205 lines
5.3 KiB
C
205 lines
5.3 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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static const char zeros[16] =
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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/* TODO: make this work for large shifts when
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sizeof(int) < sizeof (index_type). */
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static void
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__eoshift2 (const gfc_array_char * ret, const gfc_array_char * array,
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int shift, const gfc_array_char * bound, int which)
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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 roffset;
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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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index_type soffset;
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const char *sptr;
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const char *src;
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/* b.* indicates the bound array. */
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index_type bstride[GFC_MAX_DIMENSIONS - 1];
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index_type bstride0;
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const char *bptr;
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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 dim;
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index_type size;
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index_type len;
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index_type n;
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size = GFC_DESCRIPTOR_SIZE (ret);
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which = which - 1;
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extent[0] = 1;
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count[0] = 0;
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size = GFC_DESCRIPTOR_SIZE (array);
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n = 0;
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for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
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{
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if (dim == which)
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{
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roffset = ret->dim[dim].stride * size;
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if (roffset == 0)
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roffset = size;
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soffset = array->dim[dim].stride * size;
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if (soffset == 0)
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soffset = size;
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len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
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}
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else
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{
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count[n] = 0;
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extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
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rstride[n] = ret->dim[dim].stride * size;
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sstride[n] = array->dim[dim].stride * size;
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if (bound)
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bstride[n] = bound->dim[n].stride * size;
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else
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bstride[n] = 0;
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n++;
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}
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}
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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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if (bound && bstride[0] == 0)
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bstride[0] = size;
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dim = GFC_DESCRIPTOR_RANK (array);
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rstride0 = rstride[0];
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sstride0 = sstride[0];
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bstride0 = bstride[0];
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rptr = ret->data;
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sptr = array->data;
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if (bound)
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bptr = bound->data;
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else
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bptr = zeros;
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if (shift > 0)
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len = len - shift;
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else
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len = len + shift;
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while (rptr)
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{
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/* Do the shift for this dimension. */
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if (shift > 0)
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{
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src = &sptr[shift * soffset];
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dest = rptr;
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}
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else
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{
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src = sptr;
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dest = &rptr[-shift * roffset];
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}
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for (n = 0; n < len; n++)
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{
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memcpy (dest, src, size);
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dest += roffset;
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src += soffset;
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}
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if (shift >= 0)
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{
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n = shift;
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}
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else
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{
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dest = rptr;
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n = -shift;
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}
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while (n--)
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{
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memcpy (dest, bptr, size);
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dest += roffset;
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}
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/* Advance to the next section. */
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rptr += rstride0;
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sptr += sstride0;
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bptr += bstride0;
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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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sptr -= sstride[n] * extent[n];
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bptr -= bstride[n] * extent[n];
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n++;
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if (n >= dim - 1)
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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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sptr += sstride[n];
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bptr += bstride[n];
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}
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}
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}
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}
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void
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__eoshift2_4 (const gfc_array_char * ret, const gfc_array_char * array,
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const GFC_INTEGER_4 * pshift, const gfc_array_char * bound,
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const GFC_INTEGER_4 * pdim)
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{
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__eoshift2 (ret, array, *pshift, bound, pdim ? *pdim : 1);
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}
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void
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__eoshift2_8 (const gfc_array_char * ret, const gfc_array_char * array,
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const GFC_INTEGER_8 * pshift, const gfc_array_char * bound,
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const GFC_INTEGER_8 * pdim)
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{
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__eoshift2 (ret, array, *pshift, bound, pdim ? *pdim : 1);
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}
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