2 * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
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.
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.
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
22 * @brief Beladys spillalgorithm.
23 * @author Daniel Grund, Matthias Braun
32 #include "irprintf_t.h"
38 #include "iredges_t.h"
41 #include "irnodeset.h"
50 #include "bechordal_t.h"
52 #include "beloopana.h"
54 #include "bespillutil.h"
64 #define DBG_WORKSET 128
65 DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
67 #define TIME_UNDEFINED 6666
70 * An association between a node and a point in time.
72 typedef struct loc_t {
74 unsigned time; /**< A use time (see beuses.h). */
75 bool spilled; /**< value was already spilled on this path */
78 typedef struct workset_t {
79 unsigned len; /**< current length */
80 loc_t vals[0]; /**< array of the values/distances in this working set */
83 static struct obstack obst;
84 static const arch_register_class_t *cls;
85 static const be_lv_t *lv;
86 static be_loopana_t *loop_ana;
87 static unsigned n_regs;
88 static workset_t *ws; /**< the main workset used while
89 processing a block. */
90 static be_uses_t *uses; /**< env for the next-use magic */
91 static ir_node *instr; /**< current instruction */
92 static spill_env_t *senv; /**< see bespill.h */
93 static ir_node **blocklist;
95 static int move_spills = true;
96 static int respectloopdepth = true;
97 static int improve_known_preds = true;
98 /* factor to weight the different costs of reloading/rematerializing a node
99 (see bespill.h be_get_reload_costs_no_weight) */
100 static int remat_bonus = 10;
102 static const lc_opt_table_entry_t options[] = {
103 LC_OPT_ENT_BOOL ("movespills", "try to move spills out of loops", &move_spills),
104 LC_OPT_ENT_BOOL ("respectloopdepth", "outermost loop cutting", &respectloopdepth),
105 LC_OPT_ENT_BOOL ("improveknownpreds", "known preds cutting", &improve_known_preds),
106 LC_OPT_ENT_INT ("rematbonus", "give bonus to rematerialisable nodes", &remat_bonus),
111 * Alloc a new workset on obstack @p ob with maximum size @p max
113 static workset_t *new_workset(void)
115 return OALLOCFZ(&obst, workset_t, vals, n_regs);
119 * Alloc a new instance on obstack and make it equal to @param workset
121 static workset_t *workset_clone(workset_t *workset)
123 workset_t *res = OALLOCF(&obst, workset_t, vals, n_regs);
124 memcpy(res, workset, sizeof(*res) + n_regs * sizeof(res->vals[0]));
129 * Copy workset @param src to @param tgt
131 static void workset_copy(workset_t *dest, const workset_t *src)
133 size_t size = sizeof(*src) + n_regs * sizeof(src->vals[0]);
134 memcpy(dest, src, size);
138 * Overwrites the current content array of @param ws with the
139 * @param count locations given at memory @param locs.
140 * Set the length of @param ws to count.
142 static void workset_bulk_fill(workset_t *workset, int count, const loc_t *locs)
144 workset->len = count;
145 memcpy(&(workset->vals[0]), locs, count * sizeof(locs[0]));
149 * Inserts the value @p val into the workset, iff it is not
150 * already contained. The workset must not be full.
152 static void workset_insert(workset_t *workset, ir_node *val, bool spilled)
156 /* check for current regclass */
157 assert(arch_irn_consider_in_reg_alloc(cls, val));
159 /* check if val is already contained */
160 for (i = 0; i < workset->len; ++i) {
161 loc = &workset->vals[i];
162 if (loc->node == val) {
171 assert(workset->len < n_regs && "Workset already full!");
172 loc = &workset->vals[workset->len];
174 loc->spilled = spilled;
175 loc->time = TIME_UNDEFINED;
180 * Removes all entries from this workset
182 static void workset_clear(workset_t *workset)
188 * Removes the value @p val from the workset if present.
