Mercurial > hg > truffle
annotate src/share/vm/opto/lcm.cpp @ 497:7aadaf46ecd7
Merge
author | jmasa |
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date | Fri, 19 Dec 2008 12:15:34 -0800 |
parents | 5f44674206d3 |
children | 3b5ac9e7e6ea |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1998-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Optimization - Graph Style | |
26 | |
27 #include "incls/_precompiled.incl" | |
28 #include "incls/_lcm.cpp.incl" | |
29 | |
30 //------------------------------implicit_null_check---------------------------- | |
31 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
32 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
33 // I can generate a memory op if there is not one nearby. | |
34 // The proj is the control projection for the not-null case. | |
35 // The val is the pointer being checked for nullness. | |
36 void Block::implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons) { | |
37 // Assume if null check need for 0 offset then always needed | |
38 // Intel solaris doesn't support any null checks yet and no | |
39 // mechanism exists (yet) to set the switches at an os_cpu level | |
40 if( !ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(0)) return; | |
41 | |
42 // Make sure the ptr-is-null path appears to be uncommon! | |
43 float f = end()->as_MachIf()->_prob; | |
44 if( proj->Opcode() == Op_IfTrue ) f = 1.0f - f; | |
45 if( f > PROB_UNLIKELY_MAG(4) ) return; | |
46 | |
47 uint bidx = 0; // Capture index of value into memop | |
48 bool was_store; // Memory op is a store op | |
49 | |
50 // Get the successor block for if the test ptr is non-null | |
51 Block* not_null_block; // this one goes with the proj | |
52 Block* null_block; | |
53 if (_nodes[_nodes.size()-1] == proj) { | |
54 null_block = _succs[0]; | |
55 not_null_block = _succs[1]; | |
56 } else { | |
57 assert(_nodes[_nodes.size()-2] == proj, "proj is one or the other"); | |
58 not_null_block = _succs[0]; | |
59 null_block = _succs[1]; | |
60 } | |
332 | 61 while (null_block->is_Empty() == Block::empty_with_goto) { |
62 null_block = null_block->_succs[0]; | |
63 } | |
0 | 64 |
65 // Search the exception block for an uncommon trap. | |
66 // (See Parse::do_if and Parse::do_ifnull for the reason | |
67 // we need an uncommon trap. Briefly, we need a way to | |
68 // detect failure of this optimization, as in 6366351.) | |
69 { | |
70 bool found_trap = false; | |
71 for (uint i1 = 0; i1 < null_block->_nodes.size(); i1++) { | |
72 Node* nn = null_block->_nodes[i1]; | |
73 if (nn->is_MachCall() && | |
74 nn->as_MachCall()->entry_point() == | |
75 SharedRuntime::uncommon_trap_blob()->instructions_begin()) { | |
76 const Type* trtype = nn->in(TypeFunc::Parms)->bottom_type(); | |
77 if (trtype->isa_int() && trtype->is_int()->is_con()) { | |
78 jint tr_con = trtype->is_int()->get_con(); | |
79 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con); | |
80 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con); | |
81 assert((int)reason < (int)BitsPerInt, "recode bit map"); | |
82 if (is_set_nth_bit(allowed_reasons, (int) reason) | |
83 && action != Deoptimization::Action_none) { | |
84 // This uncommon trap is sure to recompile, eventually. | |
85 // When that happens, C->too_many_traps will prevent | |
86 // this transformation from happening again. | |
87 found_trap = true; | |
88 } | |
89 } | |
90 break; | |
91 } | |
92 } | |
93 if (!found_trap) { | |
94 // We did not find an uncommon trap. | |
95 return; | |
96 } | |
97 } | |
98 | |
99 // Search the successor block for a load or store who's base value is also | |
100 // the tested value. There may be several. | |
101 Node_List *out = new Node_List(Thread::current()->resource_area()); | |
102 MachNode *best = NULL; // Best found so far | |
103 for (DUIterator i = val->outs(); val->has_out(i); i++) { | |
104 Node *m = val->out(i); | |
105 if( !m->is_Mach() ) continue; | |
106 MachNode *mach = m->as_Mach(); | |
107 was_store = false; | |
108 switch( mach->ideal_Opcode() ) { | |
109 case Op_LoadB: | |
110 case Op_LoadC: | |
111 case Op_LoadD: | |
112 case Op_LoadF: | |
113 case Op_LoadI: | |
114 case Op_LoadL: | |
115 case Op_LoadP: | |
113
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116 case Op_LoadN: |
0 | 117 case Op_LoadS: |
118 case Op_LoadKlass: | |
164
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119 case Op_LoadNKlass: |
0 | 120 case Op_LoadRange: |
121 case Op_LoadD_unaligned: | |
122 case Op_LoadL_unaligned: | |
123 break; | |
124 case Op_StoreB: | |
125 case Op_StoreC: | |
126 case Op_StoreCM: | |
127 case Op_StoreD: | |
128 case Op_StoreF: | |
129 case Op_StoreI: | |
130 case Op_StoreL: | |
131 case Op_StoreP: | |
113
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132 case Op_StoreN: |
