libgfortran/generated/cshift1_4.c

   1 /* Implementation of the CSHIFT intrinsic
   2    Copyright (C) 2003-2018 Free Software Foundation, Inc.
   3    Contributed by Feng Wang <wf_cs@yahoo.com>
   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 Ligbfortran 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 cshift1 (gfc_array_char * const restrict ret,
  34         const gfc_array_char * const restrict array,
  35         const gfc_array_i4 * const restrict h,
  36         const GFC_INTEGER_4 * const restrict pwhich)
  37 {
  38   /* r.* indicates the return array.  */
  39   index_type rstride[GFC_MAX_DIMENSIONS];
  40   index_type rstride0;
  41   index_type roffset;
  42   char *rptr;
  43   char *dest;
  44   /* s.* indicates the source array.  */
  45   index_type sstride[GFC_MAX_DIMENSIONS];
  46   index_type sstride0;
  47   index_type soffset;
  48   const char *sptr;
  49   const char *src;
  50   /* h.* indicates the shift array.  */
  51   index_type hstride[GFC_MAX_DIMENSIONS];
  52   index_type hstride0;
  53   const GFC_INTEGER_4 *hptr;
  54
  55   index_type count[GFC_MAX_DIMENSIONS];
  56   index_type extent[GFC_MAX_DIMENSIONS];
  57   index_type dim;
  58   index_type len;
  59   index_type n;
  60   int which;
  61   GFC_INTEGER_4 sh;
  62   index_type arraysize;
  63   index_type size;
  64   index_type type_size;
  65
  66   if (pwhich)
  67     which = *pwhich - 1;
  68   else
  69     which = 0;
  70
  71   if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
  72     runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
  73
  74   size = GFC_DESCRIPTOR_SIZE(array);
  75
  76   arraysize = size0 ((array_t *)array);
  77
  78   if (ret->base_addr == NULL)
  79     {
  80       ret->base_addr = xmallocarray (arraysize, size);
  81       ret->offset = 0;
  82       GFC_DTYPE_COPY(ret,array);
  83       for (index_type i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  84         {
  85           index_type ub, str;
  86
  87           ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
  88
  89           if (i == 0)
  90             str = 1;
  91           else
  92             str = GFC_DESCRIPTOR_EXTENT(ret,i-1) *
  93               GFC_DESCRIPTOR_STRIDE(ret,i-1);
  94
  95           GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
  96         }
  97     }
  98   else if (unlikely (compile_options.bounds_check))
  99     {
 100       bounds_equal_extents ((array_t *) ret, (array_t *) array,
 101                                  "return value", "CSHIFT");
 102     }
 103
 104   if (unlikely (compile_options.bounds_check))
 105     {
 106       bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
 107                               "SHIFT argument", "CSHIFT");
 108     }
 109
 110   if (arraysize == 0)
 111     return;
 112
 113   /* See if we should dispatch to a helper function.  */
 114
 115   type_size = GFC_DTYPE_TYPE_SIZE (array);
 116
 117   switch (type_size)
 118   {
 119     case GFC_DTYPE_LOGICAL_1:
 120     case GFC_DTYPE_INTEGER_1:
 121       cshift1_4_i1 ((gfc_array_i1 *)ret, (gfc_array_i1 *) array,
 122                         h, pwhich);
 123       return;
 124
 125     case GFC_DTYPE_LOGICAL_2:
 126     case GFC_DTYPE_INTEGER_2:
 127       cshift1_4_i2 ((gfc_array_i2 *)ret, (gfc_array_i2 *) array,
 128                         h, pwhich);
 129       return;
 130
 131     case GFC_DTYPE_LOGICAL_4:
 132     case GFC_DTYPE_INTEGER_4:
 133       cshift1_4_i4 ((gfc_array_i4 *)ret, (gfc_array_i4 *) array,
 134                         h, pwhich);
 135       return;
 136
 137     case GFC_DTYPE_LOGICAL_8:
 138     case GFC_DTYPE_INTEGER_8:
 139       cshift1_4_i8 ((gfc_array_i8 *)ret, (gfc_array_i8 *) array,
 140                         h, pwhich);
 141       return;
 142
 143 #if defined (HAVE_INTEGER_16)
