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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [loop-init.c] - Blame information for rev 833

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1 684 jeremybenn
/* Loop optimizer initialization routines and RTL loop optimization passes.
2
   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010
3
   Free Software Foundation, Inc.
4
 
5
This file is part of GCC.
6
 
7
GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
9
Software Foundation; either version 3, or (at your option) any later
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version.
11
 
12
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
20
 
21
#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "hard-reg-set.h"
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#include "obstack.h"
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#include "basic-block.h"
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#include "cfgloop.h"
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#include "cfglayout.h"
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#include "tree-pass.h"
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#include "timevar.h"
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#include "flags.h"
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#include "df.h"
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#include "ggc.h"
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37
 
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/* Initialize loop structures.  This is used by the tree and RTL loop
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   optimizers.  FLAGS specify what properties to compute and/or ensure for
40
   loops.  */
41
 
42
void
43
loop_optimizer_init (unsigned flags)
44
{
45
  struct loops *loops;
46
 
47
  gcc_assert (!current_loops);
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  loops = ggc_alloc_cleared_loops ();
49
 
50
  /* Find the loops.  */
51
 
52
  flow_loops_find (loops);
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  current_loops = loops;
54
 
55
  if (flags & LOOPS_MAY_HAVE_MULTIPLE_LATCHES)
56
    {
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      /* If the loops may have multiple latches, we cannot canonicalize
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         them further (and most of the loop manipulation functions will
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         not work).  However, we avoid modifying cfg, which some
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         passes may want.  */
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      gcc_assert ((flags & ~(LOOPS_MAY_HAVE_MULTIPLE_LATCHES
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                             | LOOPS_HAVE_RECORDED_EXITS)) == 0);
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      loops_state_set (LOOPS_MAY_HAVE_MULTIPLE_LATCHES);
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    }
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  else
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    disambiguate_loops_with_multiple_latches ();
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68
  /* Create pre-headers.  */
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  if (flags & LOOPS_HAVE_PREHEADERS)
70
    {
71
      int cp_flags = CP_SIMPLE_PREHEADERS;
72
 
73
      if (flags & LOOPS_HAVE_FALLTHRU_PREHEADERS)
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        cp_flags |= CP_FALLTHRU_PREHEADERS;
75
 
76
      create_preheaders (cp_flags);
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    }
78
 
79
  /* Force all latches to have only single successor.  */
80
  if (flags & LOOPS_HAVE_SIMPLE_LATCHES)
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    force_single_succ_latches ();
82
 
83
  /* Mark irreducible loops.  */
84
  if (flags & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
85
    mark_irreducible_loops ();
86
 
87
  if (flags & LOOPS_HAVE_RECORDED_EXITS)
88
    record_loop_exits ();
89
 
90
  /* Dump loops.  */
91
  flow_loops_dump (dump_file, NULL, 1);
92
 
93
#ifdef ENABLE_CHECKING
94
  verify_dominators (CDI_DOMINATORS);
95
  verify_loop_structure ();
96
#endif
97
}
98
 
99
/* Finalize loop structures.  */
100
 
101
void
102
loop_optimizer_finalize (void)
103
{
104
  loop_iterator li;
105
  struct loop *loop;
106
  basic_block bb;
107
 
108
  gcc_assert (current_loops != NULL);
109
 
110
  FOR_EACH_LOOP (li, loop, 0)
111
    {
112
      free_simple_loop_desc (loop);
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    }
114
 
115
  /* Clean up.  */
116
  if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
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    release_recorded_exits ();
118
  flow_loops_free (current_loops);
119
  ggc_free (current_loops);
120
  current_loops = NULL;
121
 
122
  FOR_ALL_BB (bb)
123
    {
124
      bb->loop_father = NULL;
125
    }
126
}
127
 
128
 
129
/* Gate for the RTL loop superpass.  The actual passes are subpasses.
130
   See passes.c for more on that.  */
131
 
132
static bool
133
gate_handle_loop2 (void)
134
{
135
  return (optimize > 0
136
          && (flag_move_loop_invariants
137
              || flag_unswitch_loops
138
              || flag_peel_loops
139
              || flag_unroll_loops
140
#ifdef HAVE_doloop_end
141
              || (flag_branch_on_count_reg && HAVE_doloop_end)
142
#endif
143
              ));
144
}
145
 
