, GFC_UINTEGER_8 v)
|
|
{
|
|
GFC_UINTEGER_8 mask;
|
|
#if GFC_REAL_8_RADIX == 2
|
|
mask = ~ (GFC_UINTEGER_8) 0u << (64 - GFC_REAL_8_DIGITS);
|
|
#elif GFC_REAL_8_RADIX == 16
|
|
mask = ~ (GFC_UINTEGER_8) 0u << (16 - GFC_REAL_8_DIGITS) * 4);
|
|
#else
|
|
#error "GFC_REAL_8_RADIX has unknown value"
|
|
#endif
|
|
v = v & mask;
|
|
*f = (GFC_REAL_8) v * (GFC_REAL_8) 0x1.p-64;
|
|
}
|
|
|
|
#ifdef HAVE_GFC_REAL_10
|
|
|
|
static inline void
|
|
rnumber_10 (GFC_REAL_10 *f, GFC_UINTEGER_8 v)
|
|
{
|
|
GFC_UINTEGER_8 mask;
|
|
#if GFC_REAL_10_RADIX == 2
|
|
mask = ~ (GFC_UINTEGER_8) 0u << (64 - GFC_REAL_10_DIGITS);
|
|
#elif GFC_REAL_10_RADIX == 16
|
|
mask = ~ (GFC_UINTEGER_10) 0u << ((16 - GFC_REAL_10_DIGITS) * 4);
|
|
#else
|
|
#error "GFC_REAL_10_RADIX has unknown value"
|
|
#endif
|
|
v = v & mask;
|
|
*f = (GFC_REAL_10) v * (GFC_REAL_10) 0x1.p-64;
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_GFC_REAL_16
|
|
|
|
/* For REAL(KIND=16), we only need to mask off the lower bits. */
|
|
|
|
static inline void
|
|
rnumber_16 (GFC_REAL_16 *f, GFC_UINTEGER_8 v1, GFC_UINTEGER_8 v2)
|
|
{
|
|
GFC_UINTEGER_8 mask;
|
|
#if GFC_REAL_16_RADIX == 2
|
|
mask = ~ (GFC_UINTEGER_8) 0u << (128 - GFC_REAL_16_DIGITS);
|
|
#elif GFC_REAL_16_RADIX == 16
|
|
mask = ~ (GFC_UINTEGER_8) 0u << ((32 - GFC_REAL_16_DIGITS) * 4);
|
|
#else
|
|
#error "GFC_REAL_16_RADIX has unknown value"
|
|
#endif
|
|
v2 = v2 & mask;
|
|
*f = (GFC_REAL_16) v1 * (GFC_REAL_16) 0x1.p-64
|
|
+ (GFC_REAL_16) v2 * (GFC_REAL_16) 0x1.p-128;
|
|
}
|
|
#endif
|
|
/* libgfortran previously had a Mersenne Twister, taken from the paper:
|
|
|
|
Mersenne Twister: 623-dimensionally equidistributed
|
|
uniform pseudorandom generator.
|
|
|
|
by Makoto Matsumoto & Takuji Nishimura
|
|
which appeared in the: ACM Transactions on Modelling and Computer
|
|
Simulations: Special Issue on Uniform Random Number
|
|
Generation. ( Early in 1998 ).
|
|
|
|
The Mersenne Twister code was replaced due to
|
|
|
|
(1) Simple user specified seeds lead to really bad sequences for
|
|
nearly 100000 random numbers.
|
|
(2) open(), read(), and close() were not properly declared via header
|
|
files.
|
|
(3) The global index i was abused and caused unexpected behavior with
|
|
GET and PUT.
|
|
(4) See PR 15619.
