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/* Loop optimizer initialization routines and RTL loop optimization passes.
   Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
 
This file is part of GCC.
 
GCC 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, or (at your option) any later
version.
 
GCC 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.
 
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */
 
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "hard-reg-set.h"
#include "obstack.h"
#include "basic-block.h"
#include "cfgloop.h"
#include "cfglayout.h"
#include "tree-pass.h"
#include "timevar.h"
#include "flags.h"
 
 
/* Initialize loop optimizer.  This is used by the tree and RTL loop
   optimizers.  FLAGS specify what properties to compute and/or ensure for
   loops.  */
 
struct loops *
loop_optimizer_init (unsigned flags)
{
  struct loops *loops = XCNEW (struct loops);
  edge e;
  edge_iterator ei;
  static bool first_time = true;
 
  if (first_time)
    {
      first_time = false;
      init_set_costs ();
    }
 
  /* Avoid annoying special cases of edges going to exit
     block.  */
 
  for (ei = ei_start (EXIT_BLOCK_PTR->preds); (e = ei_safe_edge (ei)); )
    if ((e->flags & EDGE_FALLTHRU) && !single_succ_p (e->src))
      split_edge (e);
    else
      ei_next (&ei);
 
  /* Find the loops.  */
 
  if (flow_loops_find (loops) <= 1)
    {
      /* No loops.  */
      flow_loops_free (loops);
      free (loops);
 
      return NULL;
    }
 
  /* Not going to update these.  */
  free (loops->cfg.rc_order);
  loops->cfg.rc_order = NULL;
  free (loops->cfg.dfs_order);
  loops->cfg.dfs_order = NULL;
 
  /* Create pre-headers.  */
  if (flags & LOOPS_HAVE_PREHEADERS)
    create_preheaders (loops, CP_SIMPLE_PREHEADERS);
 
  /* Force all latches to have only single successor.  */
  if (flags & LOOPS_HAVE_SIMPLE_LATCHES)
    force_single_succ_latches (loops);
 
  /* Mark irreducible loops.  */
  if (flags & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
    mark_irreducible_loops (loops);
 
  if (flags & LOOPS_HAVE_MARKED_SINGLE_EXITS)
    mark_single_exit_loops (loops);
 
  /* Dump loops.  */
  flow_loops_dump (loops, dump_file, NULL, 1);
 
#ifdef ENABLE_CHECKING
  verify_dominators (CDI_DOMINATORS);
  verify_loop_structure (loops);
#endif
 
  return loops;
}
 
/* Finalize loop optimizer.  */
void
loop_optimizer_finalize (struct loops *loops)
{
  unsigned i;
 
  if (!loops)
    return;
 
  for (i = 1; i < loops->num; i++)
    if (loops->parray[i])
      free_simple_loop_desc (loops->parray[i]);
 
  /* Clean up.  */
  flow_loops_free (loops);
  free (loops);
 
  /* Checking.  */
#ifdef ENABLE_CHECKING
  verify_flow_info ();
#endif
}
 
 
/* Gate for the RTL loop superpass.  The actual passes are subpasses.
   See passes.c for more on that.  */
 
static bool
gate_handle_loop2 (void)
{
  return (optimize > 0
          && (flag_move_loop_invariants
              || flag_unswitch_loops
              || flag_peel_loops
              || flag_unroll_loops
#ifdef HAVE_doloop_end
              || (flag_branch_on_count_reg && HAVE_doloop_end)
#endif
              ));
}
 
struct tree_opt_pass pass_loop2 =
{
  "loop2",                              /* name */
  gate_handle_loop2,                    /* gate */
  NULL,                                 /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func |
  TODO_ggc_collect,                     /* todo_flags_finish */
  'L'                                   /* letter */
};
 
 
/* Initialization of the RTL loop passes.  */
static unsigned int
rtl_loop_init (void)
{
  if (dump_file)
    dump_flow_info (dump_file, dump_flags);
 
