3 * File name: ir/ir/irgopt.c
4 * Purpose: Optimizations for a whole ir graph, i.e., a procedure.
5 * Author: Christian Schaefer, Goetz Lindenmaier
6 * Modified by: Sebastian Felis
9 * Copyright: (c) 1998-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
23 # include "irnode_t.h"
24 # include "irgraph_t.h"
32 # include "pdeq.h" /* Fuer code placement */
35 # include "irbackedge_t.h"
36 # include "irflag_t.h"
37 # include "firmstat.h"
39 /* Defined in iropt.c */
40 pset *new_identities (void);
41 void del_identities (pset *value_table);
42 void add_identities (pset *value_table, ir_node *node);
44 /*------------------------------------------------------------------*/
45 /* apply optimizations of iropt to all nodes. */
46 /*------------------------------------------------------------------*/
48 static void init_link (ir_node *n, void *env) {
49 set_irn_link(n, NULL);
52 #if 0 /* Old version. Avoids Ids.
53 This is not necessary: we do a postwalk, and get_irn_n
54 removes ids anyways. So it's much cheaper to call the
55 optimization less often and use the exchange() algorithm. */
57 optimize_in_place_wrapper (ir_node *n, void *env) {
59 ir_node *optimized, *old;
61 irn_arity = intern_get_irn_arity(n);
62 for (i = 0; i < irn_arity; i++) {
63 /* get_irn_n skips Id nodes, so comparison old != optimized does not
64 show all optimizations. Therefore always set new predecessor. */
65 old = intern_get_irn_intra_n(n, i);
66 optimized = optimize_in_place_2(old);
67 set_irn_n(n, i, optimized);
70 if (intern_get_irn_op(n) == op_Block) {
71 optimized = optimize_in_place_2(n);
72 if (optimized != n) exchange (n, optimized);
77 optimize_in_place_wrapper (ir_node *n, void *env) {
78 ir_node *optimized = optimize_in_place_2(n);
79 if (optimized != n) exchange (n, optimized);
86 local_optimize_graph (ir_graph *irg) {
87 ir_graph *rem = current_ir_graph;
88 current_ir_graph = irg;
90 /* Handle graph state */
91 assert(get_irg_phase_state(irg) != phase_building);
92 if (get_opt_global_cse())
93 set_irg_pinned(current_ir_graph, floats);
94 if (get_irg_outs_state(current_ir_graph) == outs_consistent)
95 set_irg_outs_inconsistent(current_ir_graph);
96 if (get_irg_dom_state(current_ir_graph) == dom_consistent)
97 set_irg_dom_inconsistent(current_ir_graph);
99 /* Clean the value_table in irg for the cse. */
100 del_identities(irg->value_table);
101 irg->value_table = new_identities();
103 /* walk over the graph */
104 irg_walk(irg->end, init_link, optimize_in_place_wrapper, NULL);
106 current_ir_graph = rem;
109 /*------------------------------------------------------------------*/
110 /* Routines for dead node elimination / copying garbage collection */
111 /* of the obstack. */
112 /*------------------------------------------------------------------*/
115 * Remember the new node in the old node by using a field all nodes have.
118 set_new_node (ir_node *old, ir_node *new)
124 * Get this new node, before the old node is forgotton.
126 static INLINE ir_node *
127 get_new_node (ir_node * n)
133 * We use the block_visited flag to mark that we have computed the
134 * number of useful predecessors for this block.
135 * Further we encode the new arity in this flag in the old blocks.
136 * Remembering the arity is useful, as it saves a lot of pointer
137 * accesses. This function is called for all Phi and Block nodes
141 compute_new_arity(ir_node *b) {
142 int i, res, irn_arity;
145 irg_v = get_irg_block_visited(current_ir_graph);
146 block_v = get_Block_block_visited(b);
147 if (block_v >= irg_v) {
148 /* we computed the number of preds for this block and saved it in the
150 return block_v - irg_v;
152 /* compute the number of good predecessors */
153 res = irn_arity = intern_get_irn_arity(b);
154 for (i = 0; i < irn_arity; i++)
155 if (intern_get_irn_opcode(intern_get_irn_n(b, i)) == iro_Bad) res--;
156 /* save it in the flag. */
157 set_Block_block_visited(b, irg_v + res);
162 /* TODO: add an ir_op operation */
163 static INLINE void new_backedge_info(ir_node *n) {
164 switch(intern_get_irn_opcode(n)) {
166 n->attr.block.cg_backedge = NULL;
167 n->attr.block.backedge = new_backedge_arr(current_ir_graph->obst, intern_get_irn_arity(n));
170 n->attr.phi_backedge = new_backedge_arr(current_ir_graph->obst, intern_get_irn_arity(n));
173 n->attr.filter.backedge = new_backedge_arr(current_ir_graph->obst, intern_get_irn_arity(n));
180 * Copies the node to the new obstack. The Ins of the new node point to
181 * the predecessors on the old obstack. For block/phi nodes not all
182 * predecessors might be copied. n->link points to the new node.
183 * For Phi and Block nodes the function allocates in-arrays with an arity
184 * only for useful predecessors. The arity is determined by counting
185 * the non-bad predecessors of the block.
188 copy_node (ir_node *n, void *env) {
192 /* The end node looses it's flexible in array. This doesn't matter,
193 as dead node elimination builds End by hand, inlineing doesn't use
195 /* assert(n->op == op_End || ((_ARR_DESCR(n->in))->cookie != ARR_F_MAGIC)); */
197 if (intern_get_irn_opcode(n) == iro_Block) {
199 new_arity = compute_new_arity(n);
200 n->attr.block.graph_arr = NULL;
202 block = get_nodes_Block(n);
203 if (intern_get_irn_opcode(n) == iro_Phi) {
204 new_arity = compute_new_arity(block);
206 new_arity = intern_get_irn_arity(n);
209 nn = new_ir_node(get_irn_dbg_info(n),
212 intern_get_irn_op(n),
213 intern_get_irn_mode(n),
216 /* Copy the attributes. These might point to additional data. If this
217 was allocated on the old obstack the pointers now are dangling. This
218 frees e.g. the memory of the graph_arr allocated in new_immBlock. */
220 new_backedge_info(nn);
223 /* printf("\n old node: "); DDMSG2(n);
224 printf(" new node: "); DDMSG2(nn); */
229 * Copies new predecessors of old node to new node remembered in link.
230 * Spare the Bad predecessors of Phi and Block nodes.
233 copy_preds (ir_node *n, void *env) {
237 nn = get_new_node(n);
239 /* printf("\n old node: "); DDMSG2(n);
240 printf(" new node: "); DDMSG2(nn);
241 printf(" arities: old: %d, new: %d\n", intern_get_irn_arity(n), intern_get_irn_arity(nn)); */
243 if (intern_get_irn_opcode(n) == iro_Block) {
244 /* Don't copy Bad nodes. */
246 irn_arity = intern_get_irn_arity(n);
247 for (i = 0; i < irn_arity; i++)
248 if (intern_get_irn_opcode(intern_get_irn_n(n, i)) != iro_Bad) {
249 set_irn_n (nn, j, get_new_node(intern_get_irn_n(n, i)));
250 /*if (is_backedge(n, i)) set_backedge(nn, j);*/
253 /* repair the block visited flag from above misuse. Repair it in both
254 graphs so that the old one can still be used. */
255 set_Block_block_visited(nn, 0);
256 set_Block_block_visited(n, 0);
257 /* Local optimization could not merge two subsequent blocks if
258 in array contained Bads. Now it's possible.
259 We don't call optimize_in_place as it requires
260 that the fields in ir_graph are set properly. */
261 if ((get_opt_control_flow_straightening()) &&
262 (get_Block_n_cfgpreds(nn) == 1) &&
263 (intern_get_irn_op(get_Block_cfgpred(nn, 0)) == op_Jmp))
264 exchange(nn, get_nodes_Block(get_Block_cfgpred(nn, 0)));
265 } else if (intern_get_irn_opcode(n) == iro_Phi) {
266 /* Don't copy node if corresponding predecessor in block is Bad.
267 The Block itself should not be Bad. */
268 block = get_nodes_Block(n);
269 set_irn_n (nn, -1, get_new_node(block));
271 irn_arity = intern_get_irn_arity(n);
272 for (i = 0; i < irn_arity; i++)
273 if (intern_get_irn_opcode(intern_get_irn_n(block, i)) != iro_Bad) {
274 set_irn_n (nn, j, get_new_node(intern_get_irn_n(n, i)));
275 /*if (is_backedge(n, i)) set_backedge(nn, j);*/
278 /* If the pre walker reached this Phi after the post walker visited the
279 block block_visited is > 0. */
280 set_Block_block_visited(get_nodes_Block(n), 0);
281 /* Compacting the Phi's ins might generate Phis with only one
283 if (intern_get_irn_arity(n) == 1)
284 exchange(n, intern_get_irn_n(n, 0));
286 irn_arity = intern_get_irn_arity(n);
287 for (i = -1; i < irn_arity; i++)
288 set_irn_n (nn, i, get_new_node(intern_get_irn_n(n, i)));
290 /* Now the new node is complete. We can add it to the hash table for cse.
