ia32: cleanup handling of 8/16bit operations
[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  */
26 #include "config.h"
27
28 #include <stdlib.h>
29 #include <time.h>
30
31 #include "obst.h"
32 #include "pset.h"
33 #include "list.h"
34 #include "bitset.h"
35
36 #include "lc_opts.h"
37 #include "lc_opts_enum.h"
38
39 #include "ircons_t.h"
40 #include "irmode_t.h"
41 #include "irgraph_t.h"
42 #include "irprintf_t.h"
43 #include "irgwalk.h"
44 #include "ircons.h"
45 #include "irdump.h"
46 #include "irdom.h"
47 #include "ircons.h"
48 #include "irnode.h"
49 #include "ircons.h"
50 #include "irtools.h"
51 #include "debug.h"
52 #include "execfreq.h"
53 #include "iredges_t.h"
54 #include "error.h"
55
56 #include "bechordal_t.h"
57 #include "beabi.h"
58 #include "beutil.h"
59 #include "besched.h"
60 #include "besched.h"
61 #include "belive_t.h"
62 #include "bearch.h"
63 #include "beifg.h"
64 #include "benode.h"
65 #include "bestatevent.h"
66 #include "bestat.h"
67 #include "bemodule.h"
68 #include "be_t.h"
69 #include "bera.h"
70 #include "beirg.h"
71 #include "bestack.h"
72
73 #include "bespillslots.h"
74 #include "bespill.h"
75 #include "belower.h"
76
77 #include "becopystat.h"
78 #include "becopyopt.h"
79 #include "bessadestr.h"
80 #include "beverify.h"
81 #include "benode.h"
82
83 #include "bepbqpcoloring.h"
84
85 static be_ra_chordal_opts_t options = {
86         BE_CH_DUMP_NONE,
87         BE_CH_LOWER_PERM_SWAP,
88         BE_CH_VRFY_WARN,
89         "",
90         ""
91 };
92
93 typedef struct post_spill_env_t {
94         be_chordal_env_t            cenv;
95         ir_graph                    *irg;
96         const arch_register_class_t *cls;
97         double                      pre_spill_cost;
98 } post_spill_env_t;
99
100 static const lc_opt_enum_int_items_t lower_perm_items[] = {
101         { "copy", BE_CH_LOWER_PERM_COPY },
102         { "swap", BE_CH_LOWER_PERM_SWAP },
103         { NULL, 0 }
104 };
105
106 static const lc_opt_enum_mask_items_t dump_items[] = {
107         { "none",       BE_CH_DUMP_NONE       },
108         { "spill",      BE_CH_DUMP_SPILL      },
109         { "live",       BE_CH_DUMP_LIVE       },
110         { "color",      BE_CH_DUMP_COLOR      },
111         { "copymin",    BE_CH_DUMP_COPYMIN    },
112         { "ssadestr",   BE_CH_DUMP_SSADESTR   },
113         { "tree",       BE_CH_DUMP_TREE_INTV  },
114         { "split",      BE_CH_DUMP_SPLIT      },
115         { "constr",     BE_CH_DUMP_CONSTR     },
116         { "lower",      BE_CH_DUMP_LOWER      },
117         { "spillslots", BE_CH_DUMP_SPILLSLOTS },
118         { "appel",      BE_CH_DUMP_APPEL      },
119         { "all",        BE_CH_DUMP_ALL        },
120         { NULL, 0 }
121 };
122
123 static const lc_opt_enum_int_items_t be_ch_vrfy_items[] = {
124         { "off",    BE_CH_VRFY_OFF    },
125         { "warn",   BE_CH_VRFY_WARN   },
126         { "assert", BE_CH_VRFY_ASSERT },
127         { NULL, 0 }
128 };
129
130 static lc_opt_enum_int_var_t lower_perm_var = {
131         &options.lower_perm_opt, lower_perm_items
132 };
133
134 static lc_opt_enum_mask_var_t dump_var = {
135         &options.dump_flags, dump_items
136 };
137
138 static lc_opt_enum_int_var_t be_ch_vrfy_var = {
139         &options.vrfy_option, be_ch_vrfy_items
140 };
141
142 static const lc_opt_table_entry_t be_chordal_options[] = {
143         LC_OPT_ENT_ENUM_INT ("perm",          "perm lowering options", &lower_perm_var),
144         LC_OPT_ENT_ENUM_MASK("dump",          "select dump phases", &dump_var),
145         LC_OPT_ENT_ENUM_INT ("verify",        "verify options", &be_ch_vrfy_var),
146         LC_OPT_LAST
147 };
148
149 static be_module_list_entry_t *colorings = NULL;
150 static const be_ra_chordal_coloring_t *selected_coloring = NULL;
151
152 void be_register_chordal_coloring(const char *name, be_ra_chordal_coloring_t *coloring)
153 {