  /* Initialize structures for layout changes.  */
  cfg_layout_initialize (0);
 
  current_loops = loop_optimizer_init (LOOPS_NORMAL);
  return 0;
}
 
struct tree_opt_pass pass_rtl_loop_init =
{
  "loop2_init",                           /* name */
  NULL,                                 /* gate */
  rtl_loop_init,                        /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
  'L'                                   /* letter */
};
 
 
/* Finalization of the RTL loop passes.  */
static unsigned int
rtl_loop_done (void)
{
  basic_block bb;
 
  if (current_loops)
    loop_optimizer_finalize (current_loops);
 
  free_dominance_info (CDI_DOMINATORS);
 
  /* Finalize layout changes.  */
  FOR_EACH_BB (bb)
    if (bb->next_bb != EXIT_BLOCK_PTR)
      bb->aux = bb->next_bb;
  cfg_layout_finalize ();
 
  cleanup_cfg (CLEANUP_EXPENSIVE);
  delete_trivially_dead_insns (get_insns (), max_reg_num ());
  reg_scan (get_insns (), max_reg_num ());
  if (dump_file)
    dump_flow_info (dump_file, dump_flags);
 
  current_loops = NULL;
  return 0;
}
 
struct tree_opt_pass pass_rtl_loop_done =
{
  "loop2_done",                          /* name */
  NULL,                                 /* gate */
  rtl_loop_done,                        /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
  'L'                                   /* letter */
};
 
 
/* Loop invariant code motion.  */
static bool
gate_rtl_move_loop_invariants (void)
{
  return flag_move_loop_invariants;
}
 
static unsigned int
rtl_move_loop_invariants (void)
{
  if (current_loops)
    move_loop_invariants (current_loops);
  return 0;
}
 
struct tree_opt_pass pass_rtl_move_loop_invariants =
{
  "loop2_invariant",                     /* name */
  gate_rtl_move_loop_invariants,        /* gate */
  rtl_move_loop_invariants,             /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
  'L'                                   /* letter */
};
 
 
/* Loop unswitching for RTL.  */
static bool
gate_rtl_unswitch (void)
{
  return flag_unswitch_loops;
}
 
static unsigned int
rtl_unswitch (void)
{
  if (current_loops)
    unswitch_loops (current_loops);
  return 0;
}
 
struct tree_opt_pass pass_rtl_unswitch =
{
  "loop2_unswitch",                      /* name */
  gate_rtl_unswitch,                    /* gate */
  rtl_unswitch,                         /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
  'L'                                   /* letter */
};
 
 
/* Loop unswitching for RTL.  */
static bool
gate_rtl_unroll_and_peel_loops (void)
{
  return (flag_peel_loops || flag_unroll_loops || flag_unroll_all_loops);
}
 
static unsigned int
rtl_unroll_and_peel_loops (void)
{
  if (current_loops)
    {
      int flags = 0;
 
      if (flag_peel_loops)
        flags |= UAP_PEEL;
      if (flag_unroll_loops)
        flags |= UAP_UNROLL;
      if (flag_unroll_all_loops)
        flags |= UAP_UNROLL_ALL;
 
      unroll_and_peel_loops (current_loops, flags);
    }
  return 0;
}
 
struct tree_opt_pass pass_rtl_unroll_and_peel_loops =
{
  "loop2_unroll",                        /* name */
  gate_rtl_unroll_and_peel_loops,       /* gate */
  rtl_unroll_and_peel_loops,            /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
  'L'                                   /* letter */
};
 
 
/* The doloop optimization.  */
static bool
gate_rtl_doloop (void)
{
#ifdef HAVE_doloop_end
  return (flag_branch_on_count_reg && HAVE_doloop_end);
#else
  return 0;
#endif
}
 
static unsigned int
rtl_doloop (void)
{
#ifdef HAVE_doloop_end
  if (current_loops)
    doloop_optimize_loops (current_loops);
#endif
  return 0;
}
 
struct tree_opt_pass pass_rtl_doloop =
{
  "loop2_doloop",                        /* name */
  gate_rtl_doloop,                      /* gate */
  rtl_doloop,                           /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP,                              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
  'L'                                   /* letter */
};
 

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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [loop-init.c] - Blame information for rev 452