146
struct rtl_opt_pass pass_loop2 =
147
{
148
 {
149
  RTL_PASS,
150
  "loop2",                              /* name */
151
  gate_handle_loop2,                    /* gate */
152
  NULL,                                 /* execute */
153
  NULL,                                 /* sub */
154
  NULL,                                 /* next */
155
  0,                                    /* static_pass_number */
156
  TV_LOOP,                              /* tv_id */
157
  0,                                    /* properties_required */
158
  0,                                    /* properties_provided */
159
  0,                                    /* properties_destroyed */
160
  0,                                    /* todo_flags_start */
161
  TODO_ggc_collect                      /* todo_flags_finish */
162
 }
163
};
164
 
165
 
166
/* Initialization of the RTL loop passes.  */
167
static unsigned int
168
rtl_loop_init (void)
169
{
170
  gcc_assert (current_ir_type () == IR_RTL_CFGLAYOUT);
171
 
172
  if (dump_file)
173
    dump_flow_info (dump_file, dump_flags);
174
 
175
  loop_optimizer_init (LOOPS_NORMAL);
176
  return 0;
177
}
178
 
179
struct rtl_opt_pass pass_rtl_loop_init =
180
{
181
 {
182
  RTL_PASS,
183
  "loop2_init",                           /* name */
184
  NULL,                                 /* gate */
185
  rtl_loop_init,                        /* execute */
186
  NULL,                                 /* sub */
187
  NULL,                                 /* next */
188
  0,                                    /* static_pass_number */
189
  TV_LOOP,                              /* tv_id */
190
  0,                                    /* properties_required */
191
  0,                                    /* properties_provided */
192
  0,                                    /* properties_destroyed */
193
  0,                                    /* todo_flags_start */
194
  TODO_verify_rtl_sharing               /* todo_flags_finish */
195
 }
196
};
197
 
198
 
199
/* Finalization of the RTL loop passes.  */
200
 
201
static unsigned int
202
rtl_loop_done (void)
203
{
204
  loop_optimizer_finalize ();
205
  free_dominance_info (CDI_DOMINATORS);
206
 
207
  cleanup_cfg (0);
208
  if (dump_file)
209
    dump_flow_info (dump_file, dump_flags);
210
 
211
  return 0;
212
}
213
 
214
struct rtl_opt_pass pass_rtl_loop_done =
215
{
216
 {
217
  RTL_PASS,
218
  "loop2_done",                          /* name */
219
  NULL,                                 /* gate */
220
  rtl_loop_done,                        /* execute */
221
  NULL,                                 /* sub */
222
  NULL,                                 /* next */
223
  0,                                    /* static_pass_number */
224
  TV_LOOP,                              /* tv_id */
225
  0,                                    /* properties_required */
226
  0,                                    /* properties_provided */
227
  0,                                    /* properties_destroyed */
228
  0,                                    /* todo_flags_start */
229
  TODO_verify_flow
230
    | TODO_verify_rtl_sharing           /* todo_flags_finish */
231
 }
232
};
233
 
234
 
235
/* Loop invariant code motion.  */
236
static bool
237
gate_rtl_move_loop_invariants (void)
238
{
239
  return flag_move_loop_invariants;
240
}
241
 
242
static unsigned int
243
rtl_move_loop_invariants (void)
244
{
245
  if (number_of_loops () > 1)
246
    move_loop_invariants ();
247
  return 0;
248
}
249
 
250
struct rtl_opt_pass pass_rtl_move_loop_invariants =
251
{
252
 {
253
  RTL_PASS,
254
  "loop2_invariant",                    /* name */
255
  gate_rtl_move_loop_invariants,        /* gate */
256
  rtl_move_loop_invariants,             /* execute */
257
  NULL,                                 /* sub */
258
  NULL,                                 /* next */
259
  0,                                    /* static_pass_number */
260
  TV_LOOP_MOVE_INVARIANTS,              /* tv_id */
261
  0,                                    /* properties_required */
262
  0,                                    /* properties_provided */
263
  0,                                    /* properties_destroyed */
264
  0,                                    /* todo_flags_start */
265
  TODO_df_verify |
266
  TODO_df_finish | TODO_verify_rtl_sharing  /* todo_flags_finish */
267
 }
268
};
269
 
