282 lines
8.0 KiB
C
282 lines
8.0 KiB
C
/* 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 (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 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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Ligbfortran 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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You should have received a copy of the GNU General Public
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License along with libgfortran; see the file COPYING. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "libgfortran.h"
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typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
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typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) parray;
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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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static void
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reshape_internal (parray *ret, parray *source, shape_type *shape,
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parray *pad, shape_type *order, index_type size)
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{
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/* r.* indicates the return array. */
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index_type rcount[GFC_MAX_DIMENSIONS];
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index_type rextent[GFC_MAX_DIMENSIONS];
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index_type rstride[GFC_MAX_DIMENSIONS];
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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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index_type rs;
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index_type rex;
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char *rptr;
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/* s.* indicates the source array. */
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index_type scount[GFC_MAX_DIMENSIONS];
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index_type sextent[GFC_MAX_DIMENSIONS];
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index_type sstride[GFC_MAX_DIMENSIONS];
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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 char *sptr;
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/* p.* indicates the pad array. */
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index_type pcount[GFC_MAX_DIMENSIONS];
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index_type pextent[GFC_MAX_DIMENSIONS];
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index_type pstride[GFC_MAX_DIMENSIONS];
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index_type pdim;
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index_type psize;
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const char *pptr;
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const char *src;
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int n;
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int dim;
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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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if (ret->data == NULL)
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{
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rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
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rs = 1;
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for (n=0; n < rdim; n++)
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{
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ret->dim[n].lbound = 0;
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rex = shape->data[n * shape->dim[0].stride];
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ret->dim[n].ubound = rex - 1;
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ret->dim[n].stride = rs;
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rs *= rex;
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}
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ret->offset = 0;
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ret->data = internal_malloc_size ( rs * size );
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ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim;
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}
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else
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{
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rdim = GFC_DESCRIPTOR_RANK (ret);
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if (ret->dim[0].stride == 0)
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ret->dim[0].stride = 1;
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}
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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[n] <= 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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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 *= size;
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ssize *= size;
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psize *= size;
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reshape_packed (ret->data, rsize, source->data, ssize,
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pad ? 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] * size;
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sstride0 = sstride[0] * size;
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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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memcpy(rptr, src, size);
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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] * size;
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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] * size;
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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] * size;
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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] * size;
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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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sptr += sstride[n] * size;
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}
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}
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}
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}
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extern void reshape (parray *, parray *, shape_type *, parray *, shape_type *);
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export_proto(reshape);
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void
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reshape (parray *ret, parray *source, shape_type *shape, parray *pad,
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shape_type *order)
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{
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reshape_internal (ret, source, shape, pad, order,
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GFC_DESCRIPTOR_SIZE (source));
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}
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extern void reshape_char (parray *, GFC_INTEGER_4, parray *, shape_type *,
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parray *, shape_type *, GFC_INTEGER_4,
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GFC_INTEGER_4);
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export_proto(reshape_char);
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void
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reshape_char (parray *ret, GFC_INTEGER_4 ret_length __attribute__((unused)),
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parray *source, shape_type *shape, parray *pad,
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shape_type *order, GFC_INTEGER_4 source_length,
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GFC_INTEGER_4 pad_length __attribute__((unused)))
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{
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reshape_internal (ret, source, shape, pad, order, source_length);
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}
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