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/* Loop optimizer initialization routines and RTL loop optimization passes.
   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010
   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"
#include "df.h"
#include "ggc.h"
 
 
/* Initialize loop structures.  This is used by the tree and RTL loop
   optimizers.  FLAGS specify what properties to compute and/or ensure for
   loops.  */
 
void
loop_optimizer_init (unsigned flags)
{
  struct loops *loops;
 
  gcc_assert (!current_loops);
  loops = ggc_alloc_cleared_loops ();
 
  /* Find the loops.  */
 
  flow_loops_find (loops);
  current_loops = loops;
 
  if (flags & LOOPS_MAY_HAVE_MULTIPLE_LATCHES)
    {
      /* If the loops may have multiple latches, we cannot canonicalize
         them further (and most of the loop manipulation functions will
         not work).  However, we avoid modifying cfg, which some
         passes may want.  */
      gcc_assert ((flags & ~(LOOPS_MAY_HAVE_MULTIPLE_LATCHES
                             | LOOPS_HAVE_RECORDED_EXITS)) == 0);
      loops_state_set (LOOPS_MAY_HAVE_MULTIPLE_LATCHES);
    }
  else
    disambiguate_loops_with_multiple_latches ();
 
  /* Create pre-headers.  */
  if (flags & LOOPS_HAVE_PREHEADERS)
    {
      int cp_flags = CP_SIMPLE_PREHEADERS;
 
      if (flags & LOOPS_HAVE_FALLTHRU_PREHEADERS)
        cp_flags |= CP_FALLTHRU_PREHEADERS;
 
      create_preheaders (cp_flags);
    }
 
  /* Force all latches to have only single successor.  */
  if (flags & LOOPS_HAVE_SIMPLE_LATCHES)
    force_single_succ_latches ();
 
  /* Mark irreducible loops.  */
  if (flags & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
    mark_irreducible_loops ();
 
  if (flags & LOOPS_HAVE_RECORDED_EXITS)
    record_loop_exits ();
 
  /* Dump loops.  */
  flow_loops_dump (dump_file, NULL, 1);
 
#ifdef ENABLE_CHECKING
  verify_dominators (CDI_DOMINATORS);
  verify_loop_structure ();
#endif
}
 
/* Finalize loop structures.  */
 
void
loop_optimizer_finalize (void)
{
  loop_iterator li;
  struct loop *loop;
  basic_block bb;
 
  gcc_assert (current_loops != NULL);
 
  FOR_EACH_LOOP (li, loop, 0)
    {
      free_simple_loop_desc (loop);
    }
 
  /* Clean up.  */
  if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
    release_recorded_exits ();
  flow_loops_free (current_loops);
  ggc_free (current_loops);
  current_loops = NULL;
 
  FOR_ALL_BB (bb)
    {
      bb->loop_father = NULL;
    }
}
 
 
/* 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 rtl_opt_pass pass_loop2 =
{
 {
  RTL_PASS,
  "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_ggc_collect                      /* todo_flags_finish */
 }
};
 
 
/* Initialization of the RTL loop passes.  */
static unsigned int
rtl_loop_init (void)
{
  gcc_assert (current_ir_type () == IR_RTL_CFGLAYOUT);
 
  if (dump_file)
    dump_flow_info (dump_file, dump_flags);
 
  loop_optimizer_init (LOOPS_NORMAL);
  return 0;
}
 
struct rtl_opt_pass pass_rtl_loop_init =
{
 {
  RTL_PASS,
  "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_verify_rtl_sharing               /* todo_flags_finish */
 }
};
 
 
/* Finalization of the RTL loop passes.  */
 
static unsigned int
rtl_loop_done (void)
{
  loop_optimizer_finalize ();
  free_dominance_info (CDI_DOMINATORS);
 
  cleanup_cfg (0);
  if (dump_file)
    dump_flow_info (dump_file, dump_flags);
 
  return 0;
}
 
struct rtl_opt_pass pass_rtl_loop_done =
{
 {
  RTL_PASS,
  "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_verify_flow
    | TODO_verify_rtl_sharing           /* todo_flags_finish */
 }
};
 
 
/* 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 (number_of_loops () > 1)
    move_loop_invariants ();
  return 0;
}
 
struct rtl_opt_pass pass_rtl_move_loop_invariants =
{
 {
  RTL_PASS,
  "loop2_invariant",                    /* name */
  gate_rtl_move_loop_invariants,        /* gate */
  rtl_move_loop_invariants,             /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP_MOVE_INVARIANTS,              /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_df_verify |
  TODO_df_finish | TODO_verify_rtl_sharing  /* todo_flags_finish */
 }
};
 