270
 
271
/* Loop unswitching for RTL.  */
272
static bool
273
gate_rtl_unswitch (void)
274
{
275
  return flag_unswitch_loops;
276
}
277
 
278
static unsigned int
279
rtl_unswitch (void)
280
{
281
  if (number_of_loops () > 1)
282
    unswitch_loops ();
283
  return 0;
284
}
285
 
286
struct rtl_opt_pass pass_rtl_unswitch =
287
{
288
 {
289
  RTL_PASS,
290
  "loop2_unswitch",                      /* name */
291
  gate_rtl_unswitch,                    /* gate */
292
  rtl_unswitch,                         /* execute */
293
  NULL,                                 /* sub */
294
  NULL,                                 /* next */
295
  0,                                    /* static_pass_number */
296
  TV_LOOP_UNSWITCH,                     /* tv_id */
297
  0,                                    /* properties_required */
298
  0,                                    /* properties_provided */
299
  0,                                    /* properties_destroyed */
300
  0,                                    /* todo_flags_start */
301
  TODO_verify_rtl_sharing,              /* todo_flags_finish */
302
 }
303
};
304
 
305
 
306
/* Loop unswitching for RTL.  */
307
static bool
308
gate_rtl_unroll_and_peel_loops (void)
309
{
310
  return (flag_peel_loops || flag_unroll_loops || flag_unroll_all_loops);
311
}
312
 
313
static unsigned int
314
rtl_unroll_and_peel_loops (void)
315
{
316
  if (number_of_loops () > 1)
317
    {
318
      int flags = 0;
319
      if (dump_file)
320
        df_dump (dump_file);
321
 
322
      if (flag_peel_loops)
323
        flags |= UAP_PEEL;
324
      if (flag_unroll_loops)
325
        flags |= UAP_UNROLL;
326
      if (flag_unroll_all_loops)
327
        flags |= UAP_UNROLL_ALL;
328
 
329
      unroll_and_peel_loops (flags);
330
    }
331
  return 0;
332
}
333
 
334
struct rtl_opt_pass pass_rtl_unroll_and_peel_loops =
335
{
336
 {
337
  RTL_PASS,
338
  "loop2_unroll",                        /* name */
339
  gate_rtl_unroll_and_peel_loops,       /* gate */
340
  rtl_unroll_and_peel_loops,            /* execute */
341
  NULL,                                 /* sub */
342
  NULL,                                 /* next */
343
  0,                                    /* static_pass_number */
344
  TV_LOOP_UNROLL,                       /* tv_id */
345
  0,                                    /* properties_required */
346
  0,                                    /* properties_provided */
347
  0,                                    /* properties_destroyed */
348
  0,                                    /* todo_flags_start */
349
  TODO_verify_rtl_sharing,              /* todo_flags_finish */
350
 }
351
};
352
 
353
 
354
/* The doloop optimization.  */
355
static bool
356
gate_rtl_doloop (void)
357
{
358
#ifdef HAVE_doloop_end
359
  return (flag_branch_on_count_reg && HAVE_doloop_end);
360
#else
361
  return 0;
362
#endif
363
}
364
 
365
static unsigned int
366
rtl_doloop (void)
367
{
368
#ifdef HAVE_doloop_end
369
  if (number_of_loops () > 1)
370
    doloop_optimize_loops ();
371
#endif
372
  return 0;
373
}
374
 
375
struct rtl_opt_pass pass_rtl_doloop =
376
{
377
 {
378
  RTL_PASS,
379
  "loop2_doloop",                        /* name */
380
  gate_rtl_doloop,                      /* gate */
381
  rtl_doloop,                           /* execute */
382
  NULL,                                 /* sub */
383
  NULL,                                 /* next */
384
  0,                                    /* static_pass_number */
385
  TV_LOOP_DOLOOP,                       /* tv_id */
386
  0,                                    /* properties_required */
387
  0,                                    /* properties_provided */
388
  0,                                    /* properties_destroyed */
389
  0,                                    /* todo_flags_start */
390
  TODO_verify_rtl_sharing               /* todo_flags_finish */
391
 }
392
};

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