0 | 133 was_store = true; // Memory op is a store op |
134 // Stores will have their address in slot 2 (memory in slot 1). | |
135 // If the value being nul-checked is in another slot, it means we | |
136 // are storing the checked value, which does NOT check the value! | |
137 if( mach->in(2) != val ) continue; | |
138 break; // Found a memory op? | |
139 case Op_StrComp: | |
169
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140 case Op_AryEq: |
0 | 141 // Not a legit memory op for implicit null check regardless of |
142 // embedded loads | |
143 continue; | |
144 default: // Also check for embedded loads | |
145 if( !mach->needs_anti_dependence_check() ) | |
146 continue; // Not an memory op; skip it | |
147 break; | |
148 } | |
149 // check if the offset is not too high for implicit exception | |
150 { | |
151 intptr_t offset = 0; | |
152 const TypePtr *adr_type = NULL; // Do not need this return value here | |
153 const Node* base = mach->get_base_and_disp(offset, adr_type); | |
154 if (base == NULL || base == NodeSentinel) { | |
332 | 155 // Narrow oop address doesn't have base, only index |
156 if( val->bottom_type()->isa_narrowoop() && | |
157 MacroAssembler::needs_explicit_null_check(offset) ) | |
158 continue; // Give up if offset is beyond page size | |
0 | 159 // cannot reason about it; is probably not implicit null exception |
160 } else { | |
161 const TypePtr* tptr = base->bottom_type()->is_ptr(); | |
162 // Give up if offset is not a compile-time constant | |
163 if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot ) | |
164 continue; | |
165 offset += tptr->_offset; // correct if base is offseted | |
166 if( MacroAssembler::needs_explicit_null_check(offset) ) | |
167 continue; // Give up is reference is beyond 4K page size | |
168 } | |
169 } | |
170 | |
171 // Check ctrl input to see if the null-check dominates the memory op | |
172 Block *cb = cfg->_bbs[mach->_idx]; | |
173 cb = cb->_idom; // Always hoist at least 1 block | |
174 if( !was_store ) { // Stores can be hoisted only one block | |
175 while( cb->_dom_depth > (_dom_depth + 1)) | |
176 cb = cb->_idom; // Hoist loads as far as we want | |
177 // The non-null-block should dominate the memory op, too. Live | |
178 // range spilling will insert a spill in the non-null-block if it is | |
179 // needs to spill the memory op for an implicit null check. | |
180 if (cb->_dom_depth == (_dom_depth + 1)) { | |
181 if (cb != not_null_block) continue; | |
182 cb = cb->_idom; | |
183 } | |
184 } | |
185 if( cb != this ) continue; | |
186 | |
187 // Found a memory user; see if it can be hoisted to check-block | |
188 uint vidx = 0; // Capture index of value into memop | |
189 uint j; | |
190 for( j = mach->req()-1; j > 0; j-- ) { | |
191 if( mach->in(j) == val ) vidx = j; | |
192 // Block of memory-op input | |
193 Block *inb = cfg->_bbs[mach->in(j)->_idx]; | |
194 Block *b = this; // Start from nul check | |
195 while( b != inb && b->_dom_depth > inb->_dom_depth ) | |
196 b = b->_idom; // search upwards for input | |
197 // See if input dominates null check | |
198 if( b != inb ) | |
199 break; | |
200 } | |
201 if( j > 0 ) | |
202 continue; | |
203 Block *mb = cfg->_bbs[mach->_idx]; | |
204 // Hoisting stores requires more checks for the anti-dependence case. | |
205 // Give up hoisting if we have to move the store past any load. | |
206 if( was_store ) { | |
207 Block *b = mb; // Start searching here for a local load | |
208 // mach use (faulting) trying to hoist | |
209 // n might be blocker to hoisting | |
210 while( b != this ) { | |
211 uint k; | |
212 for( k = 1; k < b->_nodes.size(); k++ ) { | |
213 Node *n = b->_nodes[k]; | |
214 if( n->needs_anti_dependence_check() && | |
215 n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) ) | |
216 break; // Found anti-dependent load | |
217 } | |
218 if( k < b->_nodes.size() ) | |
219 break; // Found anti-dependent load | |
220 // Make sure control does not do a merge (would have to check allpaths) | |
221 if( b->num_preds() != 2 ) break; | |
222 b = cfg->_bbs[b->pred(1)->_idx]; // Move up to predecessor block | |
223 } | |
224 if( b != this ) continue; | |
225 } | |
226 | |
227 // Make sure this memory op is not already being used for a NullCheck | |
228 Node *e = mb->end(); | |
229 if( e->is_MachNullCheck() && e->in(1) == mach ) | |
230 continue; // Already being used as a NULL check | |
231 | |
232 // Found a candidate! Pick one with least dom depth - the highest | |
233 // in the dom tree should be closest to the null check. | |
234 if( !best || | |
235 cfg->_bbs[mach->_idx]->_dom_depth < cfg->_bbs[best->_idx]->_dom_depth ) { | |
236 best = mach; | |
237 bidx = vidx; | |
238 | |
239 } | |
240 } | |
241 // No candidate! | |
242 if( !best ) return; | |
243 | |
244 // ---- Found an implicit null check | |
