233 lines
6.7 KiB
Plaintext
233 lines
6.7 KiB
Plaintext
`/* Implementation of the RESHAPE
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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 "libgfortran.h"'
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include(types.m4)dnl
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define(rtype_kind, regexp(file, `_.\([0-9]+\)\.', `\1'))dnl
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define(rtype_letter, regexp(file, `_\(.\)[0-9]+\.', `\1'))dnl
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define(rtype_code,rtype_letter`'rtype_name)dnl
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define(rtype,get_arraytype(rtype_letter,rtype_kind))dnl
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define(rtype_name, get_typename(rtype_letter, rtype_kind))dnl
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typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
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/* The shape parameter is ignored. We can currently deduce the shape from the
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return array. */
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dnl Only the kind (ie size) is used to name the function.
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void
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`__reshape_'rtype_kind (rtype * ret, rtype * source, shape_type * shape,
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rtype * pad, shape_type * order)
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{
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/* r.* indicates the return array. */
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index_type rcount[GFC_MAX_DIMENSIONS - 1];
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index_type rextent[GFC_MAX_DIMENSIONS - 1];
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index_type rstride[GFC_MAX_DIMENSIONS - 1];
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index_type rstride0;
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index_type rdim;
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index_type rsize;
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rtype_name *rptr;
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/* s.* indicates the source array. */
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index_type scount[GFC_MAX_DIMENSIONS - 1];
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index_type sextent[GFC_MAX_DIMENSIONS - 1];
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index_type sstride[GFC_MAX_DIMENSIONS - 1];
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index_type sstride0;
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index_type sdim;
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index_type ssize;
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const rtype_name *sptr;
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/* p.* indicates the pad array. */
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index_type pcount[GFC_MAX_DIMENSIONS - 1];
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index_type pextent[GFC_MAX_DIMENSIONS - 1];
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index_type pstride[GFC_MAX_DIMENSIONS - 1];
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index_type pdim;
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index_type psize;
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const rtype_name *pptr;
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const rtype_name *src;
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int n;
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int dim;
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if (ret->dim[0].stride == 0)
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ret->dim[0].stride = 1;
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if (source->dim[0].stride == 0)
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source->dim[0].stride = 1;
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if (shape->dim[0].stride == 0)
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shape->dim[0].stride = 1;
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if (pad && pad->dim[0].stride == 0)
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pad->dim[0].stride = 1;
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if (order && order->dim[0].stride == 0)
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order->dim[0].stride = 1;
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rdim = GFC_DESCRIPTOR_RANK (ret);
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rsize = 1;
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for (n = 0; n < rdim; n++)
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{
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if (order)
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dim = order->data[n * order->dim[0].stride] - 1;
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else
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dim = n;
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rcount[n] = 0;
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rstride[n] = ret->dim[dim].stride;
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rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
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if (rextent[n] != shape->data[dim * shape->dim[0].stride])
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runtime_error ("shape and target do not conform");
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if (rsize == rstride[n])
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rsize *= rextent[n];
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else
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rsize = 0;
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if (rextent[dim] <= 0)
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return;
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}
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sdim = GFC_DESCRIPTOR_RANK (source);
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ssize = 1;
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for (n = 0; n < sdim; n++)
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{
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scount[n] = 0;
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sstride[n] = source->dim[n].stride;
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sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
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if (sextent[n] <= 0)
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abort ();
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if (ssize == sstride[n])
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ssize *= sextent[n];
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else
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ssize = 0;
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}
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if (pad)
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{
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if (pad->dim[0].stride == 0)
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pad->dim[0].stride = 1;
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pdim = GFC_DESCRIPTOR_RANK (pad);
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psize = 1;
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for (n = 0; n < pdim; n++)
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{
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pcount[n] = 0;
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pstride[n] = pad->dim[n].stride;
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pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
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if (pextent[n] <= 0)
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abort ();
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if (psize == pstride[n])
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psize *= pextent[n];
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else
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psize = 0;
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}
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pptr = pad->data;
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}
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else
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{
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pdim = 0;
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psize = 1;
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pptr = NULL;
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}
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if (rsize != 0 && ssize != 0 && psize != 0)
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{
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rsize *= rtype_kind;
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ssize *= rtype_kind;
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psize *= rtype_kind;
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reshape_packed ((char *)ret->data, rsize, (char *)source->data,
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ssize, pad ? (char *)pad->data : NULL, psize);
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return;
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}
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rptr = ret->data;
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src = sptr = source->data;
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rstride0 = rstride[0];
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sstride0 = sstride[0];
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while (rptr)
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{
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/* Select between the source and pad arrays. */
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*rptr = *src;
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/* Advance to the next element. */
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rptr += rstride0;
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src += sstride0;
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rcount[0]++;
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scount[0]++;
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/* Advance to the next destination element. */
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n = 0;
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while (rcount[n] == rextent[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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rcount[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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rptr -= rstride[n] * rextent[n];
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n++;
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if (n == rdim)
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{
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/* Break out of the loop. */
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rptr = NULL;
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break;
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}
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else
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{
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rcount[n]++;
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rptr += rstride[n];
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}
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}
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/* Advance to the next source element. */
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n = 0;
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while (scount[n] == sextent[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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scount[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 -= sstride[n] * sextent[n];
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n++;
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if (n == sdim)
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{
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if (sptr && pad)
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{
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/* Switch to the pad array. */
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sptr = NULL;
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sdim = pdim;
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for (dim = 0; dim < pdim; dim++)
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{
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scount[dim] = pcount[dim];
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sextent[dim] = pextent[dim];
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sstride[dim] = pstride[dim];
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sstride0 = sstride[0];
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}
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}
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/* We now start again from the beginning of the pad array. */
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src = pptr;
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break;
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}
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else
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{
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scount[n]++;
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src += sstride[n];
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}
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}
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}
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}
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