291 @@@ inlinening aborts if we identify End. Why? */
292 if(intern_get_irn_op(nn) != op_End)
293 add_identities (current_ir_graph->value_table, nn);
297 * Copies the graph recursively, compacts the keepalive of the end node.
301 ir_node *oe, *ne; /* old end, new end */
302 ir_node *ka; /* keep alive */
305 oe = get_irg_end(current_ir_graph);
306 /* copy the end node by hand, allocate dynamic in array! */
307 ne = new_ir_node(get_irn_dbg_info(oe),
314 /* Copy the attributes. Well, there might be some in the future... */
316 set_new_node(oe, ne);
318 /* copy the live nodes */
319 irg_walk(get_nodes_Block(oe), copy_node, copy_preds, NULL);
320 /* copy_preds for the end node ... */
321 set_nodes_Block(ne, get_new_node(get_nodes_Block(oe)));
323 /*- ... and now the keep alives. -*/
324 /* First pick the not marked block nodes and walk them. We must pick these
325 first as else we will oversee blocks reachable from Phis. */
326 irn_arity = intern_get_irn_arity(oe);
327 for (i = 0; i < irn_arity; i++) {
328 ka = intern_get_irn_intra_n(oe, i);
329 if ((intern_get_irn_op(ka) == op_Block) &&
330 (get_irn_visited(ka) < get_irg_visited(current_ir_graph))) {
331 /* We must keep the block alive and copy everything reachable */
332 set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
333 irg_walk(ka, copy_node, copy_preds, NULL);
334 add_End_keepalive(ne, get_new_node(ka));
338 /* Now pick the Phis. Here we will keep all! */
339 irn_arity = intern_get_irn_arity(oe);
340 for (i = 0; i < irn_arity; i++) {
341 ka = intern_get_irn_intra_n(oe, i);
342 if ((intern_get_irn_op(ka) == op_Phi)) {
343 if (get_irn_visited(ka) < get_irg_visited(current_ir_graph)) {
344 /* We didn't copy the Phi yet. */
345 set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
346 irg_walk(ka, copy_node, copy_preds, NULL);
348 add_End_keepalive(ne, get_new_node(ka));
354 * Copies the graph reachable from current_ir_graph->end to the obstack
355 * in current_ir_graph and fixes the environment.
356 * Then fixes the fields in current_ir_graph containing nodes of the
360 copy_graph_env (void) {
362 /* Not all nodes remembered in current_ir_graph might be reachable
363 from the end node. Assure their link is set to NULL, so that
364 we can test whether new nodes have been computed. */
365 set_irn_link(get_irg_frame (current_ir_graph), NULL);
366 set_irn_link(get_irg_globals(current_ir_graph), NULL);
367 set_irn_link(get_irg_args (current_ir_graph), NULL);
369 /* we use the block walk flag for removing Bads from Blocks ins. */
370 inc_irg_block_visited(current_ir_graph);
375 /* fix the fields in current_ir_graph */
376 old_end = get_irg_end(current_ir_graph);
377 set_irg_end (current_ir_graph, get_new_node(old_end));
378 set_irg_end_except (current_ir_graph, get_irg_end(current_ir_graph));
379 set_irg_end_reg (current_ir_graph, get_irg_end(current_ir_graph));
381 set_irg_end_block (current_ir_graph, get_new_node(get_irg_end_block(current_ir_graph)));
382 if (get_irn_link(get_irg_frame(current_ir_graph)) == NULL) {
383 copy_node (get_irg_frame(current_ir_graph), NULL);
384 copy_preds(get_irg_frame(current_ir_graph), NULL);
386 if (get_irn_link(get_irg_globals(current_ir_graph)) == NULL) {
387 copy_node (get_irg_globals(current_ir_graph), NULL);
388 copy_preds(get_irg_globals(current_ir_graph), NULL);
390 if (get_irn_link(get_irg_args(current_ir_graph)) == NULL) {
391 copy_node (get_irg_args(current_ir_graph), NULL);
392 copy_preds(get_irg_args(current_ir_graph), NULL);
394 set_irg_start (current_ir_graph, get_new_node(get_irg_start(current_ir_graph)));
396 set_irg_start_block(current_ir_graph,
397 get_new_node(get_irg_start_block(current_ir_graph)));
398 set_irg_frame (current_ir_graph, get_new_node(get_irg_frame(current_ir_graph)));
399 set_irg_globals(current_ir_graph, get_new_node(get_irg_globals(current_ir_graph)));
400 set_irg_args (current_ir_graph, get_new_node(get_irg_args(current_ir_graph)));
401 if (get_irn_link(get_irg_bad(current_ir_graph)) == NULL) {
402 copy_node(get_irg_bad(current_ir_graph), NULL);
403 copy_preds(get_irg_bad(current_ir_graph), NULL);
405 set_irg_bad(current_ir_graph, get_new_node(get_irg_bad(current_ir_graph)));
406 /* GL removed: we need unknown with mode for analyses.
407 if (get_irn_link(get_irg_unknown(current_ir_graph)) == NULL) {
408 copy_node(get_irg_unknown(current_ir_graph), NULL);
409 copy_preds(get_irg_unknown(current_ir_graph), NULL);
411 set_irg_unknown(current_ir_graph, get_new_node(get_irg_unknown(current_ir_graph)));
416 * Copies all reachable nodes to a new obstack. Removes bad inputs
417 * from block nodes and the corresponding inputs from Phi nodes.
418 * Merges single exit blocks with single entry blocks and removes
420 * Adds all new nodes to a new hash table for cse. Does not
421 * perform cse, so the hash table might contain common subexpressions.
423 /* Amroq call this emigrate() */
425 dead_node_elimination(ir_graph *irg) {
427 int rem_ipview = interprocedural_view;
428 struct obstack *graveyard_obst = NULL;
429 struct obstack *rebirth_obst = NULL;
431 stat_dead_node_elim_start(irg);
433 /* Remember external state of current_ir_graph. */
434 rem = current_ir_graph;
435 current_ir_graph = irg;
436 interprocedural_view = 0;
438 /* Handle graph state */
439 assert(get_irg_phase_state(current_ir_graph) != phase_building);
440 assert(get_irg_callee_info_state(current_ir_graph) == irg_callee_info_none);
441 free_outs(current_ir_graph);
443 /* @@@ so far we loose loops when copying */
444 free_loop_information(current_ir_graph);
446 if (get_opt_optimize() && get_opt_dead_node_elimination()) {
448 /* A quiet place, where the old obstack can rest in peace,
449 until it will be cremated. */
450 graveyard_obst = irg->obst;
452 /* A new obstack, where the reachable nodes will be copied to. */
453 rebirth_obst = (struct obstack *) xmalloc (sizeof (struct obstack));
454 current_ir_graph->obst = rebirth_obst;
455 obstack_init (current_ir_graph->obst);
457 /* We also need a new hash table for cse */
458 del_identities (irg->value_table);
459 irg->value_table = new_identities ();
461 /* Copy the graph from the old to the new obstack */
464 /* Free memory from old unoptimized obstack */
465 obstack_free(graveyard_obst, 0); /* First empty the obstack ... */
466 xfree (graveyard_obst); /* ... then free it. */
469 stat_dead_node_elim_stop(irg);
471 current_ir_graph = rem;
472 interprocedural_view = rem_ipview;
476 * Relink bad predeseccors of a block and store the old in array to the
477 * link field. This function is called by relink_bad_predecessors().
478 * The array of link field starts with the block operand at position 0.
479 * If block has bad predecessors, create a new in array without bad preds.
480 * Otherwise let in array untouched.