245 extern int implicit_null_checks; | |
246 implicit_null_checks++; | |
247 | |
248 // Hoist the memory candidate up to the end of the test block. | |
249 Block *old_block = cfg->_bbs[best->_idx]; | |
250 old_block->find_remove(best); | |
251 add_inst(best); | |
252 cfg->_bbs.map(best->_idx,this); | |
253 | |
254 // Move the control dependence | |
255 if (best->in(0) && best->in(0) == old_block->_nodes[0]) | |
256 best->set_req(0, _nodes[0]); | |
257 | |
258 // Check for flag-killing projections that also need to be hoisted | |
259 // Should be DU safe because no edge updates. | |
260 for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) { | |
261 Node* n = best->fast_out(j); | |
262 if( n->Opcode() == Op_MachProj ) { | |
263 cfg->_bbs[n->_idx]->find_remove(n); | |
264 add_inst(n); | |
265 cfg->_bbs.map(n->_idx,this); | |
266 } | |
267 } | |
268 | |
269 Compile *C = cfg->C; | |
270 // proj==Op_True --> ne test; proj==Op_False --> eq test. | |
271 // One of two graph shapes got matched: | |
272 // (IfTrue (If (Bool NE (CmpP ptr NULL)))) | |
273 // (IfFalse (If (Bool EQ (CmpP ptr NULL)))) | |
274 // NULL checks are always branch-if-eq. If we see a IfTrue projection | |
275 // then we are replacing a 'ne' test with a 'eq' NULL check test. | |
276 // We need to flip the projections to keep the same semantics. | |
277 if( proj->Opcode() == Op_IfTrue ) { | |
278 // Swap order of projections in basic block to swap branch targets | |
279 Node *tmp1 = _nodes[end_idx()+1]; | |
280 Node *tmp2 = _nodes[end_idx()+2]; | |
281 _nodes.map(end_idx()+1, tmp2); | |
282 _nodes.map(end_idx()+2, tmp1); | |
283 Node *tmp = new (C, 1) Node(C->top()); // Use not NULL input | |
284 tmp1->replace_by(tmp); | |
285 tmp2->replace_by(tmp1); | |
286 tmp->replace_by(tmp2); | |
287 tmp->destruct(); | |
288 } | |
289 | |
290 // Remove the existing null check; use a new implicit null check instead. | |
291 // Since schedule-local needs precise def-use info, we need to correct | |
292 // it as well. | |
293 Node *old_tst = proj->in(0); | |
294 MachNode *nul_chk = new (C) MachNullCheckNode(old_tst->in(0),best,bidx); | |
295 _nodes.map(end_idx(),nul_chk); | |
296 cfg->_bbs.map(nul_chk->_idx,this); | |
297 // Redirect users of old_test to nul_chk | |
298 for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2) | |
299 old_tst->last_out(i2)->set_req(0, nul_chk); | |
300 // Clean-up any dead code | |
301 for (uint i3 = 0; i3 < old_tst->req(); i3++) | |
302 old_tst->set_req(i3, NULL); | |
303 | |
304 cfg->latency_from_uses(nul_chk); | |
305 cfg->latency_from_uses(best); | |
306 } | |
307 | |
308 | |
309 //------------------------------select----------------------------------------- | |
310 // Select a nice fellow from the worklist to schedule next. If there is only | |
311 // one choice, then use it. Projections take top priority for correctness | |
312 // reasons - if I see a projection, then it is next. There are a number of | |
313 // other special cases, for instructions that consume condition codes, et al. | |
314 // These are chosen immediately. Some instructions are required to immediately | |
315 // precede the last instruction in the block, and these are taken last. Of the | |
316 // remaining cases (most), choose the instruction with the greatest latency | |
317 // (that is, the most number of pseudo-cycles required to the end of the | |
318 // routine). If there is a tie, choose the instruction with the most inputs. | |
319 Node *Block::select(PhaseCFG *cfg, Node_List &worklist, int *ready_cnt, VectorSet &next_call, uint sched_slot) { | |
320 | |
321 // If only a single entry on the stack, use it | |
322 uint cnt = worklist.size(); | |
323 if (cnt == 1) { | |
324 Node *n = worklist[0]; | |
325 worklist.map(0,worklist.pop()); | |
326 return n; | |
327 } | |
328 | |
329 uint choice = 0; // Bigger is most important | |
330 uint latency = 0; // Bigger is scheduled first | |
331 uint score = 0; // Bigger is better | |
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332 int idx = -1; // Index in worklist |
0 | 333 |
334 for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist | |
335 // Order in worklist is used to break ties. | |
336 // See caller for how this is used to delay scheduling | |
337 // of induction variable increments to after the other | |
338 // uses of the phi are scheduled. | |
339 Node *n = worklist[i]; // Get Node on worklist | |
340 | |
341 int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0; | |
342 if( n->is_Proj() || // Projections always win | |
343 n->Opcode()== Op_Con || // So does constant 'Top' | |
344 iop == Op_CreateEx || // Create-exception must start block | |
345 iop == Op_CheckCastPP | |
346 ) { | |
347 worklist.map(i,worklist.pop()); | |
348 return n; | |
349 } | |
350 | |
