1 /* Generic implementation of the CSHIFT intrinsic
2 Copyright 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
3 Contributed by Feng Wang <wf_cs@yahoo.com>
5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
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.
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
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.
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. */
31 #include "libgfortran.h"
37 /* "Templatized" helper function for the inner shift loop. */
39 #define DEF_COPY_LOOP(NAME, TYPE) \
41 copy_loop_##NAME (void *xdest, const void *xsrc, \
42 size_t roff, size_t soff, \
43 index_type len, index_type shift) \
49 roff /= sizeof (TYPE); \
50 soff /= sizeof (TYPE); \
53 src += shift * soff; \
54 for (i = 0; i < len - shift; ++i) \
62 for (i = 0; i < shift; ++i) \
70 DEF_COPY_LOOP(int, int)
71 DEF_COPY_LOOP(long, long)
72 DEF_COPY_LOOP(double, double)
73 DEF_COPY_LOOP(ldouble
, long double)
74 DEF_COPY_LOOP(cfloat
, _Complex
float)
75 DEF_COPY_LOOP(cdouble
, _Complex
double)
79 cshift0 (gfc_array_char
* ret
, const gfc_array_char
* array
,
80 ssize_t shift
, int which
, index_type size
)
82 /* r.* indicates the return array. */
83 index_type rstride
[GFC_MAX_DIMENSIONS
];
88 /* s.* indicates the source array. */
89 index_type sstride
[GFC_MAX_DIMENSIONS
];
94 index_type count
[GFC_MAX_DIMENSIONS
];
95 index_type extent
[GFC_MAX_DIMENSIONS
];
101 if (which
< 1 || which
> GFC_DESCRIPTOR_RANK (array
))
102 runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
112 /* The values assigned here must match the cases in the inner loop. */
114 switch (GFC_DESCRIPTOR_TYPE (array
))
116 case GFC_DTYPE_LOGICAL
:
117 case GFC_DTYPE_INTEGER
:
119 if (size
== sizeof (int))
121 else if (size
== sizeof (long))
123 else if (size
== sizeof (double))
125 else if (size
== sizeof (long double))
129 case GFC_DTYPE_COMPLEX
:
130 if (size
== sizeof (_Complex
float))
132 else if (size
== sizeof (_Complex
double))
140 /* Initialized for avoiding compiler warnings. */
145 if (ret
->data
== NULL
)
148 index_type arraysize
= size0 ((array_t
*)array
);
151 ret
->dtype
= array
->dtype
;
152 for (i
= 0; i
< GFC_DESCRIPTOR_RANK (array
); i
++)
154 ret
->dim
[i
].lbound
= 0;
155 ret
->dim
[i
].ubound
= array
->dim
[i
].ubound
- array
->dim
[i
].lbound
;
158 ret
->dim
[i
].stride
= 1;
160 ret
->dim
[i
].stride
= (ret
->dim
[i
-1].ubound
+ 1)
161 * ret
->dim
[i
-1].stride
;
165 ret
->data
= internal_malloc_size (size
* arraysize
);
168 ret
->data
= internal_malloc_size (1);
173 for (dim
= 0; dim
< GFC_DESCRIPTOR_RANK (array
); dim
++)
177 roffset
= ret
->dim
[dim
].stride
* size
;
180 soffset
= array
->dim
[dim
].stride
* size
;
183 len
= array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
188 extent
[n
] = array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
189 rstride
[n
] = ret
->dim
[dim
].stride
* size
;
190 sstride
[n
] = array
->dim
[dim
].stride
* size
;
199 dim
= GFC_DESCRIPTOR_RANK (array
);
200 rstride0
= rstride
[0];
201 sstride0
= sstride
[0];
205 shift
= shift
% (ssize_t
)len
;
211 /* Do the shift for this dimension. */
213 /* If elements are contiguous, perform the operation
214 in two block moves. */
215 if (soffset
== size
&& roffset
== size
)
217 size_t len1
= shift
* size
;
218 size_t len2
= (len
- shift
) * size
;
219 memcpy (rptr
, sptr
+ len1
, len2
);
220 memcpy (rptr
+ len2
, sptr
, len1
);
224 /* Otherwise, we'll have to perform the copy one element at
225 a time. We can speed this up a tad for common cases of
226 fundamental types. */
232 const char *src
= &sptr
[shift
* soffset
];
234 for (n
= 0; n
< len
- shift
; n
++)
236 memcpy (dest
, src
, size
);
240 for (src
= sptr
, n
= 0; n
< shift
; n
++)
242 memcpy (dest
, src
, size
);
250 copy_loop_int (rptr
, sptr
, roffset
, soffset
, len
, shift
);
254 copy_loop_long (rptr
, sptr
, roffset
, soffset
, len
, shift
);
258 copy_loop_double (rptr
, sptr
, roffset
, soffset
, len
, shift
);
262 copy_loop_ldouble (rptr
, sptr
, roffset
, soffset
, len
, shift
);
266 copy_loop_cfloat (rptr
, sptr
, roffset
, soffset
, len
, shift
);
270 copy_loop_cdouble (rptr
, sptr
, roffset
, soffset
, len
, shift
);
278 /* Advance to the next section. */
283 while (count
[n
] == extent
[n
])
285 /* When we get to the end of a dimension, reset it and increment
286 the next dimension. */
288 /* We could precalculate these products, but this is a less
289 frequently used path so probably not worth it. */
290 rptr
-= rstride
[n
] * extent
[n
];
291 sptr
-= sstride
[n
] * extent
[n
];
295 /* Break out of the loop. */
309 #define DEFINE_CSHIFT(N) \
310 extern void cshift0_##N (gfc_array_char *, const gfc_array_char *, \
311 const GFC_INTEGER_##N *, const GFC_INTEGER_##N *); \
312 export_proto(cshift0_##N); \
315 cshift0_##N (gfc_array_char *ret, const gfc_array_char *array, \
316 const GFC_INTEGER_##N *pshift, const GFC_INTEGER_##N *pdim) \
318 cshift0 (ret, array, *pshift, pdim ? *pdim : 1, \
319 GFC_DESCRIPTOR_SIZE (array)); \
322 extern void cshift0_##N##_char (gfc_array_char *, GFC_INTEGER_4, \
323 const gfc_array_char *, \
324 const GFC_INTEGER_##N *, \
325 const GFC_INTEGER_##N *, GFC_INTEGER_4); \
326 export_proto(cshift0_##N##_char); \
329 cshift0_##N##_char (gfc_array_char *ret, \
330 GFC_INTEGER_4 ret_length __attribute__((unused)), \
331 const gfc_array_char *array, \
332 const GFC_INTEGER_##N *pshift, \
333 const GFC_INTEGER_##N *pdim, \
334 GFC_INTEGER_4 array_length) \
336 cshift0 (ret, array, *pshift, pdim ? *pdim : 1, array_length); \