libgfortran/generated/spread_r8.c

   1 /* Special implementation of the SPREAD intrinsic
   2    Copyright (C) 2008-2018 Free Software Foundation, Inc.
   3    Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>, based on
   4    spread_generic.c written by Paul Brook <paul@nowt.org>
   5
   6 This file is part of the GNU Fortran runtime library (libgfortran).
   7
   8 Libgfortran is free software; you can redistribute it and/or
   9 modify it under the terms of the GNU General Public
  10 License as published by the Free Software Foundation; either
  11 version 3 of the License, or (at your option) any later version.
  12
  13 Ligbfortran is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #include "libgfortran.h"
  28 #include <string.h>
  29
  30
  31 #if defined (HAVE_GFC_REAL_8)
  32
  33 void
  34 spread_r8 (gfc_array_r8 *ret, const gfc_array_r8 *source,
  35                  const index_type along, const index_type pncopies)
  36 {
  37   /* r.* indicates the return array.  */
  38   index_type rstride[GFC_MAX_DIMENSIONS];
  39   index_type rstride0;
  40   index_type rdelta = 0;
  41   index_type rrank;
  42   index_type rs;
  43   GFC_REAL_8 *rptr;
  44   GFC_REAL_8 * restrict dest;
  45   /* s.* indicates the source array.  */
  46   index_type sstride[GFC_MAX_DIMENSIONS];
  47   index_type sstride0;
  48   index_type srank;
  49   const GFC_REAL_8 *sptr;
  50
  51   index_type count[GFC_MAX_DIMENSIONS];
  52   index_type extent[GFC_MAX_DIMENSIONS];
  53   index_type n;
  54   index_type dim;
  55   index_type ncopies;
  56
  57   srank = GFC_DESCRIPTOR_RANK(source);
  58
  59   rrank = srank + 1;
  60   if (rrank > GFC_MAX_DIMENSIONS)
  61     runtime_error ("return rank too large in spread()");
  62
  63   if (along > rrank)
  64       runtime_error ("dim outside of rank in spread()");
  65
  66   ncopies = pncopies;
  67
  68   if (ret->base_addr == NULL)
  69     {
  70
  71       size_t ub, stride;
  72
  73       /* The front end has signalled that we need to populate the
  74          return array descriptor.  */
  75       GFC_DTYPE_COPY_SETRANK(ret,source,rrank);
  76       dim = 0;
  77       rs = 1;
  78       for (n = 0; n < rrank; n++)
  79         {
  80           stride = rs;
  81           if (n == along - 1)
  82             {
  83               ub = ncopies - 1;
  84               rdelta = rs;
  85               rs *= ncopies;
  86             }
  87           else
  88             {
  89               count[dim] = 0;
  90               extent[dim] = GFC_DESCRIPTOR_EXTENT(source,dim);
  91               sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
  92               rstride[dim] = rs;
  93
  94               ub = extent[dim] - 1;
  95               rs *= extent[dim];
  96               dim++;
  97             }
  98           GFC_DIMENSION_SET(ret->dim[n], 0, ub, stride);
  99         }
 100       ret->offset = 0;
 101
 102       /* xmallocarray allocates a single byte for zero size.  */
 103       ret->base_addr = xmallocarray (rs, sizeof(GFC_REAL_8));
 104       if (rs <= 0)
 105         return;
 106     }
 107   else
 108     {
 109       int zero_sized;
 110
 111       zero_sized = 0;
 112
 113       dim = 0;
 114       if (GFC_DESCRIPTOR_RANK(ret) != rrank)
 115         runtime_error ("rank mismatch in spread()");
 116
 117       if (unlikely (compile_options.bounds_check))
 118         {
 119           for (n = 0; n < rrank; n++)
 120             {
 121               index_type ret_extent;
 122
 123               ret_extent = GFC_DESCRIPTOR_EXTENT(ret,n);
 124               if (n == along - 1)
 125                 {
 126                   rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);
 127
 128                   if (ret_extent != ncopies)
 129                     runtime_error("Incorrect extent in return value of SPREAD"
 130                                   " intrinsic in dimension %ld: is %ld,"
 131                                   " should be %ld", (long int) n+1,
 132                                   (long int) ret_extent, (long int) ncopies);
 133                 }
 134               else
 135                 {
 136                   count[dim] = 0;
 137                   extent[dim] = GFC_DESCRIPTOR_EXTENT(source,dim);
