libgfortran/intrinsics/transpose_generic.c

   1 /* Implementation of the TRANSPOSE intrinsic
   2    Copyright 2003, 2006 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 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 Libgfortran 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 "config.h"
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <assert.h>
  35 #include "libgfortran.h"
  36
  37 extern void transpose (gfc_array_char *, gfc_array_char *);
  38 export_proto(transpose);
  39
  40 static void
  41 transpose_internal (gfc_array_char *ret, gfc_array_char *source,
  42                     index_type size)
  43 {
  44   /* r.* indicates the return array.  */
  45   index_type rxstride, rystride;
  46   char *rptr;
  47   /* s.* indicates the source array.  */
  48   index_type sxstride, systride;
  49   const char *sptr;
  50
  51   index_type xcount, ycount;
  52   index_type x, y;
  53
  54   assert (GFC_DESCRIPTOR_RANK (source) == 2
  55           && GFC_DESCRIPTOR_RANK (ret) == 2);
  56
  57   if (ret->data == NULL)
  58     {
  59       assert (ret->dtype == source->dtype);
  60
  61       ret->dim[0].lbound = 0;
  62       ret->dim[0].ubound = source->dim[1].ubound - source->dim[1].lbound;
  63       ret->dim[0].stride = 1;
  64
  65       ret->dim[1].lbound = 0;
  66       ret->dim[1].ubound = source->dim[0].ubound - source->dim[0].lbound;
  67       ret->dim[1].stride = ret->dim[0].ubound+1;
  68
  69       ret->data = internal_malloc_size (size * size0 ((array_t*)ret));
  70       ret->offset = 0;
  71     }
  72
  73   sxstride = source->dim[0].stride * size;
  74   systride = source->dim[1].stride * size;
  75   xcount = source->dim[0].ubound + 1 - source->dim[0].lbound;
  76   ycount = source->dim[1].ubound + 1 - source->dim[1].lbound;
  77
  78   rxstride = ret->dim[0].stride * size;
  79   rystride = ret->dim[1].stride * size;
  80
  81   rptr = ret->data;
  82   sptr = source->data;
  83
  84   for (y = 0; y < ycount; y++)
  85     {
  86       for (x = 0; x < xcount; x++)
  87         {
  88           memcpy (rptr, sptr, size);
  89
  90           sptr += sxstride;
  91           rptr += rystride;
  92         }
  93       sptr += systride - (sxstride * xcount);
  94       rptr += rxstride - (rystride * xcount);
  95     }
  96 }
  97
  98 extern void transpose (gfc_array_char *, gfc_array_char *);
  99 export_proto(transpose);
 100
 101 void
 102 transpose (gfc_array_char *ret, gfc_array_char *source)
 103 {
 104   transpose_internal (ret, source, GFC_DESCRIPTOR_SIZE (source));
 105 }
 106
 107 extern void transpose_char (gfc_array_char *, GFC_INTEGER_4,
 108                             gfc_array_char *, GFC_INTEGER_4);
 109 export_proto(transpose_char);
 110
 111 void
 112 transpose_char (gfc_array_char *ret,
 113                 GFC_INTEGER_4 ret_length __attribute__((unused)),
 114                 gfc_array_char *source, GFC_INTEGER_4 source_length)
 115 {
 116   transpose_internal (ret, source, source_length);
 117 }