278 lines
7.0 KiB
C
278 lines
7.0 KiB
C
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/* Special implementation of the SPREAD intrinsic
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Copyright 2008 Free Software Foundation, Inc.
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Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>, based on
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spread_generic.c written by Paul Brook <paul@nowt.org>
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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 General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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Ligbfortran 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 General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with libgfortran; see the file COPYING. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "libgfortran.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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#if defined (HAVE_GFC_REAL_8)
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void
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spread_r8 (gfc_array_r8 *ret, const gfc_array_r8 *source,
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const index_type along, const index_type pncopies)
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{
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/* r.* indicates the return array. */
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index_type rstride[GFC_MAX_DIMENSIONS];
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index_type rstride0;
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index_type rdelta = 0;
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index_type rrank;
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index_type rs;
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GFC_REAL_8 *rptr;
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GFC_REAL_8 *dest;
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/* s.* indicates the source array. */
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index_type sstride[GFC_MAX_DIMENSIONS];
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index_type sstride0;
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index_type srank;
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const GFC_REAL_8 *sptr;
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index_type count[GFC_MAX_DIMENSIONS];
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index_type extent[GFC_MAX_DIMENSIONS];
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index_type n;
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index_type dim;
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index_type ncopies;
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srank = GFC_DESCRIPTOR_RANK(source);
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rrank = srank + 1;
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if (rrank > GFC_MAX_DIMENSIONS)
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runtime_error ("return rank too large in spread()");
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if (along > rrank)
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runtime_error ("dim outside of rank in spread()");
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ncopies = pncopies;
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if (ret->data == NULL)
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{
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/* The front end has signalled that we need to populate the
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return array descriptor. */
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ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rrank;
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dim = 0;
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rs = 1;
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for (n = 0; n < rrank; n++)
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{
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ret->dim[n].stride = rs;
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ret->dim[n].lbound = 0;
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if (n == along - 1)
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{
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ret->dim[n].ubound = ncopies - 1;
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rdelta = rs;
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rs *= ncopies;
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}
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else
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{
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count[dim] = 0;
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extent[dim] = source->dim[dim].ubound + 1
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- source->dim[dim].lbound;
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sstride[dim] = source->dim[dim].stride;
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rstride[dim] = rs;
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ret->dim[n].ubound = extent[dim]-1;
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rs *= extent[dim];
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dim++;
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}
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}
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ret->offset = 0;
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if (rs > 0)
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ret->data = internal_malloc_size (rs * sizeof(GFC_REAL_8));
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else
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{
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ret->data = internal_malloc_size (1);
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return;
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}
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}
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else
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{
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int zero_sized;
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zero_sized = 0;
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dim = 0;
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if (GFC_DESCRIPTOR_RANK(ret) != rrank)
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runtime_error ("rank mismatch in spread()");
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if (compile_options.bounds_check)
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{
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for (n = 0; n < rrank; n++)
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{
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index_type ret_extent;
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ret_extent = ret->dim[n].ubound + 1 - ret->dim[n].lbound;
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if (n == along - 1)
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{
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rdelta = ret->dim[n].stride;
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if (ret_extent != ncopies)
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runtime_error("Incorrect extent in return value of SPREAD"
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" intrinsic in dimension %ld: is %ld,"
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" should be %ld", (long int) n+1,
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(long int) ret_extent, (long int) ncopies);
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}
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else
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{
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count[dim] = 0;
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extent[dim] = source->dim[dim].ubound + 1
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- source->dim[dim].lbound;
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if (ret_extent != extent[dim])
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runtime_error("Incorrect extent in return value of SPREAD"
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" intrinsic in dimension %ld: is %ld,"
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" should be %ld", (long int) n+1,
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(long int) ret_extent,
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(long int) extent[dim]);
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if (extent[dim] <= 0)
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zero_sized = 1;
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sstride[dim] = source->dim[dim].stride;
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rstride[dim] = ret->dim[n].stride;
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dim++;
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}
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}
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}
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else
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{
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for (n = 0; n < rrank; n++)
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{
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if (n == along - 1)
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{
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rdelta = ret->dim[n].stride;
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}
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else
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{
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count[dim] = 0;
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extent[dim] = source->dim[dim].ubound + 1
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- source->dim[dim].lbound;
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if (extent[dim] <= 0)
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zero_sized = 1;
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sstride[dim] = source->dim[dim].stride;
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rstride[dim] = ret->dim[n].stride;
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dim++;
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}
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}
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}
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if (zero_sized)
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return;
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if (sstride[0] == 0)
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sstride[0] = 1;
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}
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sstride0 = sstride[0];
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rstride0 = rstride[0];
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rptr = ret->data;
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sptr = source->data;
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while (sptr)
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{
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/* Spread this element. */
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dest = rptr;
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for (n = 0; n < ncopies; n++)
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{
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*dest = *sptr;
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dest += rdelta;
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}
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/* Advance to the next element. */
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sptr += sstride0;
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rptr += rstride0;
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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 probably not worth it. */
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sptr -= sstride[n] * extent[n];
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rptr -= rstride[n] * extent[n];
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n++;
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if (n >= srank)
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{
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/* Break out of the loop. */
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sptr = 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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sptr += sstride[n];
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rptr += rstride[n];
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}
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}
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}
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}
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/* This version of spread_internal treats the special case of a scalar
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source. This is much simpler than the more general case above. */
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void
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spread_scalar_r8 (gfc_array_r8 *ret, const GFC_REAL_8 *source,
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const index_type along, const index_type pncopies)
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{
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int n;
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int ncopies = pncopies;
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GFC_REAL_8 * dest;
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index_type stride;
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if (GFC_DESCRIPTOR_RANK (ret) != 1)
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runtime_error ("incorrect destination rank in spread()");
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if (along > 1)
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runtime_error ("dim outside of rank in spread()");
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if (ret->data == NULL)
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{
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ret->data = internal_malloc_size (ncopies * sizeof (GFC_REAL_8));
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ret->offset = 0;
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ret->dim[0].stride = 1;
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ret->dim[0].lbound = 0;
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ret->dim[0].ubound = ncopies - 1;
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}
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else
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{
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if (ncopies - 1 > (ret->dim[0].ubound - ret->dim[0].lbound)
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/ ret->dim[0].stride)
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runtime_error ("dim too large in spread()");
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}
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dest = ret->data;
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stride = ret->dim[0].stride;
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for (n = 0; n < ncopies; n++)
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{
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*dest = *source;
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dest += stride;
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}
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}
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#endif
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