|
|
|
|
|
|
libgfortran currently uses George Marsaglia's KISS (Keep It Simple Stupid)
|
|
random number generator. This PRNG combines:
|
|
|
|
(1) The congruential generator x(n)=69069*x(n-1)+1327217885 with a period
|
|
of 2^32,
|
|
(2) A 3-shift shift-register generator with a period of 2^32-1,
|
|
(3) Two 16-bit multiply-with-carry generators with a period of
|
|
597273182964842497 > 2^59.
|
|
|
|
The overall period exceeds 2^123.
|
|
|
|
http://www.ciphersbyritter.com/NEWS4/RANDC.HTM#369F6FCA.74C7C041@stat.fsu.edu
|
|
|
|
The above web site has an archive of a newsgroup posting from George
|
|
Marsaglia with the statement:
|
|
|
|
Subject: Random numbers for C: Improvements.
|
|
Date: Fri, 15 Jan 1999 11:41:47 -0500
|
|
From: George Marsaglia <geo@stat.fsu.edu>
|
|
Message-ID: <369F6FCA.74C7C041@stat.fsu.edu>
|
|
References: <369B5E30.65A55FD1@stat.fsu.edu>
|
|
Newsgroups: sci.stat.math,sci.math,sci.math.numer-analysis
|
|
Lines: 93
|
|
|
|
As I hoped, several suggestions have led to
|
|
improvements in the code for RNG's I proposed for
|
|
use in C. (See the thread "Random numbers for C: Some
|
|
suggestions" in previous postings.) The improved code
|
|
is listed below.
|
|
|
|
A question of copyright has also been raised. Unlike
|
|
DIEHARD, there is no copyright on the code below. You
|
|
are free to use it in any way you want, but you may
|
|
wish to acknowledge the source, as a courtesy.
|
|
|
|
"There is no copyright on the code below." included the original
|
|
KISS algorithm. */
|
|
|
|
/* We use three KISS random number generators, with different
|
|
seeds.
|
|
As a matter of Quality of Implementation, the random numbers
|
|
we generate for different REAL kinds, starting from the same
|
|
seed, are always the same up to the precision of these types.
|
|
We do this by using three generators with different seeds, the
|
|
first one always for the most significant bits, the second one
|
|
for bits 33..64 (if present in the REAL kind), and the third one
|
|
(called twice) for REAL(16). */
|
|
|
|
#define GFC_SL(k, n) ((k)^((k)<<(n)))
|
|
#define GFC_SR(k, n) ((k)^((k)>>(n)))
|
|
|
|
/* Reference for the seed:
|
|
From: "George Marsaglia" <g...@stat.fsu.edu>
|
|
Newsgroups: sci.math
|
|
Message-ID: <e7CcnWxczriWssCjXTWc3A@comcast.com>
|
|
|
|
The KISS RNG uses four seeds, x, y, z, c,
|
|
with 0<=x<2^32, 0<y<2^32, 0<=z<2^32, 0<=c<698769069
|
|
except that the two pairs
|
|
z=0,c=0 and z=2^32-1,c=698769068
|
|
should be avoided. */
|
|
|
|
/* Any modifications to the seeds that change kiss_size below need to be
|
|
reflected in check.c (gfc_check_random_seed) to enable correct
|
|
compile-time checking of PUT size for the RANDOM_SEED intrinsic. */
|
|
|
|
#define KISS_DEFAULT_SEED_1 123456789, 362436069, 521288629, 316191069
|
|
#define KISS_DEFAULT_SEED_2 987654321, 458629013, 582859209, 438195021
|
|
#ifdef HAVE_GFC_REAL_16
|
|
#define KISS_DEFAULT_SEED_3 573658661, 185639104, 582619469, 296736107
