mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-22 04:30:03 +00:00
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* Helper function for repacking arrays.
|
|
Copyright (C) 2003-2019 Free Software Foundation, Inc.
|
|
Contributed by Paul Brook <paul@nowt.org>
|
|
|
|
This file is part of the GNU Fortran 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.
|
|
|
|
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.
|
|
|
|
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"
|
|
|
|
|
|
#if defined (HAVE_GFC_REAL_8)
|
|
|
|
/* Allocates a block of memory with internal_malloc if the array needs
|
|
repacking. */
|
|
|
|
GFC_REAL_8 *
|
|
internal_pack_r8 (gfc_array_r8 * source)
|
|
{
|
|
index_type count[GFC_MAX_DIMENSIONS];
|
|
index_type extent[GFC_MAX_DIMENSIONS];
|
|
index_type stride[GFC_MAX_DIMENSIONS];
|
|
index_type stride0;
|
|
index_type dim;
|
|
index_type ssize;
|
|
const GFC_REAL_8 *src;
|
|
GFC_REAL_8 * restrict dest;
|
|
GFC_REAL_8 *destptr;
|
|
int packed;
|
|
|
|
/* TODO: Investigate how we can figure out if this is a temporary
|
|
since the stride=0 thing has been removed from the frontend. */
|
|
|
|
dim = GFC_DESCRIPTOR_RANK (source);
|
|
ssize = 1;
|
|
packed = 1;
|
|
for (index_type n = 0; n < dim; n++)
|
|
{
|
|
count[n] = 0;
|
|
stride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
|
|
extent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
|
|
if (extent[n] <= 0)
|
|
{
|
|
/* Do nothing. */
|
|
packed = 1;
|
|
break;
|
|
}
|
|
|
|
if (ssize != stride[n])
|
|
packed = 0;
|
|
|
|
ssize *= extent[n];
|
|
}
|
|
|
|
if (packed)
|
|
return source->base_addr;
|
|
|
|
/* Allocate storage for the destination. */
|
|
destptr = xmallocarray (ssize, sizeof (GFC_REAL_8));
|
|
dest = destptr;
|
|
src = source->base_addr;
|
|
stride0 = stride[0];
|
|
|
|
|
|
while (src)
|
|
{
|
|
/* Copy the data. */
|
|
*(dest++) = *src;
|
|
/* Advance to the next element. */
|
|
src += stride0;
|
|
count[0]++;
|
|
/* Advance to the next source element. */
|
|
index_type 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. */
|
|
src -= stride[n] * extent[n];
|
|
n++;
|
|
if (n == dim)
|
|
{
|
|
src = NULL;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
count[n]++;
|
|
src += stride[n];
|
|
}
|
|
}
|
|
}
|
|
return destptr;
|
|
}
|
|
|
|
#endif
|
|
|