482 static void relink_bad_block_predecessors(ir_node *n, void *env) {
483 ir_node **new_in, *irn;
484 int i, new_irn_n, old_irn_arity, new_irn_arity = 0;
486 /* if link field of block is NULL, look for bad predecessors otherwise
487 this is allready done */
488 if (intern_get_irn_op(n) == op_Block &&
489 get_irn_link(n) == NULL) {
491 /* save old predecessors in link field (position 0 is the block operand)*/
492 set_irn_link(n, (void *)get_irn_in(n));
494 /* count predecessors without bad nodes */
495 old_irn_arity = intern_get_irn_arity(n);
496 for (i = 0; i < old_irn_arity; i++)
497 if (!is_Bad(intern_get_irn_n(n, i))) new_irn_arity++;
499 /* arity changing: set new predecessors without bad nodes */
500 if (new_irn_arity < old_irn_arity) {
501 /* get new predecessor array without Block predecessor */
502 new_in = NEW_ARR_D (ir_node *, current_ir_graph->obst, (new_irn_arity+1));
504 /* set new predeseccors in array */
507 for (i = 1; i < old_irn_arity; i++) {
508 irn = intern_get_irn_n(n, i);
509 if (!is_Bad(irn)) new_in[new_irn_n++] = irn;
512 } /* ir node has bad predecessors */
514 } /* Block is not relinked */
518 * Relinks Bad predecesors from Bocks and Phis called by walker
519 * remove_bad_predecesors(). If n is a Block, call
520 * relink_bad_block_redecessors(). If n is a Phinode, call also the relinking
521 * function of Phi's Block. If this block has bad predecessors, relink preds
524 static void relink_bad_predecessors(ir_node *n, void *env) {
525 ir_node *block, **old_in;
526 int i, old_irn_arity, new_irn_arity;
528 /* relink bad predeseccors of a block */
529 if (intern_get_irn_op(n) == op_Block)
530 relink_bad_block_predecessors(n, env);
532 /* If Phi node relink its block and its predecessors */
533 if (intern_get_irn_op(n) == op_Phi) {
535 /* Relink predeseccors of phi's block */
536 block = get_nodes_Block(n);
537 if (get_irn_link(block) == NULL)
538 relink_bad_block_predecessors(block, env);
540 old_in = (ir_node **)get_irn_link(block); /* Of Phi's Block */
541 old_irn_arity = ARR_LEN(old_in);
543 /* Relink Phi predeseccors if count of predeseccors changed */
544 if (old_irn_arity != ARR_LEN(get_irn_in(block))) {
545 /* set new predeseccors in array
546 n->in[0] remains the same block */
548 for(i = 1; i < old_irn_arity; i++)
549 if (!is_Bad((ir_node *)old_in[i])) n->in[new_irn_arity++] = n->in[i];
551 ARR_SETLEN(ir_node *, n->in, new_irn_arity);
554 } /* n is a Phi node */
558 * Removes Bad Bad predecesors from Blocks and the corresponding
559 * inputs to Phi nodes as in dead_node_elimination but without
561 * On walking up set the link field to NULL, on walking down call
562 * relink_bad_predecessors() (This function stores the old in array
563 * to the link field and sets a new in array if arity of predecessors
566 void remove_bad_predecessors(ir_graph *irg) {
567 irg_walk_graph(irg, init_link, relink_bad_predecessors, NULL);
571 /*--------------------------------------------------------------------*/
572 /* Funcionality for inlining */
573 /*--------------------------------------------------------------------*/
576 * Copy node for inlineing. Updates attributes that change when
577 * inlineing but not for dead node elimination.
579 * Copies the node by calling copy_node and then updates the entity if
580 * it's a local one. env must be a pointer of the frame type of the
581 * inlined procedure. The new entities must be in the link field of
585 copy_node_inline (ir_node *n, void *env) {
587 type *frame_tp = (type *)env;
590 if (intern_get_irn_op(n) == op_Sel) {
591 new = get_new_node (n);
592 assert(intern_get_irn_op(new) == op_Sel);
593 if (get_entity_owner(get_Sel_entity(n)) == frame_tp) {
594 set_Sel_entity(new, get_entity_link(get_Sel_entity(n)));
596 } else if (intern_get_irn_op(n) == op_Block) {
597 new = get_new_node (n);
598 new->attr.block.irg = current_ir_graph;
602 static void find_addr(ir_node *node, void *env)
604 if (get_irn_opcode(node) == iro_Proj) {
605 if (get_Proj_proj(node) == pn_Start_P_value_arg_base)
611 * currently, we cannot inline two cases:
612 * - call with compound arguments
613 * - graphs that take the address of a parameter
615 * check these condition here
617 static int can_inline(ir_node *call, ir_graph *called_graph)
619 type *call_type = get_Call_type(call);
620 int params, ress, i, res;
622 assert(is_method_type(call_type));
624 params = get_method_n_params(call_type);
625 ress = get_method_n_ress(call_type);
628 for (i = 0; i < params; ++i) {
629 type *p_type = get_method_param_type(call_type, i);
631 if (is_compound_type(p_type))
636 for (i = 0; i < ress; ++i) {
637 type *r_type = get_method_res_type(call_type, i);
639 if (is_compound_type(r_type))
644 irg_walk_graph(called_graph, find_addr, NULL, &res);
649 void inline_method(ir_node *call, ir_graph *called_graph) {
651 ir_node *post_call, *post_bl;
653 ir_node *end, *end_bl;
657 int arity, n_ret, n_exc, n_res, i, j, rem_opt, irn_arity;
660 irg_inline_property prop = get_irg_inline_property(called_graph);
662 if ( (prop != irg_inline_forced) && (!get_opt_optimize() || !get_opt_inline() ||
663 (prop == irg_inline_forbidden))) return;
667 * currently, we cannot inline two cases:
668 * - call with compound arguments
669 * - graphs that take the address of a parameter
671 if (! can_inline(call, called_graph))
674 /* -- Turn off optimizations, this can cause problems when allocating new nodes. -- */
675 rem_opt = get_opt_optimize();
678 /* Handle graph state */
679 assert(get_irg_phase_state(current_ir_graph) != phase_building);
680 assert(get_irg_pinned(current_ir_graph) == pinned);
681 assert(get_irg_pinned(called_graph) == pinned);
682 if (get_irg_outs_state(current_ir_graph) == outs_consistent)
683 set_irg_outs_inconsistent(current_ir_graph);
685 /* -- Check preconditions -- */
686 assert(get_irn_op(call) == op_Call);
687 /* @@@ does not work for InterfaceIII.java after cgana
688 assert(get_Call_type(call) == get_entity_type(get_irg_ent(called_graph)));
689 assert(smaller_type(get_entity_type(get_irg_ent(called_graph)),
690 get_Call_type(call)));
692 assert(get_type_tpop(get_Call_type(call)) == type_method);
693 if (called_graph == current_ir_graph) {
694 set_optimize(rem_opt);
698 /* here we know we WILL inline, so inform the statistics */
699 stat_inline(call, called_graph);
701 /* -- Decide how to handle exception control flow: Is there a handler
702 for the Call node, or do we branch directly to End on an exception?
703 exc_handling: 0 There is a handler.
705 2 Exception handling not represented in Firm. -- */
707 ir_node *proj, *Mproj = NULL, *Xproj = NULL;
708 for (proj = (ir_node *)get_irn_link(call); proj; proj = (ir_node *)get_irn_link(proj)) {
709 assert(get_irn_op(proj) == op_Proj);
710 if (get_Proj_proj(proj) == pn_Call_X_except) Xproj = proj;
711 if (get_Proj_proj(proj) == pn_Call_M_except) Mproj = proj;
713 if (Mproj) { assert(Xproj); exc_handling = 0; } /* Mproj */
714 else if (Xproj) { exc_handling = 1; } /* !Mproj && Xproj */
715 else { exc_handling = 2; } /* !Mproj && !Xproj */
720 the procedure and later replaces the Start node of the called graph.
721 Post_call is the old Call node and collects the results of the called
722 graph. Both will end up being a tuple. -- */
723 post_bl = get_nodes_Block(call);
724 set_irg_current_block(current_ir_graph, post_bl);
725 /* XxMxPxP of Start + parameter of Call */
726 in[pn_Start_X_initial_exec] = new_Jmp();
727 in[pn_Start_M] = get_Call_mem(call);
728 in[pn_Start_P_frame_base] = get_irg_frame(current_ir_graph);
729 in[pn_Start_P_globals] = get_irg_globals(current_ir_graph);
730 in[pn_Start_T_arg] = new_Tuple(get_Call_n_params(call), get_Call_param_arr(call));
731 /* in[pn_Start_P_value_arg_base] = ??? */
732 pre_call = new_Tuple(5, in);
736 The new block gets the ins of the old block, pre_call and all its
737 predecessors and all Phi nodes. -- */
738 part_block(pre_call);
740 /* -- Prepare state for dead node elimination -- */
741 /* Visited flags in calling irg must be >= flag in called irg.