|
|
#endif
|
|
|
|
static GFC_UINTEGER_4 kiss_seed[] = {
|
|
KISS_DEFAULT_SEED_1,
|
|
KISS_DEFAULT_SEED_2,
|
|
#ifdef HAVE_GFC_REAL_16
|
|
KISS_DEFAULT_SEED_3
|
|
#endif
|
|
};
|
|
|
|
static GFC_UINTEGER_4 kiss_default_seed[] = {
|
|
KISS_DEFAULT_SEED_1,
|
|
KISS_DEFAULT_SEED_2,
|
|
#ifdef HAVE_GFC_REAL_16
|
|
KISS_DEFAULT_SEED_3
|
|
#endif
|
|
};
|
|
|
|
static const GFC_INTEGER_4 kiss_size = sizeof(kiss_seed)/sizeof(kiss_seed[0]);
|
|
|
|
static GFC_UINTEGER_4 * const kiss_seed_1 = kiss_seed;
|
|
static GFC_UINTEGER_4 * const kiss_seed_2 = kiss_seed + 4;
|
|
|
|
#ifdef HAVE_GFC_REAL_16
|
|
static GFC_UINTEGER_4 * const kiss_seed_3 = kiss_seed + 8;
|
|
#endif
|
|
|
|
/* kiss_random_kernel() returns an integer value in the range of
|
|
(0, GFC_UINTEGER_4_HUGE]. The distribution of pseudorandom numbers
|
|
should be uniform. */
|
|
|
|
static GFC_UINTEGER_4
|
|
kiss_random_kernel(GFC_UINTEGER_4 * seed)
|
|
{
|
|
GFC_UINTEGER_4 kiss;
|
|
|
|
seed[0] = 69069 * seed[0] + 1327217885;
|
|
seed[1] = GFC_SL(GFC_SR(GFC_SL(seed[1],13),17),5);
|
|
seed[2] = 18000 * (seed[2] & 65535) + (seed[2] >> 16);
|
|
seed[3] = 30903 * (seed[3] & 65535) + (seed[3] >> 16);
|
|
kiss = seed[0] + seed[1] + (seed[2] << 16) + seed[3];
|
|
|
|
return kiss;
|
|
}
|
|
|
|
/* This function produces a REAL(4) value from the uniform distribution
|
|
with range [0,1). */
|
|
|
|
void
|
|
random_r4 (GFC_REAL_4 *x)
|
|
{
|
|
GFC_UINTEGER_4 kiss;
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
kiss = kiss_random_kernel (kiss_seed_1);
|
|
rnumber_4 (x, kiss);
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
iexport(random_r4);
|
|
|
|
/* This function produces a REAL(8) value from the uniform distribution
|
|
with range [0,1). */
|
|
|
|
void
|
|
random_r8 (GFC_REAL_8 *x)
|
|
{
|
|
GFC_UINTEGER_8 kiss;
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
kiss = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_1)) << 32;
|
|
kiss += kiss_random_kernel (kiss_seed_2);
|
|
rnumber_8 (x, kiss);
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
iexport(random_r8);
|
|
|
|
#ifdef HAVE_GFC_REAL_10
|
|
|
|
/* This function produces a REAL(10) value from the uniform distribution
|
|
with range [0,1). */
|
|
|
|
void
|
|
random_r10 (GFC_REAL_10 *x)
|
|
{
|
|
GFC_UINTEGER_8 kiss;
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
kiss = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_1)) << 32;
|
|
kiss += kiss_random_kernel (kiss_seed_2);
|
|
rnumber_10 (x, kiss);
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
iexport(random_r10);
|
|
|
|
#endif
|
|
|
|
/* This function produces a REAL(16) value from the uniform distribution
|
|
with range [0,1). */
|
|
|
|
#ifdef HAVE_GFC_REAL_16
|
|
|
|
void
|
|
random_r16 (GFC_REAL_16 *x)
|
|
{
|
|
GFC_UINTEGER_8 kiss1, kiss2;
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
kiss1 = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_1)) << 32;
