/* Generic implementation of the CSHIFT intrinsic
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright 2003, 2005 Free Software Foundation, Inc.
Contributed by Feng Wang <wf_cs@yahoo.com>
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 Lesser General Public
+modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
+version 2 of the License, or (at your option) any later version.
-Ligbfor is distributed in the hope that it will be useful,
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file. (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+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 Lesser General Public License for more details.
+GNU General Public License for more details.
-You should have received a copy of the GNU Lesser General Public
-License along with libgfor; see the file COPYING.LIB. If not,
-write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+You should have received a copy of the GNU General Public
+License along with libgfortran; see the file COPYING. If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "libgfortran.h"
-/* TODO: make this work for large shifts when
- sizeof(int) < sizeof (index_type). */
+
+/* "Templatized" helper function for the inner shift loop. */
+
+#define DEF_COPY_LOOP(NAME, TYPE) \
+static inline void \
+copy_loop_##NAME (void *xdest, const void *xsrc, \
+ size_t roff, size_t soff, \
+ index_type len, index_type shift) \
+{ \
+ TYPE *dest = xdest; \
+ const TYPE *src; \
+ index_type i; \
+ \
+ roff /= sizeof (TYPE); \
+ soff /= sizeof (TYPE); \
+ \
+ src = xsrc; \
+ src += shift * soff; \
+ for (i = 0; i < len - shift; ++i) \
+ { \
+ *dest = *src; \
+ dest += roff; \
+ src += soff; \
+ } \
+ \
+ src = xsrc; \
+ for (i = 0; i < shift; ++i) \
+ { \
+ *dest = *src; \
+ dest += roff; \
+ src += soff; \
+ } \
+}
+
+DEF_COPY_LOOP(int, int)
+DEF_COPY_LOOP(long, long)
+DEF_COPY_LOOP(double, double)
+DEF_COPY_LOOP(ldouble, long double)
+DEF_COPY_LOOP(cfloat, _Complex float)
+DEF_COPY_LOOP(cdouble, _Complex double)
+
static void
-__cshift0 (const gfc_array_char * ret, const gfc_array_char * array,
- int shift, int which)
+cshift0 (gfc_array_char * ret, const gfc_array_char * array,
+ ssize_t shift, int which, index_type size)
{
/* r.* indicates the return array. */
- index_type rstride[GFC_MAX_DIMENSIONS - 1];
+ index_type rstride[GFC_MAX_DIMENSIONS];
index_type rstride0;
index_type roffset;
char *rptr;
- char *dest;
+
/* s.* indicates the source array. */
- index_type sstride[GFC_MAX_DIMENSIONS - 1];
+ index_type sstride[GFC_MAX_DIMENSIONS];
index_type sstride0;
index_type soffset;
const char *sptr;
- const char *src;
- index_type count[GFC_MAX_DIMENSIONS - 1];
- index_type extent[GFC_MAX_DIMENSIONS - 1];
+ index_type count[GFC_MAX_DIMENSIONS];
+ index_type extent[GFC_MAX_DIMENSIONS];
index_type dim;
- index_type size;
index_type len;
index_type n;
+ int whichloop;
if (which < 1 || which > GFC_DESCRIPTOR_RANK (array))
runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
- size = GFC_DESCRIPTOR_SIZE (ret);
-
which = which - 1;
extent[0] = 1;
count[0] = 0;
- size = GFC_DESCRIPTOR_SIZE (array);
n = 0;
-/* Initialized for avoiding compiler warnings. */
+ /* The values assigned here must match the cases in the inner loop. */
+ whichloop = 0;
+ switch (GFC_DESCRIPTOR_TYPE (array))
+ {
+ case GFC_DTYPE_LOGICAL:
+ case GFC_DTYPE_INTEGER:
+ case GFC_DTYPE_REAL:
+ if (size == sizeof (int))
+ whichloop = 1;
+ else if (size == sizeof (long))
+ whichloop = 2;
+ else if (size == sizeof (double))
+ whichloop = 3;
+ else if (size == sizeof (long double))
+ whichloop = 4;
+ break;
+
+ case GFC_DTYPE_COMPLEX:
+ if (size == sizeof (_Complex float))
+ whichloop = 5;
+ else if (size == sizeof (_Complex double))
+ whichloop = 6;
+ break;
+
+ default:
+ break;
+ }
+
+ /* Initialized for avoiding compiler warnings. */