Line No.	Rev	Author	Line
1	38	julius	`/* Loop optimizer initialization routines and RTL loop optimization passes.`
2			`Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.`
3
4			`This file is part of GCC.`
5
6			`GCC is free software; you can redistribute it and/or modify it under`
7			`the terms of the GNU General Public License as published by the Free`
8			`Software Foundation; either version 3, or (at your option) any later`
9			`version.`
10
11			`GCC is distributed in the hope that it will be useful, but WITHOUT ANY`
12			`WARRANTY; without even the implied warranty of MERCHANTABILITY or`
13			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
14			`for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with GCC; see the file COPYING3. If not see`
18			`<http://www.gnu.org/licenses/>. */`
19
20			`#include "config.h"`
21			`#include "system.h"`
22			`#include "coretypes.h"`
23			`#include "tm.h"`
24			`#include "rtl.h"`
25			`#include "hard-reg-set.h"`
26			`#include "obstack.h"`
27			`#include "basic-block.h"`
28			`#include "cfgloop.h"`
29			`#include "cfglayout.h"`
30			`#include "tree-pass.h"`
31			`#include "timevar.h"`
32			`#include "flags.h"`
33
34
35			`/* Initialize loop optimizer. This is used by the tree and RTL loop`
36			`optimizers. FLAGS specify what properties to compute and/or ensure for`
37			`loops. */`
38
39			`struct loops *`
40			`loop_optimizer_init (unsigned flags)`
41			`{`
42			`struct loops *loops = XCNEW (struct loops);`
43			`edge e;`
44			`edge_iterator ei;`
45			`static bool first_time = true;`
46
47			`if (first_time)`
48			`{`
49			`first_time = false;`
50			`init_set_costs ();`
51			`}`
52
53			`/* Avoid annoying special cases of edges going to exit`
54			`block. */`
55
56			`for (ei = ei_start (EXIT_BLOCK_PTR->preds); (e = ei_safe_edge (ei)); )`
57			`if ((e->flags & EDGE_FALLTHRU) && !single_succ_p (e->src))`
58			`split_edge (e);`
59			`else`
60			`ei_next (&ei);`
61
62			`/* Find the loops. */`
63
64			`if (flow_loops_find (loops) <= 1)`
65			`{`
66			`/* No loops. */`
67			`flow_loops_free (loops);`
68			`free (loops);`
69
70			`return NULL;`
71			`}`
72
73			`/* Not going to update these. */`
74			`free (loops->cfg.rc_order);`
75			`loops->cfg.rc_order = NULL;`
76			`free (loops->cfg.dfs_order);`
77			`loops->cfg.dfs_order = NULL;`
78
79			`/* Create pre-headers. */`
80			`if (flags & LOOPS_HAVE_PREHEADERS)`
81			`create_preheaders (loops, CP_SIMPLE_PREHEADERS);`
82
83			`/* Force all latches to have only single successor. */`
84			`if (flags & LOOPS_HAVE_SIMPLE_LATCHES)`
85			`force_single_succ_latches (loops);`
86
87			`/* Mark irreducible loops. */`
88			`if (flags & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)`
89			`mark_irreducible_loops (loops);`
90
91			`if (flags & LOOPS_HAVE_MARKED_SINGLE_EXITS)`
92			`mark_single_exit_loops (loops);`
93
94			`/* Dump loops. */`
95			`flow_loops_dump (loops, dump_file, NULL, 1);`
96
97			`#ifdef ENABLE_CHECKING`
98			`verify_dominators (CDI_DOMINATORS);`
99			`verify_loop_structure (loops);`
100			`#endif`
101
102			`return loops;`
103			`}`
104
105			`/* Finalize loop optimizer. */`
106			`void`
107			`loop_optimizer_finalize (struct loops *loops)`
108			`{`
109			`unsigned i;`
110
111			`if (!loops)`
112			`return;`
113
114			`for (i = 1; i < loops->num; i++)`
115			`if (loops->parray[i])`
