libgfortran/generated/cshift1_16.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_16)
  33
  34 static void
  35 cshift1 (gfc_array_char * const restrict ret,
  36         const gfc_array_char * const restrict array,
  37         const gfc_array_i16 * const restrict h,
  38         const GFC_INTEGER_16 * const restrict pwhich)
  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 *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_16 *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   int which;
  63   GFC_INTEGER_16 sh;
  64   index_type arraysize;
  65   index_type size;
  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   size = GFC_DESCRIPTOR_SIZE(array);
  76
  77   arraysize = size0 ((array_t *)array);
  78
  79   if (ret->data == NULL)
  80     {
  81       int i;
  82
  83       ret->data = internal_malloc_size (size * arraysize);
  84       ret->offset = 0;
  85       ret->dtype = array->dtype;
  86       for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  87         {
  88           index_type ub, str;
  89
  90           ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
  91
  92           if (i == 0)
  93             str = 1;
  94           else
  95             str = GFC_DESCRIPTOR_EXTENT(ret,i-1) *
  96               GFC_DESCRIPTOR_STRIDE(ret,i-1);
  97
  98           GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
  99         }
 100     }
 101   else if (unlikely (compile_options.bounds_check))
 102     {
 103       bounds_equal_extents ((array_t *) ret, (array_t *) array,
 104                                  "return value", "CSHIFT");
 105     }
 106
 107   if (unlikely (compile_options.bounds_check))
 108     {
 109       bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
 110                               "SHIFT argument", "CSHIFT");
 111     }
 112
 113   if (arraysize == 0)
 114     return;
 115
 116   extent[0] = 1;
 117   count[0] = 0;
 118   n = 0;
 119
 120   /* Initialized for avoiding compiler warnings.  */
 121   roffset = size;
 122   soffset = size;
 123   len = 0;
 124
 125   for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
 126     {
 127       if (dim == which)
 128         {
 129           roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
 130           if (roffset == 0)
 131             roffset = size;
 132           soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
 133           if (soffset == 0)
 134             soffset = size;
 135           len = GFC_DESCRIPTOR_EXTENT(array,dim);
 136         }
 137       else
 138         {
 139           count[n] = 0;
 140           extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
 141           rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
 142           sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
 143
 144           hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
 145           n++;
 146         }
 147     }
 148   if (sstride[0] == 0)
 149     sstride[0] = size;
 150   if (rstride[0] == 0)
 151     rstride[0] = size;
 152   if (hstride[0] == 0)
 153     hstride[0] = 1;
 154
 155   dim = GFC_DESCRIPTOR_RANK (array);
 156   rstride0 = rstride[0];
 157   sstride0 = sstride[0];
 158   hstride0 = hstride[0];
 159   rptr = ret->data;
 160   sptr = array->data;
 161   hptr = h->data;
 162
 163   while (rptr)
 164     {
 165       /* Do the shift for this dimension.  */
 166       sh = *hptr;
 167       sh = (div (sh, len)).rem;
 168       if (sh < 0)
 169         sh += len;
 170
 171       src = &sptr[sh * soffset];
 172       dest = rptr;
 173
 174       for (n = 0; n < len; n++)
 175         {
 176           memcpy (dest, src, size);
 177           dest += roffset;
 178           if (n == len - sh - 1)
 179             src = sptr;
 180           else
 181             src += soffset;
 182         }
 183
 184       /* Advance to the next section.  */
 185       rptr += rstride0;
 186       sptr += sstride0;
 187       hptr += hstride0;
 188       count[0]++;
 189       n = 0;
 190       while (count[n] == extent[n])
 191         {
 192           /* When we get to the end of a dimension, reset it and increment
 193              the next dimension.  */
 194           count[n] = 0;
 195           /* We could precalculate these products, but this is a less
 196              frequently used path so probably not worth it.  */
 197           rptr -= rstride[n] * extent[n];
 198           sptr -= sstride[n] * extent[n];
 199           hptr -= hstride[n] * extent[n];
 200           n++;
 201           if (n >= dim - 1)
 202             {
 203               /* Break out of the loop.  */
 204               rptr = NULL;
 205               break;
 206             }
 207           else
 208             {
 209               count[n]++;
 210               rptr += rstride[n];
 211               sptr += sstride[n];
 212               hptr += hstride[n];
 213             }
 214         }
 215     }
 216 }
 217
 218 void cshift1_16 (gfc_array_char * const restrict,
 219         const gfc_array_char * const restrict,
 220         const gfc_array_i16 * const restrict,
 221         const GFC_INTEGER_16 * const restrict);
 222 export_proto(cshift1_16);
 223
 224 void
 225 cshift1_16 (gfc_array_char * const restrict ret,
 226         const gfc_array_char * const restrict array,
 227         const gfc_array_i16 * const restrict h,
 228         const GFC_INTEGER_16 * const restrict pwhich)
 229 {
 230   cshift1 (ret, array, h, pwhich);
 231 }
 232
 233
 234 void cshift1_16_char (gfc_array_char * const restrict ret,
 235         GFC_INTEGER_4,
 236         const gfc_array_char * const restrict array,
 237         const gfc_array_i16 * const restrict h,
 238         const GFC_INTEGER_16 * const restrict pwhich,
 239         GFC_INTEGER_4);
 240 export_proto(cshift1_16_char);
 241
 242 void
 243 cshift1_16_char (gfc_array_char * const restrict ret,
 244         GFC_INTEGER_4 ret_length __attribute__((unused)),
 245         const gfc_array_char * const restrict array,
 246         const gfc_array_i16 * const restrict h,
 247         const GFC_INTEGER_16 * const restrict pwhich,
 248         GFC_INTEGER_4 array_length __attribute__((unused)))
 249 {
 250   cshift1 (ret, array, h, pwhich);
 251 }
 252
 253
 254 void cshift1_16_char4 (gfc_array_char * const restrict ret,
 255         GFC_INTEGER_4,
 256         const gfc_array_char * const restrict array,
 257         const gfc_array_i16 * const restrict h,
 258         const GFC_INTEGER_16 * const restrict pwhich,
 259         GFC_INTEGER_4);
 260 export_proto(cshift1_16_char4);
 261
 262 void
 263 cshift1_16_char4 (gfc_array_char * const restrict ret,
 264         GFC_INTEGER_4 ret_length __attribute__((unused)),
 265         const gfc_array_char * const restrict array,
 266         const gfc_array_i16 * const restrict h,
 267         const GFC_INTEGER_16 * const restrict pwhich,
 268         GFC_INTEGER_4 array_length __attribute__((unused)))
 269 {
 270   cshift1 (ret, array, h, pwhich);
 271 }
 272
 273 #endif