742 Else walker and arity computation will not work. */
743 if (get_irg_visited(current_ir_graph) <= get_irg_visited(called_graph))
744 set_irg_visited(current_ir_graph, get_irg_visited(called_graph)+1);
745 if (get_irg_block_visited(current_ir_graph)< get_irg_block_visited(called_graph))
746 set_irg_block_visited(current_ir_graph, get_irg_block_visited(called_graph));
747 /* Set pre_call as new Start node in link field of the start node of
748 calling graph and pre_calls block as new block for the start block
750 Further mark these nodes so that they are not visited by the
752 set_irn_link(get_irg_start(called_graph), pre_call);
753 set_irn_visited(get_irg_start(called_graph),
754 get_irg_visited(current_ir_graph));
755 set_irn_link(get_irg_start_block(called_graph),
756 get_nodes_Block(pre_call));
757 set_irn_visited(get_irg_start_block(called_graph),
758 get_irg_visited(current_ir_graph));
760 /* Initialize for compaction of in arrays */
761 inc_irg_block_visited(current_ir_graph);
763 /* -- Replicate local entities of the called_graph -- */
764 /* copy the entities. */
765 called_frame = get_irg_frame_type(called_graph);
766 for (i = 0; i < get_class_n_members(called_frame); i++) {
767 entity *new_ent, *old_ent;
768 old_ent = get_class_member(called_frame, i);
769 new_ent = copy_entity_own(old_ent, get_cur_frame_type());
770 set_entity_link(old_ent, new_ent);
773 /* visited is > than that of called graph. With this trick visited will
774 remain unchanged so that an outer walker, e.g., searching the call nodes
775 to inline, calling this inline will not visit the inlined nodes. */
776 set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
778 /* -- Performing dead node elimination inlines the graph -- */
779 /* Copies the nodes to the obstack of current_ir_graph. Updates links to new
781 /* @@@ endless loops are not copied!! -- they should be, I think... */
782 irg_walk(get_irg_end(called_graph), copy_node_inline, copy_preds,
783 get_irg_frame_type(called_graph));
785 /* Repair called_graph */
786 set_irg_visited(called_graph, get_irg_visited(current_ir_graph));
787 set_irg_block_visited(called_graph, get_irg_block_visited(current_ir_graph));
788 set_Block_block_visited(get_irg_start_block(called_graph), 0);
790 /* -- Merge the end of the inlined procedure with the call site -- */
791 /* We will turn the old Call node into a Tuple with the following
794 0: Phi of all Memories of Return statements.
795 1: Jmp from new Block that merges the control flow from all exception
796 predecessors of the old end block.
797 2: Tuple of all arguments.
798 3: Phi of Exception memories.
799 In case the old Call directly branches to End on an exception we don't
800 need the block merging all exceptions nor the Phi of the exception
804 /* -- Precompute some values -- */
805 end_bl = get_new_node(get_irg_end_block(called_graph));
806 end = get_new_node(get_irg_end(called_graph));
807 arity = intern_get_irn_arity(end_bl); /* arity = n_exc + n_ret */
808 n_res = get_method_n_ress(get_Call_type(call));
810 res_pred = (ir_node **) malloc (n_res * sizeof (ir_node *));
811 cf_pred = (ir_node **) malloc (arity * sizeof (ir_node *));
813 set_irg_current_block(current_ir_graph, post_bl); /* just to make sure */
815 /* -- archive keepalives -- */
816 irn_arity = intern_get_irn_arity(end);
817 for (i = 0; i < irn_arity; i++)
818 add_End_keepalive(get_irg_end(current_ir_graph), intern_get_irn_n(end, i));
820 /* The new end node will die. We need not free as the in array is on the obstack:
821 copy_node only generated 'D' arrays. */
823 /* -- Replace Return nodes by Jump nodes. -- */
825 for (i = 0; i < arity; i++) {
827 ret = intern_get_irn_n(end_bl, i);
828 if (intern_get_irn_op(ret) == op_Return) {
829 cf_pred[n_ret] = new_r_Jmp(current_ir_graph, get_nodes_Block(ret));
833 set_irn_in(post_bl, n_ret, cf_pred);
835 /* -- Build a Tuple for all results of the method.
836 Add Phi node if there was more than one Return. -- */
837 turn_into_tuple(post_call, 4);
838 /* First the Memory-Phi */
840 for (i = 0; i < arity; i++) {
841 ret = intern_get_irn_n(end_bl, i);
842 if (intern_get_irn_op(ret) == op_Return) {
843 cf_pred[n_ret] = get_Return_mem(ret);
847 phi = new_Phi(n_ret, cf_pred, mode_M);
848 set_Tuple_pred(call, pn_Call_M_regular, phi);
849 /* Conserve Phi-list for further inlinings -- but might be optimized */
850 if (get_nodes_Block(phi) == post_bl) {
851 set_irn_link(phi, get_irn_link(post_bl));
852 set_irn_link(post_bl, phi);
854 /* Now the real results */
856 for (j = 0; j < n_res; j++) {
858 for (i = 0; i < arity; i++) {
859 ret = intern_get_irn_n(end_bl, i);
860 if (intern_get_irn_op(ret) == op_Return) {
861 cf_pred[n_ret] = get_Return_res(ret, j);
865 phi = new_Phi(n_ret, cf_pred, intern_get_irn_mode(cf_pred[0]));
867 /* Conserve Phi-list for further inlinings -- but might be optimized */
868 if (get_nodes_Block(phi) == post_bl) {
869 set_irn_link(phi, get_irn_link(post_bl));
870 set_irn_link(post_bl, phi);
873 set_Tuple_pred(call, pn_Call_T_result, new_Tuple(n_res, res_pred));
875 set_Tuple_pred(call, pn_Call_T_result, new_Bad());
877 /* Finally the exception control flow.
878 We have two (three) possible situations:
879 First if the Call branches to an exception handler: We need to add a Phi node to
880 collect the memory containing the exception objects. Further we need
881 to add another block to get a correct representation of this Phi. To
882 this block we add a Jmp that resolves into the X output of the Call
883 when the Call is turned into a tuple.
884 Second the Call branches to End, the exception is not handled. Just
885 add all inlined exception branches to the End node.
886 Third: there is no Exception edge at all. Handle as case two. */
887 if (exc_handling == 0) {
889 for (i = 0; i < arity; i++) {
891 ret = intern_get_irn_n(end_bl, i);
892 if (is_fragile_op(skip_Proj(ret)) || (intern_get_irn_op(skip_Proj(ret)) == op_Raise)) {
893 cf_pred[n_exc] = ret;
898 new_Block(n_exc, cf_pred); /* watch it: current_block is changed! */
899 set_Tuple_pred(call, pn_Call_X_except, new_Jmp());
900 /* The Phi for the memories with the exception objects */
902 for (i = 0; i < arity; i++) {
904 ret = skip_Proj(intern_get_irn_n(end_bl, i));
905 if (intern_get_irn_op(ret) == op_Call) {
906 cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_Block(ret), ret, mode_M, 3);
908 } else if (is_fragile_op(ret)) {
909 /* We rely that all cfops have the memory output at the same position. */
910 cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_Block(ret), ret, mode_M, 0);
912 } else if (intern_get_irn_op(ret) == op_Raise) {
913 cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_Block(ret), ret, mode_M, 1);
917 set_Tuple_pred(call, pn_Call_M_except, new_Phi(n_exc, cf_pred, mode_M));
919 set_Tuple_pred(call, pn_Call_X_except, new_Bad());
920 set_Tuple_pred(call, pn_Call_M_except, new_Bad());
923 ir_node *main_end_bl;
924 int main_end_bl_arity;
927 /* assert(exc_handling == 1 || no exceptions. ) */
929 for (i = 0; i < arity; i++) {
930 ir_node *ret = intern_get_irn_n(end_bl, i);
932 if (is_fragile_op(skip_Proj(ret)) || (intern_get_irn_op(skip_Proj(ret)) == op_Raise)) {
933 cf_pred[n_exc] = ret;
937 main_end_bl = get_irg_end_block(current_ir_graph);
938 main_end_bl_arity = intern_get_irn_arity(main_end_bl);
939 end_preds = (ir_node **) malloc ((n_exc + main_end_bl_arity) * sizeof (ir_node *));
941 for (i = 0; i < main_end_bl_arity; ++i)
942 end_preds[i] = intern_get_irn_n(main_end_bl, i);
943 for (i = 0; i < n_exc; ++i)
944 end_preds[main_end_bl_arity + i] = cf_pred[i];
945 set_irn_in(main_end_bl, n_exc + main_end_bl_arity, end_preds);
946 set_Tuple_pred(call, pn_Call_X_except, new_Bad());
947 set_Tuple_pred(call, pn_Call_X_except, new_Bad());
953 #if 0 /* old. now better, correcter, faster implementation. */
955 /* -- If the exception control flow from the inlined Call directly
956 branched to the end block we now have the following control
957 flow predecessor pattern: ProjX -> Tuple -> Jmp. We must
958 remove the Jmp along with it's empty block and add Jmp's
959 predecessors as predecessors of this end block. No problem if
960 there is no exception, because then branches Bad to End which
962 @@@ can't we know this beforehand: by getting the Proj(1) from
963 the Call link list and checking whether it goes to Proj. */
964 /* find the problematic predecessor of the end block. */
965 end_bl = get_irg_end_block(current_ir_graph);
966 for (i = 0; i < get_Block_n_cfgpreds(end_bl); i++) {
967 cf_op = get_Block_cfgpred(end_bl, i);
968 if (intern_get_irn_op(cf_op) == op_Proj) {
969 cf_op = get_Proj_pred(cf_op);
970 if ((intern_get_irn_op(cf_op) == op_Tuple) && (cf_op == call)) {
971 /* There are unoptimized tuples from inlineing before when no exc */
972 assert(get_Proj_proj(get_Block_cfgpred(end_bl, i)) == pn_Call_X_except);
973 cf_op = get_Tuple_pred(cf_op, pn_Call_X_except);
974 assert(intern_get_irn_op(cf_op) == op_Jmp);
980 if (i < get_Block_n_cfgpreds(end_bl)) {
981 bl = get_nodes_Block(cf_op);
982 arity = get_Block_n_cfgpreds(end_bl) + get_Block_n_cfgpreds(bl) - 1;
983 cf_pred = (ir_node **) malloc (arity * sizeof (ir_node *));
984 for (j = 0; j < i; j++)
985 cf_pred[j] = get_Block_cfgpred(end_bl, j);
986 for (j = j; j < i + get_Block_n_cfgpreds(bl); j++)
987 cf_pred[j] = get_Block_cfgpred(bl, j-i);
988 for (j = j; j < arity; j++)
989 cf_pred[j] = get_Block_cfgpred(end_bl, j-get_Block_n_cfgpreds(bl) +1);
990 set_irn_in(end_bl, arity, cf_pred);
992 /* Remove the exception pred from post-call Tuple. */
993 set_Tuple_pred(call, pn_Call_X_except, new_Bad());
998 /* -- Turn cse back on. -- */
999 set_optimize(rem_opt);
1002 /********************************************************************/
1003 /* Apply inlineing to small methods. */
1004 /********************************************************************/
1008 /* It makes no sense to inline too many calls in one procedure. Anyways,
1009 I didn't get a version with NEW_ARR_F to run. */
1010 #define MAX_INLINE 1024
1013 * Returns the irg called from a Call node. If the irg is not
1014 * known, NULL is returned.
