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/* Implementation of the CSHIFT intrinsic
Copyright (C) 2003-2018 Free Software Foundation, Inc.
Contributed by Feng Wang <wf_cs@yahoo.com>
This file is part of the GNU Fortran 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.
Ligbfortran 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_INTEGER_4)
static void
cshift1 (gfc_array_char * const restrict ret,
const gfc_array_char * 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;
char *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;
/* 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 dim;
index_type len;
index_type n;
int which;
GFC_INTEGER_4 sh;
index_type arraysize;
index_type size;
index_type type_size;
if (pwhich)
which = *pwhich - 1;
else
which = 0;
if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
size = GFC_DESCRIPTOR_SIZE(array);
arraysize = size0 ((array_t *)array);
if (ret->base_addr == NULL)
{
ret->base_addr = xmallocarray (arraysize, size);
ret->offset = 0;
GFC_DTYPE_COPY(ret,array);
for (index_type 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);
}
}
else if (unlikely (compile_options.bounds_check))
{
bounds_equal_extents ((array_t *) ret, (array_t *) array,
"return value", "CSHIFT");
}
if (unlikely (compile_options.bounds_check))
{
bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
"SHIFT argument", "CSHIFT");
}
if (arraysize == 0)
return;
/* See if we should dispatch to a helper function. */
type_size = GFC_DTYPE_TYPE_SIZE (array);
switch (type_size)
{
case GFC_DTYPE_LOGICAL_1:
case GFC_DTYPE_INTEGER_1:
cshift1_4_i1 ((gfc_array_i1 *)ret, (gfc_array_i1 *) array,
h, pwhich);
return;
case GFC_DTYPE_LOGICAL_2:
case GFC_DTYPE_INTEGER_2:
cshift1_4_i2 ((gfc_array_i2 *)ret, (gfc_array_i2 *) array,
h, pwhich);
return;
case GFC_DTYPE_LOGICAL_4:
case GFC_DTYPE_INTEGER_4:
cshift1_4_i4 ((gfc_array_i4 *)ret, (gfc_array_i4 *) array,
h, pwhich);
return;
case GFC_DTYPE_LOGICAL_8:
case GFC_DTYPE_INTEGER_8:
cshift1_4_i8 ((gfc_array_i8 *)ret, (gfc_array_i8 *) array,
h, pwhich);
return;
#if defined (HAVE_INTEGER_16)
case GFC_DTYPE_LOGICAL_16:
case GFC_DTYPE_INTEGER_16:
cshift1_4_i16 ((gfc_array_i16 *)ret, (gfc_array_i16 *) array,
h, pwhich);
return;
#endif
case GFC_DTYPE_REAL_4:
cshift1_4_r4 ((gfc_array_r4 *)ret, (gfc_array_r4 *) array,
h, pwhich);
return;
case GFC_DTYPE_REAL_8:
cshift1_4_r8 ((gfc_array_r8 *)ret, (gfc_array_r8 *) array,
h, pwhich);
return;
#if defined (HAVE_REAL_10)
case GFC_DTYPE_REAL_10:
cshift1_4_r10 ((gfc_array_r10 *)ret, (gfc_array_r10 *) array,
h, pwhich);
return;
#endif
#if defined (HAVE_REAL_16)
case GFC_DTYPE_REAL_16:
cshift1_4_r16 ((gfc_array_r16 *)ret, (gfc_array_r16 *) array,
h, pwhich);
return;
#endif
case GFC_DTYPE_COMPLEX_4:
cshift1_4_c4 ((gfc_array_c4 *)ret, (gfc_array_c4 *) array,
h, pwhich);
return;
case GFC_DTYPE_COMPLEX_8:
cshift1_4_c8 ((gfc_array_c8 *)ret, (gfc_array_c8 *) array,
h, pwhich);
return;
#if defined (HAVE_COMPLEX_10)
case GFC_DTYPE_COMPLEX_10:
cshift1_4_c10 ((gfc_array_c10 *)ret, (gfc_array_c10 *) array,
h, pwhich);
return;
#endif
#if defined (HAVE_COMPLEX_16)
case GFC_DTYPE_COMPLEX_16:
cshift1_4_c16 ((gfc_array_c16 *)ret, (gfc_array_c16 *) array,
h, pwhich);
return;
#endif
default:
break;
}
extent[0] = 1;
count[0] = 0;
n = 0;
/* Initialized for avoiding compiler warnings. */
roffset = size;
soffset = size;
len = 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);
hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
n++;
}
}
if (sstride[0] == 0)
sstride[0] = size;
if (rstride[0] == 0)
rstride[0] = size;
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 == size && roffset == size)
{
size_t len1 = sh * size;
size_t len2 = (len - sh) * size;
memcpy (rptr, sptr + len1, len2);
memcpy (rptr + len2, sptr, len1);
}
else
{
for (n = 0; n < len - sh; n++)
{
memcpy (dest, src, size);
dest += roffset;
src += soffset;
}
for (src = sptr, n = 0; n < sh; n++)
{
memcpy (dest, src, size);
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;
/* 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];
hptr -= hstride[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];
hptr += hstride[n];
}
}
}
}
void cshift1_4 (gfc_array_char * const restrict,
const gfc_array_char * const restrict,
const gfc_array_i4 * const restrict,
const GFC_INTEGER_4 * const restrict);
export_proto(cshift1_4);
void
cshift1_4 (gfc_array_char * const restrict ret,
const gfc_array_char * const restrict array,
const gfc_array_i4 * const restrict h,
const GFC_INTEGER_4 * const restrict pwhich)
{
cshift1 (ret, array, h, pwhich);
}
void cshift1_4_char (gfc_array_char * const restrict ret,
GFC_INTEGER_4,
const gfc_array_char * const restrict array,
const gfc_array_i4 * const restrict h,
const GFC_INTEGER_4 * const restrict pwhich,
GFC_INTEGER_4);
export_proto(cshift1_4_char);
void
cshift1_4_char (gfc_array_char * const restrict ret,
GFC_INTEGER_4 ret_length __attribute__((unused)),
const gfc_array_char * const restrict array,
const gfc_array_i4 * const restrict h,
const GFC_INTEGER_4 * const restrict pwhich,
GFC_INTEGER_4 array_length __attribute__((unused)))
{
cshift1 (ret, array, h, pwhich);
}
void cshift1_4_char4 (gfc_array_char * const restrict ret,
GFC_INTEGER_4,
const gfc_array_char * const restrict array,
const gfc_array_i4 * const restrict h,
const GFC_INTEGER_4 * const restrict pwhich,
GFC_INTEGER_4);
export_proto(cshift1_4_char4);
void
cshift1_4_char4 (gfc_array_char * const restrict ret,
GFC_INTEGER_4 ret_length __attribute__((unused)),
const gfc_array_char * const restrict array,
const gfc_array_i4 * const restrict h,
const GFC_INTEGER_4 * const restrict pwhich,
GFC_INTEGER_4 array_length __attribute__((unused)))
{
cshift1 (ret, array, h, pwhich);
}
#endif