summaryrefslogtreecommitdiff
path: root/libgfortran/generated/cshift1_4_c16.c
blob: e8540bd2c490fc423bf1bbe896d5a0d9e46949b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/* Implementation of the CSHIFT intrinsic.
   Copyright (C) 2017-2018 Free Software Foundation, Inc.
   Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.

Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"
#include <string.h>

#if defined (HAVE_GFC_COMPLEX_16) && defined (HAVE_GFC_INTEGER_4)

void
cshift1_4_c16 (gfc_array_c16 * const restrict ret,
		const gfc_array_c16 * const restrict array,
		const gfc_array_i4 * const restrict h,
		const GFC_INTEGER_4 * const restrict pwhich)
{
  /* r.* indicates the return array.  */
  index_type rstride[GFC_MAX_DIMENSIONS];
  index_type rstride0;
  index_type roffset;
  GFC_COMPLEX_16 *rptr;
  GFC_COMPLEX_16 *dest;
  /* s.* indicates the source array.  */
  index_type sstride[GFC_MAX_DIMENSIONS];
  index_type sstride0;
  index_type soffset;
  const GFC_COMPLEX_16 *sptr;
  const GFC_COMPLEX_16 *src;
  /* h.* indicates the shift array.  */
  index_type hstride[GFC_MAX_DIMENSIONS];
  index_type hstride0;
  const GFC_INTEGER_4 *hptr;

  index_type count[GFC_MAX_DIMENSIONS];
  index_type extent[GFC_MAX_DIMENSIONS];
  index_type rs_ex[GFC_MAX_DIMENSIONS];
  index_type ss_ex[GFC_MAX_DIMENSIONS];
  index_type hs_ex[GFC_MAX_DIMENSIONS];

  index_type dim;
  index_type len;
  index_type n;
  int which;
  GFC_INTEGER_4 sh;

  /* Bounds checking etc is already done by the caller.  */

  if (pwhich)
    which = *pwhich - 1;
  else
    which = 0;

  extent[0] = 1;
  count[0] = 0;
  n = 0;

  /* Initialized for avoiding compiler warnings.  */
  roffset = 1;
  soffset = 1;
  len = 0;

  for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
    {
      if (dim == which)
        {
          roffset = GFC_DESCRIPTOR_STRIDE(ret,dim);
          if (roffset == 0)
            roffset = 1;
          soffset = GFC_DESCRIPTOR_STRIDE(array,dim);
          if (soffset == 0)
            soffset = 1;
          len = GFC_DESCRIPTOR_EXTENT(array,dim);
        }
      else
        {
          count[n] = 0;
          extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
          rstride[n] = GFC_DESCRIPTOR_STRIDE(ret,dim);
          sstride[n] = GFC_DESCRIPTOR_STRIDE(array,dim);
          hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
	  rs_ex[n] = rstride[n] * extent[n];
	  ss_ex[n] = sstride[n] * extent[n];
	  hs_ex[n] = hstride[n] * extent[n];
          n++;
        }
    }
  if (sstride[0] == 0)
    sstride[0] = 1;
  if (rstride[0] == 0)
    rstride[0] = 1;
  if (hstride[0] == 0)
    hstride[0] = 1;

  dim = GFC_DESCRIPTOR_RANK (array);
  rstride0 = rstride[0];
  sstride0 = sstride[0];
  hstride0 = hstride[0];
  rptr = ret->base_addr;
  sptr = array->base_addr;
  hptr = h->base_addr;

  while (rptr)
    {
      /* Do the shift for this dimension.  */
      sh = *hptr;
      /* Normal case should be -len < sh < len; try to
         avoid the expensive remainder operation if possible.  */
      if (sh < 0)
        sh += len;
      if (unlikely(sh >= len || sh < 0))
	{
 	  sh = sh % len;
	  if (sh < 0)
            sh += len;
	}
      src = &sptr[sh * soffset];
      dest = rptr;
      if (soffset == 1 && roffset == 1)
	{
	  size_t len1 = sh * sizeof (GFC_COMPLEX_16);
	  size_t len2 = (len - sh) * sizeof (GFC_COMPLEX_16);
	  memcpy (rptr, sptr + sh, len2);
	  memcpy (rptr + (len - sh), sptr, len1);
	}
      else
        {
	  for (n = 0; n < len - sh; n++)
	    {
	      *dest = *src;
	      dest += roffset;
	      src += soffset;
	    }
	  for (src = sptr, n = 0; n < sh; n++)
	    {
	      *dest = *src;
	      dest += roffset;
	      src += soffset;
	    }
	}

      /* Advance to the next section.  */
      rptr += rstride0;
      sptr += sstride0;
      hptr += hstride0;
      count[0]++;
      n = 0;
      while (count[n] == extent[n])
        {
          /* When we get to the end of a dimension, reset it and increment
             the next dimension.  */
          count[n] = 0;
          rptr -= rs_ex[n];
          sptr -= ss_ex[n];
	  hptr -= hs_ex[n];
          n++;
          if (n >= dim - 1)
            {
              /* Break out of the loop.  */
              rptr = NULL;
              break;
            }
          else
            {
              count[n]++;
              rptr += rstride[n];
              sptr += sstride[n];
	      hptr += hstride[n];
            }
        }
    }
}

#endif