190 static void workset_remove(workset_t *workset, ir_node *val)
193 for (i = 0; i < workset->len; ++i) {
194 if (workset->vals[i].node == val) {
195 workset->vals[i] = workset->vals[--workset->len];
201 static const loc_t *workset_contains(const workset_t *ws, const ir_node *val)
204 for (i = 0; i < ws->len; ++i) {
205 if (ws->vals[i].node == val)
212 static int loc_compare(const void *a, const void *b)
214 const loc_t *p = (const loc_t*)a;
215 const loc_t *q = (const loc_t*)b;
216 return p->time - q->time;
219 static void workset_sort(workset_t *workset)
221 qsort(workset->vals, workset->len, sizeof(workset->vals[0]), loc_compare);
224 static inline unsigned workset_get_time(const workset_t *workset, unsigned idx)
226 return workset->vals[idx].time;
229 static inline void workset_set_time(workset_t *workset, unsigned idx,
232 workset->vals[idx].time = time;
235 static inline unsigned workset_get_length(const workset_t *workset)
240 static inline void workset_set_length(workset_t *workset, unsigned len)
245 static inline ir_node *workset_get_val(const workset_t *workset, unsigned idx)
247 return workset->vals[idx].node;
251 * Iterates over all values in the working set.
252 * @p ws The workset to iterate
253 * @p v A variable to put the current value in
254 * @p i An integer for internal use
256 #define workset_foreach(ws, v, i) \
257 for (i=0; v=(i < ws->len) ? ws->vals[i].node : NULL, i < ws->len; ++i)
259 typedef struct block_info_t {
260 workset_t *start_workset;
261 workset_t *end_workset;
264 static block_info_t *new_block_info(void)
266 return OALLOCZ(&obst, block_info_t);
269 static inline block_info_t *get_block_info(const ir_node *block)
271 return (block_info_t*)get_irn_link(block);
274 static inline void set_block_info(ir_node *block, block_info_t *info)
276 set_irn_link(block, info);
280 * @return The distance to the next use or 0 if irn has dont_spill flag set
282 static unsigned get_distance(ir_node *from, const ir_node *def, int skip_from_uses)
288 assert(!arch_irn_is_ignore(def));
290 use = be_get_next_use(uses, from, def, skip_from_uses);
292 if (USES_IS_INFINITE(time))
293 return USES_INFINITY;
295 /* We have to keep nonspillable nodes in the workingset */
296 if (arch_get_irn_flags(skip_Proj_const(def)) & arch_irn_flags_dont_spill)
299 /* give some bonus to rematerialisable nodes */
300 if (remat_bonus > 0) {
301 costs = be_get_reload_costs_no_weight(senv, def, use.before);
302 assert(costs * remat_bonus < 1000);
303 time += 1000 - (costs * remat_bonus);
310 * Performs the actions necessary to grant the request that:
311 * - new_vals can be held in registers
312 * - as few as possible other values are disposed
313 * - the worst values get disposed
315 * @p is_usage indicates that the values in new_vals are used (not defined)
316 * In this case reloads must be performed
318 static void displace(workset_t *new_vals, int is_usage)
320 ir_node **to_insert = ALLOCAN(ir_node*, n_regs);
321 bool *spilled = ALLOCAN(bool, n_regs);
329 /* 1. Identify the number of needed slots and the values to reload */
331 workset_foreach(new_vals, val, iter) {
332 bool reloaded = false;
334 if (! workset_contains(ws, val)) {
335 DB((dbg, DBG_DECIDE, " insert %+F\n", val));
337 DB((dbg, DBG_SPILL, "Reload %+F before %+F\n", val, instr));
338 be_add_reload(senv, val, instr, cls, 1);
342 DB((dbg, DBG_DECIDE, " %+F already in workset\n", val));
344 /* remove the value from the current workset so it is not accidently
346 workset_remove(ws, val);
348 spilled[demand] = reloaded;
349 to_insert[demand] = val;
353 /* 2. Make room for at least 'demand' slots */
354 len = workset_get_length(ws);
355 spills_needed = len + demand - n_regs;
356 assert(spills_needed <= len);
358 /* Only make more free room if we do not have enough */
359 if (spills_needed > 0) {