154         if (selected_coloring == NULL)
155                 selected_coloring = coloring;
156
157         be_add_module_to_list(&colorings, name, coloring);
158 }
159
160 static void be_ra_chordal_coloring(be_chordal_env_t *env)
161 {
162         selected_coloring->allocate(env);
163 }
164
165 static void dump(unsigned mask, ir_graph *irg,
166                                  const arch_register_class_t *cls,
167                                  const char *suffix)
168 {
169         if ((options.dump_flags & mask) == mask) {
170                 if (cls) {
171                         char buf[256];
172                         snprintf(buf, sizeof(buf), "%s-%s", cls->name, suffix);
173                         dump_ir_graph(irg, buf);
174                 } else {
175                         dump_ir_graph(irg, suffix);
176                 }
177         }
178 }
179
180 /**
181  * Post-Walker: Checks for the given reload if has only one user that can perform the
182  * reload as part of its address mode.
183  * Fold the reload into the user it that is possible.
184  */
185 static void memory_operand_walker(ir_node *irn, void *env)
186 {
187         ir_node *block;
188         ir_node *spill;
189
190         (void)env;
191
192         if (! be_is_Reload(irn))
193                 return;
194
195         /* only use memory operands, if the reload is only used by 1 node */
196         if (get_irn_n_edges(irn) > 1)
197                 return;
198
199         spill = be_get_Reload_mem(irn);
200         block = get_nodes_block(irn);
201
202         foreach_out_edge_safe(irn, edge) {
203                 ir_node *src = get_edge_src_irn(edge);
204                 int     pos  = get_edge_src_pos(edge);
205
206                 assert(src && "outedges broken!");
207
208                 if (get_nodes_block(src) == block && arch_possible_memory_operand(src, pos)) {
209                         arch_perform_memory_operand(src, spill, pos);
210                 }
211         }
212
213         /* kill the Reload if it was folded */
214         if (get_irn_n_edges(irn) == 0) {
215                 ir_graph *irg = get_irn_irg(irn);
216                 ir_mode  *frame_mode = get_irn_mode(get_irn_n(irn, n_be_Reload_frame));
217                 sched_remove(irn);
218                 set_irn_n(irn, n_be_Reload_mem, new_r_Bad(irg, mode_X));
219                 set_irn_n(irn, n_be_Reload_frame, new_r_Bad(irg, frame_mode));
220         }
221 }
222
223 /**
224  * Starts a walk for memory operands if supported by the backend.
225  */
226 void check_for_memory_operands(ir_graph *irg)
227 {
228         irg_walk_graph(irg, NULL, memory_operand_walker, NULL);
229 }
230
231
232 static be_node_stats_t last_node_stats;
233
234 /**
235  * Perform things which need to be done per register class before spilling.
236  */
237 static void pre_spill(post_spill_env_t *pse, const arch_register_class_t *cls)
238 {
239         be_chordal_env_t *chordal_env = &pse->cenv;
240         ir_graph         *irg         = pse->irg;
241
242         pse->cls                      = cls;
243         chordal_env->cls              = cls;
244         chordal_env->border_heads     = pmap_create();
245         chordal_env->allocatable_regs = bitset_malloc(chordal_env->cls->n_regs);
246
247         be_assure_live_chk(irg);
248
249         if (stat_ev_enabled) {
250                 pse->pre_spill_cost = be_estimate_irg_costs(irg);
251         }
252
253         /* put all ignore registers into the ignore register set. */
254         be_put_allocatable_regs(irg, pse->cls, chordal_env->allocatable_regs);
255
256         be_timer_push(T_RA_CONSTR);
257         be_pre_spill_prepare_constr(irg, chordal_env->cls);
258         be_timer_pop(T_RA_CONSTR);
259
260         dump(BE_CH_DUMP_CONSTR, irg, pse->cls, "constr-pre");
261 }
262
263 /**
264  * Perform things which need to be done per register class after spilling.