|
|
kiss1 += kiss_random_kernel (kiss_seed_2);
|
|
|
|
kiss2 = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_3)) << 32;
|
|
kiss2 += kiss_random_kernel (kiss_seed_3);
|
|
|
|
rnumber_16 (x, kiss1, kiss2);
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
iexport(random_r16);
|
|
|
|
|
|
#endif
|
|
/* This function fills a REAL(4) array with values from the uniform
|
|
distribution with range [0,1). */
|
|
|
|
void
|
|
arandom_r4 (gfc_array_r4 *x)
|
|
{
|
|
index_type count[GFC_MAX_DIMENSIONS];
|
|
index_type extent[GFC_MAX_DIMENSIONS];
|
|
index_type stride[GFC_MAX_DIMENSIONS];
|
|
index_type stride0;
|
|
index_type dim;
|
|
GFC_REAL_4 *dest;
|
|
GFC_UINTEGER_4 kiss;
|
|
int n;
|
|
|
|
dest = x->data;
|
|
|
|
dim = GFC_DESCRIPTOR_RANK (x);
|
|
|
|
for (n = 0; n < dim; n++)
|
|
{
|
|
count[n] = 0;
|
|
stride[n] = GFC_DESCRIPTOR_STRIDE(x,n);
|
|
extent[n] = GFC_DESCRIPTOR_EXTENT(x,n);
|
|
if (extent[n] <= 0)
|
|
return;
|
|
}
|
|
|
|
stride0 = stride[0];
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
|
|
while (dest)
|
|
{
|
|
/* random_r4 (dest); */
|
|
kiss = kiss_random_kernel (kiss_seed_1);
|
|
rnumber_4 (dest, kiss);
|
|
|
|
/* Advance to the next element. */
|
|
dest += stride0;
|
|
count[0]++;
|
|
/* Advance to the next source element. */
|
|
n = 0;
|
|
while (count[n] == extent[n])
|
|
{
|
|
/* When we get to the end of a dimension, reset it and increment
|
|
the next dimension. */
|
|
count[n] = 0;
|
|
/* We could precalculate these products, but this is a less
|
|
frequently used path so probably not worth it. */
|
|
dest -= stride[n] * extent[n];
|
|
n++;
|
|
if (n == dim)
|
|
{
|
|
dest = NULL;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
count[n]++;
|
|
dest += stride[n];
|
|
}
|
|
}
|
|
}
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
|
|
/* This function fills a REAL(8) array with values from the uniform
|
|
distribution with range [0,1). */
|
|
|
|
void
|
|
arandom_r8 (gfc_array_r8 *x)
|
|
{
|
|
index_type count[GFC_MAX_DIMENSIONS];
|
|
index_type extent[GFC_MAX_DIMENSIONS];
|
|
index_type stride[GFC_MAX_DIMENSIONS];
|
|
index_type stride0;
|
|
index_type dim;
|
|
GFC_REAL_8 *dest;
|
|
GFC_UINTEGER_8 kiss;
|
|
int n;
|
|
|
|
dest = x->data;
|
|
|
|
dim = GFC_DESCRIPTOR_RANK (x);
|
|
|
|
for (n = 0; n < dim; n++)
|
|
{
|
|
count[n] = 0;
|
|
stride[n] = GFC_DESCRIPTOR_STRIDE(x,n);
|
|
extent[n] = GFC_DESCRIPTOR_EXTENT(x,n);
|
|
if (extent[n] <= 0)
|
|
return;
|
|
}
|
|
|
|
stride0 = stride[0];
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
|
|
while (dest)
|
|
{
|
|
/* random_r8 (dest); */
|
|
kiss = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_1)) << 32;
|
|
kiss += kiss_random_kernel (kiss_seed_2);
|
|
rnumber_8 (dest, kiss);
|
|
|
|
/* Advance to the next element. */
|
|
dest += stride0;
|
|
count[0]++;
|
|
/* Advance to the next source element. */
|
|
n = 0;
|
|