351 // Final call in a block must be adjacent to 'catch' | |
352 Node *e = end(); | |
353 if( e->is_Catch() && e->in(0)->in(0) == n ) | |
354 continue; | |
355 | |
356 // Memory op for an implicit null check has to be at the end of the block | |
357 if( e->is_MachNullCheck() && e->in(1) == n ) | |
358 continue; | |
359 | |
360 uint n_choice = 2; | |
361 | |
362 // See if this instruction is consumed by a branch. If so, then (as the | |
363 // branch is the last instruction in the basic block) force it to the | |
364 // end of the basic block | |
365 if ( must_clone[iop] ) { | |
366 // See if any use is a branch | |
367 bool found_machif = false; | |
368 | |
369 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
370 Node* use = n->fast_out(j); | |
371 | |
372 // The use is a conditional branch, make them adjacent | |
373 if (use->is_MachIf() && cfg->_bbs[use->_idx]==this ) { | |
374 found_machif = true; | |
375 break; | |
376 } | |
377 | |
378 // More than this instruction pending for successor to be ready, | |
379 // don't choose this if other opportunities are ready | |
380 if (ready_cnt[use->_idx] > 1) | |
381 n_choice = 1; | |
382 } | |
383 | |
384 // loop terminated, prefer not to use this instruction | |
385 if (found_machif) | |
386 continue; | |
387 } | |
388 | |
389 // See if this has a predecessor that is "must_clone", i.e. sets the | |
390 // condition code. If so, choose this first | |
391 for (uint j = 0; j < n->req() ; j++) { | |
392 Node *inn = n->in(j); | |
393 if (inn) { | |
394 if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) { | |
395 n_choice = 3; | |
396 break; | |
397 } | |
398 } | |
399 } | |
400 | |
401 // MachTemps should be scheduled last so they are near their uses | |
402 if (n->is_MachTemp()) { | |
403 n_choice = 1; | |
404 } | |
405 | |
406 uint n_latency = cfg->_node_latency.at_grow(n->_idx); | |
407 uint n_score = n->req(); // Many inputs get high score to break ties | |
408 | |
409 // Keep best latency found | |
410 if( choice < n_choice || | |
411 ( choice == n_choice && | |
412 ( latency < n_latency || | |
413 ( latency == n_latency && | |
414 ( score < n_score ))))) { | |
415 choice = n_choice; | |
416 latency = n_latency; | |
417 score = n_score; | |
418 idx = i; // Also keep index in worklist | |
419 } | |
420 } // End of for all ready nodes in worklist | |
421 | |
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422 assert(idx >= 0, "index should be set"); |
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423 Node *n = worklist[(uint)idx]; // Get the winner |
0 | 424 |
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425 worklist.map((uint)idx, worklist.pop()); // Compress worklist |
0 | 426 return n; |
427 } | |
428 | |
429 | |
430 //------------------------------set_next_call---------------------------------- | |
431 void Block::set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ) { | |
432 if( next_call.test_set(n->_idx) ) return; | |
433 for( uint i=0; i<n->len(); i++ ) { | |
434 Node *m = n->in(i); | |
435 if( !m ) continue; // must see all nodes in block that precede call | |
436 if( bbs[m->_idx] == this ) | |
437 set_next_call( m, next_call, bbs ); | |
438 } | |
439 } | |
440 | |
441 //------------------------------needed_for_next_call--------------------------- | |
442 // Set the flag 'next_call' for each Node that is needed for the next call to | |
443 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
444 // next subroutine call get priority - basically it moves things NOT needed | |
445 // for the next call till after the call. This prevents me from trying to | |
446 // carry lots of stuff live across a call. | |
447 void Block::needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs) { | |
448 // Find the next control-defining Node in this block | |
449 Node* call = NULL; | |
450 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
451 Node* m = this_call->fast_out(i); | |
452 if( bbs[m->_idx] == this && // Local-block user | |
453 m != this_call && // Not self-start node | |
454 m->is_Call() ) | |
455 call = m; | |
456 break; | |
457 } | |
458 if (call == NULL) return; // No next call (e.g., block end is near) | |
459 // Set next-call for all inputs to this call | |
460 set_next_call(call, next_call, bbs); | |
461 } | |
462 | |
463 //------------------------------sched_call------------------------------------- | |
464 uint Block::sched_call( Matcher &matcher, Block_Array &bbs, uint node_cnt, Node_List &worklist, int *ready_cnt, MachCallNode *mcall, VectorSet &next_call ) { | |
465 RegMask regs; | |
466 | |
467 // Schedule all the users of the call right now. All the users are | |
468 // projection Nodes, so they must be scheduled next to the call. | |
469 // Collect all the defined registers. | |
470 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