360 DB((dbg, DBG_DECIDE, " disposing %d values\n", spills_needed));
362 /* calculate current next-use distance for live values */
363 for (i = 0; i < len; ++i) {
364 ir_node *val = workset_get_val(ws, i);
365 unsigned dist = get_distance(instr, val, !is_usage);
366 workset_set_time(ws, i, dist);
369 /* sort entries by increasing nextuse-distance*/
372 for (i = len - spills_needed; i < len; ++i) {
373 ir_node *val = ws->vals[i].node;
375 DB((dbg, DBG_DECIDE, " disposing node %+F (%u)\n", val,
376 workset_get_time(ws, i)));
379 if (!USES_IS_INFINITE(ws->vals[i].time)
380 && !ws->vals[i].spilled) {
381 ir_node *after_pos = sched_prev(instr);
382 DB((dbg, DBG_DECIDE, "Spill %+F after node %+F\n", val,
384 be_add_spill(senv, val, after_pos);
389 /* kill the last 'demand' entries in the array */
390 workset_set_length(ws, len - spills_needed);
393 /* 3. Insert the new values into the workset */
394 for (i = 0; i < demand; ++i) {
395 ir_node *val = to_insert[i];
397 workset_insert(ws, val, spilled[i]);
402 AVAILABLE_EVERYWHERE,
408 static unsigned available_in_all_preds(workset_t* const* pred_worksets,
409 size_t n_pred_worksets,
410 const ir_node *value, bool is_local_phi)
413 bool avail_everywhere = true;
414 bool avail_nowhere = true;
416 assert(n_pred_worksets > 0);
418 /* value available in all preds? */
419 for (i = 0; i < n_pred_worksets; ++i) {
421 const workset_t *p_workset = pred_worksets[i];
422 int p_len = workset_get_length(p_workset);
424 const ir_node *l_value;
427 assert(is_Phi(value));
428 l_value = get_irn_n(value, i);
433 for (p_i = 0; p_i < p_len; ++p_i) {
434 const loc_t *p_l = &p_workset->vals[p_i];
435 if (p_l->node != l_value)
443 avail_nowhere = false;
445 avail_everywhere = false;
449 if (avail_everywhere) {
450 assert(!avail_nowhere);
451 return AVAILABLE_EVERYWHERE;
452 } else if (avail_nowhere) {
453 return AVAILABLE_NOWHERE;
455 return AVAILABLE_PARTLY;
459 /** Decides whether a specific node should be in the start workset or not
461 * @param env belady environment
463 * @param node the node to test
464 * @param loop the loop of the node
466 static loc_t to_take_or_not_to_take(ir_node* first, ir_node *node,
467 ir_loop *loop, unsigned available)
469 be_next_use_t next_use;
472 loc.time = USES_INFINITY;
476 if (!arch_irn_consider_in_reg_alloc(cls, node)) {
477 loc.time = USES_INFINITY;
481 /* We have to keep nonspillable nodes in the workingset */
482 if (arch_get_irn_flags(skip_Proj_const(node)) & arch_irn_flags_dont_spill) {
484 DB((dbg, DBG_START, " %+F taken (dontspill node)\n", node, loc.time));
488 next_use = be_get_next_use(uses, first, node, 0);
489 if (USES_IS_INFINITE(next_use.time)) {
490 /* the nodes marked as live in shouldn't be dead, so it must be a phi */
491 assert(is_Phi(node));
492 loc.time = USES_INFINITY;
493 DB((dbg, DBG_START, " %+F not taken (dead)\n", node));
497 loc.time = next_use.time;
499 if (improve_known_preds) {
500 if (available == AVAILABLE_EVERYWHERE) {
501 DB((dbg, DBG_START, " %+F taken (%u, live in all preds)\n",
504 } else if (available == AVAILABLE_NOWHERE) {
505 DB((dbg, DBG_START, " %+F not taken (%u, live in no pred)\n",
507 loc.time = USES_INFINITY;
512 if (!respectloopdepth || next_use.outermost_loop >= get_loop_depth(loop)) {
513 DB((dbg, DBG_START, " %+F taken (%u, loop %d)\n", node, loc.time,
514 next_use.outermost_loop));
516 loc.time = USES_PENDING;
517 DB((dbg, DBG_START, " %+F delayed (outerdepth %d < loopdepth %d)\n",
518 node, next_use.outermost_loop, get_loop_depth(loop)));
525 * Computes the start-workset for a block with multiple predecessors. We assume
526 * that at least 1 of the predeccesors is a back-edge which means we're at the
527 * beginning of a loop. We try to reload as much values as possible now so they
528 * don't get reloaded inside the loop.