 144     case GFC_DTYPE_LOGICAL_16:
 145     case GFC_DTYPE_INTEGER_16:
 146       cshift1_4_i16 ((gfc_array_i16 *)ret, (gfc_array_i16 *) array,
 147                         h, pwhich);
 148       return;
 149 #endif
 150
 151     case GFC_DTYPE_REAL_4:
 152       cshift1_4_r4 ((gfc_array_r4 *)ret, (gfc_array_r4 *) array,
 153                         h, pwhich);
 154       return;
 155
 156     case GFC_DTYPE_REAL_8:
 157       cshift1_4_r8 ((gfc_array_r8 *)ret, (gfc_array_r8 *) array,
 158                         h, pwhich);
 159       return;
 160
 161 #if defined (HAVE_REAL_10)
 162     case GFC_DTYPE_REAL_10:
 163       cshift1_4_r10 ((gfc_array_r10 *)ret, (gfc_array_r10 *) array,
 164                         h, pwhich);
 165       return;
 166 #endif
 167
 168 #if defined (HAVE_REAL_16)
 169     case GFC_DTYPE_REAL_16:
 170       cshift1_4_r16 ((gfc_array_r16 *)ret, (gfc_array_r16 *) array,
 171                         h, pwhich);
 172       return;
 173 #endif
 174
 175     case GFC_DTYPE_COMPLEX_4:
 176       cshift1_4_c4 ((gfc_array_c4 *)ret, (gfc_array_c4 *) array,
 177                         h, pwhich);
 178       return;
 179
 180     case GFC_DTYPE_COMPLEX_8:
 181       cshift1_4_c8 ((gfc_array_c8 *)ret, (gfc_array_c8 *) array,
 182                         h, pwhich);
 183       return;
 184
 185 #if defined (HAVE_COMPLEX_10)
 186     case GFC_DTYPE_COMPLEX_10:
 187       cshift1_4_c10 ((gfc_array_c10 *)ret, (gfc_array_c10 *) array,
 188                         h, pwhich);
 189       return;
 190 #endif
 191
 192 #if defined (HAVE_COMPLEX_16)
 193     case GFC_DTYPE_COMPLEX_16:
 194       cshift1_4_c16 ((gfc_array_c16 *)ret, (gfc_array_c16 *) array,
 195                         h, pwhich);
 196       return;
 197 #endif
 198
 199     default:
 200       break;
 201
 202   }
 203
 204   extent[0] = 1;
 205   count[0] = 0;
 206   n = 0;
 207
 208   /* Initialized for avoiding compiler warnings.  */
 209   roffset = size;
 210   soffset = size;
 211   len = 0;
 212
 213   for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
 214     {
 215       if (dim == which)
 216         {
 217           roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
 218           if (roffset == 0)
 219             roffset = size;
 220           soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
 221           if (soffset == 0)
 222             soffset = size;
 223           len = GFC_DESCRIPTOR_EXTENT(array,dim);
 224         }
 225       else
 226         {
 227           count[n] = 0;
 228           extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
 229           rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
 230           sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
 231
 232           hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
 233           n++;
 234         }
 235     }
 236   if (sstride[0] == 0)
 237     sstride[0] = size;
 238   if (rstride[0] == 0)
 239     rstride[0] = size;
 240   if (hstride[0] == 0)
 241     hstride[0] = 1;
 242
 243   dim = GFC_DESCRIPTOR_RANK (array);
 244   rstride0 = rstride[0];
 245   sstride0 = sstride[0];
 246   hstride0 = hstride[0];
 247   rptr = ret->base_addr;
 248   sptr = array->base_addr;
 249   hptr = h->base_addr;
 250
 251   while (rptr)
 252     {
 253       /* Do the shift for this dimension.  */
 254       sh = *hptr;
 255       /* Normal case should be -len < sh < len; try to
 256          avoid the expensive remainder operation if possible.  */
 257       if (sh < 0)
 258         sh += len;
 259       if (unlikely (sh >= len || sh < 0))
 260         {
 261           sh = sh % len;
 262           if (sh < 0)
 263             sh += len;
 264         }
 265
 266       src = &sptr[sh * soffset];
 267       dest = rptr;
 268       if (soffset == size && roffset == size)
 269       {