471 Node* n = mcall->fast_out(i); | |
472 assert( n->Opcode()==Op_MachProj, "" ); | |
473 --ready_cnt[n->_idx]; | |
474 assert( !ready_cnt[n->_idx], "" ); | |
475 // Schedule next to call | |
476 _nodes.map(node_cnt++, n); | |
477 // Collect defined registers | |
478 regs.OR(n->out_RegMask()); | |
479 // Check for scheduling the next control-definer | |
480 if( n->bottom_type() == Type::CONTROL ) | |
481 // Warm up next pile of heuristic bits | |
482 needed_for_next_call(n, next_call, bbs); | |
483 | |
484 // Children of projections are now all ready | |
485 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
486 Node* m = n->fast_out(j); // Get user | |
487 if( bbs[m->_idx] != this ) continue; | |
488 if( m->is_Phi() ) continue; | |
489 if( !--ready_cnt[m->_idx] ) | |
490 worklist.push(m); | |
491 } | |
492 | |
493 } | |
494 | |
495 // Act as if the call defines the Frame Pointer. | |
496 // Certainly the FP is alive and well after the call. | |
497 regs.Insert(matcher.c_frame_pointer()); | |
498 | |
499 // Set all registers killed and not already defined by the call. | |
500 uint r_cnt = mcall->tf()->range()->cnt(); | |
501 int op = mcall->ideal_Opcode(); | |
502 MachProjNode *proj = new (matcher.C, 1) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); | |
503 bbs.map(proj->_idx,this); | |
504 _nodes.insert(node_cnt++, proj); | |
505 | |
506 // Select the right register save policy. | |
507 const char * save_policy; | |
508 switch (op) { | |
509 case Op_CallRuntime: | |
510 case Op_CallLeaf: | |
511 case Op_CallLeafNoFP: | |
512 // Calling C code so use C calling convention | |
513 save_policy = matcher._c_reg_save_policy; | |
514 break; | |
515 | |
516 case Op_CallStaticJava: | |
517 case Op_CallDynamicJava: | |
518 // Calling Java code so use Java calling convention | |
519 save_policy = matcher._register_save_policy; | |
520 break; | |
521 | |
522 default: | |
523 ShouldNotReachHere(); | |
524 } | |
525 | |
526 // When using CallRuntime mark SOE registers as killed by the call | |
527 // so values that could show up in the RegisterMap aren't live in a | |
528 // callee saved register since the register wouldn't know where to | |
529 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
530 // have debug info on them. Strictly speaking this only needs to be | |
531 // done for oops since idealreg2debugmask takes care of debug info | |
532 // references but there no way to handle oops differently than other | |
533 // pointers as far as the kill mask goes. | |
534 bool exclude_soe = op == Op_CallRuntime; | |
535 | |
536 // Fill in the kill mask for the call | |
537 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { | |
538 if( !regs.Member(r) ) { // Not already defined by the call | |
539 // Save-on-call register? | |
540 if ((save_policy[r] == 'C') || | |
541 (save_policy[r] == 'A') || | |
542 ((save_policy[r] == 'E') && exclude_soe)) { | |
543 proj->_rout.Insert(r); | |
544 } | |
545 } | |
546 } | |
547 | |
548 return node_cnt; | |
549 } | |
550 | |
551 | |
552 //------------------------------schedule_local--------------------------------- | |
553 // Topological sort within a block. Someday become a real scheduler. | |
554 bool Block::schedule_local(PhaseCFG *cfg, Matcher &matcher, int *ready_cnt, VectorSet &next_call) { | |
555 // Already "sorted" are the block start Node (as the first entry), and | |
556 // the block-ending Node and any trailing control projections. We leave | |
557 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
558 // Node. Everything else gets topo-sorted. | |
559 | |
560 #ifndef PRODUCT | |
561 if (cfg->trace_opto_pipelining()) { | |
562 tty->print_cr("# --- schedule_local B%d, before: ---", _pre_order); | |
563 for (uint i = 0;i < _nodes.size();i++) { | |
564 tty->print("# "); | |
565 _nodes[i]->fast_dump(); | |
566 } | |
567 tty->print_cr("#"); | |
568 } | |
569 #endif | |
570 | |
571 // RootNode is already sorted | |
572 if( _nodes.size() == 1 ) return true; | |
573 | |
574 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
575 uint node_cnt = end_idx(); | |
576 uint phi_cnt = 1; | |
577 uint i; | |
578 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
579 Node *n = _nodes[i]; | |
580 if( n->is_Phi() || // Found a PhiNode or ParmNode | |
581 (n->is_Proj() && n->in(0) == head()) ) { | |
582 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt | |
583 _nodes.map(i,_nodes[phi_cnt]); | |
584 _nodes.map(phi_cnt++,n); // swap Phi/Parm up front | |
585 } else { // All others | |
586 // Count block-local inputs to 'n' | |
587 uint cnt = n->len(); // Input count | |
588 uint local = 0; | |
589 for( uint j=0; j<cnt; j++ ) { | |
590 Node *m = n->in(j); | |
591 if( m && cfg->_bbs[m->_idx] == this && !m->is_top() ) | |
592 local++; // One more block-local input | |
593 } | |
