libgfortran/generated/cshift1_8.c

   1 /* Implementation of the CSHIFT intrinsic
   2    Copyright 2003, 2007, 2009 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 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 <stdlib.h>
  28 #include <assert.h>
  29 #include <string.h>
  30
  31
  32 #if defined (HAVE_GFC_INTEGER_8)
  33
  34 static void
  35 cshift1 (gfc_array_char * const restrict ret,
  36         const gfc_array_char * const restrict array,
  37         const gfc_array_i8 * const restrict h,
  38         const GFC_INTEGER_8 * const restrict pwhich,
  39         index_type size)
  40 {
  41   /* r.* indicates the return array.  */
  42   index_type rstride[GFC_MAX_DIMENSIONS];
  43   index_type rstride0;
  44   index_type roffset;
  45   char *rptr;
  46   char *dest;
  47   /* s.* indicates the source array.  */
  48   index_type sstride[GFC_MAX_DIMENSIONS];
  49   index_type sstride0;
  50   index_type soffset;
  51   const char *sptr;
  52   const char *src;
  53   /* h.* indicates the shift array.  */
  54   index_type hstride[GFC_MAX_DIMENSIONS];
  55   index_type hstride0;
  56   const GFC_INTEGER_8 *hptr;
  57
  58   index_type count[GFC_MAX_DIMENSIONS];
  59   index_type extent[GFC_MAX_DIMENSIONS];
  60   index_type dim;
  61   index_type len;
  62   index_type n;
  63   int which;
  64   GFC_INTEGER_8 sh;
  65   index_type arraysize;
  66
  67   if (pwhich)
  68     which = *pwhich - 1;
  69   else
  70     which = 0;
  71
  72   if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
  73     runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
  74
  75   arraysize = size0 ((array_t *)array);
  76
  77   if (ret->data == NULL)
  78     {
  79       int i;
  80
  81       ret->data = internal_malloc_size (size * arraysize);
  82       ret->offset = 0;
  83       ret->dtype = array->dtype;
  84       for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  85         {
  86           ret->dim[i].lbound = 0;
  87           ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
  88
  89           if (i == 0)
  90             ret->dim[i].stride = 1;
  91           else
  92             ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
  93         }
  94     }
  95
  96   if (arraysize == 0)
  97     return;
  98
  99   extent[0] = 1;
 100   count[0] = 0;
 101   n = 0;
 102
 103   /* Initialized for avoiding compiler warnings.  */
 104   roffset = size;
 105   soffset = size;
 106   len = 0;
 107
 108   for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
 109     {
 110       if (dim == which)
 111         {
 112           roffset = ret->dim[dim].stride * size;
 113           if (roffset == 0)
 114             roffset = size;
 115           soffset = array->dim[dim].stride * size;
 116           if (soffset == 0)
 117             soffset = size;
 118           len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
 119         }
 120       else
 121         {
 122           count[n] = 0;
 123           extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
 124           rstride[n] = ret->dim[dim].stride * size;
 125           sstride[n] = array->dim[dim].stride * size;
 126
 127           hstride[n] = h->dim[n].stride;
 128           n++;
 129         }
 130     }
 131   if (sstride[0] == 0)
 132     sstride[0] = size;
 133   if (rstride[0] == 0)
 134     rstride[0] = size;
 135   if (hstride[0] == 0)
 136     hstride[0] = 1;
 137
 138   dim = GFC_DESCRIPTOR_RANK (array);
 139   rstride0 = rstride[0];
 140   sstride0 = sstride[0];
 141   hstride0 = hstride[0];
 142   rptr = ret->data;
 143   sptr = array->data;
 144   hptr = h->data;
 145
 146   while (rptr)
 147     {
 148       /* Do the shift for this dimension.  */
 149       sh = *hptr;
 150       sh = (div (sh, len)).rem;
 151       if (sh < 0)
 152         sh += len;
 153
 154       src = &sptr[sh * soffset];
 155       dest = rptr;
 156
 157       for (n = 0; n < len; n++)
 158         {
 159           memcpy (dest, src, size);
 160           dest += roffset;
 161           if (n == len - sh - 1)
 162             src = sptr;
 163           else
 164             src += soffset;
 165         }
 166
 167       /* Advance to the next section.  */
 168       rptr += rstride0;
 169       sptr += sstride0;
 170       hptr += hstride0;
 171       count[0]++;
 172       n = 0;
 173       while (count[n] == extent[n])
 174         {
 175           /* When we get to the end of a dimension, reset it and increment
 176              the next dimension.  */
 177           count[n] = 0;
 178           /* We could precalculate these products, but this is a less
 179              frequently used path so probably not worth it.  */
 180           rptr -= rstride[n] * extent[n];
 181           sptr -= sstride[n] * extent[n];
 182           hptr -= hstride[n] * extent[n];
 183           n++;
 184           if (n >= dim - 1)
 185             {
 186               /* Break out of the loop.  */
 187               rptr = NULL;
 188               break;
 189             }
 190           else
 191             {
 192               count[n]++;
 193               rptr += rstride[n];
 194               sptr += sstride[n];
 195               hptr += hstride[n];
 196             }
 197         }
 198     }
 199 }
 200
 201 void cshift1_8 (gfc_array_char * const restrict,
 202         const gfc_array_char * const restrict,
 203         const gfc_array_i8 * const restrict,
 204         const GFC_INTEGER_8 * const restrict);
 205 export_proto(cshift1_8);
 206
 207 void
 208 cshift1_8 (gfc_array_char * const restrict ret,
 209         const gfc_array_char * const restrict array,
 210         const gfc_array_i8 * const restrict h,
 211         const GFC_INTEGER_8 * const restrict pwhich)
 212 {
 213   cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
 214 }
 215
 216
 217 void cshift1_8_char (gfc_array_char * const restrict ret,
 218         GFC_INTEGER_4,
 219         const gfc_array_char * const restrict array,
 220         const gfc_array_i8 * const restrict h,
 221         const GFC_INTEGER_8 * const restrict pwhich,
 222         GFC_INTEGER_4);
 223 export_proto(cshift1_8_char);
 224
 225 void
 226 cshift1_8_char (gfc_array_char * const restrict ret,
 227         GFC_INTEGER_4 ret_length __attribute__((unused)),
 228         const gfc_array_char * const restrict array,
 229         const gfc_array_i8 * const restrict h,
 230         const GFC_INTEGER_8 * const restrict pwhich,
 231         GFC_INTEGER_4 array_length)
 232 {
 233   cshift1 (ret, array, h, pwhich, array_length);
 234 }
 235
 236
 237 void cshift1_8_char4 (gfc_array_char * const restrict ret,
 238         GFC_INTEGER_4,
 239         const gfc_array_char * const restrict array,
 240         const gfc_array_i8 * const restrict h,
 241         const GFC_INTEGER_8 * const restrict pwhich,
 242         GFC_INTEGER_4);
 243 export_proto(cshift1_8_char4);
 244
 245 void
 246 cshift1_8_char4 (gfc_array_char * const restrict ret,
 247         GFC_INTEGER_4 ret_length __attribute__((unused)),
 248         const gfc_array_char * const restrict array,
 249         const gfc_array_i8 * const restrict h,
 250         const GFC_INTEGER_8 * const restrict pwhich,
 251         GFC_INTEGER_4 array_length)
 252 {
 253   cshift1 (ret, array, h, pwhich, array_length * sizeof (gfc_char4_t));
 254 }
 255
 256 #endif