265  */
266 static void post_spill(post_spill_env_t *pse, int iteration)
267 {
268         be_chordal_env_t *chordal_env = &pse->cenv;
269         ir_graph         *irg         = pse->irg;
270         int               allocatable_regs = be_get_n_allocatable_regs(irg, chordal_env->cls);
271
272         /* some special classes contain only ignore regs, no work to be done */
273         if (allocatable_regs > 0) {
274                 stat_ev_dbl("bechordal_spillcosts", be_estimate_irg_costs(irg) - pse->pre_spill_cost);
275
276                 /*
277                         If we have a backend provided spiller, post spill is
278                         called in a loop after spilling for each register class.
279                         But we only need to fix stack nodes once in this case.
280                 */
281                 be_timer_push(T_RA_SPILL_APPLY);
282                 check_for_memory_operands(irg);
283                 if (iteration == 0) {
284                         be_abi_fix_stack_nodes(irg);
285                 }
286                 be_timer_pop(T_RA_SPILL_APPLY);
287
288
289                 /* verify schedule and register pressure */
290                 be_timer_push(T_VERIFY);
291                 if (chordal_env->opts->vrfy_option == BE_CH_VRFY_WARN) {
292                         be_verify_schedule(irg);
293                         be_verify_register_pressure(irg, pse->cls);
294                 } else if (chordal_env->opts->vrfy_option == BE_CH_VRFY_ASSERT) {
295                         assert(be_verify_schedule(irg) && "Schedule verification failed");
296                         assert(be_verify_register_pressure(irg, pse->cls)
297                                 && "Register pressure verification failed");
298                 }
299                 be_timer_pop(T_VERIFY);
300
301                 /* Color the graph. */
302                 be_timer_push(T_RA_COLOR);
303                 be_ra_chordal_coloring(chordal_env);
304                 be_timer_pop(T_RA_COLOR);
305
306                 dump(BE_CH_DUMP_CONSTR, irg, pse->cls, "color");
307
308                 /* Create the ifg with the selected flavor */
309                 be_timer_push(T_RA_IFG);
310                 chordal_env->ifg = be_create_ifg(chordal_env);
311                 be_timer_pop(T_RA_IFG);
312
313                 if (stat_ev_enabled) {
314                         be_ifg_stat_t   stat;
315                         be_node_stats_t node_stats;
316
317                         be_ifg_stat(irg, chordal_env->ifg, &stat);
318                         stat_ev_dbl("bechordal_ifg_nodes", stat.n_nodes);
319                         stat_ev_dbl("bechordal_ifg_edges", stat.n_edges);
320                         stat_ev_dbl("bechordal_ifg_comps", stat.n_comps);
321
322                         be_collect_node_stats(&node_stats, irg);
323                         be_subtract_node_stats(&node_stats, &last_node_stats);
324
325                         stat_ev_dbl("bechordal_perms_before_coal",
326                                         node_stats[BE_STAT_PERMS]);
327                         stat_ev_dbl("bechordal_copies_before_coal",
328                                         node_stats[BE_STAT_COPIES]);
329                 }
330
331                 be_timer_push(T_RA_COPYMIN);
332                 co_driver(chordal_env);
333                 be_timer_pop(T_RA_COPYMIN);
334
335                 dump(BE_CH_DUMP_COPYMIN, irg, pse->cls, "copymin");
336
337                 /* ssa destruction */
338                 be_timer_push(T_RA_SSA);
339                 be_ssa_destruction(chordal_env);
340                 be_timer_pop(T_RA_SSA);
341
342                 dump(BE_CH_DUMP_SSADESTR, irg, pse->cls, "ssadestr");
343
344                 if (chordal_env->opts->vrfy_option != BE_CH_VRFY_OFF) {
345                         be_timer_push(T_VERIFY);
346                         be_ssa_destruction_check(chordal_env);
347                         be_timer_pop(T_VERIFY);
348                 }
349
350                 /* the ifg exists only if there are allocatable regs */
351                 be_ifg_free(chordal_env->ifg);
352         }
353
354         /* free some always allocated data structures */
355         pmap_destroy(chordal_env->border_heads);
356         bitset_free(chordal_env->allocatable_regs);
357 }
358
359 /**
360  * Performs chordal register allocation for each register class on given irg.