594 ready_cnt[n->_idx] = local; // Count em up | |
595 | |
596 // A few node types require changing a required edge to a precedence edge | |
597 // before allocation. | |
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598 if( UseConcMarkSweepGC || UseG1GC ) { |
0 | 599 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) { |
600 // Note: Required edges with an index greater than oper_input_base | |
601 // are not supported by the allocator. | |
602 // Note2: Can only depend on unmatched edge being last, | |
603 // can not depend on its absolute position. | |
604 Node *oop_store = n->in(n->req() - 1); | |
605 n->del_req(n->req() - 1); | |
606 n->add_prec(oop_store); | |
607 assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark"); | |
608 } | |
609 } | |
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610 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire && |
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611 n->req() > TypeFunc::Parms ) { |
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612 // MemBarAcquire could be created without Precedent edge. |
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613 // del_req() replaces the specified edge with the last input edge |
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614 // and then removes the last edge. If the specified edge > number of |
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615 // edges the last edge will be moved outside of the input edges array |
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616 // and the edge will be lost. This is why this code should be |
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617 // executed only when Precedent (== TypeFunc::Parms) edge is present. |
0 | 618 Node *x = n->in(TypeFunc::Parms); |
619 n->del_req(TypeFunc::Parms); | |
620 n->add_prec(x); | |
621 } | |
622 } | |
623 } | |
624 for(uint i2=i; i2<_nodes.size(); i2++ ) // Trailing guys get zapped count | |
625 ready_cnt[_nodes[i2]->_idx] = 0; | |
626 | |
627 // All the prescheduled guys do not hold back internal nodes | |
628 uint i3; | |
629 for(i3 = 0; i3<phi_cnt; i3++ ) { // For all pre-scheduled | |
630 Node *n = _nodes[i3]; // Get pre-scheduled | |
631 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
632 Node* m = n->fast_out(j); | |
633 if( cfg->_bbs[m->_idx] ==this ) // Local-block user | |
634 ready_cnt[m->_idx]--; // Fix ready count | |
635 } | |
636 } | |
637 | |
638 Node_List delay; | |
639 // Make a worklist | |
640 Node_List worklist; | |
641 for(uint i4=i3; i4<node_cnt; i4++ ) { // Put ready guys on worklist | |
642 Node *m = _nodes[i4]; | |
643 if( !ready_cnt[m->_idx] ) { // Zero ready count? | |
644 if (m->is_iteratively_computed()) { | |
645 // Push induction variable increments last to allow other uses | |
646 // of the phi to be scheduled first. The select() method breaks | |
647 // ties in scheduling by worklist order. | |
648 delay.push(m); | |
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649 } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) { |
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650 // Force the CreateEx to the top of the list so it's processed |
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651 // first and ends up at the start of the block. |
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652 worklist.insert(0, m); |
0 | 653 } else { |
654 worklist.push(m); // Then on to worklist! | |
655 } | |
656 } | |
657 } | |
658 while (delay.size()) { | |
659 Node* d = delay.pop(); | |
660 worklist.push(d); | |
661 } | |
662 | |
663 // Warm up the 'next_call' heuristic bits | |
664 needed_for_next_call(_nodes[0], next_call, cfg->_bbs); | |
665 | |
666 #ifndef PRODUCT | |
667 if (cfg->trace_opto_pipelining()) { | |
668 for (uint j=0; j<_nodes.size(); j++) { | |
669 Node *n = _nodes[j]; | |
670 int idx = n->_idx; | |
671 tty->print("# ready cnt:%3d ", ready_cnt[idx]); | |
672 tty->print("latency:%3d ", cfg->_node_latency.at_grow(idx)); | |
673 tty->print("%4d: %s\n", idx, n->Name()); | |
674 } | |
675 } | |
676 #endif | |
677 | |
678 // Pull from worklist and schedule | |
679 while( worklist.size() ) { // Worklist is not ready | |
680 | |
681 #ifndef PRODUCT | |
682 if (cfg->trace_opto_pipelining()) { | |
683 tty->print("# ready list:"); | |
684 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
685 Node *n = worklist[i]; // Get Node on worklist | |
686 tty->print(" %d", n->_idx); | |
687 } | |
688 tty->cr(); | |
689 } | |
690 #endif | |
691 | |
692 // Select and pop a ready guy from worklist | |
693 Node* n = select(cfg, worklist, ready_cnt, next_call, phi_cnt); | |
694 _nodes.map(phi_cnt++,n); // Schedule him next | |
695 | |
696 #ifndef PRODUCT | |
697 if (cfg->trace_opto_pipelining()) { | |
698 tty->print("# select %d: %s", n->_idx, n->Name()); | |