116			`free_simple_loop_desc (loops->parray[i]);`
117
118			`/* Clean up. */`
119			`flow_loops_free (loops);`
120			`free (loops);`
121
122			`/* Checking. */`
123			`#ifdef ENABLE_CHECKING`
124			`verify_flow_info ();`
125			`#endif`
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 tree_opt_pass pass_loop2 =`
147			`{`
148			`"loop2", /* name */`
149			`gate_handle_loop2, /* gate */`
150			`NULL, /* execute */`
151			`NULL, /* sub */`
152			`NULL, /* next */`
153			`0, /* static_pass_number */`
154			`TV_LOOP, /* tv_id */`
155			`0, /* properties_required */`
156			`0, /* properties_provided */`
157			`0, /* properties_destroyed */`
158			`0, /* todo_flags_start */`
159			`TODO_dump_func \|`
160			`TODO_ggc_collect, /* todo_flags_finish */`
161			`'L' /* letter */`
162			`};`
163
164
165			`/* Initialization of the RTL loop passes. */`
166			`static unsigned int`
167			`rtl_loop_init (void)`
168			`{`
169			`if (dump_file)`
170			`dump_flow_info (dump_file, dump_flags);`
171
172			`/* Initialize structures for layout changes. */`
173			`cfg_layout_initialize (0);`
174
175			`current_loops = loop_optimizer_init (LOOPS_NORMAL);`
176			`return 0;`
177			`}`
178
179			`struct tree_opt_pass pass_rtl_loop_init =`
180			`{`
181			`"loop2_init", /* name */`
182			`NULL, /* gate */`
183			`rtl_loop_init, /* execute */`
184			`NULL, /* sub */`
185			`NULL, /* next */`
186			`0, /* static_pass_number */`
187			`TV_LOOP, /* tv_id */`
188			`0, /* properties_required */`
189			`0, /* properties_provided */`
190			`0, /* properties_destroyed */`
191			`0, /* todo_flags_start */`
192			`TODO_dump_func, /* todo_flags_finish */`
193			`'L' /* letter */`
194			`};`
195
196
197			`/* Finalization of the RTL loop passes. */`
198			`static unsigned int`
199			`rtl_loop_done (void)`
200			`{`
201			`basic_block bb;`
202
203			`if (current_loops)`
204			`loop_optimizer_finalize (current_loops);`
205
206			`free_dominance_info (CDI_DOMINATORS);`
207
208			`/* Finalize layout changes. */`
209			`FOR_EACH_BB (bb)`
210			`if (bb->next_bb != EXIT_BLOCK_PTR)`
211			`bb->aux = bb->next_bb;`
212			`cfg_layout_finalize ();`
213
214			`cleanup_cfg (CLEANUP_EXPENSIVE);`
215			`delete_trivially_dead_insns (get_insns (), max_reg_num ());`
216			`reg_scan (get_insns (), max_reg_num ());`
217			`if (dump_file)`
218			`dump_flow_info (dump_file, dump_flags);`
219
220			`current_loops = NULL;`
221			`return 0;`
222			`}`
223
224			`struct tree_opt_pass pass_rtl_loop_done =`
225			`{`
226			`"loop2_done", /* name */`
227			`NULL, /* gate */`
228			`rtl_loop_done, /* execute */`
229			`NULL, /* sub */`
230			`NULL, /* next */`
231			`0, /* static_pass_number */`
232			`TV_LOOP, /* tv_id */`
233			`0, /* properties_required */`
234			`0, /* properties_provided */`
235			`0, /* properties_destroyed */`
236			`0, /* todo_flags_start */`
237			`TODO_dump_func, /* todo_flags_finish */`
238			`'L' /* letter */`
239			`};`
240
241
242			`/* Loop invariant code motion. */`
243			`static bool`
244			`gate_rtl_move_loop_invariants (void)`
245			`{`
246			`return flag_move_loop_invariants;`
247			`}`
248
249			`static unsigned int`
250			`rtl_move_loop_invariants (void)`
251			`{`
252			`if (current_loops)`
253			`move_loop_invariants (current_loops);`
254			`return 0;`
255			`}`
256
257			`struct tree_opt_pass pass_rtl_move_loop_invariants =`
