Test lower_perm_opt like an enum, not a bitset.
[libfirm] / ir / be / bechordal_main.c
1 /*
2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
3  *
4  * This file is part of libFirm.
5  *
6  * This file may be distributed and/or modified under the terms of the
7  * GNU General Public License version 2 as published by the Free Software
8  * Foundation and appearing in the file LICENSE.GPL included in the
9  * packaging of this file.
10  *
11  * Licensees holding valid libFirm Professional Edition licenses may use
12  * this file in accordance with the libFirm Commercial License.
13  * Agreement provided with the Software.
14  *
15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17  * PURPOSE.
18  */
19
20 /**
21  * @file
22  * @brief       Driver for the chordal register allocator.
23  * @author      Sebastian Hack
24  * @date        29.11.2005
25  * @version     $Id$
26  */
27 #include "config.h"
28
29 #include <stdlib.h>
30 #include <time.h>
31
32 #include "obst.h"
33 #include "pset.h"
34 #include "list.h"
35 #include "bitset.h"
36 #include "iterator.h"
37
38 #include "lc_opts.h"
39 #include "lc_opts_enum.h"
40
41 #include "ircons_t.h"
42 #include "irmode_t.h"
43 #include "irgraph_t.h"
44 #include "irprintf_t.h"
45 #include "irgwalk.h"
46 #include "ircons.h"
47 #include "irdump.h"
48 #include "irdom.h"
49 #include "ircons.h"
50 #include "irbitset.h"
51 #include "irnode.h"
52 #include "ircons.h"
53 #include "debug.h"
54 #include "execfreq.h"
55 #include "iredges_t.h"
56 #include "error.h"
57
58 #include "bechordal_t.h"
59 #include "beabi.h"
60 #include "beutil.h"
61 #include "besched.h"
62 #include "besched.h"
63 #include "belive_t.h"
64 #include "bearch.h"
65 #include "beifg.h"
66 #include "benode.h"
67 #include "bestatevent.h"
68 #include "bestat.h"
69 #include "bemodule.h"
70 #include "be_t.h"
71 #include "bera.h"
72 #include "beirg.h"
73 #include "bestack.h"
74
75 #include "bespillslots.h"
76 #include "bespill.h"
77 #include "belower.h"
78
79 #include "becopystat.h"
80 #include "becopyopt.h"
81 #include "bessadestr.h"
82 #include "beverify.h"
83 #include "benode.h"
84
85 #include "bepbqpcoloring.h"
86
87 static be_ra_chordal_opts_t options = {
88         BE_CH_DUMP_NONE,
89         BE_CH_LOWER_PERM_SWAP,
90         BE_CH_VRFY_WARN,
91         "",
92         ""
93 };
94
95 typedef struct post_spill_env_t {
96         be_chordal_env_t            cenv;
97         ir_graph                    *irg;
98         const arch_register_class_t *cls;
99         double                      pre_spill_cost;
100 } post_spill_env_t;
101
102 static const lc_opt_enum_int_items_t lower_perm_items[] = {
103         { "copy", BE_CH_LOWER_PERM_COPY },
104         { "swap", BE_CH_LOWER_PERM_SWAP },
105         { NULL, 0 }
106 };
107
108 static const lc_opt_enum_mask_items_t dump_items[] = {
109         { "none",       BE_CH_DUMP_NONE       },
110         { "spill",      BE_CH_DUMP_SPILL      },
111         { "live",       BE_CH_DUMP_LIVE       },
112         { "color",      BE_CH_DUMP_COLOR      },
113         { "copymin",    BE_CH_DUMP_COPYMIN    },
114         { "ssadestr",   BE_CH_DUMP_SSADESTR   },
115         { "tree",       BE_CH_DUMP_TREE_INTV  },
116         { "constr",     BE_CH_DUMP_CONSTR     },
117         { "lower",      BE_CH_DUMP_LOWER      },
118         { "spillslots", BE_CH_DUMP_SPILLSLOTS },
119         { "appel",      BE_CH_DUMP_APPEL      },
120         { "all",        BE_CH_DUMP_ALL        },
121         { NULL, 0 }
122 };
123
124 static const lc_opt_enum_int_items_t be_ch_vrfy_items[] = {
125         { "off",    BE_CH_VRFY_OFF    },
126         { "warn",   BE_CH_VRFY_WARN   },
127         { "assert", BE_CH_VRFY_ASSERT },
128         { NULL, 0 }
129 };
130
131 static lc_opt_enum_int_var_t lower_perm_var = {
132         &options.lower_perm_opt, lower_perm_items
133 };
134
135 static lc_opt_enum_mask_var_t dump_var = {
136         &options.dump_flags, dump_items
137 };
138
139 static lc_opt_enum_int_var_t be_ch_vrfy_var = {
140         &options.vrfy_option, be_ch_vrfy_items
141 };
142
143 static const lc_opt_table_entry_t be_chordal_options[] = {
144         LC_OPT_ENT_ENUM_INT ("perm",          "perm lowering options", &lower_perm_var),
145         LC_OPT_ENT_ENUM_MASK("dump",          "select dump phases", &dump_var),
146         LC_OPT_ENT_ENUM_INT ("verify",        "verify options", &be_ch_vrfy_var),
