266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
/* Special implementation of the SPREAD intrinsic
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Copyright (C) 2008-2022 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 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 3 of the License, or (at your option) any later version.
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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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <string.h>
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#if defined (HAVE_GFC_INTEGER_8)
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void
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spread_i8 (gfc_array_i8 *ret, const gfc_array_i8 *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_INTEGER_8 *rptr;
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GFC_INTEGER_8 * restrict 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_INTEGER_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->base_addr == NULL)
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{
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size_t ub, stride;
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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.rank = 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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stride = rs;
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if (n == along - 1)
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{
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ub = 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] = GFC_DESCRIPTOR_EXTENT(source,dim);
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sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
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rstride[dim] = rs;
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ub = extent[dim] - 1;
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rs *= extent[dim];
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dim++;
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}
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GFC_DIMENSION_SET(ret->dim[n], 0, ub, stride);
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}
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ret->offset = 0;
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/* xmallocarray allocates a single byte for zero size. */
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ret->base_addr = xmallocarray (rs, sizeof(GFC_INTEGER_8));
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if (rs <= 0)
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return;
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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 (unlikely (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 = GFC_DESCRIPTOR_EXTENT(ret,n);
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if (n == along - 1)
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{
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rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);
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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] = GFC_DESCRIPTOR_EXTENT(source,dim);
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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] = GFC_DESCRIPTOR_STRIDE(source,dim);
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rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);
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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 = GFC_DESCRIPTOR_STRIDE(ret,n);
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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] = GFC_DESCRIPTOR_EXTENT(source,dim);
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if (extent[dim] <= 0)
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zero_sized = 1;
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sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
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rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);
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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->base_addr;
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sptr = source->base_addr;
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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_i8 (gfc_array_i8 *ret, const GFC_INTEGER_8 *source,
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const index_type along, const index_type ncopies)
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{
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GFC_INTEGER_8 * restrict 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->base_addr == NULL)
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{
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ret->base_addr = xmallocarray (ncopies, sizeof (GFC_INTEGER_8));
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ret->offset = 0;
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GFC_DIMENSION_SET(ret->dim[0], 0, ncopies - 1, 1);
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}
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else
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{
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if (ncopies - 1 > (GFC_DESCRIPTOR_EXTENT(ret,0) - 1)
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/ GFC_DESCRIPTOR_STRIDE(ret,0))
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runtime_error ("dim too large in spread()");
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}
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dest = ret->base_addr;
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stride = GFC_DESCRIPTOR_STRIDE(ret,0);
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for (index_type 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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