/* Special implementation of the SPREAD intrinsic
Copyright (C) 2008-2020 Free Software Foundation, Inc.
Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>, based on
spread_generic.c written by Paul Brook <paul@nowt.org>
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_2)
void
spread_i2 (gfc_array_i2 *ret, const gfc_array_i2 *source,
const index_type along, const index_type pncopies)
{
/* r.* indicates the return array. */
index_type rstride[GFC_MAX_DIMENSIONS];
index_type rstride0;
index_type rdelta = 0;
index_type rrank;
index_type rs;
GFC_INTEGER_2 *rptr;
GFC_INTEGER_2 * restrict dest;
/* s.* indicates the source array. */
index_type sstride[GFC_MAX_DIMENSIONS];
index_type sstride0;
index_type srank;
const GFC_INTEGER_2 *sptr;
index_type count[GFC_MAX_DIMENSIONS];
index_type extent[GFC_MAX_DIMENSIONS];
index_type n;
index_type dim;
index_type ncopies;
srank = GFC_DESCRIPTOR_RANK(source);
rrank = srank + 1;
if (rrank > GFC_MAX_DIMENSIONS)
runtime_error ("return rank too large in spread()");
if (along > rrank)
runtime_error ("dim outside of rank in spread()");
ncopies = pncopies;
if (ret->base_addr == NULL)
{
size_t ub, stride;
/* The front end has signalled that we need to populate the
return array descriptor. */
ret->dtype.rank = rrank;
dim = 0;
rs = 1;
for (n = 0; n < rrank; n++)
{
stride = rs;
if (n == along - 1)
{
ub = ncopies - 1;
rdelta = rs;
rs *= ncopies;
}
else
{
count[dim] = 0;
extent[dim] = GFC_DESCRIPTOR_EXTENT(source,dim);
sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
rstride[dim] = rs;
ub = extent[dim] - 1;
rs *= extent[dim];
dim++;
}
GFC_DIMENSION_SET(ret->dim[n], 0, ub, stride);
}
ret->offset = 0;
/* xmallocarray allocates a single byte for zero size. */
ret->base_addr = xmallocarray (rs, sizeof(GFC_INTEGER_2));
if (rs <= 0)
return;
}
else
{
int zero_sized;
zero_sized = 0;
dim = 0;
if (GFC_DESCRIPTOR_RANK(ret) != rrank)
runtime_error ("rank mismatch in spread()");
if (unlikely (compile_options.bounds_check))
{
for (n = 0; n < rrank; n++)
{
index_type ret_extent;
ret_extent = GFC_DESCRIPTOR_EXTENT(ret,n);
if (n == along - 1)
{
rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);
if (ret_extent != ncopies)
runtime_error("Incorrect extent in return value of SPREAD"
" intrinsic in dimension %ld: is %ld,"
" should be %ld", (long int) n+1,
(long int) ret_extent, (long int) ncopies);
}
else
{
count[dim] = 0;
extent[dim] = GFC_DESCRIPTOR_EXTENT(source,dim);
if (ret_extent != extent[dim])
runtime_error("Incorrect extent in return value of SPREAD"
" intrinsic in dimension %ld: is %ld,"
" should be %ld", (long int) n+1,
(long int) ret_extent,
(long int) extent[dim]);
if (extent[dim] <= 0)
zero_sized = 1;
sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);
dim++;
}
}
}
else
{
for (n = 0; n < rrank; n++)
{
if (n == along - 1)
{
rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);
}
else
{
count[dim] = 0;
extent[dim] = GFC_DESCRIPTOR_EXTENT(source,dim);
if (extent[dim] <= 0)
zero_sized = 1;
sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);
dim++;
}
}
}
if (zero_sized)
return;
if (sstride[0] == 0)
sstride[0] = 1;
}
sstride0 = sstride[0];
rstride0 = rstride[0];
rptr = ret->base_addr;
sptr = source->base_addr;
while (sptr)
{
/* Spread this element. */
dest = rptr;
for (n = 0; n < ncopies; n++)
{
*dest = *sptr;
dest += rdelta;
}
/* Advance to the next element. */
sptr += sstride0;
rptr += rstride0;
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. */
sptr -= sstride[n] * extent[n];
rptr -= rstride[n] * extent[n];
n++;
if (n >= srank)
{
/* Break out of the loop. */
sptr = NULL;
break;
}
else
{
count[n]++;
sptr += sstride[n];
rptr += rstride[n];
}
}
}
}
/* This version of spread_internal treats the special case of a scalar
source. This is much simpler than the more general case above. */
void
spread_scalar_i2 (gfc_array_i2 *ret, const GFC_INTEGER_2 *source,
const index_type along, const index_type ncopies)
{
GFC_INTEGER_2 * restrict dest;
index_type stride;
if (GFC_DESCRIPTOR_RANK (ret) != 1)
runtime_error ("incorrect destination rank in spread()");
if (along > 1)
runtime_error ("dim outside of rank in spread()");
if (ret->base_addr == NULL)
{
ret->base_addr = xmallocarray (ncopies, sizeof (GFC_INTEGER_2));
ret->offset = 0;
GFC_DIMENSION_SET(ret->dim[0], 0, ncopies - 1, 1);
}
else
{
if (ncopies - 1 > (GFC_DESCRIPTOR_EXTENT(ret,0) - 1)
/ GFC_DESCRIPTOR_STRIDE(ret,0))
runtime_error ("dim too large in spread()");
}
dest = ret->base_addr;
stride = GFC_DESCRIPTOR_STRIDE(ret,0);
for (index_type n = 0; n < ncopies; n++)
{
*dest = *source;
dest += stride;
}
}
#endif