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       for (n = 0; n < len - delta; n++)
 187         {
 188           memcpy (dest, src, size);
 189           dest += roffset;
 190           src += soffset;
 191         }
 192       if (sh < 0)
 193         dest = rptr;
 194       n = delta;
 195
 196       if (pbound)
 197         while (n--)
 198           {
 199             memcpy (dest, pbound, size);
 200             dest += roffset;
 201           }
 202       else
 203         while (n--)
 204           {
 205             index_type i;
 206
 207             if (filler_len == 1)
 208               memset (dest, filler[0], size);
 209             else
 210               for (i = 0; i < size; i += filler_len)
 211                 memcpy (&dest[i], filler, filler_len);
 212
 213             dest += roffset;
 214           }
 215
 216       /* Advance to the next section.  */
 217       rptr += rstride0;
 218       sptr += sstride0;
 219       hptr += hstride0;
 220       count[0]++;
 221       n = 0;
 222       while (count[n] == extent[n])
 223         {
 224           /* When we get to the end of a dimension, reset it and increment
 225              the next dimension.  */
 226           count[n] = 0;
 227           /* We could precalculate these products, but this is a less
 228              frequently used path so probably not worth it.  */
 229           rptr -= rstride[n] * extent[n];
 230           sptr -= sstride[n] * extent[n];
 231           hptr -= hstride[n] * extent[n];
 232           n++;
 233           if (n >= dim - 1)
 234             {
 235               /* Break out of the loop.  */
 236               rptr = NULL;
 237               break;
 238             }
 239           else
 240             {
 241               count[n]++;
 242               rptr += rstride[n];
 243               sptr += sstride[n];
 244               hptr += hstride[n];
 245             }
 246         }
 247     }
 248 }
 249
 250 void eoshift1_4 (gfc_array_char * const restrict,
 251         const gfc_array_char * const restrict,
 252         const gfc_array_i4 * const restrict, const char * const restrict,
 253         const GFC_INTEGER_4 * const restrict);
 254 export_proto(eoshift1_4);
 255
 256 void
 257 eoshift1_4 (gfc_array_char * const restrict ret,
 258         const gfc_array_char * const restrict array,
 259         const gfc_array_i4 * const restrict h,
 260         const char * const restrict pbound,
 261         const GFC_INTEGER_4 * const restrict pwhich)
 262 {
 263   eoshift1 (ret, array, h, pbound, pwhich, "\0", 1);
 264 }
 265
 266
 267 void eoshift1_4_char (gfc_array_char * const restrict,
 268         GFC_INTEGER_4,
 269         const gfc_array_char * const restrict,
 270         const gfc_array_i4 * const restrict,
 271         const char * const restrict,
 272         const GFC_INTEGER_4 * const restrict,
 273         GFC_INTEGER_4, GFC_INTEGER_4);
 274 export_proto(eoshift1_4_char);
 275
 276 void
 277 eoshift1_4_char (gfc_array_char * const restrict ret,
 278         GFC_INTEGER_4 ret_length __attribute__((unused)),
 279         const gfc_array_char * const restrict array,
 280         const gfc_array_i4 * const restrict h,
 281         const char *  const restrict pbound,
 282         const GFC_INTEGER_4 * const restrict pwhich,
 283         GFC_INTEGER_4 array_length __attribute__((unused)),
 284         GFC_INTEGER_4 bound_length __attribute__((unused)))
 285 {
 286   eoshift1 (ret, array, h, pbound, pwhich, " ", 1);
 287 }
 288
 289
 290 void eoshift1_4_char4 (gfc_array_char * const restrict,
 291         GFC_INTEGER_4,
 292         const gfc_array_char * const restrict,
 293         const gfc_array_i4 * const restrict,
 294         const char * const restrict,
 295         const GFC_INTEGER_4 * const restrict,
 296         GFC_INTEGER_4, GFC_INTEGER_4);
 297 export_proto(eoshift1_4_char4);
 298
 299 void
 300 eoshift1_4_char4 (gfc_array_char * const restrict ret,
 301         GFC_INTEGER_4 ret_length __attribute__((unused)),
 302         const gfc_array_char * const restrict array,
 303         const gfc_array_i4 * const restrict h,
 304         const char *  const restrict pbound,
 305         const GFC_INTEGER_4 * const restrict pwhich,
 306         GFC_INTEGER_4 array_length __attribute__((unused)),
 307         GFC_INTEGER_4 bound_length __attribute__((unused)))
 308 {
 309   static const gfc_char4_t space = (unsigned char) ' ';
 310   eoshift1 (ret, array, h, pbound, pwhich,
 311             (const char *) &space, sizeof (gfc_char4_t));
 312 }
 313
 314 #endif