| /* Special implementation of the SPREAD intrinsic |
| Copyright 2008, 2009 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 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. |
| |
| 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 <stdlib.h> |
| #include <assert.h> |
| #include <string.h> |
| |
| |
| #if defined (HAVE_GFC_REAL_4) |
| |
| void |
| spread_r4 (gfc_array_r4 *ret, const gfc_array_r4 *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_REAL_4 *rptr; |
| GFC_REAL_4 * restrict dest; |
| /* s.* indicates the source array. */ |
| index_type sstride[GFC_MAX_DIMENSIONS]; |
| index_type sstride0; |
| index_type srank; |
| const GFC_REAL_4 *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->data == NULL) |
| { |
| /* The front end has signalled that we need to populate the |
| return array descriptor. */ |
| ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rrank; |
| dim = 0; |
| rs = 1; |
| for (n = 0; n < rrank; n++) |
| { |
| ret->dim[n].stride = rs; |
| ret->dim[n].lbound = 0; |
| if (n == along - 1) |
| { |
| ret->dim[n].ubound = ncopies - 1; |
| rdelta = rs; |
| rs *= ncopies; |
| } |
| else |
| { |
| count[dim] = 0; |
| extent[dim] = source->dim[dim].ubound + 1 |
| - source->dim[dim].lbound; |
| sstride[dim] = source->dim[dim].stride; |
| rstride[dim] = rs; |
| |
| ret->dim[n].ubound = extent[dim]-1; |
| rs *= extent[dim]; |
| dim++; |
| } |
| } |
| ret->offset = 0; |
| if (rs > 0) |
| ret->data = internal_malloc_size (rs * sizeof(GFC_REAL_4)); |
| else |
| { |
| ret->data = internal_malloc_size (1); |
| 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 = ret->dim[n].ubound + 1 - ret->dim[n].lbound; |
| if (n == along - 1) |
| { |
| rdelta = ret->dim[n].stride; |
| |
| 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] = source->dim[dim].ubound + 1 |
| - source->dim[dim].lbound; |
| 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] = source->dim[dim].stride; |
| rstride[dim] = ret->dim[n].stride; |
| dim++; |
| } |
| } |
| } |
| else |
| { |
| for (n = 0; n < rrank; n++) |
| { |
| if (n == along - 1) |
| { |
| rdelta = ret->dim[n].stride; |
| } |
| else |
| { |
| count[dim] = 0; |
| extent[dim] = source->dim[dim].ubound + 1 |
| - source->dim[dim].lbound; |
| if (extent[dim] <= 0) |
| zero_sized = 1; |
| sstride[dim] = source->dim[dim].stride; |
| rstride[dim] = ret->dim[n].stride; |
| dim++; |
| } |
| } |
| } |
| |
| if (zero_sized) |
| return; |
| |
| if (sstride[0] == 0) |
| sstride[0] = 1; |
| } |
| sstride0 = sstride[0]; |
| rstride0 = rstride[0]; |
| rptr = ret->data; |
| sptr = source->data; |
| |
| 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_r4 (gfc_array_r4 *ret, const GFC_REAL_4 *source, |
| const index_type along, const index_type pncopies) |
| { |
| int n; |
| int ncopies = pncopies; |
| GFC_REAL_4 * 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->data == NULL) |
| { |
| ret->data = internal_malloc_size (ncopies * sizeof (GFC_REAL_4)); |
| ret->offset = 0; |
| ret->dim[0].stride = 1; |
| ret->dim[0].lbound = 0; |
| ret->dim[0].ubound = ncopies - 1; |
| } |
| else |
| { |
| if (ncopies - 1 > (ret->dim[0].ubound - ret->dim[0].lbound) |
| / ret->dim[0].stride) |
| runtime_error ("dim too large in spread()"); |
| } |
| |
| dest = ret->data; |
| stride = ret->dim[0].stride; |
| |
| for (n = 0; n < ncopies; n++) |
| { |
| *dest = *source; |
| dest += stride; |
| } |
| } |
| |
| #endif |
| |