libgfortran/generated/cshift1_8.c

   1 /* Implementation of the CSHIFT intrinsic
   2    Copyright 2003, 2007 Free Software Foundation, Inc.
   3    Contributed by Feng Wang <wf_cs@yahoo.com>
   4
   5 This file is part of the GNU Fortran 95 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 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Ligbfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "libgfortran.h"
  32 #include <stdlib.h>
  33 #include <assert.h>
  34 #include <string.h>
  35
  36
  37 #if defined (HAVE_GFC_INTEGER_8)
  38
  39 static void
  40 cshift1 (gfc_array_char * const restrict ret,
  41         const gfc_array_char * const restrict array,
  42         const gfc_array_i8 * const restrict h,
  43         const GFC_INTEGER_8 * const restrict pwhich,
  44         index_type size)
  45 {
  46   /* r.* indicates the return array.  */
  47   index_type rstride[GFC_MAX_DIMENSIONS];
  48   index_type rstride0;
  49   index_type roffset;
  50   char *rptr;
  51   char *dest;
  52   /* s.* indicates the source array.  */
  53   index_type sstride[GFC_MAX_DIMENSIONS];
  54   index_type sstride0;
  55   index_type soffset;
  56   const char *sptr;
  57   const char *src;
  58   /* h.* indicates the shift array.  */
  59   index_type hstride[GFC_MAX_DIMENSIONS];
  60   index_type hstride0;
  61   const GFC_INTEGER_8 *hptr;
  62
  63   index_type count[GFC_MAX_DIMENSIONS];
  64   index_type extent[GFC_MAX_DIMENSIONS];
  65   index_type dim;
  66   index_type len;
  67   index_type n;
  68   int which;
  69   GFC_INTEGER_8 sh;
  70   index_type arraysize;
  71
  72   if (pwhich)
  73     which = *pwhich - 1;
  74   else
  75     which = 0;
  76
  77   if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
  78     runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
  79
  80   arraysize = size0 ((array_t *)array);
  81
  82   if (ret->data == NULL)
  83     {
  84       int i;
  85
  86       ret->data = internal_malloc_size (size * arraysize);
  87       ret->offset = 0;
  88       ret->dtype = array->dtype;
  89       for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  90         {
  91           ret->dim[i].lbound = 0;
  92           ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
  93
  94           if (i == 0)
  95             ret->dim[i].stride = 1;
  96           else
  97             ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
  98         }
  99     }
 100
 101   if (arraysize == 0)
 102     return;
 103
 104   extent[0] = 1;
 105   count[0] = 0;
 106   n = 0;
 107
 108   /* Initialized for avoiding compiler warnings.  */
 109   roffset = size;
 110   soffset = size;
 111   len = 0;
 112
 113   for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
 114     {
 115       if (dim == which)
 116         {
 117           roffset = ret->dim[dim].stride * size;
 118           if (roffset == 0)
 119             roffset = size;
 120           soffset = array->dim[dim].stride * size;
 121           if (soffset == 0)
 122             soffset = size;
 123           len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
 124         }
 125       else
 126         {
 127           count[n] = 0;
 128           extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
 129           rstride[n] = ret->dim[dim].stride * size;
 130           sstride[n] = array->dim[dim].stride * size;
 131
 132           hstride[n] = h->dim[n].stride;
 133           n++;
 134         }
 135     }
 136   if (sstride[0] == 0)
 137     sstride[0] = size;
 138   if (rstride[0] == 0)
 139     rstride[0] = size;
 140   if (hstride[0] == 0)
 141     hstride[0] = 1;
 142
 143   dim = GFC_DESCRIPTOR_RANK (array);
 144   rstride0 = rstride[0];
 145   sstride0 = sstride[0];
 146   hstride0 = hstride[0];
