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- /* Implementation of the CSHIFT intrinsic.
- Copyright (C) 2017-2022 Free Software Foundation, Inc.
- Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>
- This file is part of the GNU Fortran 95 runtime library (libgfortran).
- Libgfortran is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public
- License as published by the Free Software Foundation; either
- version 3 of the License, or (at your option) any later version.
- Libgfortran is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- Under Section 7 of GPL version 3, you are granted additional
- permissions described in the GCC Runtime Library Exception, version
- 3.1, as published by the Free Software Foundation.
- You should have received a copy of the GNU General Public License and
- a copy of the GCC Runtime Library Exception along with this program;
- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- <http://www.gnu.org/licenses/>. */
- #include "libgfortran.h"
- #include <string.h>
- #if defined (HAVE_GFC_REAL_10) && defined (HAVE_GFC_INTEGER_4)
- void
- cshift1_4_r10 (gfc_array_r10 * const restrict ret,
- const gfc_array_r10 * const restrict array,
- const gfc_array_i4 * const restrict h,
- const GFC_INTEGER_4 * const restrict pwhich)
- {
- /* r.* indicates the return array. */
- index_type rstride[GFC_MAX_DIMENSIONS];
- index_type rstride0;
- index_type roffset;
- GFC_REAL_10 *rptr;
- GFC_REAL_10 *dest;
- /* s.* indicates the source array. */
- index_type sstride[GFC_MAX_DIMENSIONS];
- index_type sstride0;
- index_type soffset;
- const GFC_REAL_10 *sptr;
- const GFC_REAL_10 *src;
- /* h.* indicates the shift array. */
- index_type hstride[GFC_MAX_DIMENSIONS];
- index_type hstride0;
- const GFC_INTEGER_4 *hptr;
- index_type count[GFC_MAX_DIMENSIONS];
- index_type extent[GFC_MAX_DIMENSIONS];
- index_type rs_ex[GFC_MAX_DIMENSIONS];
- index_type ss_ex[GFC_MAX_DIMENSIONS];
- index_type hs_ex[GFC_MAX_DIMENSIONS];
- index_type dim;
- index_type len;
- index_type n;
- int which;
- GFC_INTEGER_4 sh;
- /* Bounds checking etc is already done by the caller. */
- if (pwhich)
- which = *pwhich - 1;
- else
- which = 0;
- extent[0] = 1;
- count[0] = 0;
- n = 0;
- /* Initialized for avoiding compiler warnings. */
- roffset = 1;
- soffset = 1;
- len = 0;
- for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
- {
- if (dim == which)
- {
- roffset = GFC_DESCRIPTOR_STRIDE(ret,dim);
- if (roffset == 0)
- roffset = 1;
- soffset = GFC_DESCRIPTOR_STRIDE(array,dim);
- if (soffset == 0)
- soffset = 1;
- len = GFC_DESCRIPTOR_EXTENT(array,dim);
- }
- else
- {
- count[n] = 0;
- extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
- rstride[n] = GFC_DESCRIPTOR_STRIDE(ret,dim);
- sstride[n] = GFC_DESCRIPTOR_STRIDE(array,dim);
- hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
- rs_ex[n] = rstride[n] * extent[n];
- ss_ex[n] = sstride[n] * extent[n];
- hs_ex[n] = hstride[n] * extent[n];
- n++;
- }
- }
- if (sstride[0] == 0)
- sstride[0] = 1;
- if (rstride[0] == 0)
- rstride[0] = 1;
- if (hstride[0] == 0)
- hstride[0] = 1;
- dim = GFC_DESCRIPTOR_RANK (array);
- rstride0 = rstride[0];
- sstride0 = sstride[0];
- hstride0 = hstride[0];
- rptr = ret->base_addr;
- sptr = array->base_addr;
- hptr = h->base_addr;
- while (rptr)
- {
- /* Do the shift for this dimension. */
- sh = *hptr;
- /* Normal case should be -len < sh < len; try to
- avoid the expensive remainder operation if possible. */
- if (sh < 0)
- sh += len;
- if (unlikely(sh >= len || sh < 0))
- {
- sh = sh % len;
- if (sh < 0)
- sh += len;
- }
- src = &sptr[sh * soffset];
- dest = rptr;
- if (soffset == 1 && roffset == 1)
- {
- size_t len1 = sh * sizeof (GFC_REAL_10);
- size_t len2 = (len - sh) * sizeof (GFC_REAL_10);
- memcpy (rptr, sptr + sh, len2);
- memcpy (rptr + (len - sh), sptr, len1);
- }
- else
- {
- for (n = 0; n < len - sh; n++)
- {
- *dest = *src;
- dest += roffset;
- src += soffset;
- }
- for (src = sptr, n = 0; n < sh; n++)
- {
- *dest = *src;
- dest += roffset;
- src += soffset;
- }
- }
- /* Advance to the next section. */
- rptr += rstride0;
- sptr += sstride0;
- hptr += hstride0;
- count[0]++;
- n = 0;
- while (count[n] == extent[n])
- {
- /* When we get to the end of a dimension, reset it and increment
- the next dimension. */
- count[n] = 0;
- rptr -= rs_ex[n];
- sptr -= ss_ex[n];
- hptr -= hs_ex[n];
- n++;
- if (n >= dim - 1)
- {
- /* Break out of the loop. */
- rptr = NULL;
- break;
- }
- else
- {
- count[n]++;
- rptr += rstride[n];
- sptr += sstride[n];
- hptr += hstride[n];
- }
- }
- }
- }
- #endif
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