libgfortran/generated/in_unpack_c4.c

   1 /* Helper function for repacking arrays.
   2    Copyright 2003, 2006, 2007, 2009 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   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 <assert.h>
  29 #include <string.h>
  30
  31
  32 #if defined (HAVE_GFC_COMPLEX_4)
  33
  34 void
  35 internal_unpack_c4 (gfc_array_c4 * d, const GFC_COMPLEX_4 * src)
  36 {
  37   index_type count[GFC_MAX_DIMENSIONS];
  38   index_type extent[GFC_MAX_DIMENSIONS];
  39   index_type stride[GFC_MAX_DIMENSIONS];
  40   index_type stride0;
  41   index_type dim;
  42   index_type dsize;
  43   GFC_COMPLEX_4 * restrict dest;
  44   int n;
  45
  46   dest = d->data;
  47   if (src == dest || !src)
  48     return;
  49
  50   dim = GFC_DESCRIPTOR_RANK (d);
  51   dsize = 1;
  52   for (n = 0; n < dim; n++)
  53     {
  54       count[n] = 0;
  55       stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);
  56       extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);
  57       if (extent[n] <= 0)
  58         return;
  59
  60       if (dsize == stride[n])
  61         dsize *= extent[n];
  62       else
  63         dsize = 0;
  64     }
  65
  66   if (dsize != 0)
  67     {
  68       memcpy (dest, src, dsize * sizeof (GFC_COMPLEX_4));
  69       return;
  70     }
  71
  72   stride0 = stride[0];
  73
  74   while (dest)
  75     {
  76       /* Copy the data.  */
  77       *dest = *(src++);
  78       /* Advance to the next element.  */
  79       dest += stride0;
  80       count[0]++;
  81       /* Advance to the next source element.  */
  82       n = 0;
  83       while (count[n] == extent[n])
  84         {
  85           /* When we get to the end of a dimension, reset it and increment
  86              the next dimension.  */
  87           count[n] = 0;
  88           /* We could precalculate these products, but this is a less
  89              frequently used path so probably not worth it.  */
  90           dest -= stride[n] * extent[n];
  91           n++;
  92           if (n == dim)
  93             {
  94               dest = NULL;
  95               break;
  96             }
  97           else
  98             {
  99               count[n]++;
 100               dest += stride[n];
 101             }
 102         }
 103     }
 104 }
 105
 106 #endif
 107