roffset = size;
soffset = size;
len = 0;
+ if (ret->data == NULL)
+ {
+ int i;
+
+ ret->data = internal_malloc_size (size * size0 ((array_t *)array));
+ ret->offset = 0;
+ ret->dtype = array->dtype;
+ for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
+ {
+ ret->dim[i].lbound = 0;
+ ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
+
+ if (i == 0)
+ ret->dim[i].stride = 1;
+ else
+ ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
+ }
+ }
+
for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
{
if (dim == which)
rptr = ret->data;
sptr = array->data;
- shift = (div (shift, len)).rem;
+ shift = shift % (ssize_t)len;
if (shift < 0)
shift += len;
while (rptr)
{
/* Do the shift for this dimension. */
- src = &sptr[shift * soffset];
- dest = rptr;
- for (n = 0; n < len; n++)
- {
- memcpy (dest, src, size);
- dest += roffset;
- if (n == len - shift - 1)
- src = sptr;
- else
- src += soffset;
- }
+
+ /* If elements are contiguous, perform the operation
+ in two block moves. */
+ if (soffset == size && roffset == size)
+ {
+ size_t len1 = shift * size;
+ size_t len2 = (len - shift) * size;
+ memcpy (rptr, sptr + len1, len2);
+ memcpy (rptr + len2, sptr, len1);
+ }
+ else
+ {
+ /* Otherwise, we'll have to perform the copy one element at
+ a time. We can speed this up a tad for common cases of
+ fundamental types. */
+ switch (whichloop)
+ {
+ case 0:
+ {
+ char *dest = rptr;
+ const char *src = &sptr[shift * soffset];
+
+ for (n = 0; n < len - shift; n++)
+ {
+ memcpy (dest, src, size);
+ dest += roffset;
+ src += soffset;
+ }
+ for (src = sptr, n = 0; n < shift; n++)
+ {
+ memcpy (dest, src, size);
+ dest += roffset;
+ src += soffset;
+ }
+ }
+ break;
+
+ case 1:
+ copy_loop_int (rptr, sptr, roffset, soffset, len, shift);
+ break;
+
+ case 2:
+ copy_loop_long (rptr, sptr, roffset, soffset, len, shift);
+ break;
+
+ case 3:
+ copy_loop_double (rptr, sptr, roffset, soffset, len, shift);
+ break;
+
+ case 4:
+ copy_loop_ldouble (rptr, sptr, roffset, soffset, len, shift);
+ break;
+
+ case 5:
+ copy_loop_cfloat (rptr, sptr, roffset, soffset, len, shift);
+ break;
+
+ case 6:
+ copy_loop_cdouble (rptr, sptr, roffset, soffset, len, shift);
+ break;
+
+ default:
+ abort ();
+ }
+ }
/* Advance to the next section. */
rptr += rstride0;
}
}
+#define DEFINE_CSHIFT(N) \
+ extern void cshift0_##N (gfc_array_char *, const gfc_array_char *, \
+ const GFC_INTEGER_##N *, const GFC_INTEGER_##N *); \
+ export_proto(cshift0_##N); \
+ \
+ void \
+ cshift0_##N (gfc_array_char *ret, const gfc_array_char *array, \
+ const GFC_INTEGER_##N *pshift, const GFC_INTEGER_##N *pdim) \
+ { \
+ cshift0 (ret, array, *pshift, pdim ? *pdim : 1, \
+ GFC_DESCRIPTOR_SIZE (array)); \
+ } \
+ \
+ extern void cshift0_##N##_char (gfc_array_char *, GFC_INTEGER_4, \
+ const gfc_array_char *, \
+ const GFC_INTEGER_##N *, \
+ const GFC_INTEGER_##N *, GFC_INTEGER_4); \
+ export_proto(cshift0_##N##_char); \
+ \
+ void \
+ cshift0_##N##_char (gfc_array_char *ret, \
+ GFC_INTEGER_4 ret_length __attribute__((unused)), \
+ const gfc_array_char *array, \
+ const GFC_INTEGER_##N *pshift, \
+ const GFC_INTEGER_##N *pdim, \
+ GFC_INTEGER_4 array_length) \
+ { \
+ cshift0 (ret, array, *pshift, pdim ? *pdim : 1, array_length); \
+ }
-void
-__cshift0_4 (const gfc_array_char * ret, const gfc_array_char * array,
- const GFC_INTEGER_4 * pshift, const GFC_INTEGER_4 * pdim)
-{
- __cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
-}
-
-
-void
-__cshift0_8 (const gfc_array_char * ret, const gfc_array_char * array,
- const GFC_INTEGER_8 * pshift, const GFC_INTEGER_8 * pdim)
-{
- __cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
-}
-
+DEFINE_CSHIFT (1);
+DEFINE_CSHIFT (2);
+DEFINE_CSHIFT (4);
+DEFINE_CSHIFT (8);
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