530 static void decide_start_workset(const ir_node *block)
532 ir_loop *loop = get_irn_loop(block);
542 int free_slots, free_pressure_slots;
545 workset_t **pred_worksets;
546 bool all_preds_known;
548 /* check predecessors */
549 arity = get_irn_arity(block);
550 pred_worksets = ALLOCAN(workset_t*, arity);
551 all_preds_known = true;
552 for (in = 0; in < arity; ++in) {
553 ir_node *pred_block = get_Block_cfgpred_block(block, in);
554 block_info_t *pred_info = get_block_info(pred_block);
556 if (pred_info == NULL) {
557 pred_worksets[in] = NULL;
558 all_preds_known = false;
560 pred_worksets[in] = pred_info->end_workset;
564 /* Collect all values living at start of block */
565 starters = NEW_ARR_F(loc_t, 0);
566 delayed = NEW_ARR_F(loc_t, 0);
568 DB((dbg, DBG_START, "Living at start of %+F:\n", block));
569 first = sched_first(block);
571 /* check all Phis first */
572 sched_foreach(block, node) {
577 if (!arch_irn_consider_in_reg_alloc(cls, node))
580 if (all_preds_known) {
581 available = available_in_all_preds(pred_worksets, arity, node, true);
583 available = AVAILABLE_UNKNOWN;
586 loc = to_take_or_not_to_take(first, node, loop, available);
588 if (! USES_IS_INFINITE(loc.time)) {
589 if (USES_IS_PENDING(loc.time))
590 ARR_APP1(loc_t, delayed, loc);
592 ARR_APP1(loc_t, starters, loc);
594 be_spill_phi(senv, node);
598 /* check all Live-Ins */
599 be_lv_foreach(lv, block, be_lv_state_in, in) {
600 ir_node *node = be_lv_get_irn(lv, block, in);
603 if (all_preds_known) {
604 available = available_in_all_preds(pred_worksets, arity, node, false);
606 available = AVAILABLE_UNKNOWN;
609 loc = to_take_or_not_to_take(first, node, loop, available);
611 if (! USES_IS_INFINITE(loc.time)) {
612 if (USES_IS_PENDING(loc.time))
613 ARR_APP1(loc_t, delayed, loc);
615 ARR_APP1(loc_t, starters, loc);
619 pressure = be_get_loop_pressure(loop_ana, cls, loop);
620 assert(ARR_LEN(delayed) <= pressure);
621 free_slots = n_regs - ARR_LEN(starters);
622 free_pressure_slots = n_regs - (pressure - ARR_LEN(delayed));
623 free_slots = MIN(free_slots, free_pressure_slots);
625 /* so far we only put nodes into the starters list that are used inside
626 * the loop. If register pressure in the loop is low then we can take some
627 * values and let them live through the loop */
628 DB((dbg, DBG_START, "Loop pressure %d, taking %d delayed vals\n",
629 pressure, free_slots));
630 if (free_slots > 0) {
633 qsort(delayed, ARR_LEN(delayed), sizeof(delayed[0]), loc_compare);
635 for (i = 0; i < ARR_LEN(delayed) && free_slots > 0; ++i) {
637 loc_t *loc = & delayed[i];
639 if (!is_Phi(loc->node)) {
640 /* don't use values which are dead in a known predecessors
641 * to not induce unnecessary reloads */
642 arity = get_irn_arity(block);
643 for (p = 0; p < arity; ++p) {
644 ir_node *pred_block = get_Block_cfgpred_block(block, p);
645 block_info_t *pred_info = get_block_info(pred_block);
647 if (pred_info == NULL)
650 if (!workset_contains(pred_info->end_workset, loc->node)) {
652 " delayed %+F not live at pred %+F\n", loc->node,
659 DB((dbg, DBG_START, " delayed %+F taken\n", loc->node));
660 ARR_APP1(loc_t, starters, *loc);
668 /* spill phis (the actual phis not just their values) that are in this block
669 * but not in the start workset */
670 len = ARR_LEN(delayed);
671 for (i = 0; i < len; ++i) {
672 ir_node *node = delayed[i].node;
673 if (node == NULL || !is_Phi(node) || get_nodes_block(node) != block)
676 DB((dbg, DBG_START, " spilling delayed phi %+F\n", node));
677 be_spill_phi(senv, node);
681 /* Sort start values by first use */
682 qsort(starters, ARR_LEN(starters), sizeof(starters[0]), loc_compare);
684 /* Copy the best ones from starters to start workset */