361  *
362  * @param irg    the graph
363  * @return Structure containing timer for the single phases or NULL if no
364  *         timing requested.
365  */
366 static void be_ra_chordal_main(ir_graph *irg)
367 {
368         const arch_env_t *arch_env = be_get_irg_arch_env(irg);
369         int               j;
370         int               m;
371         be_chordal_env_t  chordal_env;
372         struct obstack    obst;
373
374         be_timer_push(T_RA_OTHER);
375
376         be_timer_push(T_RA_PROLOG);
377
378         chordal_env.obst             = &obst;
379         chordal_env.opts             = &options;
380         chordal_env.irg              = irg;
381         chordal_env.border_heads     = NULL;
382         chordal_env.ifg              = NULL;
383         chordal_env.allocatable_regs = NULL;
384
385         obstack_init(&obst);
386
387         be_timer_pop(T_RA_PROLOG);
388
389         if (stat_ev_enabled) {
390                 be_collect_node_stats(&last_node_stats, irg);
391         }
392
393         /* use one of the generic spiller */
394
395         /* Perform the following for each register class. */
396         for (j = 0, m = arch_env->n_register_classes; j < m; ++j) {
397                 post_spill_env_t pse;
398                 const arch_register_class_t *cls = &arch_env->register_classes[j];
399
400                 if (arch_register_class_flags(cls) & arch_register_class_flag_manual_ra)
401                         continue;
402
403
404                 stat_ev_ctx_push_str("bechordal_cls", cls->name);
405
406                 if (stat_ev_enabled) {
407                         be_do_stat_reg_pressure(irg, cls);
408                 }
409
410                 pse.cenv = chordal_env;
411                 pse.irg = irg;
412                 pre_spill(&pse, cls);
413
414                 be_timer_push(T_RA_SPILL);
415                 be_do_spill(irg, cls);
416                 be_timer_pop(T_RA_SPILL);
417
418                 dump(BE_CH_DUMP_SPILL, irg, pse.cls, "spill");
419
420                 post_spill(&pse, 0);
421
422                 if (stat_ev_enabled) {
423                         be_node_stats_t node_stats;
424
425                         be_collect_node_stats(&node_stats, irg);
426                         be_subtract_node_stats(&node_stats, &last_node_stats);
427                         be_emit_node_stats(&node_stats, "bechordal_");
428
429                         be_copy_node_stats(&last_node_stats, &node_stats);
430                         stat_ev_ctx_pop("bechordal_cls");
431                 }
432         }
433
434         be_timer_push(T_VERIFY);
435         if (chordal_env.opts->vrfy_option == BE_CH_VRFY_WARN) {
436                 be_verify_register_allocation(irg);
437         } else if (chordal_env.opts->vrfy_option == BE_CH_VRFY_ASSERT) {
438                 assert(be_verify_register_allocation(irg)
439                                 && "Register allocation invalid");
440         }
441         be_timer_pop(T_VERIFY);
442
443         be_timer_push(T_RA_EPILOG);
444         lower_nodes_after_ra(irg, options.lower_perm_opt == BE_CH_LOWER_PERM_COPY);
445         dump(BE_CH_DUMP_LOWER, irg, NULL, "belower-after-ra");
446
447         obstack_free(&obst, NULL);
448         be_invalidate_live_sets(irg);
449         be_timer_pop(T_RA_EPILOG);
450
451         be_timer_pop(T_RA_OTHER);
452 }
453
454 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_chordal_main)
455 void be_init_chordal_main(void)
456 {
457         static be_ra_t be_ra_chordal_allocator = {
458                 be_ra_chordal_main,
459         };
460
461         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
462         lc_opt_entry_t *ra_grp = lc_opt_get_grp(be_grp, "ra");
463         lc_opt_entry_t *chordal_grp = lc_opt_get_grp(ra_grp, "chordal");
464
465         be_register_allocator("chordal", &be_ra_chordal_allocator);
466
467         lc_opt_add_table(chordal_grp, be_chordal_options);
468         be_add_module_list_opt(chordal_grp, "coloring", "select coloring method", &colorings, (void**) &selected_coloring);
469 }