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/* Generic implementation of the EOSHIFT intrinsic
Copyright 2002, 2005, 2007, 2009 Free Software Foundation, Inc.
Contributed by Paul Brook <paul@nowt.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 <stdlib.h>
#include <assert.h>
#include <string.h>
/* TODO: make this work for large shifts when
sizeof(int) < sizeof (index_type). */
static void
eoshift0 (gfc_array_char * ret, const gfc_array_char * array,
int shift, const char * pbound, int which, index_type size,
const char *filler, index_type filler_len)
{
/* r.* indicates the return array. */
index_type rstride[GFC_MAX_DIMENSIONS];
index_type rstride0;
index_type roffset;
char * restrict rptr;
char *dest;
/* s.* indicates the source array. */
index_type sstride[GFC_MAX_DIMENSIONS];
index_type sstride0;
index_type soffset;
const char *sptr;
const char *src;
index_type count[GFC_MAX_DIMENSIONS];
index_type extent[GFC_MAX_DIMENSIONS];
index_type dim;
index_type len;
index_type n;
index_type arraysize;
/* The compiler cannot figure out that these are set, initialize
them to avoid warnings. */
len = 0;
soffset = 0;
roffset = 0;
arraysize = size0 ((array_t *) array);
if (ret->data == NULL)
{
int i;
ret->offset = 0;
ret->dtype = array->dtype;
for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
{
index_type ub, str;
ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
if (i == 0)
str = 1;
else
str = GFC_DESCRIPTOR_EXTENT(ret,i-1)
* GFC_DESCRIPTOR_STRIDE(ret,i-1);
GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
}
/* internal_malloc_size allocates a single byte for zero size. */
ret->data = internal_malloc_size (size * arraysize);
}
else if (unlikely (compile_options.bounds_check))
{
bounds_equal_extents ((array_t *) ret, (array_t *) array,
"return value", "EOSHIFT");
}
if (arraysize == 0)
return;
which = which - 1;
extent[0] = 1;
count[0] = 0;
sstride[0] = -1;
rstride[0] = -1;
n = 0;
for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
{
if (dim == which)
{
roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
if (roffset == 0)
roffset = size;
soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
if (soffset == 0)
soffset = size;
len = GFC_DESCRIPTOR_EXTENT(array,dim);
}
else
{
count[n] = 0;
extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
n++;
}
}
if (sstride[0] == 0)
sstride[0] = size;
if (rstride[0] == 0)
rstride[0] = size;
dim = GFC_DESCRIPTOR_RANK (array);
rstride0 = rstride[0];
sstride0 = sstride[0];
rptr = ret->data;
sptr = array->data;
if ((shift >= 0 ? shift : -shift) > len)
{
shift = len;
len = 0;
}
else
{
if (shift > 0)
len = len - shift;
else
len = len + shift;
}
while (rptr)
{
/* Do the shift for this dimension. */
if (shift > 0)
{
src = &sptr[shift * soffset];
dest = rptr;
}
else
{
src = sptr;
dest = &rptr[-shift * roffset];
}
for (n = 0; n < len; n++)
{
memcpy (dest, src, size);
dest += roffset;
src += soffset;
}
if (shift >= 0)
{
n = shift;
}
else
{
dest = rptr;
n = -shift;
}
if (pbound)
while (n--)
{
memcpy (dest, pbound, size);
dest += roffset;
}
else
while (n--)
{
index_type i;
if (filler_len == 1)
memset (dest, filler[0], size);
else
for (i = 0; i < size ; i += filler_len)
memcpy (&dest[i], filler, filler_len);
dest += roffset;
}
/* Advance to the next section. */
rptr += rstride0;
sptr += sstride0;
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;
/* We could precalculate these products, but this is a less
frequently used path so probably not worth it. */
rptr -= rstride[n] * extent[n];
sptr -= sstride[n] * extent[n];
n++;
if (n >= dim - 1)
{
/* Break out of the loop. */
rptr = NULL;
break;
}
else
{
count[n]++;
rptr += rstride[n];
sptr += sstride[n];
}
}
}
}
#define DEFINE_EOSHIFT(N) \
extern void eoshift0_##N (gfc_array_char *, const gfc_array_char *, \
const GFC_INTEGER_##N *, const char *, \
const GFC_INTEGER_##N *); \
export_proto(eoshift0_##N); \
\
void \
eoshift0_##N (gfc_array_char *ret, const gfc_array_char *array, \
const GFC_INTEGER_##N *pshift, const char *pbound, \
const GFC_INTEGER_##N *pdim) \
{ \
eoshift0 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
GFC_DESCRIPTOR_SIZE (array), "\0", 1); \
} \
\
extern void eoshift0_##N##_char (gfc_array_char *, GFC_INTEGER_4, \
const gfc_array_char *, \
const GFC_INTEGER_##N *, const char *, \
const GFC_INTEGER_##N *, GFC_INTEGER_4, \
GFC_INTEGER_4); \
export_proto(eoshift0_##N##_char); \
\
void \
eoshift0_##N##_char (gfc_array_char *ret, \
GFC_INTEGER_4 ret_length __attribute__((unused)), \
const gfc_array_char *array, \
const GFC_INTEGER_##N *pshift, \
const char *pbound, \
const GFC_INTEGER_##N *pdim, \
GFC_INTEGER_4 array_length, \
GFC_INTEGER_4 bound_length __attribute__((unused))) \
{ \
eoshift0 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
array_length, " ", 1); \
} \
\
extern void eoshift0_##N##_char4 (gfc_array_char *, GFC_INTEGER_4, \
const gfc_array_char *, \
const GFC_INTEGER_##N *, const char *, \
const GFC_INTEGER_##N *, GFC_INTEGER_4, \
GFC_INTEGER_4); \
export_proto(eoshift0_##N##_char4); \
\
void \
eoshift0_##N##_char4 (gfc_array_char *ret, \
GFC_INTEGER_4 ret_length __attribute__((unused)), \
const gfc_array_char *array, \
const GFC_INTEGER_##N *pshift, \
const char *pbound, \
const GFC_INTEGER_##N *pdim, \
GFC_INTEGER_4 array_length, \
GFC_INTEGER_4 bound_length __attribute__((unused))) \
{ \
static const gfc_char4_t space = (unsigned char) ' '; \
eoshift0 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
array_length * sizeof (gfc_char4_t), (const char *) &space, \
sizeof (gfc_char4_t)); \
}
DEFINE_EOSHIFT (1);
DEFINE_EOSHIFT (2);
DEFINE_EOSHIFT (4);
DEFINE_EOSHIFT (8);
#ifdef HAVE_GFC_INTEGER_16
DEFINE_EOSHIFT (16);
#endif
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