libgfortran/generated/eoshift1_4.c

   1 /* Implementation of the EOSHIFT intrinsic
   2    Copyright (C) 2002-2017 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "libgfortran.h"
  27 #include <string.h>
  28
  29
  30 #if defined (HAVE_GFC_INTEGER_4)
  31
  32 static void
  33 eoshift1 (gfc_array_char * const restrict ret,
  34         const gfc_array_char * const restrict array,
  35         const gfc_array_i4 * const restrict h,
  36         const char * const restrict pbound,
  37         const GFC_INTEGER_4 * const restrict pwhich,
  38         const char * filler, index_type filler_len)
  39 {
  40   /* r.* indicates the return array.  */
  41   index_type rstride[GFC_MAX_DIMENSIONS];
  42   index_type rstride0;
  43   index_type roffset;
  44   char *rptr;
  45   char * restrict dest;
  46   /* s.* indicates the source array.  */
  47   index_type sstride[GFC_MAX_DIMENSIONS];
  48   index_type sstride0;
  49   index_type soffset;
  50   const char *sptr;
  51   const char *src;
  52   /* h.* indicates the shift array.  */
  53   index_type hstride[GFC_MAX_DIMENSIONS];
  54   index_type hstride0;
  55   const GFC_INTEGER_4 *hptr;
  56
  57   index_type count[GFC_MAX_DIMENSIONS];
  58   index_type extent[GFC_MAX_DIMENSIONS];
  59   index_type dim;
  60   index_type len;
  61   index_type n;
  62   index_type size;
  63   index_type arraysize;
  64   int which;
  65   GFC_INTEGER_4 sh;
  66   GFC_INTEGER_4 delta;
  67
  68   /* The compiler cannot figure out that these are set, initialize
  69      them to avoid warnings.  */
  70   len = 0;
  71   soffset = 0;
  72   roffset = 0;
  73
  74   size = GFC_DESCRIPTOR_SIZE(array);
  75
  76   if (pwhich)
  77     which = *pwhich - 1;
  78   else
  79     which = 0;
  80
  81   extent[0] = 1;
  82   count[0] = 0;
  83
  84   arraysize = size0 ((array_t *) array);
  85   if (ret->base_addr == NULL)
  86     {
  87       int i;
  88
  89       ret->offset = 0;
  90       ret->dtype = array->dtype;
  91       for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  92         {
  93           index_type ub, str;
  94
  95           ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
  96
  97           if (i == 0)
  98             str = 1;
  99           else
 100             str = GFC_DESCRIPTOR_EXTENT(ret,i-1)
 101               * GFC_DESCRIPTOR_STRIDE(ret,i-1);
 102
 103           GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
 104
 105         }
 106       /* xmallocarray allocates a single byte for zero size.  */
 107       ret->base_addr = xmallocarray (arraysize, size);
 108
 109     }
 110   else if (unlikely (compile_options.bounds_check))
 111     {
 112       bounds_equal_extents ((array_t *) ret, (array_t *) array,
 113                                  "return value", "EOSHIFT");
 114     }
 115
 116   if (unlikely (compile_options.bounds_check))
 117     {
 118       bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
 119                               "SHIFT argument", "EOSHIFT");
 120     }
 121
 122   if (arraysize == 0)
 123     return;
 124
 125   n = 0;
 126   for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
 127     {
 128       if (dim == which)
 129         {
 130           roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
 131           if (roffset == 0)
 132             roffset = size;
 133           soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
 134           if (soffset == 0)
 135             soffset = size;
 136           len = GFC_DESCRIPTOR_EXTENT(array,dim);
 137         }
 138       else
 139         {
 140           count[n] = 0;
 141           extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
 142           rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
 143           sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
 144
 145           hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
 146           n++;
 147         }
 148     }
 149   if (sstride[0] == 0)
 150     sstride[0] = size;
 151   if (rstride[0] == 0)
 152     rstride[0] = size;
 153   if (hstride[0] == 0)
 154     hstride[0] = 1;
 155
 156   dim = GFC_DESCRIPTOR_RANK (array);
 157   rstride0 = rstride[0];
 158   sstride0 = sstride[0];
 159   hstride0 = hstride[0];
 160   rptr = ret->base_addr;
 161   sptr = array->base_addr;
 162   hptr = h->base_addr;
 163
 164   while (rptr)
 165     {
 166       /* Do the shift for this dimension.  */
 167       sh = *hptr;
 168       if (( sh >= 0 ? sh : -sh ) > len)
 169         {
 170           delta = len;
 171           sh = len;
 172         }
 173       else
 174         delta = (sh >= 0) ? sh: -sh;
 175
 176       if (sh > 0)
 177         {
 178           src = &sptr[delta * soffset];
 179           dest = rptr;
 180         }
 181       else
 182         {
 183           src = sptr;
 184           dest = &rptr[delta * roffset];
 185         }