while (count[n] == extent[n])
|
|
{
|
|
/* When we get to the end of a dimension, reset it and increment
|
|
the next dimension. */
|
|
count[n] = 0;
|
|
/* We could precalculate these products, but this is a less
|
|
frequently used path so probably not worth it. */
|
|
dest -= stride[n] * extent[n];
|
|
n++;
|
|
if (n == dim)
|
|
{
|
|
dest = NULL;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
count[n]++;
|
|
dest += stride[n];
|
|
}
|
|
}
|
|
}
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
|
|
#ifdef HAVE_GFC_REAL_10
|
|
|
|
/* This function fills a REAL(10) array with values from the uniform
|
|
distribution with range [0,1). */
|
|
|
|
void
|
|
arandom_r10 (gfc_array_r10 *x)
|
|
{
|
|
index_type count[GFC_MAX_DIMENSIONS];
|
|
index_type extent[GFC_MAX_DIMENSIONS];
|
|
index_type stride[GFC_MAX_DIMENSIONS];
|
|
index_type stride0;
|
|
index_type dim;
|
|
GFC_REAL_10 *dest;
|
|
GFC_UINTEGER_8 kiss;
|
|
int n;
|
|
|
|
dest = x->data;
|
|
|
|
dim = GFC_DESCRIPTOR_RANK (x);
|
|
|
|
for (n = 0; n < dim; n++)
|
|
{
|
|
count[n] = 0;
|
|
stride[n] = GFC_DESCRIPTOR_STRIDE(x,n);
|
|
extent[n] = GFC_DESCRIPTOR_EXTENT(x,n);
|
|
if (extent[n] <= 0)
|
|
return;
|
|
}
|
|
|
|
stride0 = stride[0];
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
|
|
while (dest)
|
|
{
|
|
/* random_r10 (dest); */
|
|
kiss = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_1)) << 32;
|
|
kiss += kiss_random_kernel (kiss_seed_2);
|
|
rnumber_10 (dest, kiss);
|
|
|
|
/* Advance to the next element. */
|
|
dest += stride0;
|
|
count[0]++;
|
|
/* Advance to the next source element. */
|
|
n = 0;
|
|
while (count[n] == extent[n])
|
|
{
|
|
/* When we get to the end of a dimension, reset it and increment
|
|
the next dimension. */
|
|
count[n] = 0;
|
|
/* We could precalculate these products, but this is a less
|
|
frequently used path so probably not worth it. */
|
|
dest -= stride[n] * extent[n];
|
|
n++;
|
|
if (n == dim)
|
|
{
|
|
dest = NULL;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
count[n]++;
|
|
dest += stride[n];
|
|
}
|
|
}
|
|
}
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef HAVE_GFC_REAL_16
|
|
|
|
/* This function fills a REAL(16) array with values from the uniform
|
|
distribution with range [0,1). */
|
|
|
|
void
|
|
arandom_r16 (gfc_array_r16 *x)
|
|
{
|
|
index_type count[GFC_MAX_DIMENSIONS];
|
|
index_type extent[GFC_MAX_DIMENSIONS];
|
|
index_type stride[GFC_MAX_DIMENSIONS];
|
|
index_type stride0;
|
|
index_type dim;
|
|
GFC_REAL_16 *dest;
|
|
GFC_UINTEGER_8 kiss1, kiss2;
|
|
int n;
|
|
|
|
dest = x->data;
|
|
|
|
dim = GFC_DESCRIPTOR_RANK (x);
|
|
|
|
for (n = 0; n < dim; n++)
|
|
{
|
|
count[n] = 0;
|
|
stride[n] = GFC_DESCRIPTOR_STRIDE(x,n);
|
|
extent[n] = GFC_DESCRIPTOR_EXTENT(x,n);
|
|
if (extent[n] <= 0)
|
|
return;
|
|
}
|
|
|
|
stride0 = stride[0];
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
|
|
while (dest)
|
|
{
|
|
/* random_r16 (dest); */
