257 lines
6.9 KiB
C
257 lines
6.9 KiB
C
/* Implementation of the CSHIFT intrinsic
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Copyright 2003, 2007, 2009 Free Software Foundation, Inc.
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Contributed by Feng Wang <wf_cs@yahoo.com>
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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 3 of the License, or (at your option) any later version.
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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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.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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#if defined (HAVE_GFC_INTEGER_4)
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static void
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cshift1 (gfc_array_char * const restrict ret,
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const gfc_array_char * const restrict array,
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const gfc_array_i4 * const restrict h,
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const GFC_INTEGER_4 * const restrict pwhich,
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index_type size)
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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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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];
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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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/* h.* indicates the shift array. */
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index_type hstride[GFC_MAX_DIMENSIONS];
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index_type hstride0;
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const GFC_INTEGER_4 *hptr;
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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 dim;
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index_type len;
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index_type n;
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int which;
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GFC_INTEGER_4 sh;
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index_type arraysize;
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if (pwhich)
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which = *pwhich - 1;
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else
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which = 0;
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if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
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runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
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arraysize = size0 ((array_t *)array);
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if (ret->data == NULL)
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{
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int i;
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ret->data = internal_malloc_size (size * arraysize);
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ret->offset = 0;
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ret->dtype = array->dtype;
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for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
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{
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ret->dim[i].lbound = 0;
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ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
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if (i == 0)
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ret->dim[i].stride = 1;
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else
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ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
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}
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}
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if (arraysize == 0)
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return;
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extent[0] = 1;
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count[0] = 0;
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n = 0;
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/* Initialized for avoiding compiler warnings. */
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roffset = size;
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soffset = size;
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len = 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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hstride[n] = h->dim[n].stride;
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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 (hstride[0] == 0)
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hstride[0] = 1;
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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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hstride0 = hstride[0];
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rptr = ret->data;
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sptr = array->data;
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hptr = h->data;
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while (rptr)
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{
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/* Do the shift for this dimension. */
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sh = *hptr;
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sh = (div (sh, len)).rem;
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if (sh < 0)
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sh += len;
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src = &sptr[sh * soffset];
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dest = rptr;
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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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if (n == len - sh - 1)
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src = sptr;
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else
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src += soffset;
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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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hptr += hstride0;
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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 probably 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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hptr -= hstride[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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hptr += hstride[n];
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}
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}
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}
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}
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void cshift1_4 (gfc_array_char * const restrict,
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const gfc_array_char * const restrict,
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const gfc_array_i4 * const restrict,
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const GFC_INTEGER_4 * const restrict);
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export_proto(cshift1_4);
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void
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cshift1_4 (gfc_array_char * const restrict ret,
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const gfc_array_char * const restrict array,
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const gfc_array_i4 * const restrict h,
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const GFC_INTEGER_4 * const restrict pwhich)
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{
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cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
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}
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void cshift1_4_char (gfc_array_char * const restrict ret,
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GFC_INTEGER_4,
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const gfc_array_char * const restrict array,
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const gfc_array_i4 * const restrict h,
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const GFC_INTEGER_4 * const restrict pwhich,
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GFC_INTEGER_4);
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export_proto(cshift1_4_char);
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void
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cshift1_4_char (gfc_array_char * const restrict ret,
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GFC_INTEGER_4 ret_length __attribute__((unused)),
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const gfc_array_char * const restrict array,
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const gfc_array_i4 * const restrict h,
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const GFC_INTEGER_4 * const restrict pwhich,
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GFC_INTEGER_4 array_length)
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{
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cshift1 (ret, array, h, pwhich, array_length);
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}
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void cshift1_4_char4 (gfc_array_char * const restrict ret,
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GFC_INTEGER_4,
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const gfc_array_char * const restrict array,
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const gfc_array_i4 * const restrict h,
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const GFC_INTEGER_4 * const restrict pwhich,
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GFC_INTEGER_4);
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export_proto(cshift1_4_char4);
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void
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cshift1_4_char4 (gfc_array_char * const restrict ret,
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GFC_INTEGER_4 ret_length __attribute__((unused)),
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const gfc_array_char * const restrict array,
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const gfc_array_i4 * const restrict h,
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const GFC_INTEGER_4 * const restrict pwhich,
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GFC_INTEGER_4 array_length)
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{
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cshift1 (ret, array, h, pwhich, array_length * sizeof (gfc_char4_t));
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}
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#endif
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