libgfortran/m4/cshift1.m4

   1 `/* Implementation of the CSHIFT intrinsic
   2    Copyright (C) 2003-2015 Free Software Foundation, Inc.
   3    Contributed by Feng Wang <wf_cs@yahoo.com>
   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 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 include(iparm.m4)dnl
  32
  33 `#if defined (HAVE_'atype_name`)
  34
  35 static void
  36 cshift1 (gfc_array_char * const restrict ret,
  37         const gfc_array_char * const restrict array,
  38         const 'atype` * const restrict h,
  39         const 'atype_name` * const restrict pwhich)
  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 'atype_name` *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   'atype_name` sh;
  65   index_type arraysize;
  66   index_type size;
  67
  68   if (pwhich)
  69     which = *pwhich - 1;
  70   else
  71     which = 0;
  72
  73   if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
  74     runtime_error ("Argument ''`DIM''` is out of range in call to ''`CSHIFT''`");
  75
  76   size = GFC_DESCRIPTOR_SIZE(array);
  77
  78   arraysize = size0 ((array_t *)array);
  79
  80   if (ret->base_addr == NULL)
  81     {
  82       int i;
  83
  84       ret->base_addr = xmallocarray (arraysize, size);
  85       ret->offset = 0;
  86       ret->dtype = array->dtype;
  87       for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
  88         {
  89           index_type ub, str;
  90
  91           ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
  92
  93           if (i == 0)
  94             str = 1;
  95           else
  96             str = GFC_DESCRIPTOR_EXTENT(ret,i-1) *
  97               GFC_DESCRIPTOR_STRIDE(ret,i-1);
  98
  99           GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
 100         }
 101     }
 102   else if (unlikely (compile_options.bounds_check))
 103     {
 104       bounds_equal_extents ((array_t *) ret, (array_t *) array,
 105                                  "return value", "CSHIFT");
 106     }
 107
 108   if (unlikely (compile_options.bounds_check))
 109     {
 110       bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
 111                               "SHIFT argument", "CSHIFT");
 112     }
 113
 114   if (arraysize == 0)
 115     return;
 116
 117   extent[0] = 1;
 118   count[0] = 0;
 119   n = 0;
 120
 121   /* Initialized for avoiding compiler warnings.  */
 122   roffset = size;
 123   soffset = size;
 124   len = 0;
 125
 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       sh = (div (sh, len)).rem;
 169       if (sh < 0)
 170         sh += len;
 171
 172       src = &sptr[sh * soffset];
 173       dest = rptr;
 174
 175       for (n = 0; n < len; n++)
 176         {
 177           memcpy (dest, src, size);
 178           dest += roffset;
 179           if (n == len - sh - 1)
 180             src = sptr;
 181           else
 182             src += soffset;
 183         }
 184
 185       /* Advance to the next section.  */
 186       rptr += rstride0;
 187       sptr += sstride0;
 188       hptr += hstride0;
 189       count[0]++;
 190       n = 0;
 191       while (count[n] == extent[n])
 192         {
 193           /* When we get to the end of a dimension, reset it and increment
 194              the next dimension.  */
 195           count[n] = 0;
 196           /* We could precalculate these products, but this is a less
 197              frequently used path so probably not worth it.  */
 198           rptr -= rstride[n] * extent[n];
 199           sptr -= sstride[n] * extent[n];
 200           hptr -= hstride[n] * extent[n];
 201           n++;
 202           if (n >= dim - 1)
 203             {
 204               /* Break out of the loop.  */
 205               rptr = NULL;
 206               break;
 207             }
 208           else
 209             {
 210               count[n]++;
 211               rptr += rstride[n];
 212               sptr += sstride[n];
 213               hptr += hstride[n];
 214             }
 215         }
 216     }
 217 }
 218
 219 void cshift1_'atype_kind` (gfc_array_char * const restrict,
 220         const gfc_array_char * const restrict,
 221         const 'atype` * const restrict,
 222         const 'atype_name` * const restrict);
 223 export_proto(cshift1_'atype_kind`);
 224
 225 void
 226 cshift1_'atype_kind` (gfc_array_char * const restrict ret,
 227         const gfc_array_char * const restrict array,
 228         const 'atype` * const restrict h,
 229         const 'atype_name` * const restrict pwhich)
 230 {
 231   cshift1 (ret, array, h, pwhich);
 232 }
 233
 234
 235 void cshift1_'atype_kind`_char (gfc_array_char * const restrict ret,
 236         GFC_INTEGER_4,
 237         const gfc_array_char * const restrict array,
 238         const 'atype` * const restrict h,
 239         const 'atype_name` * const restrict pwhich,
 240         GFC_INTEGER_4);
 241 export_proto(cshift1_'atype_kind`_char);
 242
 243 void
 244 cshift1_'atype_kind`_char (gfc_array_char * const restrict ret,
 245         GFC_INTEGER_4 ret_length __attribute__((unused)),
 246         const gfc_array_char * const restrict array,
 247         const 'atype` * const restrict h,
 248         const 'atype_name` * const restrict pwhich,
 249         GFC_INTEGER_4 array_length __attribute__((unused)))
 250 {
 251   cshift1 (ret, array, h, pwhich);
 252 }
 253
 254
 255 void cshift1_'atype_kind`_char4 (gfc_array_char * const restrict ret,
 256         GFC_INTEGER_4,
 257         const gfc_array_char * const restrict array,
 258         const 'atype` * const restrict h,
 259         const 'atype_name` * const restrict pwhich,
 260         GFC_INTEGER_4);
 261 export_proto(cshift1_'atype_kind`_char4);
 262
 263 void
 264 cshift1_'atype_kind`_char4 (gfc_array_char * const restrict ret,
 265         GFC_INTEGER_4 ret_length __attribute__((unused)),
 266         const gfc_array_char * const restrict array,
 267         const 'atype` * const restrict h,
 268         const 'atype_name` * const restrict pwhich,
 269         GFC_INTEGER_4 array_length __attribute__((unused)))
 270 {
 271   cshift1 (ret, array, h, pwhich);
 272 }
 273
 274 #endif'