1016 static ir_graph *get_call_called_irg(ir_node *call) {
1019 ir_graph *called_irg = NULL;
1021 assert(get_irn_op(call) == op_Call);
1023 addr = get_Call_ptr(call);
1024 if (intern_get_irn_op(addr) == op_Const) {
1025 /* Check whether the constant is the pointer to a compiled entity. */
1026 tv = get_Const_tarval(addr);
1027 if (tarval_to_entity(tv))
1028 called_irg = get_entity_irg(tarval_to_entity(tv));
1033 static void collect_calls(ir_node *call, void *env) {
1035 ir_node **calls = (ir_node **)env;
1038 ir_graph *called_irg;
1040 if (intern_get_irn_op(call) != op_Call) return;
1042 addr = get_Call_ptr(call);
1043 if (intern_get_irn_op(addr) == op_Const) {
1044 /* Check whether the constant is the pointer to a compiled entity. */
1045 tv = get_Const_tarval(addr);
1046 if (tarval_to_entity(tv)) {
1047 called_irg = get_entity_irg(tarval_to_entity(tv));
1048 if (called_irg && pos < MAX_INLINE) {
1049 /* The Call node calls a locally defined method. Remember to inline. */
1058 * Inlines all small methods at call sites where the called address comes
1059 * from a Const node that references the entity representing the called
1061 * The size argument is a rough measure for the code size of the method:
1062 * Methods where the obstack containing the firm graph is smaller than
1065 void inline_small_irgs(ir_graph *irg, int size) {
1067 ir_node *calls[MAX_INLINE];
1068 ir_graph *rem = current_ir_graph;
1070 if (!(get_opt_optimize() && get_opt_inline())) return;
1072 current_ir_graph = irg;
1073 /* Handle graph state */
1074 assert(get_irg_phase_state(current_ir_graph) != phase_building);
1075 assert(get_irg_callee_info_state(current_ir_graph) == irg_callee_info_none);
1077 /* Find Call nodes to inline.
1078 (We can not inline during a walk of the graph, as inlineing the same
1079 method several times changes the visited flag of the walked graph:
1080 after the first inlineing visited of the callee equals visited of
1081 the caller. With the next inlineing both are increased.) */
1083 irg_walk(get_irg_end(irg), NULL, collect_calls, (void *) calls);
1085 if ((pos > 0) && (pos < MAX_INLINE)) {
1086 /* There are calls to inline */
1087 collect_phiprojs(irg);
1088 for (i = 0; i < pos; i++) {
1091 tv = get_Const_tarval(get_Call_ptr(calls[i]));
1092 callee = get_entity_irg(tarval_to_entity(tv));
1093 if (((_obstack_memory_used(callee->obst) - obstack_room(callee->obst)) < size) ||
1094 (get_irg_inline_property(callee) == irg_inline_forced)) {
1095 inline_method(calls[i], callee);
1100 current_ir_graph = rem;
1104 * Environment for inlining irgs.
1107 int n_nodes; /**< Nodes in graph except Id, Tuple, Proj, Start, End */
1108 int n_nodes_orig; /**< for statistics */
1109 eset *call_nodes; /**< All call nodes in this graph */
1111 int n_call_nodes_orig; /**< for statistics */
1112 int n_callers; /**< Number of known graphs that call this graphs. */
1113 int n_callers_orig; /**< for statistics */
1116 static inline_irg_env *new_inline_irg_env(void) {
1117 inline_irg_env *env = malloc(sizeof(inline_irg_env));
1118 env->n_nodes = -2; /* uncount Start, End */
1119 env->n_nodes_orig = -2; /* uncount Start, End */
1120 env->call_nodes = eset_create();
1121 env->n_call_nodes = 0;
1122 env->n_call_nodes_orig = 0;
1124 env->n_callers_orig = 0;
1128 static void free_inline_irg_env(inline_irg_env *env) {
1129 eset_destroy(env->call_nodes);
1133 static void collect_calls2(ir_node *call, void *env) {
1134 inline_irg_env *x = (inline_irg_env *)env;
1135 ir_op *op = intern_get_irn_op(call);
1138 /* count nodes in irg */
1139 if (op != op_Proj && op != op_Tuple && op != op_Sync) {
1144 if (op != op_Call) return;
1146 /* collect all call nodes */
1147 eset_insert(x->call_nodes, (void *)call);
1149 x->n_call_nodes_orig++;
1151 /* count all static callers */
1152 callee = get_call_called_irg(call);
1154 ((inline_irg_env *)get_irg_link(callee))->n_callers++;
1155 ((inline_irg_env *)get_irg_link(callee))->n_callers_orig++;
1159 INLINE static int is_leave(ir_graph *irg) {
1160 return (((inline_irg_env *)get_irg_link(irg))->n_call_nodes == 0);
1163 INLINE static int is_smaller(ir_graph *callee, int size) {
1164 return (((inline_irg_env *)get_irg_link(callee))->n_nodes < size);
1169 * Inlines small leave methods at call sites where the called address comes
1170 * from a Const node that references the entity representing the called
1172 * The size argument is a rough measure for the code size of the method:
1173 * Methods where the obstack containing the firm graph is smaller than
1176 void inline_leave_functions(int maxsize, int leavesize, int size) {
1177 inline_irg_env *env;
1178 int i, n_irgs = get_irp_n_irgs();
1179 ir_graph *rem = current_ir_graph;
1182 if (!(get_opt_optimize() && get_opt_inline())) return;
1184 /* extend all irgs by a temporary data structure for inlineing. */
1185 for (i = 0; i < n_irgs; ++i)
1186 set_irg_link(get_irp_irg(i), new_inline_irg_env());
1188 /* Precompute information in temporary data structure. */
1189 for (i = 0; i < n_irgs; ++i) {
1190 current_ir_graph = get_irp_irg(i);
1191 assert(get_irg_phase_state(current_ir_graph) != phase_building);
1192 assert(get_irg_callee_info_state(current_ir_graph) == irg_callee_info_none);
1194 irg_walk(get_irg_end(current_ir_graph), NULL, collect_calls2,
1195 get_irg_link(current_ir_graph));
1199 Inline leaves recursively -- we might construct new leaves. */
1200 /* int itercnt = 1; */
1201 while (did_inline) {
1202 /* printf("iteration %d\n", itercnt++); */
1204 for (i = 0; i < n_irgs; ++i) {
1207 int phiproj_computed = 0;
1209 current_ir_graph = get_irp_irg(i);
1210 env = (inline_irg_env *)get_irg_link(current_ir_graph);
1212 /* we can not walk and change a set, nor remove from it.