|
|
kiss1 = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_1)) << 32;
|
|
kiss1 += kiss_random_kernel (kiss_seed_2);
|
|
|
|
kiss2 = ((GFC_UINTEGER_8) kiss_random_kernel (kiss_seed_3)) << 32;
|
|
kiss2 += kiss_random_kernel (kiss_seed_3);
|
|
|
|
rnumber_16 (dest, kiss1, kiss2);
|
|
|
|
/* Advance to the next element. */
|
|
dest += stride0;
|
|
count[0]++;
|
|
/* Advance to the next source element. */
|
|
n = 0;
|
|
while (count[n] == extent[n])
|
|
{
|
|
/* When we get to the end of a dimension, reset it and increment
|
|
the next dimension. */
|
|
count[n] = 0;
|
|
/* We could precalculate these products, but this is a less
|
|
frequently used path so probably not worth it. */
|
|
dest -= stride[n] * extent[n];
|
|
n++;
|
|
if (n == dim)
|
|
{
|
|
dest = NULL;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
count[n]++;
|
|
dest += stride[n];
|
|
}
|
|
}
|
|
}
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static void
|
|
scramble_seed (unsigned char *dest, unsigned char *src, int size)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
dest[(i % 2) * (size / 2) + i / 2] = src[i];
|
|
}
|
|
|
|
|
|
static void
|
|
unscramble_seed (unsigned char *dest, unsigned char *src, int size)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
dest[i] = src[(i % 2) * (size / 2) + i / 2];
|
|
}
|
|
|
|
|
|
|
|
/* random_seed is used to seed the PRNG with either a default
|
|
set of seeds or user specified set of seeds. random_seed
|
|
must be called with no argument or exactly one argument. */
|
|
|
|
void
|
|
random_seed_i4 (GFC_INTEGER_4 *size, gfc_array_i4 *put, gfc_array_i4 *get)
|
|
{
|
|
int i;
|
|
unsigned char seed[4*kiss_size];
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
|
|
/* Check that we only have one argument present. */
|
|
if ((size ? 1 : 0) + (put ? 1 : 0) + (get ? 1 : 0) > 1)
|
|
runtime_error ("RANDOM_SEED should have at most one argument present.");
|
|
|
|
/* From the standard: "If no argument is present, the processor assigns
|
|
a processor-dependent value to the seed." */
|
|
if (size == NULL && put == NULL && get == NULL)
|
|
for (i = 0; i < kiss_size; i++)
|
|
kiss_seed[i] = kiss_default_seed[i];
|
|
|
|
if (size != NULL)
|
|
*size = kiss_size;
|
|
|
|
if (put != NULL)
|
|
{
|
|
/* If the rank of the array is not 1, abort. */
|
|
if (GFC_DESCRIPTOR_RANK (put) != 1)
|
|
runtime_error ("Array rank of PUT is not 1.");
|
|
|
|
/* If the array is too small, abort. */
|
|
if (GFC_DESCRIPTOR_EXTENT(put,0) < kiss_size)
|
|
runtime_error ("Array size of PUT is too small.");
|
|
|
|
/* We copy the seed given by the user. */
|
|
for (i = 0; i < kiss_size; i++)
|
|
memcpy (seed + i * sizeof(GFC_UINTEGER_4),
|
|
&(put->data[(kiss_size - 1 - i) * GFC_DESCRIPTOR_STRIDE(put,0)]),
|
|
sizeof(GFC_UINTEGER_4));
|
|
|
|
/* We put it after scrambling the bytes, to paper around users who
|
|
provide seeds with quality only in the lower or upper part. */
