libgfortran/m4/cshift1.m4

   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 include(iparm.m4)dnl
  37
  38 `#if defined (HAVE_'atype_name`)
  39
  40 static void
  41 cshift1 (gfc_array_char * const restrict ret,
  42         const gfc_array_char * const restrict array,
  43         const 'atype` * const restrict h,
  44         const 'atype_name` * const restrict pwhich,
  45         index_type size)
  46 {
  47   /* r.* indicates the return array.  */
  48   index_type rstride[GFC_MAX_DIMENSIONS];
  49   index_type rstride0;
  50   index_type roffset;
  51   char *rptr;
  52   char *dest;
  53   /* s.* indicates the source array.  */
  54   index_type sstride[GFC_MAX_DIMENSIONS];
  55   index_type sstride0;
  56   index_type soffset;
  57   const char *sptr;
  58   const char *src;
  59   /* h.* indicates the shift array.  */
  60   index_type hstride[GFC_MAX_DIMENSIONS];
  61   index_type hstride0;
  62   const 'atype_name` *hptr;
  63
  64   index_type count[GFC_MAX_DIMENSIONS];
  65   index_type extent[GFC_MAX_DIMENSIONS];
  66   index_type dim;
  67   index_type len;
  68   index_type n;
  69   int which;
  70   'atype_name` sh;
  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   if (ret->data == NULL)
  81     {
  82       int i;
  83
  84       ret->data = internal_malloc_size (size * size0 ((array_t *)array));
  85       ret->offset = 0;
  86       ret->dtype = array->dtype;
  87       for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  88         {
  89           ret->dim[i].lbound = 0;
  90           ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
  91
  92           if (i == 0)
  93             ret->dim[i].stride = 1;
  94           else
  95             ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
  96         }
  97     }
  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_'atype_kind` (gfc_array_char * const restrict,
 202         const gfc_array_char * const restrict,
 203         const 'atype` * const restrict,
 204         const 'atype_name` * const restrict);
 205 export_proto(cshift1_'atype_kind`);
 206
 207 void
 208 cshift1_'atype_kind` (gfc_array_char * const restrict ret,
 209         const gfc_array_char * const restrict array,
 210         const 'atype` * const restrict h,
 211         const 'atype_name` * const restrict pwhich)
 212 {
 213   cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
 214 }
 215
 216
 217 void cshift1_'atype_kind`_char (gfc_array_char * const restrict ret,
 218         GFC_INTEGER_4,
 219         const gfc_array_char * const restrict array,
 220         const 'atype` * const restrict h,
 221         const 'atype_name` * const restrict pwhich,
 222         GFC_INTEGER_4);
 223 export_proto(cshift1_'atype_kind`_char);
 224
 225 void
 226 cshift1_'atype_kind`_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 'atype` * const restrict h,
 230         const 'atype_name` * const restrict pwhich,
 231         GFC_INTEGER_4 array_length)
 232 {
 233   cshift1 (ret, array, h, pwhich, array_length);
 234 }
 235
 236
 237 void cshift1_'atype_kind`_char4 (gfc_array_char * const restrict ret,
 238         GFC_INTEGER_4,
 239         const gfc_array_char * const restrict array,
 240         const 'atype` * const restrict h,
 241         const 'atype_name` * const restrict pwhich,
 242         GFC_INTEGER_4);
 243 export_proto(cshift1_'atype_kind`_char4);
 244
 245 void
 246 cshift1_'atype_kind`_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 'atype` * const restrict h,
 250         const 'atype_name` * 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'