 147   rptr = ret->data;
 148   sptr = array->data;
 149   hptr = h->data;
 150
 151   while (rptr)
 152     {
 153       /* Do the shift for this dimension.  */
 154       sh = *hptr;
 155       sh = (div (sh, len)).rem;
 156       if (sh < 0)
 157         sh += len;
 158
 159       src = &sptr[sh * soffset];
 160       dest = rptr;
 161
 162       for (n = 0; n < len; n++)
 163         {
 164           memcpy (dest, src, size);
 165           dest += roffset;
 166           if (n == len - sh - 1)
 167             src = sptr;
 168           else
 169             src += soffset;
 170         }
 171
 172       /* Advance to the next section.  */
 173       rptr += rstride0;
 174       sptr += sstride0;
 175       hptr += hstride0;
 176       count[0]++;
 177       n = 0;
 178       while (count[n] == extent[n])
 179         {
 180           /* When we get to the end of a dimension, reset it and increment
 181              the next dimension.  */
 182           count[n] = 0;
 183           /* We could precalculate these products, but this is a less
 184              frequently used path so probably not worth it.  */
 185           rptr -= rstride[n] * extent[n];
 186           sptr -= sstride[n] * extent[n];
 187           hptr -= hstride[n] * extent[n];
 188           n++;
 189           if (n >= dim - 1)
 190             {
 191               /* Break out of the loop.  */
 192               rptr = NULL;
 193               break;
 194             }
 195           else
 196             {
 197               count[n]++;
 198               rptr += rstride[n];
 199               sptr += sstride[n];
 200               hptr += hstride[n];
 201             }
 202         }
 203     }
 204 }
 205
 206 void cshift1_8 (gfc_array_char * const restrict,
 207         const gfc_array_char * const restrict,
 208         const gfc_array_i8 * const restrict,
 209         const GFC_INTEGER_8 * const restrict);
 210 export_proto(cshift1_8);
 211
 212 void
 213 cshift1_8 (gfc_array_char * const restrict ret,
 214         const gfc_array_char * const restrict array,
 215         const gfc_array_i8 * const restrict h,
 216         const GFC_INTEGER_8 * const restrict pwhich)
 217 {
 218   cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
 219 }
 220
 221
 222 void cshift1_8_char (gfc_array_char * const restrict ret,
 223         GFC_INTEGER_4,
 224         const gfc_array_char * const restrict array,
 225         const gfc_array_i8 * const restrict h,
 226         const GFC_INTEGER_8 * const restrict pwhich,
 227         GFC_INTEGER_4);
 228 export_proto(cshift1_8_char);
 229
 230 void
 231 cshift1_8_char (gfc_array_char * const restrict ret,
 232         GFC_INTEGER_4 ret_length __attribute__((unused)),
 233         const gfc_array_char * const restrict array,
 234         const gfc_array_i8 * const restrict h,
 235         const GFC_INTEGER_8 * const restrict pwhich,
 236         GFC_INTEGER_4 array_length)
 237 {
 238   cshift1 (ret, array, h, pwhich, array_length);
 239 }
 240
 241
 242 void cshift1_8_char4 (gfc_array_char * const restrict ret,
 243         GFC_INTEGER_4,
 244         const gfc_array_char * const restrict array,
 245         const gfc_array_i8 * const restrict h,
 246         const GFC_INTEGER_8 * const restrict pwhich,
 247         GFC_INTEGER_4);
 248 export_proto(cshift1_8_char4);
 249
 250 void
 251 cshift1_8_char4 (gfc_array_char * const restrict ret,
 252         GFC_INTEGER_4 ret_length __attribute__((unused)),
 253         const gfc_array_char * const restrict array,
 254         const gfc_array_i8 * const restrict h,
 255         const GFC_INTEGER_8 * const restrict pwhich,
 256         GFC_INTEGER_4 array_length)
 257 {
 258   cshift1 (ret, array, h, pwhich, array_length * sizeof (gfc_char4_t));
 259 }
 260
 261 #endif