 138                   if (ret_extent != extent[dim])
 139                     runtime_error("Incorrect extent in return value of SPREAD"
 140                                   " intrinsic in dimension %ld: is %ld,"
 141                                   " should be %ld", (long int) n+1,
 142                                   (long int) ret_extent,
 143                                   (long int) extent[dim]);
 144
 145                   if (extent[dim] <= 0)
 146                     zero_sized = 1;
 147                   sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
 148                   rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);
 149                   dim++;
 150                 }
 151             }
 152         }
 153       else
 154         {
 155           for (n = 0; n < rrank; n++)
 156             {
 157               if (n == along - 1)
 158                 {
 159                   rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);
 160                 }
 161               else
 162                 {
 163                   count[dim] = 0;
 164                   extent[dim] = GFC_DESCRIPTOR_EXTENT(source,dim);
 165                   if (extent[dim] <= 0)
 166                     zero_sized = 1;
 167                   sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);
 168                   rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);
 169                   dim++;
 170                 }
 171             }
 172         }
 173
 174       if (zero_sized)
 175         return;
 176
 177       if (sstride[0] == 0)
 178         sstride[0] = 1;
 179     }
 180   sstride0 = sstride[0];
 181   rstride0 = rstride[0];
 182   rptr = ret->base_addr;
 183   sptr = source->base_addr;
 184
 185   while (sptr)
 186     {
 187       /* Spread this element.  */
 188       dest = rptr;
 189       for (n = 0; n < ncopies; n++)
 190         {
 191           *dest = *sptr;
 192           dest += rdelta;
 193         }
 194       /* Advance to the next element.  */
 195       sptr += sstride0;
 196       rptr += rstride0;
 197       count[0]++;
 198       n = 0;
 199       while (count[n] == extent[n])
 200         {
 201           /* When we get to the end of a dimension, reset it and increment
 202              the next dimension.  */
 203           count[n] = 0;
 204           /* We could precalculate these products, but this is a less
 205              frequently used path so probably not worth it.  */
 206           sptr -= sstride[n] * extent[n];
 207           rptr -= rstride[n] * extent[n];
 208           n++;
 209           if (n >= srank)
 210             {
 211               /* Break out of the loop.  */
 212               sptr = NULL;
 213               break;
 214             }
 215           else
 216             {
 217               count[n]++;
 218               sptr += sstride[n];
 219               rptr += rstride[n];
 220             }
 221         }
 222     }
 223 }
 224
 225 /* This version of spread_internal treats the special case of a scalar
 226    source.  This is much simpler than the more general case above.  */
 227
 228 void
 229 spread_scalar_r8 (gfc_array_r8 *ret, const GFC_REAL_8 *source,
 230                         const index_type along, const index_type pncopies)
 231 {
 232   int n;
 233   int ncopies = pncopies;
 234   GFC_REAL_8 * restrict dest;
 235   index_type stride;
 236
 237   if (GFC_DESCRIPTOR_RANK (ret) != 1)
 238     runtime_error ("incorrect destination rank in spread()");
 239
 240   if (along > 1)
 241     runtime_error ("dim outside of rank in spread()");
 242
 243   if (ret->base_addr == NULL)
 244     {
 245       ret->base_addr = xmallocarray (ncopies, sizeof (GFC_REAL_8));
 246       ret->offset = 0;
 247       GFC_DIMENSION_SET(ret->dim[0], 0, ncopies - 1, 1);
 248     }
 249   else
 250     {
 251       if (ncopies - 1 > (GFC_DESCRIPTOR_EXTENT(ret,0) - 1)
 252                            / GFC_DESCRIPTOR_STRIDE(ret,0))
 253         runtime_error ("dim too large in spread()");
 254     }
 255
 256   dest = ret->base_addr;
 257   stride = GFC_DESCRIPTOR_STRIDE(ret,0);
 258
 259   for (n = 0; n < ncopies; n++)
 260     {
 261       *dest = *source;
 262       dest += stride;
 263     }
 264 }
 265
 266 #endif
 267