1214 walkset = env->call_nodes;
1215 env->call_nodes = eset_create();
1216 for (call = eset_first(walkset); call; call = eset_next(walkset)) {
1217 inline_irg_env *callee_env;
1218 ir_graph *callee = get_call_called_irg(call);
1220 if (env->n_nodes > maxsize) break;
1222 ((is_leave(callee) && is_smaller(callee, leavesize)) ||
1223 (get_irg_inline_property(callee) == irg_inline_forced))) {
1224 if (!phiproj_computed) {
1225 phiproj_computed = 1;
1226 collect_phiprojs(current_ir_graph);
1228 callee_env = (inline_irg_env *)get_irg_link(callee);
1229 /* printf(" %s: Inlineing %s.\n", get_entity_name(get_irg_entity(current_ir_graph)), */
1230 /* get_entity_name(get_irg_entity(callee))); */
1231 inline_method(call, callee);
1233 env->n_call_nodes--;
1234 eset_insert_all(env->call_nodes, callee_env->call_nodes);
1235 env->n_call_nodes += callee_env->n_call_nodes;
1236 env->n_nodes += callee_env->n_nodes;
1237 callee_env->n_callers--;
1239 eset_insert(env->call_nodes, call);
1242 eset_destroy(walkset);
1246 /* printf("Non leaves\n"); */
1247 /* inline other small functions. */
1248 for (i = 0; i < n_irgs; ++i) {
1251 int phiproj_computed = 0;
1253 current_ir_graph = get_irp_irg(i);
1254 env = (inline_irg_env *)get_irg_link(current_ir_graph);
1256 /* we can not walk and change a set, nor remove from it.
1258 walkset = env->call_nodes;
1259 env->call_nodes = eset_create();
1260 for (call = eset_first(walkset); call; call = eset_next(walkset)) {
1261 inline_irg_env *callee_env;
1262 ir_graph *callee = get_call_called_irg(call);
1264 if (env->n_nodes > maxsize) break;
1265 if (callee && is_smaller(callee, size)) {
1266 if (!phiproj_computed) {
1267 phiproj_computed = 1;
1268 collect_phiprojs(current_ir_graph);
1270 callee_env = (inline_irg_env *)get_irg_link(callee);
1271 /* printf(" %s: Inlineing %s.\n", get_entity_name(get_irg_entity(current_ir_graph)), */
1272 /* get_entity_name(get_irg_entity(callee))); */
1273 inline_method(call, callee);
1275 env->n_call_nodes--;
1276 eset_insert_all(env->call_nodes, callee_env->call_nodes);
1277 env->n_call_nodes += callee_env->n_call_nodes;
1278 env->n_nodes += callee_env->n_nodes;
1279 callee_env->n_callers--;
1281 eset_insert(env->call_nodes, call);
1284 eset_destroy(walkset);
1287 for (i = 0; i < n_irgs; ++i) {
1288 current_ir_graph = get_irp_irg(i);
1290 env = (inline_irg_env *)get_irg_link(current_ir_graph);
1291 if ((env->n_call_nodes_orig != env->n_call_nodes) ||
1292 (env->n_callers_orig != env->n_callers))
1293 printf("Nodes:%3d ->%3d, calls:%3d ->%3d, callers:%3d ->%3d, -- %s\n",
1294 env->n_nodes_orig, env->n_nodes, env->n_call_nodes_orig, env->n_call_nodes,
1295 env->n_callers_orig, env->n_callers,
1296 get_entity_name(get_irg_entity(current_ir_graph)));
1298 free_inline_irg_env((inline_irg_env *)get_irg_link(current_ir_graph));
1301 current_ir_graph = rem;
1304 /*-----------------------------------------------------------------*/
1305 /* Code Placement. Pins all floating nodes to a block where they */
1306 /* will be executed only if needed. */
1307 /*-----------------------------------------------------------------*/
1310 * Find the earliest correct block for N. --- Place N into the
1311 * same Block as its dominance-deepest Input.
1314 place_floats_early(ir_node *n, pdeq *worklist)
1316 int i, start, irn_arity;
1318 /* we must not run into an infinite loop */
1319 assert (irn_not_visited(n));
1320 mark_irn_visited(n);
1322 /* Place floating nodes. */
1323 if (get_op_pinned(intern_get_irn_op(n)) == floats) {
1325 ir_node *b = new_Bad(); /* The block to place this node in */
1327 assert(intern_get_irn_op(n) != op_Block);
1329 if ((intern_get_irn_op(n) == op_Const) ||
1330 (intern_get_irn_op(n) == op_SymConst) ||
1332 (intern_get_irn_op(n) == op_Unknown)) {
1333 /* These nodes will not be placed by the loop below. */
1334 b = get_irg_start_block(current_ir_graph);
1338 /* find the block for this node. */
1339 irn_arity = intern_get_irn_arity(n);
1340 for (i = 0; i < irn_arity; i++) {
1341 ir_node *dep = intern_get_irn_n(n, i);
1343 if ((irn_not_visited(dep)) &&
1344 (get_op_pinned(intern_get_irn_op(dep)) == floats)) {
1345 place_floats_early(dep, worklist);
1347 /* Because all loops contain at least one pinned node, now all
1348 our inputs are either pinned or place_early has already
1349 been finished on them. We do not have any unfinished inputs! */
1350 dep_block = get_nodes_Block(dep);
1351 if ((!is_Bad(dep_block)) &&
1352 (get_Block_dom_depth(dep_block) > depth)) {
1354 depth = get_Block_dom_depth(dep_block);
1356 /* Avoid that the node is placed in the Start block */
1357 if ((depth == 1) && (get_Block_dom_depth(get_nodes_Block(n)) > 1)) {
1358 b = get_Block_cfg_out(get_irg_start_block(current_ir_graph), 0);
1359 assert(b != get_irg_start_block(current_ir_graph));
1363 set_nodes_Block(n, b);
1366 /* Add predecessors of non floating nodes on worklist. */
1367 start = (intern_get_irn_op(n) == op_Block) ? 0 : -1;
1368 irn_arity = intern_get_irn_arity(n);
1369 for (i = start; i < irn_arity; i++) {
1370 ir_node *pred = intern_get_irn_n(n, i);
1371 if (irn_not_visited(pred)) {
1372 pdeq_putr (worklist, pred);
1378 * Floating nodes form subgraphs that begin at nodes as Const, Load,
1379 * Start, Call and end at pinned nodes as Store, Call. Place_early
1380 * places all floating nodes reachable from its argument through floating
1381 * nodes and adds all beginnings at pinned nodes to the worklist.
1383 static INLINE void place_early(pdeq* worklist) {
1385 inc_irg_visited(current_ir_graph);
1387 /* this inits the worklist */
1388 place_floats_early(get_irg_end(current_ir_graph), worklist);
1390 /* Work the content of the worklist. */
1391 while (!pdeq_empty (worklist)) {
1392 ir_node *n = pdeq_getl (worklist);
1393 if (irn_not_visited(n)) place_floats_early(n, worklist);
1396 set_irg_outs_inconsistent(current_ir_graph);
1397 current_ir_graph->pinned = pinned;
1401 /** deepest common dominance ancestor of DCA and CONSUMER of PRODUCER. */
1403 consumer_dom_dca (ir_node *dca, ir_node *consumer, ir_node *producer)
1405 ir_node *block = NULL;
1407 /* Compute the latest block into which we can place a node so that it is
1409 if (intern_get_irn_op(consumer) == op_Phi) {
1410 /* our consumer is a Phi-node, the effective use is in all those
1411 blocks through which the Phi-node reaches producer */
1413 ir_node *phi_block = get_nodes_Block(consumer);
1414 irn_arity = intern_get_irn_arity(consumer);
1415 for (i = 0; i < irn_arity; i++) {
1416 if (intern_get_irn_n(consumer, i) == producer) {
1417 block = get_nodes_Block(get_Block_cfgpred(phi_block, i));
1421 assert(is_no_Block(consumer));
1422 block = get_nodes_Block(consumer);
1425 /* Compute the deepest common ancestor of block and dca. */
1427 if (!dca) return block;
1428 while (get_Block_dom_depth(block) > get_Block_dom_depth(dca))
1429 block = get_Block_idom(block);
1430 while (get_Block_dom_depth(dca) > get_Block_dom_depth(block))
1431 dca = get_Block_idom(dca);
1432 while (block != dca)
1433 { block = get_Block_idom(block); dca = get_Block_idom(dca); }
1438 static INLINE int get_irn_loop_depth(ir_node *n) {
1439 return get_loop_depth(get_irn_loop(n));
1443 * Move n to a block with less loop depth than it's current block. The
1444 * new block must be dominated by early.
1447 move_out_of_loops (ir_node *n, ir_node *early)
1449 ir_node *best, *dca;
1453 /* Find the region deepest in the dominator tree dominating
1454 dca with the least loop nesting depth, but still dominated
1455 by our early placement. */
1456 dca = get_nodes_Block(n);
1458 while (dca != early) {
1459 dca = get_Block_idom(dca);
1460 if (!dca) break; /* should we put assert(dca)? */
1461 if (get_irn_loop_depth(dca) < get_irn_loop_depth(best)) {
1465 if (best != get_nodes_Block(n)) {
1467 printf("Moving out of loop: "); DDMN(n);
1468 printf(" Outermost block: "); DDMN(early);
1469 printf(" Best block: "); DDMN(best);
1470 printf(" Innermost block: "); DDMN(get_nodes_Block(n));
1472 set_nodes_Block(n, best);
1477 * Find the latest legal block for N and place N into the
1478 * `optimal' Block between the latest and earliest legal block.