|
|
scramble_seed ((unsigned char *) kiss_seed, seed, 4*kiss_size);
|
|
}
|
|
|
|
/* Return the seed to GET data. */
|
|
if (get != NULL)
|
|
{
|
|
/* If the rank of the array is not 1, abort. */
|
|
if (GFC_DESCRIPTOR_RANK (get) != 1)
|
|
runtime_error ("Array rank of GET is not 1.");
|
|
|
|
/* If the array is too small, abort. */
|
|
if (GFC_DESCRIPTOR_EXTENT(get,0) < kiss_size)
|
|
runtime_error ("Array size of GET is too small.");
|
|
|
|
/* Unscramble the seed. */
|
|
unscramble_seed (seed, (unsigned char *) kiss_seed, 4*kiss_size);
|
|
|
|
/* Then copy it back to the user variable. */
|
|
for (i = 0; i < kiss_size; i++)
|
|
memcpy (&(get->data[(kiss_size - 1 - i) * GFC_DESCRIPTOR_STRIDE(get,0)]),
|
|
seed + i * sizeof(GFC_UINTEGER_4),
|
|
sizeof(GFC_UINTEGER_4));
|
|
}
|
|
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
iexport(random_seed_i4);
|
|
|
|
|
|
void
|
|
random_seed_i8 (GFC_INTEGER_8 *size, gfc_array_i8 *put, gfc_array_i8 *get)
|
|
{
|
|
int i;
|
|
|
|
__gthread_mutex_lock (&random_lock);
|
|
|
|
/* Check that we only have one argument present. */
|
|
if ((size ? 1 : 0) + (put ? 1 : 0) + (get ? 1 : 0) > 1)
|
|
runtime_error ("RANDOM_SEED should have at most one argument present.");
|
|
|
|
/* From the standard: "If no argument is present, the processor assigns
|
|
a processor-dependent value to the seed." */
|
|
if (size == NULL && put == NULL && get == NULL)
|
|
for (i = 0; i < kiss_size; i++)
|
|
kiss_seed[i] = kiss_default_seed[i];
|
|
|
|
if (size != NULL)
|
|
*size = kiss_size / 2;
|
|
|
|
if (put != NULL)
|
|
{
|
|
/* If the rank of the array is not 1, abort. */
|
|
if (GFC_DESCRIPTOR_RANK (put) != 1)
|
|
runtime_error ("Array rank of PUT is not 1.");
|
|
|
|
/* If the array is too small, abort. */
|
|
if (GFC_DESCRIPTOR_EXTENT(put,0) < kiss_size / 2)
|
|
runtime_error ("Array size of PUT is too small.");
|
|
|
|
/* This code now should do correct strides. */
|
|
for (i = 0; i < kiss_size / 2; i++)
|
|
memcpy (&kiss_seed[2*i], &(put->data[i * GFC_DESCRIPTOR_STRIDE(put,0)]),
|
|
sizeof (GFC_UINTEGER_8));
|
|
}
|
|
|
|
/* Return the seed to GET data. */
|
|
if (get != NULL)
|
|
{
|
|
/* If the rank of the array is not 1, abort. */
|
|
if (GFC_DESCRIPTOR_RANK (get) != 1)
|
|
runtime_error ("Array rank of GET is not 1.");
|
|
|
|
/* If the array is too small, abort. */
|
|
if (GFC_DESCRIPTOR_EXTENT(get,0) < kiss_size / 2)
|
|
runtime_error ("Array size of GET is too small.");
|
|
|
|
/* This code now should do correct strides. */
|
|
for (i = 0; i < kiss_size / 2; i++)
|
|
memcpy (&(get->data[i * GFC_DESCRIPTOR_STRIDE(get,0)]), &kiss_seed[2*i],
|
|
sizeof (GFC_UINTEGER_8));
|
|
}
|
|
|
|
__gthread_mutex_unlock (&random_lock);
|
|
}
|
|
iexport(random_seed_i8);
|
|
|
|
|
|
#ifndef __GTHREAD_MUTEX_INIT
|
|
static void __attribute__((constructor))
|
|
init (void)
|
|
{
|
|
__GTHREAD_MUTEX_INIT_FUNCTION (&random_lock);
|
|
}
|
|
#endif
|