147         LC_OPT_LAST
148 };
149
150 static be_module_list_entry_t *colorings = NULL;
151 static const be_ra_chordal_coloring_t *selected_coloring = NULL;
152
153 void be_register_chordal_coloring(const char *name, be_ra_chordal_coloring_t *coloring)
154 {
155         if (selected_coloring == NULL)
156                 selected_coloring = coloring;
157
158         be_add_module_to_list(&colorings, name, coloring);
159 }
160
161 static void be_ra_chordal_coloring(be_chordal_env_t *env)
162 {
163         selected_coloring->allocate(env);
164 }
165
166 static void dump(unsigned mask, ir_graph *irg,
167                                  const arch_register_class_t *cls,
168                                  const char *suffix)
169 {
170         if ((options.dump_flags & mask) == mask) {
171                 if (cls) {
172                         char buf[256];
173                         snprintf(buf, sizeof(buf), "%s-%s", cls->name, suffix);
174                         dump_ir_graph(irg, buf);
175                 } else {
176                         dump_ir_graph(irg, suffix);
177                 }
178         }
179 }
180
181 /**
182  * Post-Walker: Checks for the given reload if has only one user that can perform the
183  * reload as part of its address mode.
184  * Fold the reload into the user it that is possible.
185  */
186 static void memory_operand_walker(ir_node *irn, void *env)
187 {
188         const ir_edge_t  *edge, *ne;
189         ir_node          *block;
190         ir_node          *spill;
191
192         (void)env;
193
194         if (! be_is_Reload(irn))
195                 return;
196
197         /* only use memory operands, if the reload is only used by 1 node */
198         if (get_irn_n_edges(irn) > 1)
199                 return;
200
201         spill = be_get_Reload_mem(irn);
202         block = get_nodes_block(irn);
203
204         foreach_out_edge_safe(irn, edge, ne) {
205                 ir_node *src = get_edge_src_irn(edge);
206                 int     pos  = get_edge_src_pos(edge);
207
208                 assert(src && "outedges broken!");
209
210                 if (get_nodes_block(src) == block && arch_possible_memory_operand(src, pos)) {
211                         arch_perform_memory_operand(src, spill, pos);
212                 }
213         }
214
215         /* kill the Reload if it was folded */
216         if (get_irn_n_edges(irn) == 0) {
217                 ir_graph *irg = get_irn_irg(irn);
218                 ir_mode  *frame_mode = get_irn_mode(get_irn_n(irn, n_be_Reload_frame));
219                 sched_remove(irn);
220                 set_irn_n(irn, n_be_Reload_mem, new_r_Bad(irg, mode_X));
221                 set_irn_n(irn, n_be_Reload_frame, new_r_Bad(irg, frame_mode));
222         }
223 }
224
225 /**
226  * Starts a walk for memory operands if supported by the backend.
227  */
228 void check_for_memory_operands(ir_graph *irg)
229 {
230         irg_walk_graph(irg, NULL, memory_operand_walker, NULL);
231 }
232
233
234 static be_node_stats_t last_node_stats;
235
236 /**
237  * Perform things which need to be done per register class before spilling.
238  */
239 static void pre_spill(post_spill_env_t *pse, const arch_register_class_t *cls)
240 {
241         be_chordal_env_t *chordal_env = &pse->cenv;
242         ir_graph         *irg         = pse->irg;
243         ir_exec_freq     *exec_freq   = be_get_irg_exec_freq(irg);
244
245         pse->cls                      = cls;
246         chordal_env->cls              = cls;
247         chordal_env->border_heads     = pmap_create();
248         chordal_env->allocatable_regs = bitset_malloc(chordal_env->cls->n_regs);
249
250         be_assure_liveness(irg);
251         be_liveness_assure_chk(be_get_irg_liveness(irg));
252
253         if (stat_ev_enabled) {
254                 pse->pre_spill_cost = be_estimate_irg_costs(irg, exec_freq);
255         }
256
257         /* put all ignore registers into the ignore register set. */
258         be_put_allocatable_regs(irg, pse->cls, chordal_env->allocatable_regs);
259
260         be_timer_push(T_RA_CONSTR);
261         be_pre_spill_prepare_constr(irg, chordal_env->cls);
262         be_timer_pop(T_RA_CONSTR);
263
264         dump(BE_CH_DUMP_CONSTR, irg, pse->cls, "constr-pre");
265 }
266
267 /**
268  * Perform things which need to be done per register class after spilling.
