171 lines
5.0 KiB
C
171 lines
5.0 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., 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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extern void unpack1 (const gfc_array_char *, const gfc_array_char *,
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const gfc_array_l4 *, const gfc_array_char *);
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iexport_proto(unpack1);
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void
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unpack1 (const gfc_array_char *ret, const gfc_array_char *vector,
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const gfc_array_l4 *mask, const gfc_array_char *field)
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{
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/* r.* indicates the return array. */
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index_type rstride[GFC_MAX_DIMENSIONS];
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index_type rstride0;
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char *rptr;
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/* v.* indicates the vector array. */
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index_type vstride0;
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char *vptr;
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/* f.* indicates the field array. */
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index_type fstride[GFC_MAX_DIMENSIONS];
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index_type fstride0;
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const char *fptr;
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/* m.* indicates the mask array. */
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index_type mstride[GFC_MAX_DIMENSIONS];
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index_type mstride0;
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const GFC_LOGICAL_4 *mptr;
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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 n;
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index_type dim;
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index_type size;
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index_type fsize;
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size = GFC_DESCRIPTOR_SIZE (ret);
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/* A field element size of 0 actually means this is a scalar. */
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fsize = GFC_DESCRIPTOR_SIZE (field);
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dim = GFC_DESCRIPTOR_RANK (ret);
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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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extent[n] = ret->dim[n].ubound + 1 - ret->dim[n].lbound;
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rstride[n] = ret->dim[n].stride * size;
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fstride[n] = field->dim[n].stride * fsize;
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mstride[n] = mask->dim[n].stride;
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}
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if (rstride[0] == 0)
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rstride[0] = size;
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if (fstride[0] == 0)
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fstride[0] = fsize;
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if (mstride[0] == 0)
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mstride[0] = 1;
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vstride0 = vector->dim[0].stride * size;
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if (vstride0 == 0)
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vstride0 = size;
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rstride0 = rstride[0];
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fstride0 = fstride[0];
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mstride0 = mstride[0];
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rptr = ret->data;
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fptr = field->data;
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mptr = mask->data;
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vptr = vector->data;
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/* Use the same loop for both logical types. */
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if (GFC_DESCRIPTOR_SIZE (mask) != 4)
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{
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if (GFC_DESCRIPTOR_SIZE (mask) != 8)
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runtime_error ("Funny sized logical array");
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for (n = 0; n < dim; n++)
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mstride[n] <<= 1;
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mstride0 <<= 1;
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mptr = GFOR_POINTER_L8_TO_L4 (mptr);
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}
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while (rptr)
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{
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if (*mptr)
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{
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/* From vector. */
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memcpy (rptr, vptr, size);
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vptr += vstride0;
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}
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else
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{
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/* From field. */
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memcpy (rptr, fptr, size);
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}
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/* Advance to the next element. */
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rptr += rstride0;
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fptr += fstride0;
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mptr += mstride0;
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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 proabably not worth it. */
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rptr -= rstride[n] * extent[n];
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fptr -= fstride[n] * extent[n];
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mptr -= mstride[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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rptr = 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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rptr += rstride[n];
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fptr += fstride[n];
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mptr += mstride[n];
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}
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}
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}
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}
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iexport(unpack1);
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extern void unpack0 (const gfc_array_char *, const gfc_array_char *,
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const gfc_array_l4 *, char *);
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export_proto(unpack0);
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void
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unpack0 (const gfc_array_char *ret, const gfc_array_char *vector,
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const gfc_array_l4 *mask, char *field)
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{
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gfc_array_char tmp;
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tmp.dtype = 0;
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tmp.data = field;
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unpack1 (ret, vector, mask, &tmp);
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}
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