258			`{`
259			`"loop2_invariant", /* name */`
260			`gate_rtl_move_loop_invariants, /* gate */`
261			`rtl_move_loop_invariants, /* execute */`
262			`NULL, /* sub */`
263			`NULL, /* next */`
264			`0, /* static_pass_number */`
265			`TV_LOOP, /* tv_id */`
266			`0, /* properties_required */`
267			`0, /* properties_provided */`
268			`0, /* properties_destroyed */`
269			`0, /* todo_flags_start */`
270			`TODO_dump_func, /* todo_flags_finish */`
271			`'L' /* letter */`
272			`};`
273
274
275			`/* Loop unswitching for RTL. */`
276			`static bool`
277			`gate_rtl_unswitch (void)`
278			`{`
279			`return flag_unswitch_loops;`
280			`}`
281
282			`static unsigned int`
283			`rtl_unswitch (void)`
284			`{`
285			`if (current_loops)`
286			`unswitch_loops (current_loops);`
287			`return 0;`
288			`}`
289
290			`struct tree_opt_pass pass_rtl_unswitch =`
291			`{`
292			`"loop2_unswitch", /* name */`
293			`gate_rtl_unswitch, /* gate */`
294			`rtl_unswitch, /* execute */`
295			`NULL, /* sub */`
296			`NULL, /* next */`
297			`0, /* static_pass_number */`
298			`TV_LOOP, /* tv_id */`
299			`0, /* properties_required */`
300			`0, /* properties_provided */`
301			`0, /* properties_destroyed */`
302			`0, /* todo_flags_start */`
303			`TODO_dump_func, /* todo_flags_finish */`
304			`'L' /* letter */`
305			`};`
306
307
308			`/* Loop unswitching for RTL. */`
309			`static bool`
310			`gate_rtl_unroll_and_peel_loops (void)`
311			`{`
312			`return (flag_peel_loops \|\| flag_unroll_loops \|\| flag_unroll_all_loops);`
313			`}`
314
315			`static unsigned int`
316			`rtl_unroll_and_peel_loops (void)`
317			`{`
318			`if (current_loops)`
319			`{`
320			`int flags = 0;`
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 (current_loops, flags);`
330			`}`
331			`return 0;`
332			`}`
333
334			`struct tree_opt_pass pass_rtl_unroll_and_peel_loops =`
335			`{`
336			`"loop2_unroll", /* name */`
337			`gate_rtl_unroll_and_peel_loops, /* gate */`
338			`rtl_unroll_and_peel_loops, /* execute */`
339			`NULL, /* sub */`
340			`NULL, /* next */`
341			`0, /* static_pass_number */`
342			`TV_LOOP, /* tv_id */`
343			`0, /* properties_required */`
344			`0, /* properties_provided */`
345			`0, /* properties_destroyed */`
346			`0, /* todo_flags_start */`
347			`TODO_dump_func, /* todo_flags_finish */`
348			`'L' /* letter */`
349			`};`
350
351
352			`/* The doloop optimization. */`
353			`static bool`
354			`gate_rtl_doloop (void)`
355			`{`
356			`#ifdef HAVE_doloop_end`
357			`return (flag_branch_on_count_reg && HAVE_doloop_end);`
358			`#else`
359			`return 0;`
360			`#endif`
361			`}`
362
363			`static unsigned int`
364			`rtl_doloop (void)`
365			`{`
366			`#ifdef HAVE_doloop_end`
367			`if (current_loops)`
368			`doloop_optimize_loops (current_loops);`
369			`#endif`
370			`return 0;`
371			`}`
372
373			`struct tree_opt_pass pass_rtl_doloop =`
374			`{`
375			`"loop2_doloop", /* name */`
376			`gate_rtl_doloop, /* gate */`
377			`rtl_doloop, /* execute */`
378			`NULL, /* sub */`
379			`NULL, /* next */`
380			`0, /* static_pass_number */`
381			`TV_LOOP, /* tv_id */`
382			`0, /* properties_required */`
383			`0, /* properties_provided */`
384			`0, /* properties_destroyed */`
385			`0, /* todo_flags_start */`
386			`TODO_dump_func, /* todo_flags_finish */`
387			`'L' /* letter */`
388			`};`
389