269  */
270 static void post_spill(post_spill_env_t *pse, int iteration)
271 {
272         be_chordal_env_t *chordal_env = &pse->cenv;
273         ir_graph         *irg         = pse->irg;
274         ir_exec_freq     *exec_freq   = be_get_irg_exec_freq(irg);
275         int               allocatable_regs = be_get_n_allocatable_regs(irg, chordal_env->cls);
276
277         /* some special classes contain only ignore regs, no work to be done */
278         if (allocatable_regs > 0) {
279                 stat_ev_dbl("bechordal_spillcosts", be_estimate_irg_costs(irg, exec_freq) - pse->pre_spill_cost);
280
281                 /*
282                         If we have a backend provided spiller, post spill is
283                         called in a loop after spilling for each register class.
284                         But we only need to fix stack nodes once in this case.
285                 */
286                 be_timer_push(T_RA_SPILL_APPLY);
287                 check_for_memory_operands(irg);
288                 if (iteration == 0) {
289                         be_abi_fix_stack_nodes(irg);
290                 }
291                 be_timer_pop(T_RA_SPILL_APPLY);
292
293
294                 /* verify schedule and register pressure */
295                 be_timer_push(T_VERIFY);
296                 if (chordal_env->opts->vrfy_option == BE_CH_VRFY_WARN) {
297                         be_verify_schedule(irg);
298                         be_verify_register_pressure(irg, pse->cls);
299                 } else if (chordal_env->opts->vrfy_option == BE_CH_VRFY_ASSERT) {
300                         assert(be_verify_schedule(irg) && "Schedule verification failed");
301                         assert(be_verify_register_pressure(irg, pse->cls)
302                                 && "Register pressure verification failed");
303                 }
304                 be_timer_pop(T_VERIFY);
305
306                 /* Color the graph. */
307                 be_timer_push(T_RA_COLOR);
308                 be_ra_chordal_coloring(chordal_env);
309                 be_timer_pop(T_RA_COLOR);
310
311                 dump(BE_CH_DUMP_CONSTR, irg, pse->cls, "color");
312
313                 /* Create the ifg with the selected flavor */
314                 be_timer_push(T_RA_IFG);
315                 chordal_env->ifg = be_create_ifg(chordal_env);
316                 be_timer_pop(T_RA_IFG);
317
318                 if (stat_ev_enabled) {
319                         be_ifg_stat_t   stat;
320                         be_node_stats_t node_stats;
321
322                         be_ifg_stat(irg, chordal_env->ifg, &stat);
323                         stat_ev_dbl("bechordal_ifg_nodes", stat.n_nodes);
324                         stat_ev_dbl("bechordal_ifg_edges", stat.n_edges);
325                         stat_ev_dbl("bechordal_ifg_comps", stat.n_comps);
326
327                         be_collect_node_stats(&node_stats, irg);
328                         be_subtract_node_stats(&node_stats, &last_node_stats);
329
330                         stat_ev_dbl("bechordal_perms_before_coal",
331                                         node_stats[BE_STAT_PERMS]);
332                         stat_ev_dbl("bechordal_copies_before_coal",
333                                         node_stats[BE_STAT_COPIES]);
334                 }
335
336                 be_timer_push(T_RA_COPYMIN);
337                 co_driver(chordal_env);
338                 be_timer_pop(T_RA_COPYMIN);
339
340                 dump(BE_CH_DUMP_COPYMIN, irg, pse->cls, "copymin");
341
342                 /* ssa destruction */
343                 be_timer_push(T_RA_SSA);
344                 be_ssa_destruction(chordal_env);
345                 be_timer_pop(T_RA_SSA);
346
347                 dump(BE_CH_DUMP_SSADESTR, irg, pse->cls, "ssadestr");
348
349                 if (chordal_env->opts->vrfy_option != BE_CH_VRFY_OFF) {
350                         be_timer_push(T_VERIFY);
351                         be_ssa_destruction_check(chordal_env);
352                         be_timer_pop(T_VERIFY);
353                 }
354
355                 /* the ifg exists only if there are allocatable regs */
356                 be_ifg_free(chordal_env->ifg);
357         }
358
359         /* free some always allocated data structures */
360         pmap_destroy(chordal_env->border_heads);
361         bitset_free(chordal_env->allocatable_regs);
362 }
363
364 /**
365  * Performs chordal register allocation for each register class on given irg.
