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117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* Helper function for repacking arrays.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#if defined (HAVE_GFC_REAL_8)
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/* Allocates a block of memory with internal_malloc if the array needs
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repacking. */
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GFC_REAL_8 *
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internal_pack_r8 (gfc_array_r8 * source)
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{
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index_type count[GFC_MAX_DIMENSIONS];
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index_type extent[GFC_MAX_DIMENSIONS];
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index_type stride[GFC_MAX_DIMENSIONS];
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index_type stride0;
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index_type dim;
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index_type ssize;
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const GFC_REAL_8 *src;
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GFC_REAL_8 * restrict dest;
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GFC_REAL_8 *destptr;
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int packed;
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/* TODO: Investigate how we can figure out if this is a temporary
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since the stride=0 thing has been removed from the frontend. */
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dim = GFC_DESCRIPTOR_RANK (source);
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ssize = 1;
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packed = 1;
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for (index_type n = 0; n < dim; n++)
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{
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count[n] = 0;
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stride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
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extent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
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if (extent[n] <= 0)
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{
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/* Do nothing. */
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packed = 1;
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break;
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}
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if (ssize != stride[n])
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packed = 0;
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ssize *= extent[n];
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}
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if (packed)
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return source->base_addr;
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/* Allocate storage for the destination. */
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destptr = xmallocarray (ssize, sizeof (GFC_REAL_8));
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dest = destptr;
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src = source->base_addr;
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stride0 = stride[0];
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while (src)
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{
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/* Copy the data. */
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*(dest++) = *src;
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/* Advance to the next element. */
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src += stride0;
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count[0]++;
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/* Advance to the next source element. */
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index_type n = 0;
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while (count[n] == extent[n])
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{
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/* When we get to the end of a dimension, reset it and increment
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the next dimension. */
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count[n] = 0;
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/* We could precalculate these products, but this is a less
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frequently used path so probably not worth it. */
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src -= stride[n] * extent[n];
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n++;
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if (n == dim)
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{
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src = NULL;
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break;
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}
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else
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{
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count[n]++;
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src += stride[n];
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}
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}
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}
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return destptr;
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}
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#endif
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