 
/* Loop unswitching for RTL.  */
static bool
gate_rtl_unswitch (void)
{
  return flag_unswitch_loops;
}
 
static unsigned int
rtl_unswitch (void)
{
  if (number_of_loops () > 1)
    unswitch_loops ();
  return 0;
}
 
struct rtl_opt_pass pass_rtl_unswitch =
{
 {
  RTL_PASS,
  "loop2_unswitch",                      /* name */
  gate_rtl_unswitch,                    /* gate */
  rtl_unswitch,                         /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP_UNSWITCH,                     /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_verify_rtl_sharing,              /* todo_flags_finish */
 }
};
 
 
/* 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 (number_of_loops () > 1)
    {
      int flags = 0;
      if (dump_file)
        df_dump (dump_file);
 
      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 (flags);
    }
  return 0;
}
 
struct rtl_opt_pass pass_rtl_unroll_and_peel_loops =
{
 {
  RTL_PASS,
  "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_UNROLL,                       /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_verify_rtl_sharing,              /* todo_flags_finish */
 }
};
 
 
/* 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 (number_of_loops () > 1)
    doloop_optimize_loops ();
#endif
  return 0;
}
 
struct rtl_opt_pass pass_rtl_doloop =
{
 {
  RTL_PASS,
  "loop2_doloop",                        /* name */
  gate_rtl_doloop,                      /* gate */
  rtl_doloop,                           /* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_LOOP_DOLOOP,                       /* tv_id */
  0,                                    /* properties_required */
  0,                                    /* properties_provided */
  0,                                    /* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_verify_rtl_sharing               /* todo_flags_finish */
 }
};

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [loop-init.c] - Blame information for rev 749

Line No.	Rev	Author	Line
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`
8			`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`
10			`version.`
11
12			`GCC is distributed in the hope that it will be useful, but WITHOUT ANY`
13			`WARRANTY; without even the implied warranty of MERCHANTABILITY or`
14			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
15			`for more details.`
16
17			`You should have received a copy of the GNU General Public License`
18			`along with GCC; see the file COPYING3. If not see`
19			`<http://www.gnu.org/licenses/>. */`
20
21			`#include "config.h"`
22			`#include "system.h"`
23			`#include "coretypes.h"`
24			`#include "tm.h"`
25			`#include "rtl.h"`
26			`#include "hard-reg-set.h"`
27			`#include "obstack.h"`
28			`#include "basic-block.h"`
29			`#include "cfgloop.h"`
30			`#include "cfglayout.h"`
31			`#include "tree-pass.h"`
32			`#include "timevar.h"`
33			`#include "flags.h"`
34			`#include "df.h"`
35			`#include "ggc.h"`
36
37
38			`/* Initialize loop structures. This is used by the tree and RTL loop`
39			`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);`
48			`loops = ggc_alloc_cleared_loops ();`
49
50			`/* Find the loops. */`
51
52			`flow_loops_find (loops);`
53			`current_loops = loops;`
54
55			`if (flags & LOOPS_MAY_HAVE_MULTIPLE_LATCHES)`
56			`{`
57			`/* If the loops may have multiple latches, we cannot canonicalize`
58			`them further (and most of the loop manipulation functions will`
59			`not work). However, we avoid modifying cfg, which some`
60			`passes may want. */`
61			`gcc_assert ((flags & ~(LOOPS_MAY_HAVE_MULTIPLE_LATCHES`
62			`\| LOOPS_HAVE_RECORDED_EXITS)) == 0);`
63			`loops_state_set (LOOPS_MAY_HAVE_MULTIPLE_LATCHES);`
64			`}`
65			`else`
66			`disambiguate_loops_with_multiple_latches ();`
67
68			`/* Create pre-headers. */`
69			`if (flags & LOOPS_HAVE_PREHEADERS)`
70			`{`
71			`int cp_flags = CP_SIMPLE_PREHEADERS;`
72
73			`if (flags & LOOPS_HAVE_FALLTHRU_PREHEADERS)`
74			`cp_flags \|= CP_FALLTHRU_PREHEADERS;`
75
76			`create_preheaders (cp_flags);`
77			`}`
78
79			`/* Force all latches to have only single successor. */`
80			`if (flags & LOOPS_HAVE_SIMPLE_LATCHES)`
81			`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);`
113			`}`
114
115			`/* Clean up. */`
116			`if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))`
117			`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			`};`