119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
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/* Generic implementation of the RESHAPE intrinsic
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Copyright 2002 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 (libgfor).
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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 libgfor; 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 <string.h>
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#include "libgfortran.h"
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void
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__spread (const gfc_array_char * ret, const gfc_array_char * source,
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const index_type * along, const index_type * pncopies)
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{
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/* r.* indicates the return array. */
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index_type rstride[GFC_MAX_DIMENSIONS - 1];
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index_type rstride0;
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index_type rdelta;
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char *rptr;
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char *dest;
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/* s.* indicates the source array. */
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index_type sstride[GFC_MAX_DIMENSIONS - 1];
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index_type sstride0;
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const char *sptr;
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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 n;
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index_type dim;
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index_type size;
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index_type ncopies;
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size = GFC_DESCRIPTOR_SIZE (source);
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dim = 0;
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for (n = 0; n < GFC_DESCRIPTOR_RANK (ret); n++)
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{
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if (n == *along - 1)
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{
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rdelta = ret->dim[n].stride * size;
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}
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else
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{
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count[dim] = 0;
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extent[dim] = source->dim[dim].ubound + 1 - source->dim[dim].lbound;
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sstride[dim] = source->dim[dim].stride * size;
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rstride[dim] = ret->dim[n].stride * size;
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dim++;
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}
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}
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dim = GFC_DESCRIPTOR_RANK (source);
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if (sstride[0] == 0)
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sstride[0] = size;
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if (rstride[0] == 0)
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rstride[0] = size;
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sstride0 = sstride[0];
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rstride0 = rstride[0];
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rptr = ret->data;
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sptr = source->data;
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ncopies = *pncopies;
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while (sptr)
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{
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/* Spread this element. */
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dest = rptr;
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for (n = 0; n < ncopies; n++)
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{
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memcpy (dest, sptr, size);
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dest += rdelta;
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}
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/* Advance to the next element. */
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sptr += sstride0;
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rptr += rstride0;
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count[0]++;
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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 probably not worth it. */
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sptr -= sstride[n] * extent[n];
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rptr -= rstride[n] * extent[n];
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n++;
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if (n >= dim)
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{
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/* Break out of the loop. */
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sptr = 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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sptr += sstride[n];
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rptr += rstride[n];
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}
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}
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}
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}
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