699 tty->print(", latency:%d", cfg->_node_latency.at_grow(n->_idx)); | |
700 n->dump(); | |
701 if (Verbose) { | |
702 tty->print("# ready list:"); | |
703 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
704 Node *n = worklist[i]; // Get Node on worklist | |
705 tty->print(" %d", n->_idx); | |
706 } | |
707 tty->cr(); | |
708 } | |
709 } | |
710 | |
711 #endif | |
712 if( n->is_MachCall() ) { | |
713 MachCallNode *mcall = n->as_MachCall(); | |
714 phi_cnt = sched_call(matcher, cfg->_bbs, phi_cnt, worklist, ready_cnt, mcall, next_call); | |
715 continue; | |
716 } | |
717 // Children are now all ready | |
718 for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) { | |
719 Node* m = n->fast_out(i5); // Get user | |
720 if( cfg->_bbs[m->_idx] != this ) continue; | |
721 if( m->is_Phi() ) continue; | |
722 if( !--ready_cnt[m->_idx] ) | |
723 worklist.push(m); | |
724 } | |
725 } | |
726 | |
727 if( phi_cnt != end_idx() ) { | |
728 // did not schedule all. Retry, Bailout, or Die | |
729 Compile* C = matcher.C; | |
730 if (C->subsume_loads() == true && !C->failing()) { | |
731 // Retry with subsume_loads == false | |
732 // If this is the first failure, the sentinel string will "stick" | |
733 // to the Compile object, and the C2Compiler will see it and retry. | |
734 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
735 } | |
736 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
737 return false; | |
738 } | |
739 | |
740 #ifndef PRODUCT | |
741 if (cfg->trace_opto_pipelining()) { | |
742 tty->print_cr("#"); | |
743 tty->print_cr("# after schedule_local"); | |
744 for (uint i = 0;i < _nodes.size();i++) { | |
745 tty->print("# "); | |
746 _nodes[i]->fast_dump(); | |
747 } | |
748 tty->cr(); | |
749 } | |
750 #endif | |
751 | |
752 | |
753 return true; | |
754 } | |
755 | |
756 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
757 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
758 for (uint l = 0; l < use->len(); l++) { | |
759 if (use->in(l) == old_def) { | |
760 if (l < use->req()) { | |
761 use->set_req(l, new_def); | |
762 } else { | |
763 use->rm_prec(l); | |
764 use->add_prec(new_def); | |
765 l--; | |
766 } | |
767 } | |
768 } | |
769 } | |
770 | |
771 //------------------------------catch_cleanup_find_cloned_def------------------ | |
772 static Node *catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
773 assert( use_blk != def_blk, "Inter-block cleanup only"); | |
774 | |
775 // The use is some block below the Catch. Find and return the clone of the def | |
776 // that dominates the use. If there is no clone in a dominating block, then | |
777 // create a phi for the def in a dominating block. | |
778 | |
779 // Find which successor block dominates this use. The successor | |
780 // blocks must all be single-entry (from the Catch only; I will have | |
781 // split blocks to make this so), hence they all dominate. | |
782 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
783 use_blk = use_blk->_idom; | |
784 | |
785 // Find the successor | |
786 Node *fixup = NULL; | |
787 | |
788 uint j; | |
789 for( j = 0; j < def_blk->_num_succs; j++ ) | |
790 if( use_blk == def_blk->_succs[j] ) | |
791 break; | |
792 | |
793 if( j == def_blk->_num_succs ) { | |
794 // Block at same level in dom-tree is not a successor. It needs a | |
795 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
796 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
797 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
798 inputs.map(k, catch_cleanup_find_cloned_def(bbs[use_blk->pred(k)->_idx], def, def_blk, bbs, n_clone_idx)); | |
799 } | |
800 | |
801 // Check to see if the use_blk already has an identical phi inserted. | |
802 // If it exists, it will be at the first position since all uses of a | |
803 // def are processed together. | |
804 Node *phi = use_blk->_nodes[1]; | |
805 if( phi->is_Phi() ) { | |
806 fixup = phi; | |
807 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
808 if (phi->in(k) != inputs[k]) { | |
809 // Not a match | |
810 fixup = NULL; | |
811 break; | |
812 } | |
813 } | |
814 } | |
815 | |
816 // If an existing PhiNode was not found, make a new one. | |
817 if (fixup == NULL) { | |
818 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
819 use_blk->_nodes.insert(1, new_phi); | |
820 bbs.map(new_phi->_idx, use_blk); | |
821 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
822 new_phi->set_req(k, inputs[k]); | |
823 } | |
824 fixup = new_phi; | |
825 } | |
826 | |
827 } else { | |
828 // Found the use just below the Catch. Make it use the clone. | |
829 fixup = use_blk->_nodes[n_clone_idx]; | |
830 } | |
831 | |
832 return fixup; | |
833 } | |
834 | |
835 //--------------------------catch_cleanup_intra_block-------------------------- | |