 270         size_t len1 = sh * size;
 271         size_t len2 = (len - sh) * size;
 272         memcpy (rptr, sptr + len1, len2);
 273         memcpy (rptr + len2, sptr, len1);
 274       }
 275       else
 276         {
 277           for (n = 0; n < len - sh; n++)
 278             {
 279               memcpy (dest, src, size);
 280               dest += roffset;
 281               src += soffset;
 282             }
 283             for (src = sptr, n = 0; n < sh; n++)
 284               {
 285                 memcpy (dest, src, size);
 286                 dest += roffset;
 287                 src += soffset;
 288               }
 289           }
 290
 291       /* Advance to the next section.  */
 292       rptr += rstride0;
 293       sptr += sstride0;
 294       hptr += hstride0;
 295       count[0]++;
 296       n = 0;
 297       while (count[n] == extent[n])
 298         {
 299           /* When we get to the end of a dimension, reset it and increment
 300              the next dimension.  */
 301           count[n] = 0;
 302           /* We could precalculate these products, but this is a less
 303              frequently used path so probably not worth it.  */
 304           rptr -= rstride[n] * extent[n];
 305           sptr -= sstride[n] * extent[n];
 306           hptr -= hstride[n] * extent[n];
 307           n++;
 308           if (n >= dim - 1)
 309             {
 310               /* Break out of the loop.  */
 311               rptr = NULL;
 312               break;
 313             }
 314           else
 315             {
 316               count[n]++;
 317               rptr += rstride[n];
 318               sptr += sstride[n];
 319               hptr += hstride[n];
 320             }
 321         }
 322     }
 323 }
 324
 325 void cshift1_4 (gfc_array_char * const restrict,
 326         const gfc_array_char * const restrict,
 327         const gfc_array_i4 * const restrict,
 328         const GFC_INTEGER_4 * const restrict);
 329 export_proto(cshift1_4);
 330
 331 void
 332 cshift1_4 (gfc_array_char * const restrict ret,
 333         const gfc_array_char * const restrict array,
 334         const gfc_array_i4 * const restrict h,
 335         const GFC_INTEGER_4 * const restrict pwhich)
 336 {
 337   cshift1 (ret, array, h, pwhich);
 338 }
 339
 340
 341 void cshift1_4_char (gfc_array_char * const restrict ret,
 342         GFC_INTEGER_4,
 343         const gfc_array_char * const restrict array,
 344         const gfc_array_i4 * const restrict h,
 345         const GFC_INTEGER_4 * const restrict pwhich,
 346         GFC_INTEGER_4);
 347 export_proto(cshift1_4_char);
 348
 349 void
 350 cshift1_4_char (gfc_array_char * const restrict ret,
 351         GFC_INTEGER_4 ret_length __attribute__((unused)),
 352         const gfc_array_char * const restrict array,
 353         const gfc_array_i4 * const restrict h,
 354         const GFC_INTEGER_4 * const restrict pwhich,
 355         GFC_INTEGER_4 array_length __attribute__((unused)))
 356 {
 357   cshift1 (ret, array, h, pwhich);
 358 }
 359
 360
 361 void cshift1_4_char4 (gfc_array_char * const restrict ret,
 362         GFC_INTEGER_4,
 363         const gfc_array_char * const restrict array,
 364         const gfc_array_i4 * const restrict h,
 365         const GFC_INTEGER_4 * const restrict pwhich,
 366         GFC_INTEGER_4);
 367 export_proto(cshift1_4_char4);
 368
 369 void
 370 cshift1_4_char4 (gfc_array_char * const restrict ret,
 371         GFC_INTEGER_4 ret_length __attribute__((unused)),
 372         const gfc_array_char * const restrict array,
 373         const gfc_array_i4 * const restrict h,
 374         const GFC_INTEGER_4 * const restrict pwhich,
 375         GFC_INTEGER_4 array_length __attribute__((unused)))
 376 {
 377   cshift1 (ret, array, h, pwhich);
 378 }
 379
 380 #endif