1479 * The `optimal' block is the dominance-deepest block of those
1480 * with the least loop-nesting-depth. This places N out of as many
1481 * loops as possible and then makes it as control dependant as
1485 place_floats_late(ir_node *n, pdeq *worklist)
1490 assert (irn_not_visited(n)); /* no multiple placement */
1492 /* no need to place block nodes, control nodes are already placed. */
1493 if ((intern_get_irn_op(n) != op_Block) &&
1495 (intern_get_irn_mode(n) != mode_X)) {
1496 /* Remember the early placement of this block to move it
1497 out of loop no further than the early placement. */
1498 early = get_nodes_Block(n);
1499 /* Assure that our users are all placed, except the Phi-nodes.
1500 --- Each data flow cycle contains at least one Phi-node. We
1501 have to break the `user has to be placed before the
1502 producer' dependence cycle and the Phi-nodes are the
1503 place to do so, because we need to base our placement on the
1504 final region of our users, which is OK with Phi-nodes, as they
1505 are pinned, and they never have to be placed after a
1506 producer of one of their inputs in the same block anyway. */
1507 for (i = 0; i < get_irn_n_outs(n); i++) {
1508 ir_node *succ = get_irn_out(n, i);
1509 if (irn_not_visited(succ) && (intern_get_irn_op(succ) != op_Phi))
1510 place_floats_late(succ, worklist);
1513 /* We have to determine the final block of this node... except for
1515 if ((get_op_pinned(intern_get_irn_op(n)) == floats) &&
1516 (intern_get_irn_op(n) != op_Const) &&
1517 (intern_get_irn_op(n) != op_SymConst)) {
1518 ir_node *dca = NULL; /* deepest common ancestor in the
1519 dominator tree of all nodes'
1520 blocks depending on us; our final
1521 placement has to dominate DCA. */
1522 for (i = 0; i < get_irn_n_outs(n); i++) {
1523 dca = consumer_dom_dca (dca, get_irn_out(n, i), n);
1525 set_nodes_Block(n, dca);
1527 move_out_of_loops (n, early);
1531 mark_irn_visited(n);
1533 /* Add predecessors of all non-floating nodes on list. (Those of floating
1534 nodes are placeded already and therefore are marked.) */
1535 for (i = 0; i < get_irn_n_outs(n); i++) {
1536 if (irn_not_visited(get_irn_out(n, i))) {
1537 pdeq_putr (worklist, get_irn_out(n, i));
1542 static INLINE void place_late(pdeq* worklist) {
1544 inc_irg_visited(current_ir_graph);
1546 /* This fills the worklist initially. */
1547 place_floats_late(get_irg_start_block(current_ir_graph), worklist);
1548 /* And now empty the worklist again... */
1549 while (!pdeq_empty (worklist)) {
1550 ir_node *n = pdeq_getl (worklist);
1551 if (irn_not_visited(n)) place_floats_late(n, worklist);
1555 void place_code(ir_graph *irg) {
1557 ir_graph *rem = current_ir_graph;
1559 current_ir_graph = irg;
1561 if (!(get_opt_optimize() && get_opt_global_cse())) return;
1563 /* Handle graph state */
1564 assert(get_irg_phase_state(irg) != phase_building);
1565 if (get_irg_dom_state(irg) != dom_consistent)
1568 if (get_irg_loopinfo_state(irg) != loopinfo_consistent) {
1569 free_loop_information(irg);
1570 construct_backedges(irg);
1573 /* Place all floating nodes as early as possible. This guarantees
1574 a legal code placement. */
1575 worklist = new_pdeq();
1576 place_early(worklist);
1578 /* place_early invalidates the outs, place_late needs them. */
1580 /* Now move the nodes down in the dominator tree. This reduces the
1581 unnecessary executions of the node. */
1582 place_late(worklist);
1584 set_irg_outs_inconsistent(current_ir_graph);
1585 set_irg_loopinfo_inconsistent(current_ir_graph);
1587 current_ir_graph = rem;
1592 /********************************************************************/
1593 /* Control flow optimization. */
1594 /* Removes Bad control flow predecessors and empty blocks. A block */
1595 /* is empty if it contains only a Jmp node. */
1596 /* Blocks can only be removed if they are not needed for the */
1597 /* semantics of Phi nodes. */
1598 /********************************************************************/
1601 * Removes Tuples from Block control flow predecessors.
1602 * Optimizes blocks with equivalent_node().
1603 * Replaces n by Bad if n is unreachable control flow.
1605 static void merge_blocks(ir_node *n, void *env) {
1607 set_irn_link(n, NULL);
1609 if (intern_get_irn_op(n) == op_Block) {
1611 for (i = 0; i < get_Block_n_cfgpreds(n); i++)
1612 /* GL @@@ : is this possible? if (get_opt_normalize()) -- added, all tests go through.
1613 A different order of optimizations might cause problems. */
1614 if (get_opt_normalize())
1615 set_Block_cfgpred(n, i, skip_Tuple(get_Block_cfgpred(n, i)));
1616 } else if (get_opt_optimize() && (intern_get_irn_mode(n) == mode_X)) {
1617 /* We will soon visit a block. Optimize it before visiting! */
1618 ir_node *b = get_nodes_Block(n);
1619 ir_node *new_node = equivalent_node(b);
1620 while (irn_not_visited(b) && (!is_Bad(new_node)) && (new_node != b)) {
1621 /* We would have to run gigo if new is bad, so we
1622 promote it directly below. */
1623 assert(((b == new_node) ||
1624 get_opt_control_flow_straightening() ||
1625 get_opt_control_flow_weak_simplification()) &&
1626 ("strange flag setting"));
1627 exchange (b, new_node);
1629 new_node = equivalent_node(b);
1631 /* GL @@@ get_opt_normalize hinzugefuegt, 5.5.2003 */
1632 if (is_Bad(new_node) && get_opt_normalize()) exchange(n, new_Bad());
1637 * Collects all Phi nodes in link list of Block.
1638 * Marks all blocks "block_visited" if they contain a node other
1641 static void collect_nodes(ir_node *n, void *env) {
1642 if (is_no_Block(n)) {
1643 ir_node *b = get_nodes_Block(n);
1645 if ((intern_get_irn_op(n) == op_Phi)) {
1646 /* Collect Phi nodes to compact ins along with block's ins. */
1647 set_irn_link(n, get_irn_link(b));
1649 } else if (intern_get_irn_op(n) != op_Jmp) { /* Check for non empty block. */
1650 mark_Block_block_visited(b);
1655 /** Returns true if pred is predecessor of block. */
1656 static int is_pred_of(ir_node *pred, ir_node *b) {
1658 for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
1659 ir_node *b_pred = get_nodes_Block(get_Block_cfgpred(b, i));
1660 if (b_pred == pred) return 1;
1665 static int test_whether_dispensable(ir_node *b, int pos) {
1666 int i, j, n_preds = 1;
1667 int dispensable = 1;
1668 ir_node *cfop = get_Block_cfgpred(b, pos);
1669 ir_node *pred = get_nodes_Block(cfop);
1671 if (get_Block_block_visited(pred) + 1
1672 < get_irg_block_visited(current_ir_graph)) {
1673 if (!get_opt_optimize() || !get_opt_control_flow_strong_simplification()) {
1674 /* Mark block so that is will not be removed. */
1675 set_Block_block_visited(pred, get_irg_block_visited(current_ir_graph)-1);
1678 /* Seems to be empty. */
1679 if (!get_irn_link(b)) {
1680 /* There are no Phi nodes ==> dispensable. */
1681 n_preds = get_Block_n_cfgpreds(pred);
1683 /* b's pred blocks and pred's pred blocks must be pairwise disjunct.
