libgfortran/intrinsics/transpose_generic.c

   1 /* Implementation of the TRANSPOSE intrinsic
   2    Copyright 2003, 2006, 2007, 2009 Free Software Foundation, Inc.
   3    Contributed by Tobias Schlüter
   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 Libgfortran 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 <string.h>
  29 #include <assert.h>
  30
  31 extern void transpose (gfc_array_char *, gfc_array_char *);
  32 export_proto(transpose);
  33
  34 static void
  35 transpose_internal (gfc_array_char *ret, gfc_array_char *source)
  36 {
  37   /* r.* indicates the return array.  */
  38   index_type rxstride, rystride;
  39   char *rptr;
  40   /* s.* indicates the source array.  */
  41   index_type sxstride, systride;
  42   const char *sptr;
  43
  44   index_type xcount, ycount;
  45   index_type x, y;
  46   index_type size;
  47
  48   assert (GFC_DESCRIPTOR_RANK (source) == 2
  49           && GFC_DESCRIPTOR_RANK (ret) == 2);
  50
  51   size = GFC_DESCRIPTOR_SIZE(ret);
  52
  53   if (ret->data == NULL)
  54     {
  55       assert (ret->dtype == source->dtype);
  56
  57       GFC_DIMENSION_SET(ret->dim[0], 0, GFC_DESCRIPTOR_EXTENT(source,1) - 1,
  58                         1);
  59
  60       GFC_DIMENSION_SET(ret->dim[1], 0, GFC_DESCRIPTOR_EXTENT(source,0) - 1,
  61                         GFC_DESCRIPTOR_EXTENT(source, 1));
  62
  63       ret->data = internal_malloc_size (size * size0 ((array_t*)ret));
  64       ret->offset = 0;
  65     }
  66   else if (unlikely (compile_options.bounds_check))
  67     {
  68       index_type ret_extent, src_extent;
  69
  70       ret_extent = GFC_DESCRIPTOR_EXTENT(ret,0);
  71       src_extent = GFC_DESCRIPTOR_EXTENT(source,1);
  72
  73       if (src_extent != ret_extent)
  74         runtime_error ("Incorrect extent in return value of TRANSPOSE"
  75                        " intrinsic in dimension 1: is %ld,"
  76                        " should be %ld", (long int) src_extent,
  77                        (long int) ret_extent);
  78
  79       ret_extent = GFC_DESCRIPTOR_EXTENT(ret,1);
  80       src_extent = GFC_DESCRIPTOR_EXTENT(source,0);
  81
  82       if (src_extent != ret_extent)
  83         runtime_error ("Incorrect extent in return value of TRANSPOSE"
  84                        " intrinsic in dimension 2: is %ld,"
  85                        " should be %ld", (long int) src_extent,
  86                        (long int) ret_extent);
  87
  88     }
  89
  90   sxstride = GFC_DESCRIPTOR_STRIDE_BYTES(source,0);
  91   systride = GFC_DESCRIPTOR_STRIDE_BYTES(source,1);
  92   xcount = GFC_DESCRIPTOR_EXTENT(source,0);
  93   ycount = GFC_DESCRIPTOR_EXTENT(source,1);
  94
  95   rxstride = GFC_DESCRIPTOR_STRIDE_BYTES(ret,0);
  96   rystride = GFC_DESCRIPTOR_STRIDE_BYTES(ret,1);
  97
  98   rptr = ret->data;
  99   sptr = source->data;
 100
 101   for (y = 0; y < ycount; y++)
 102     {
 103       for (x = 0; x < xcount; x++)
 104         {
 105           memcpy (rptr, sptr, size);
 106
 107           sptr += sxstride;
 108           rptr += rystride;
 109         }
 110       sptr += systride - (sxstride * xcount);
 111       rptr += rxstride - (rystride * xcount);
 112     }
 113 }
 114
 115
 116 extern void transpose (gfc_array_char *, gfc_array_char *);
 117 export_proto(transpose);
 118
 119 void
 120 transpose (gfc_array_char *ret, gfc_array_char *source)
 121 {
 122   transpose_internal (ret, source);
 123 }
 124
 125
 126 extern void transpose_char (gfc_array_char *, GFC_INTEGER_4,
 127                             gfc_array_char *, GFC_INTEGER_4);
 128 export_proto(transpose_char);
 129
 130 void
 131 transpose_char (gfc_array_char *ret,
 132                 GFC_INTEGER_4 ret_length __attribute__((unused)),
 133                 gfc_array_char *source,
 134                 GFC_INTEGER_4 source_length __attribute__((unused)))
 135 {
 136   transpose_internal (ret, source);
 137 }
 138
 139
 140 extern void transpose_char4 (gfc_array_char *, GFC_INTEGER_4,
 141                              gfc_array_char *, GFC_INTEGER_4);
 142 export_proto(transpose_char4);
 143
 144 void
 145 transpose_char4 (gfc_array_char *ret,
 146                  GFC_INTEGER_4 ret_length __attribute__((unused)),
 147                  gfc_array_char *source,
 148                  GFC_INTEGER_4 source_length __attribute__((unused)))
 149 {
 150   transpose_internal (ret, source);
 151 }