 186
 187       /* If the elements are contiguous, perform a single block move.  */
 188       if (soffset == size && roffset == size)
 189         {
 190           size_t chunk = size * (len - delta);
 191           memcpy (dest, src, chunk);
 192           dest += chunk;
 193         }
 194       else
 195         {
 196           for (n = 0; n < len - delta; n++)
 197             {
 198               memcpy (dest, src, size);
 199               dest += roffset;
 200               src += soffset;
 201             }
 202         }
 203       if (sh < 0)
 204         dest = rptr;
 205       n = delta;
 206
 207       if (pbound)
 208         while (n--)
 209           {
 210             memcpy (dest, pbound, size);
 211             dest += roffset;
 212           }
 213       else
 214         while (n--)
 215           {
 216             index_type i;
 217
 218             if (filler_len == 1)
 219               memset (dest, filler[0], size);
 220             else
 221               for (i = 0; i < size; i += filler_len)
 222                 memcpy (&dest[i], filler, filler_len);
 223
 224             dest += roffset;
 225           }
 226
 227       /* Advance to the next section.  */
 228       rptr += rstride0;
 229       sptr += sstride0;
 230       hptr += hstride0;
 231       count[0]++;
 232       n = 0;
 233       while (count[n] == extent[n])
 234         {
 235           /* When we get to the end of a dimension, reset it and increment
 236              the next dimension.  */
 237           count[n] = 0;
 238           /* We could precalculate these products, but this is a less
 239              frequently used path so probably not worth it.  */
 240           rptr -= rstride[n] * extent[n];
 241           sptr -= sstride[n] * extent[n];
 242           hptr -= hstride[n] * extent[n];
 243           n++;
 244           if (n >= dim - 1)
 245             {
 246               /* Break out of the loop.  */
 247               rptr = NULL;
 248               break;
 249             }
 250           else
 251             {
 252               count[n]++;
 253               rptr += rstride[n];
 254               sptr += sstride[n];
 255               hptr += hstride[n];
 256             }
 257         }
 258     }
 259 }
 260
 261 void eoshift1_4 (gfc_array_char * const restrict,
 262         const gfc_array_char * const restrict,
 263         const gfc_array_i4 * const restrict, const char * const restrict,
 264         const GFC_INTEGER_4 * const restrict);
 265 export_proto(eoshift1_4);
 266
 267 void
 268 eoshift1_4 (gfc_array_char * const restrict ret,
 269         const gfc_array_char * const restrict array,
 270         const gfc_array_i4 * const restrict h,
 271         const char * const restrict pbound,
 272         const GFC_INTEGER_4 * const restrict pwhich)
 273 {
 274   eoshift1 (ret, array, h, pbound, pwhich, "\0", 1);
 275 }
 276
 277
 278 void eoshift1_4_char (gfc_array_char * const restrict,
 279         GFC_INTEGER_4,
 280         const gfc_array_char * const restrict,
 281         const gfc_array_i4 * const restrict,
 282         const char * const restrict,
 283         const GFC_INTEGER_4 * const restrict,
 284         GFC_INTEGER_4, GFC_INTEGER_4);
 285 export_proto(eoshift1_4_char);
 286
 287 void
 288 eoshift1_4_char (gfc_array_char * const restrict ret,
 289         GFC_INTEGER_4 ret_length __attribute__((unused)),
 290         const gfc_array_char * const restrict array,
 291         const gfc_array_i4 * const restrict h,
 292         const char *  const restrict pbound,
 293         const GFC_INTEGER_4 * const restrict pwhich,
 294         GFC_INTEGER_4 array_length __attribute__((unused)),
 295         GFC_INTEGER_4 bound_length __attribute__((unused)))
 296 {
 297   eoshift1 (ret, array, h, pbound, pwhich, " ", 1);
 298 }
 299
 300
 301 void eoshift1_4_char4 (gfc_array_char * const restrict,
 302         GFC_INTEGER_4,
 303         const gfc_array_char * const restrict,
 304         const gfc_array_i4 * const restrict,
 305         const char * const restrict,
 306         const GFC_INTEGER_4 * const restrict,
 307         GFC_INTEGER_4, GFC_INTEGER_4);
 308 export_proto(eoshift1_4_char4);
 309
 310 void
 311 eoshift1_4_char4 (gfc_array_char * const restrict ret,
 312         GFC_INTEGER_4 ret_length __attribute__((unused)),
 313         const gfc_array_char * const restrict array,
 314         const gfc_array_i4 * const restrict h,
 315         const char *  const restrict pbound,
 316         const GFC_INTEGER_4 * const restrict pwhich,
 317         GFC_INTEGER_4 array_length __attribute__((unused)),
 318         GFC_INTEGER_4 bound_length __attribute__((unused)))
 319 {
 320   static const gfc_char4_t space = (unsigned char) ' ';
 321   eoshift1 (ret, array, h, pbound, pwhich,
 322             (const char *) &space, sizeof (gfc_char4_t));
 323 }
 324
 325 #endif