685 ws_count = MIN((unsigned) ARR_LEN(starters), n_regs);
687 workset_bulk_fill(ws, ws_count, starters);
689 /* spill phis (the actual phis not just their values) that are in this block
690 * but not in the start workset */
691 len = ARR_LEN(starters);
692 for (i = ws_count; i < len; ++i) {
693 ir_node *node = starters[i].node;
694 if (! is_Phi(node) || get_nodes_block(node) != block)
697 DB((dbg, DBG_START, " spilling phi %+F\n", node));
698 be_spill_phi(senv, node);
703 /* determine spill status of the values: If there's 1 pred block (which
704 * is no backedge) where the value is spilled then we must set it to
706 for (i = 0; i < ws_count; ++i) {
707 loc_t *loc = &ws->vals[i];
708 ir_node *value = loc->node;
712 /* phis from this block aren't spilled */
713 if (get_nodes_block(value) == block) {
714 assert(is_Phi(value));
715 loc->spilled = false;
719 /* determine if value was spilled on any predecessor */
721 for (n = 0; n < arity; ++n) {
722 workset_t *pred_workset = pred_worksets[n];
726 if (pred_workset == NULL)
729 p_len = workset_get_length(pred_workset);
730 for (p = 0; p < p_len; ++p) {
731 loc_t *l = &pred_workset->vals[p];
733 if (l->node != value)
743 loc->spilled = spilled;
748 * For the given block @p block, decide for each values
749 * whether it is used from a register or is reloaded
752 static void process_block(ir_node *block)
757 block_info_t *block_info;
760 /* no need to process a block twice */
761 assert(get_block_info(block) == NULL);
763 /* construct start workset */
764 arity = get_Block_n_cfgpreds(block);
766 /* no predecessor -> empty set */
768 } else if (arity == 1) {
769 /* one predecessor, copy its end workset */
770 ir_node *pred_block = get_Block_cfgpred_block(block, 0);
771 block_info_t *pred_info = get_block_info(pred_block);
773 assert(pred_info != NULL);
774 workset_copy(ws, pred_info->end_workset);
776 /* multiple predecessors, do more advanced magic :) */
777 decide_start_workset(block);
780 DB((dbg, DBG_DECIDE, "\n"));
781 DB((dbg, DBG_DECIDE, "Decide for %+F\n", block));
783 block_info = new_block_info();
784 set_block_info(block, block_info);
786 DB((dbg, DBG_WSETS, "Start workset for %+F:\n", block));
787 workset_foreach(ws, irn, iter) {
788 DB((dbg, DBG_WSETS, " %+F (%u)\n", irn,
789 workset_get_time(ws, iter)));
792 block_info->start_workset = workset_clone(ws);
794 /* process the block from start to end */
795 DB((dbg, DBG_WSETS, "Processing...\n"));
796 /* TODO: this leaks (into the obstack)... */
797 new_vals = new_workset();
799 sched_foreach(block, irn) {
802 assert(workset_get_length(ws) <= n_regs);
804 /* Phis are no real instr (see insert_starters()) */
808 DB((dbg, DBG_DECIDE, " ...%+F\n", irn));
810 /* set instruction in the workset */
813 /* allocate all values _used_ by this instruction */
814 workset_clear(new_vals);
815 for (i = 0, arity = get_irn_arity(irn); i < arity; ++i) {
816 ir_node *in = get_irn_n(irn, i);
817 if (!arch_irn_consider_in_reg_alloc(cls, in))
820 /* (note that "spilled" is irrelevant here) */
821 workset_insert(new_vals, in, false);
823 displace(new_vals, 1);
825 /* allocate all values _defined_ by this instruction */
826 workset_clear(new_vals);
827 be_foreach_definition(irn, cls, value,
828 assert(req_->width == 1);
829 workset_insert(new_vals, value, false);
831 displace(new_vals, 0);
834 /* Remember end-workset for this block */
835 block_info->end_workset = workset_clone(ws);
836 DB((dbg, DBG_WSETS, "End workset for %+F:\n", block));
837 workset_foreach(ws, irn, iter)
838 DB((dbg, DBG_WSETS, " %+F (%u)\n", irn, workset_get_time(ws, iter)));
842 * 'decide' is block-local and makes assumptions
843 * about the set of live-ins. Thus we must adapt the
844 * live-outs to the live-ins at each block-border.