366  *
367  * @param irg    the graph
368  * @return Structure containing timer for the single phases or NULL if no
369  *         timing requested.
370  */
371 static void be_ra_chordal_main(ir_graph *irg)
372 {
373         const arch_env_t *arch_env = be_get_irg_arch_env(irg);
374         int               j;
375         int               m;
376         be_chordal_env_t  chordal_env;
377         struct obstack    obst;
378
379         be_timer_push(T_RA_OTHER);
380
381         be_timer_push(T_RA_PROLOG);
382
383         be_assure_liveness(irg);
384
385         chordal_env.obst             = &obst;
386         chordal_env.opts             = &options;
387         chordal_env.irg              = irg;
388         chordal_env.border_heads     = NULL;
389         chordal_env.ifg              = NULL;
390         chordal_env.allocatable_regs = NULL;
391
392         obstack_init(&obst);
393
394         be_timer_pop(T_RA_PROLOG);
395
396         if (stat_ev_enabled) {
397                 be_collect_node_stats(&last_node_stats, irg);
398         }
399
400         /* use one of the generic spiller */
401
402         /* Perform the following for each register class. */
403         for (j = 0, m = arch_env->n_register_classes; j < m; ++j) {
404                 post_spill_env_t pse;
405                 const arch_register_class_t *cls = &arch_env->register_classes[j];
406
407                 if (arch_register_class_flags(cls) & arch_register_class_flag_manual_ra)
408                         continue;
409
410
411                 stat_ev_ctx_push_str("bechordal_cls", cls->name);
412
413                 if (stat_ev_enabled) {
414                         be_do_stat_reg_pressure(irg, cls);
415                 }
416
417                 pse.cenv = chordal_env;
418                 pse.irg = irg;
419                 pre_spill(&pse, cls);
420
421                 be_timer_push(T_RA_SPILL);
422                 be_do_spill(irg, cls);
423                 be_timer_pop(T_RA_SPILL);
424
425                 dump(BE_CH_DUMP_SPILL, irg, pse.cls, "spill");
426
427                 post_spill(&pse, 0);
428
429                 if (stat_ev_enabled) {
430                         be_node_stats_t node_stats;
431
432                         be_collect_node_stats(&node_stats, irg);
433                         be_subtract_node_stats(&node_stats, &last_node_stats);
434                         be_emit_node_stats(&node_stats, "bechordal_");
435
436                         be_copy_node_stats(&last_node_stats, &node_stats);
437                         stat_ev_ctx_pop("bechordal_cls");
438                 }
439         }
440
441         be_timer_push(T_VERIFY);
442         if (chordal_env.opts->vrfy_option == BE_CH_VRFY_WARN) {
443                 be_verify_register_allocation(irg);
444         } else if (chordal_env.opts->vrfy_option == BE_CH_VRFY_ASSERT) {
445                 assert(be_verify_register_allocation(irg)
446                                 && "Register allocation invalid");
447         }
448         be_timer_pop(T_VERIFY);
449
450         be_timer_push(T_RA_EPILOG);
451         lower_nodes_after_ra(irg, options.lower_perm_opt == BE_CH_LOWER_PERM_COPY);
452         dump(BE_CH_DUMP_LOWER, irg, NULL, "belower-after-ra");
453
454         obstack_free(&obst, NULL);
455         be_liveness_invalidate(be_get_irg_liveness(irg));
456         be_timer_pop(T_RA_EPILOG);
457
458         be_timer_pop(T_RA_OTHER);
459 }
460
461 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_chordal_main)
462 void be_init_chordal_main(void)
463 {
464         static be_ra_t be_ra_chordal_allocator = {
465                 be_ra_chordal_main,
466         };
467
468         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
469         lc_opt_entry_t *ra_grp = lc_opt_get_grp(be_grp, "ra");
470         lc_opt_entry_t *chordal_grp = lc_opt_get_grp(ra_grp, "chordal");
471
472         be_register_allocator("chordal", &be_ra_chordal_allocator);
473
474         lc_opt_add_table(chordal_grp, be_chordal_options);
475         be_add_module_list_opt(chordal_grp, "coloring", "select coloring methode", &colorings, (void**) &selected_coloring);
476 }