147 lines
4.0 KiB
C
147 lines
4.0 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 (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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__pack (const gfc_array_char * ret, const gfc_array_char * array,
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const gfc_array_l4 * mask, const gfc_array_char * vector)
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{
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/* r.* indicates the return array. */
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index_type rstride0;
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char *rptr;
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/* s.* indicates the source array. */
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index_type sstride[GFC_MAX_DIMENSIONS];
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index_type sstride0;
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const char *sptr;
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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 nelem;
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size = GFC_DESCRIPTOR_SIZE (array);
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dim = GFC_DESCRIPTOR_RANK (array);
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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] = array->dim[n].ubound + 1 - array->dim[n].lbound;
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sstride[n] = array->dim[n].stride * size;
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mstride[n] = mask->dim[n].stride;
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}
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if (sstride[0] == 0)
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sstride[0] = size;
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if (mstride[0] == 0)
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mstride[0] = 1;
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rstride0 = ret->dim[0].stride * size;
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if (rstride0 == 0)
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rstride0 = size;
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sstride0 = sstride[0];
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mstride0 = mstride[0];
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rptr = ret->data;
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sptr = array->data;
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mptr = mask->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 (sptr)
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{
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/* Test this element. */
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if (*mptr)
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{
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/* Add it. */
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memcpy (rptr, sptr, size);
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rptr += rstride0;
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}
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/* Advance to the next element. */
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sptr += sstride0;
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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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sptr -= sstride[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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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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mptr += mstride[n];
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}
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}
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}
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/* Add any remaining elements from VECTOR. */
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if (vector)
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{
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n = vector->dim[0].ubound + 1 - vector->dim[0].lbound;
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nelem = ((rptr - ret->data) / rstride0);
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if (n > nelem)
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{
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sstride0 = vector->dim[0].stride * size;
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if (sstride0 == 0)
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sstride0 = size;
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sptr = vector->data + sstride0 * nelem;
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n -= nelem;
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while (n--)
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{
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memcpy (rptr, sptr, size);
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rptr += rstride0;
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sptr += sstride0;
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}
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}
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}
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}
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