255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
/* Generic implementation of the CSHIFT intrinsic
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Copyright 2003 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 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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/* "Templatized" helper function for the inner shift loop. */
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#define DEF_COPY_LOOP(NAME, TYPE) \
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static inline void \
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copy_loop_##NAME (void *xdest, const void *xsrc, \
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size_t roff, size_t soff, \
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index_type len, index_type shift) \
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{ \
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TYPE *dest = xdest; \
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const TYPE *src; \
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index_type i; \
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\
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roff /= sizeof (TYPE); \
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soff /= sizeof (TYPE); \
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\
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src = xsrc; \
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src += shift * soff; \
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for (i = 0; i < len - shift; ++i) \
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{ \
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*dest = *src; \
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dest += roff; \
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src += soff; \
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} \
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\
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src = xsrc; \
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for (i = 0; i < shift; ++i) \
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{ \
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*dest = *src; \
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dest += roff; \
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src += soff; \
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} \
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}
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DEF_COPY_LOOP(int, int)
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DEF_COPY_LOOP(long, long)
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DEF_COPY_LOOP(double, double)
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DEF_COPY_LOOP(ldouble, long double)
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static void
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__cshift0 (gfc_array_char * ret, const gfc_array_char * array,
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ssize_t shift, 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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/* 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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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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if (which < 1 || which > GFC_DESCRIPTOR_RANK (array))
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runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
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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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/* 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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if (ret->data == NULL)
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{
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int i;
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ret->data = internal_malloc_size (size * size0 ((array_t *)array));
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ret->base = 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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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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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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dim = GFC_DESCRIPTOR_RANK (array);
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rstride0 = rstride[0];
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sstride0 = sstride[0];
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rptr = ret->data;
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sptr = array->data;
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shift = shift % (ssize_t)len;
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if (shift < 0)
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shift += len;
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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 elements are contiguous, perform the operation
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in two block moves. */
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if (soffset == size && roffset == size)
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{
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size_t len1 = shift * size;
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size_t len2 = (len - shift) * size;
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memcpy (rptr, sptr + len1, len2);
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memcpy (rptr + len2, sptr, len1);
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}
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else
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{
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/* Otherwise, we'll have to perform the copy one element at
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a time. We can speed this up a tad for common cases of
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fundamental types. */
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if (size == sizeof(int))
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copy_loop_int (rptr, sptr, roffset, soffset, len, shift);
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else if (size == sizeof(long))
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copy_loop_long (rptr, sptr, roffset, soffset, len, shift);
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else if (size == sizeof(double))
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copy_loop_double (rptr, sptr, roffset, soffset, len, shift);
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else if (size == sizeof(long double))
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copy_loop_ldouble (rptr, sptr, roffset, soffset, len, shift);
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else
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{
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char *dest = rptr;
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const char *src = &sptr[shift * soffset];
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for (n = 0; n < len - shift; 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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for (src = sptr, n = 0; n < shift; 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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}
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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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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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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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}
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}
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}
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}
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void
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__cshift0_4 (gfc_array_char * ret, const gfc_array_char * array,
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const GFC_INTEGER_4 * pshift, const GFC_INTEGER_4 * pdim)
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{
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__cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
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}
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void
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__cshift0_8 (gfc_array_char * ret, const gfc_array_char * array,
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const GFC_INTEGER_8 * pshift, const GFC_INTEGER_8 * pdim)
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{
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__cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
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}
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