836 // Fix all input edges in use that reference "def". The use is in the same | |
837 // block as the def and both have been cloned in each successor block. | |
838 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
839 | |
840 // Both the use and def have been cloned. For each successor block, | |
841 // get the clone of the use, and make its input the clone of the def | |
842 // found in that block. | |
843 | |
844 uint use_idx = blk->find_node(use); | |
845 uint offset_idx = use_idx - beg; | |
846 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
847 // Get clone in each successor block | |
848 Block *sb = blk->_succs[k]; | |
849 Node *clone = sb->_nodes[offset_idx+1]; | |
850 assert( clone->Opcode() == use->Opcode(), "" ); | |
851 | |
852 // Make use-clone reference the def-clone | |
853 catch_cleanup_fix_all_inputs(clone, def, sb->_nodes[n_clone_idx]); | |
854 } | |
855 } | |
856 | |
857 //------------------------------catch_cleanup_inter_block--------------------- | |
858 // Fix all input edges in use that reference "def". The use is in a different | |
859 // block than the def. | |
860 static void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
861 if( !use_blk ) return; // Can happen if the use is a precedence edge | |
862 | |
863 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, bbs, n_clone_idx); | |
864 catch_cleanup_fix_all_inputs(use, def, new_def); | |
865 } | |
866 | |
867 //------------------------------call_catch_cleanup----------------------------- | |
868 // If we inserted any instructions between a Call and his CatchNode, | |
869 // clone the instructions on all paths below the Catch. | |
870 void Block::call_catch_cleanup(Block_Array &bbs) { | |
871 | |
872 // End of region to clone | |
873 uint end = end_idx(); | |
874 if( !_nodes[end]->is_Catch() ) return; | |
875 // Start of region to clone | |
876 uint beg = end; | |
877 while( _nodes[beg-1]->Opcode() != Op_MachProj || | |
878 !_nodes[beg-1]->in(0)->is_Call() ) { | |
879 beg--; | |
880 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
881 } | |
882 // Range of inserted instructions is [beg, end) | |
883 if( beg == end ) return; | |
884 | |
885 // Clone along all Catch output paths. Clone area between the 'beg' and | |
886 // 'end' indices. | |
887 for( uint i = 0; i < _num_succs; i++ ) { | |
888 Block *sb = _succs[i]; | |
889 // Clone the entire area; ignoring the edge fixup for now. | |
890 for( uint j = end; j > beg; j-- ) { | |
891 Node *clone = _nodes[j-1]->clone(); | |
892 sb->_nodes.insert( 1, clone ); | |
893 bbs.map(clone->_idx,sb); | |
894 } | |
895 } | |
896 | |
897 | |
898 // Fixup edges. Check the def-use info per cloned Node | |
899 for(uint i2 = beg; i2 < end; i2++ ) { | |
900 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
901 Node *n = _nodes[i2]; // Node that got cloned | |
902 // Need DU safe iterator because of edge manipulation in calls. | |
903 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
904 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
905 out->push(n->fast_out(j1)); | |
906 } | |
907 uint max = out->size(); | |
908 for (uint j = 0; j < max; j++) {// For all users | |
909 Node *use = out->pop(); | |
910 Block *buse = bbs[use->_idx]; | |
911 if( use->is_Phi() ) { | |
912 for( uint k = 1; k < use->req(); k++ ) | |
913 if( use->in(k) == n ) { | |
914 Node *fixup = catch_cleanup_find_cloned_def(bbs[buse->pred(k)->_idx], n, this, bbs, n_clone_idx); | |
915 use->set_req(k, fixup); | |
916 } | |
917 } else { | |
918 if (this == buse) { | |
919 catch_cleanup_intra_block(use, n, this, beg, n_clone_idx); | |
920 } else { | |
921 catch_cleanup_inter_block(use, buse, n, this, bbs, n_clone_idx); | |
922 } | |
923 } | |
924 } // End for all users | |
925 | |
926 } // End of for all Nodes in cloned area | |
927 | |
928 // Remove the now-dead cloned ops | |
929 for(uint i3 = beg; i3 < end; i3++ ) { | |
930 _nodes[beg]->disconnect_inputs(NULL); | |
931 _nodes.remove(beg); | |
932 } | |
933 | |
934 // If the successor blocks have a CreateEx node, move it back to the top | |
935 for(uint i4 = 0; i4 < _num_succs; i4++ ) { | |
936 Block *sb = _succs[i4]; | |
937 uint new_cnt = end - beg; | |
938 // Remove any newly created, but dead, nodes. | |
939 for( uint j = new_cnt; j > 0; j-- ) { | |
940 Node *n = sb->_nodes[j]; | |
941 if (n->outcnt() == 0 && | |
942 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
943 n->disconnect_inputs(NULL); | |
944 sb->_nodes.remove(j); | |
945 new_cnt--; | |
946 } | |
947 } | |
948 // If any newly created nodes remain, move the CreateEx node to the top | |
949 if (new_cnt > 0) { | |
950 Node *cex = sb->_nodes[1+new_cnt]; | |
951 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { | |
952 sb->_nodes.remove(1+new_cnt); | |
953 sb->_nodes.insert(1,cex); | |
954 } | |
955 } | |
956 } | |
957 } |