1684 Work preds < pos as if they were already removed. */
1685 for (i = 0; i < pos; i++) {
1686 ir_node *b_pred = get_nodes_Block(get_Block_cfgpred(b, i));
1687 if (get_Block_block_visited(b_pred) + 1
1688 < get_irg_block_visited(current_ir_graph)) {
1689 for (j = 0; j < get_Block_n_cfgpreds(b_pred); j++) {
1690 ir_node *b_pred_pred = get_nodes_Block(get_Block_cfgpred(b_pred, j));
1691 if (is_pred_of(b_pred_pred, pred)) dispensable = 0;
1694 if (is_pred_of(b_pred, pred)) dispensable = 0;
1697 for (i = pos +1; i < get_Block_n_cfgpreds(b); i++) {
1698 ir_node *b_pred = get_nodes_Block(get_Block_cfgpred(b, i));
1699 if (is_pred_of(b_pred, pred)) dispensable = 0;
1702 set_Block_block_visited(pred, get_irg_block_visited(current_ir_graph)-1);
1705 n_preds = get_Block_n_cfgpreds(pred);
1713 static void optimize_blocks(ir_node *b, void *env) {
1714 int i, j, k, max_preds, n_preds;
1715 ir_node *pred, *phi;
1718 /* Count the number of predecessor if this block is merged with pred blocks
1721 for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
1722 max_preds += test_whether_dispensable(b, i);
1724 in = (ir_node **) malloc(max_preds * sizeof(ir_node *));
1727 printf(" working on "); DDMN(b);
1728 for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
1729 pred = get_nodes_Block(get_Block_cfgpred(b, i));
1730 if (is_Bad(get_Block_cfgpred(b, i))) {
1731 printf(" removing Bad %i\n ", i);
1732 } else if (get_Block_block_visited(pred) +1
1733 < get_irg_block_visited(current_ir_graph)) {
1734 printf(" removing pred %i ", i); DDMN(pred);
1735 } else { printf(" Nothing to do for "); DDMN(pred); }
1737 * end Debug output -*/
1739 /*- Fix the Phi nodes -*/
1740 phi = get_irn_link(b);
1742 assert(intern_get_irn_op(phi) == op_Phi);
1743 /* Find the new predecessors for the Phi */
1745 for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
1746 pred = get_nodes_Block(get_Block_cfgpred(b, i));
1747 if (is_Bad(get_Block_cfgpred(b, i))) {
1749 } else if (get_Block_block_visited(pred) +1
1750 < get_irg_block_visited(current_ir_graph)) {
1751 /* It's an empty block and not yet visited. */
1752 ir_node *phi_pred = get_Phi_pred(phi, i);
1753 for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
1754 if (get_nodes_Block(phi_pred) == pred) {
1755 assert(intern_get_irn_op(phi_pred) == op_Phi); /* Block is empty!! */
1756 in[n_preds] = get_Phi_pred(phi_pred, j);
1758 in[n_preds] = phi_pred;
1762 /* The Phi_pred node is replaced now if it is a Phi.
1763 In Schleifen kann offenbar der entfernte Phi Knoten legal verwendet werden.
1764 Daher muss der Phiknoten durch den neuen ersetzt werden.
1765 Weiter muss der alte Phiknoten entfernt werden (durch ersetzen oder
1766 durch einen Bad) damit er aus den keep_alive verschwinden kann.
1767 Man sollte also, falls keine Schleife vorliegt, exchange mit new_Bad
1769 if (get_nodes_Block(phi_pred) == pred) {
1770 /* remove the Phi as it might be kept alive. Further there
1771 might be other users. */
1772 exchange(phi_pred, phi); /* geht, ist aber doch semantisch falsch! Warum?? */
1775 in[n_preds] = get_Phi_pred(phi, i);
1780 set_irn_in(phi, n_preds, in);
1782 phi = get_irn_link(phi);
1786 This happens only if merge between loop backedge and single loop entry. -*/
1787 for (k = 0; k < get_Block_n_cfgpreds(b); k++) {
1788 pred = get_nodes_Block(get_Block_cfgpred(b, k));
1789 if (get_Block_block_visited(pred) +1
1790 < get_irg_block_visited(current_ir_graph)) {
1791 phi = get_irn_link(pred);
1793 if (intern_get_irn_op(phi) == op_Phi) {
1794 set_nodes_Block(phi, b);
1797 for (i = 0; i < k; i++) {
1798 pred = get_nodes_Block(get_Block_cfgpred(b, i));
1799 if (is_Bad(get_Block_cfgpred(b, i))) {
1801 } else if (get_Block_block_visited(pred) +1
1802 < get_irg_block_visited(current_ir_graph)) {
1803 /* It's an empty block and not yet visited. */
1804 for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
1805 /* @@@ Hier brauche ich Schleifeninformation!!! Kontrollflusskante
1806 muss Rueckwaertskante sein! (An allen vier in[n_preds] = phi
1807 Anweisungen.) Trotzdem tuts bisher!! */
1816 for (i = 0; i < get_Phi_n_preds(phi); i++) {
1817 in[n_preds] = get_Phi_pred(phi, i);
1820 for (i = k+1; i < get_Block_n_cfgpreds(b); i++) {
1821 pred = get_nodes_Block(get_Block_cfgpred(b, i));
1822 if (is_Bad(get_Block_cfgpred(b, i))) {
1824 } else if (get_Block_block_visited(pred) +1
1825 < get_irg_block_visited(current_ir_graph)) {
1826 /* It's an empty block and not yet visited. */
1827 for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
1836 set_irn_in(phi, n_preds, in);
1838 phi = get_irn_link(phi);
1843 /*- Fix the block -*/
1845 for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
1846 pred = get_nodes_Block(get_Block_cfgpred(b, i));
1847 if (is_Bad(get_Block_cfgpred(b, i))) {
1849 } else if (get_Block_block_visited(pred) +1
1850 < get_irg_block_visited(current_ir_graph)) {
1851 /* It's an empty block and not yet visited. */
1852 assert(get_Block_n_cfgpreds(b) > 1);
1853 /* Else it should be optimized by equivalent_node. */
1854 for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
1855 in[n_preds] = get_Block_cfgpred(pred, j);
1858 /* Remove block as it might be kept alive. */
1859 exchange(pred, b/*new_Bad()*/);
1861 in[n_preds] = get_Block_cfgpred(b, i);
1865 set_irn_in(b, n_preds, in);
1869 void optimize_cf(ir_graph *irg) {
1872 ir_node *end = get_irg_end(irg);
1873 ir_graph *rem = current_ir_graph;
1874 current_ir_graph = irg;
1876 /* Handle graph state */
1877 assert(get_irg_phase_state(irg) != phase_building);
1878 if (get_irg_outs_state(current_ir_graph) == outs_consistent)
1879 set_irg_outs_inconsistent(current_ir_graph);
1880 if (get_irg_dom_state(current_ir_graph) == dom_consistent)
1881 set_irg_dom_inconsistent(current_ir_graph);
1883 /* Use block visited flag to mark non-empty blocks. */
1884 inc_irg_block_visited(irg);
1885 irg_walk(end, merge_blocks, collect_nodes, NULL);
1887 /* Optimize the standard code. */
1888 irg_block_walk(get_irg_end_block(irg), optimize_blocks, NULL, NULL);
1890 /* Walk all keep alives, optimize them if block, add to new in-array
1891 for end if useful. */
1892 in = NEW_ARR_F (ir_node *, 1);
1893 in[0] = get_nodes_Block(end);
1894 inc_irg_visited(current_ir_graph);
1895 for(i = 0; i < get_End_n_keepalives(end); i++) {
1896 ir_node *ka = get_End_keepalive(end, i);
1897 if (irn_not_visited(ka)) {
1898 if ((intern_get_irn_op(ka) == op_Block) && Block_not_block_visited(ka)) {
1899 set_irg_block_visited(current_ir_graph, /* Don't walk all the way to Start. */
1900 get_irg_block_visited(current_ir_graph)-1);
1901 irg_block_walk(ka, optimize_blocks, NULL, NULL);
1902 mark_irn_visited(ka);
1903 ARR_APP1 (ir_node *, in, ka);
1904 } else if (intern_get_irn_op(ka) == op_Phi) {
1905 mark_irn_visited(ka);
1906 ARR_APP1 (ir_node *, in, ka);
1910 /* DEL_ARR_F(end->in); GL @@@ tut nicht ! */
1913 current_ir_graph = rem;
1918 * Called by walker of remove_critical_cf_edges.
1920 * Place an empty block to an edge between a blocks of multiple
1921 * predecessors and a block of multiple successors.
1924 * @param env Environment of walker. This field is unused and has
1927 static void walk_critical_cf_edges(ir_node *n, void *env) {
1929 ir_node *pre, *block, **in, *jmp;
1931 /* Block has multiple predecessors */
1932 if ((op_Block == intern_get_irn_op(n)) &&
1933 (intern_get_irn_arity(n) > 1)) {
1934 arity = intern_get_irn_arity(n);
1936 if (n == get_irg_end_block(current_ir_graph))
1937 return; /* No use to add a block here. */
1939 for (i=0; i<arity; i++) {
1940 pre = intern_get_irn_n(n, i);
1941 /* Predecessor has multiple successors. Insert new flow edge */
1942 if ((NULL != pre) &&
1943 (op_Proj == intern_get_irn_op(pre)) &&
1944 op_Raise != intern_get_irn_op(skip_Proj(pre))) {
1946 /* set predecessor array for new block */
1947 in = NEW_ARR_D (ir_node *, current_ir_graph->obst, 1);
1948 /* set predecessor of new block */
1950 block = new_Block(1, in);
1951 /* insert new jmp node to new block */
1952 switch_block(block);
1955 /* set successor of new block */
1956 set_irn_n(n, i, jmp);
1958 } /* predecessor has multiple successors */
1959 } /* for all predecessors */
1960 } /* n is a block */
1963 void remove_critical_cf_edges(ir_graph *irg) {
1964 if (get_opt_critical_edges())
1965 irg_walk_graph(irg, NULL, walk_critical_cf_edges, NULL);