846 static void fix_block_borders(ir_node *block, void *data)
848 workset_t *start_workset;
854 DB((dbg, DBG_FIX, "\n"));
855 DB((dbg, DBG_FIX, "Fixing %+F\n", block));
857 arity = get_irn_arity(block);
858 /* can happen for endless loops */
862 start_workset = get_block_info(block)->start_workset;
864 /* process all pred blocks */
865 for (i = 0; i < arity; ++i) {
866 ir_node *pred = get_Block_cfgpred_block(block, i);
867 workset_t *pred_end_workset = get_block_info(pred)->end_workset;
870 DB((dbg, DBG_FIX, " Pred %+F\n", pred));
872 /* spill all values not used anymore */
873 workset_foreach(pred_end_workset, node, iter) {
877 workset_foreach(start_workset, n2, iter2) {
882 /* note that we do not look at phi inputs, becuase the values
883 * will be either live-end and need no spill or
884 * they have other users in which must be somewhere else in the
891 if (move_spills && be_is_live_in(lv, block, node)
892 && !pred_end_workset->vals[iter].spilled) {
893 ir_node *insert_point;
895 insert_point = be_get_end_of_block_insertion_point(pred);
896 insert_point = sched_prev(insert_point);
898 insert_point = block;
900 DB((dbg, DBG_SPILL, "Spill %+F after %+F\n", node,
902 be_add_spill(senv, node, insert_point);
906 /* reload missing values in predecessors, add missing spills */
907 workset_foreach(start_workset, node, iter) {
908 const loc_t *l = &start_workset->vals[iter];
909 const loc_t *pred_loc;
911 /* if node is a phi of the current block we reload
912 * the corresponding argument, else node itself */
913 if (is_Phi(node) && get_nodes_block(node) == block) {
914 node = get_irn_n(node, i);
917 /* we might have unknowns as argument for the phi */
918 if (!arch_irn_consider_in_reg_alloc(cls, node))
922 /* check if node is in a register at end of pred */
923 pred_loc = workset_contains(pred_end_workset, node);
924 if (pred_loc != NULL) {
925 /* we might have to spill value on this path */
926 if (move_spills && !pred_loc->spilled && l->spilled) {
927 ir_node *insert_point
928 = be_get_end_of_block_insertion_point(pred);
929 insert_point = sched_prev(insert_point);
930 DB((dbg, DBG_SPILL, "Spill %+F after %+F\n", node,
932 be_add_spill(senv, node, insert_point);
935 /* node is not in register at the end of pred -> reload it */
936 DB((dbg, DBG_FIX, " reload %+F\n", node));
937 DB((dbg, DBG_SPILL, "Reload %+F before %+F,%d\n", node, block, i));
938 be_add_reload_on_edge(senv, node, block, i, cls, 1);
944 static void be_spill_belady(ir_graph *irg, const arch_register_class_t *rcls)
948 be_liveness_assure_sets(be_assure_liveness(irg));
951 /* construct control flow loop tree */
952 if (! (get_irg_loopinfo_state(irg) & loopinfo_cf_consistent)) {
953 construct_cf_backedges(irg);
955 stat_ev_tim_pop("belady_time_backedges");
959 stat_ev_tim_pop("belady_time_clear_links");
961 ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
963 /* init belady env */
967 lv = be_get_irg_liveness(irg);
968 n_regs = be_get_n_allocatable_regs(irg, cls);
970 uses = be_begin_uses(irg, lv);
971 loop_ana = be_new_loop_pressure(irg, cls);
972 senv = be_new_spill_env(irg);
973 blocklist = be_get_cfgpostorder(irg);
974 stat_ev_tim_pop("belady_time_init");
977 /* walk blocks in reverse postorder */
978 for (i = ARR_LEN(blocklist) - 1; i >= 0; --i) {
979 process_block(blocklist[i]);
981 DEL_ARR_F(blocklist);
982 stat_ev_tim_pop("belady_time_belady");
985 /* belady was block-local, fix the global flow by adding reloads on the
987 irg_block_walk_graph(irg, fix_block_borders, NULL, NULL);
988 stat_ev_tim_pop("belady_time_fix_borders");
990 ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
992 /* Insert spill/reload nodes into the graph and fix usages */
993 be_insert_spills_reloads(senv);
996 be_delete_spill_env(senv);
998 be_free_loop_pressure(loop_ana);
999 obstack_free(&obst, NULL);
1002 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_spillbelady)
1003 void be_init_spillbelady(void)
1005 static be_spiller_t belady_spiller = {
1008 lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
1009 lc_opt_entry_t *belady_group = lc_opt_get_grp(be_grp, "belady");
1010 lc_opt_add_table(belady_group, options);
1012 be_register_spiller("belady", &belady_spiller);
1013 FIRM_DBG_REGISTER(dbg, "firm.be.spill.belady");