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+/* Helper function for repacking arrays.
+ Copyright 2003 Free Software Foundation, Inc.
+ Contributed by Paul Brook <paul@nowt.org>
+
+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. */
+
+#include "config.h"
+#include <stdlib.h>
+#include <assert.h>
+#include "libgfortran.h"
+
+#if defined (HAVE_GFC_COMPLEX_16)
+
+/* Allocates a block of memory with internal_malloc if the array needs
+ repacking. */
+
+GFC_COMPLEX_16 *
+internal_pack_c16 (gfc_array_c16 * 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_COMPLEX_16 *src;
+ GFC_COMPLEX_16 *dest;
+ GFC_COMPLEX_16 *destptr;
+ int n;
+ int packed;
+
+ if (source->dim[0].stride == 0)
+ {
+ source->dim[0].stride = 1;
+ return source->data;
+ }
+
+ dim = GFC_DESCRIPTOR_RANK (source);
+ ssize = 1;
+ packed = 1;
+ for (n = 0; n < dim; n++)
+ {
+ count[n] = 0;
+ stride[n] = source->dim[n].stride;
+ extent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
+ if (extent[n] <= 0)
+ {
+ /* Do nothing. */
+ packed = 1;
+ break;
+ }
+
+ if (ssize != stride[n])
+ packed = 0;
+
+ ssize *= extent[n];
+ }
+
+ if (packed)
+ return source->data;
+
+ /* Allocate storage for the destination. */
+ destptr = (GFC_COMPLEX_16 *)internal_malloc_size (ssize * sizeof (GFC_COMPLEX_16));
+ dest = destptr;
+ src = source->data;
+ 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. */
+ 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 proabably not worth it. */
+ src -= stride[n] * extent[n];
+ n++;
+ if (n == dim)
+ {
+ src = NULL;
+ break;
+ }
+ else
+ {
+ count[n]++;
+ src += stride[n];
+ }
+ }
+ }
+ return destptr;
+}
+
+#endif
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