116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
/* Helper function for repacking arrays.
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Copyright 2003 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 95 runtime library (libgfortran).
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Libgfor is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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Ligbfor 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfortran; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <stdlib.h>
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#include <assert.h>
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#include "libgfortran.h"
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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_INTEGER_4 *
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internal_pack_4 (gfc_array_i4 * source)
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{
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index_type count[GFC_MAX_DIMENSIONS - 1];
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index_type extent[GFC_MAX_DIMENSIONS - 1];
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index_type stride[GFC_MAX_DIMENSIONS - 1];
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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_INTEGER_4 *src;
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GFC_INTEGER_4 *dest;
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GFC_INTEGER_4 *destptr;
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int n;
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int packed;
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if (source->dim[0].stride == 0)
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{
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source->dim[0].stride = 1;
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return source->data;
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}
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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 (n = 0; n < dim; n++)
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{
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count[n] = 0;
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stride[n] = source->dim[n].stride;
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extent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
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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->data;
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/* Allocate storage for the destination. */
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destptr = (GFC_INTEGER_4 *)internal_malloc_size (ssize * 4);
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dest = destptr;
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src = source->data;
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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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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 proabably 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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