Mercurial > hg > graal-compiler
annotate src/share/vm/opto/lcm.cpp @ 8002:8391fdd36e1f
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author | dlong |
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date | Sun, 27 Jan 2013 01:07:09 -0800 |
parents | b30b3c2a0cf2 |
children | 571076d3c79d |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/block.hpp" | |
28 #include "opto/c2compiler.hpp" | |
29 #include "opto/callnode.hpp" | |
30 #include "opto/cfgnode.hpp" | |
31 #include "opto/machnode.hpp" | |
32 #include "opto/runtime.hpp" | |
33 #ifdef TARGET_ARCH_MODEL_x86_32 | |
34 # include "adfiles/ad_x86_32.hpp" | |
35 #endif | |
36 #ifdef TARGET_ARCH_MODEL_x86_64 | |
37 # include "adfiles/ad_x86_64.hpp" | |
38 #endif | |
39 #ifdef TARGET_ARCH_MODEL_sparc | |
40 # include "adfiles/ad_sparc.hpp" | |
41 #endif | |
42 #ifdef TARGET_ARCH_MODEL_zero | |
43 # include "adfiles/ad_zero.hpp" | |
44 #endif | |
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45 #ifdef TARGET_ARCH_MODEL_arm |
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46 # include "adfiles/ad_arm.hpp" |
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47 #endif |
3796 | 48 #ifdef TARGET_ARCH_MODEL_ppc |
49 # include "adfiles/ad_ppc.hpp" | |
50 #endif | |
0 | 51 |
1972 | 52 // Optimization - Graph Style |
0 | 53 |
54 //------------------------------implicit_null_check---------------------------- | |
55 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
56 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
57 // I can generate a memory op if there is not one nearby. | |
58 // The proj is the control projection for the not-null case. | |
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59 // The val is the pointer being checked for nullness or |
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60 // decodeHeapOop_not_null node if it did not fold into address. |
0 | 61 void Block::implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons) { |
62 // Assume if null check need for 0 offset then always needed | |
63 // Intel solaris doesn't support any null checks yet and no | |
64 // mechanism exists (yet) to set the switches at an os_cpu level | |
65 if( !ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(0)) return; | |
66 | |
67 // Make sure the ptr-is-null path appears to be uncommon! | |
68 float f = end()->as_MachIf()->_prob; | |
69 if( proj->Opcode() == Op_IfTrue ) f = 1.0f - f; | |
70 if( f > PROB_UNLIKELY_MAG(4) ) return; | |
71 | |
72 uint bidx = 0; // Capture index of value into memop | |
73 bool was_store; // Memory op is a store op | |
74 | |
75 // Get the successor block for if the test ptr is non-null | |
76 Block* not_null_block; // this one goes with the proj | |
77 Block* null_block; | |
78 if (_nodes[_nodes.size()-1] == proj) { | |
79 null_block = _succs[0]; | |
80 not_null_block = _succs[1]; | |
81 } else { | |
82 assert(_nodes[_nodes.size()-2] == proj, "proj is one or the other"); | |
83 not_null_block = _succs[0]; | |
84 null_block = _succs[1]; | |
85 } | |
332 | 86 while (null_block->is_Empty() == Block::empty_with_goto) { |
87 null_block = null_block->_succs[0]; | |
88 } | |
0 | 89 |
90 // Search the exception block for an uncommon trap. | |
91 // (See Parse::do_if and Parse::do_ifnull for the reason | |
92 // we need an uncommon trap. Briefly, we need a way to | |
93 // detect failure of this optimization, as in 6366351.) | |
94 { | |
95 bool found_trap = false; | |
96 for (uint i1 = 0; i1 < null_block->_nodes.size(); i1++) { | |
97 Node* nn = null_block->_nodes[i1]; | |
98 if (nn->is_MachCall() && | |
1748 | 99 nn->as_MachCall()->entry_point() == SharedRuntime::uncommon_trap_blob()->entry_point()) { |
0 | 100 const Type* trtype = nn->in(TypeFunc::Parms)->bottom_type(); |
101 if (trtype->isa_int() && trtype->is_int()->is_con()) { | |
102 jint tr_con = trtype->is_int()->get_con(); | |
103 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con); | |
104 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con); | |
105 assert((int)reason < (int)BitsPerInt, "recode bit map"); | |
106 if (is_set_nth_bit(allowed_reasons, (int) reason) | |
107 && action != Deoptimization::Action_none) { | |
108 // This uncommon trap is sure to recompile, eventually. | |
109 // When that happens, C->too_many_traps will prevent | |
110 // this transformation from happening again. | |
111 found_trap = true; | |
112 } | |
113 } | |
114 break; | |
115 } | |
116 } | |
117 if (!found_trap) { | |
118 // We did not find an uncommon trap. | |
119 return; | |
120 } | |
121 } | |
122 | |
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123 // Check for decodeHeapOop_not_null node which did not fold into address |
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124 bool is_decoden = ((intptr_t)val) & 1; |
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125 val = (Node*)(((intptr_t)val) & ~1); |
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126 |
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127 assert(!is_decoden || (val->in(0) == NULL) && val->is_Mach() && |
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128 (val->as_Mach()->ideal_Opcode() == Op_DecodeN), "sanity"); |
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129 |
0 | 130 // Search the successor block for a load or store who's base value is also |
131 // the tested value. There may be several. | |
132 Node_List *out = new Node_List(Thread::current()->resource_area()); | |
133 MachNode *best = NULL; // Best found so far | |
134 for (DUIterator i = val->outs(); val->has_out(i); i++) { | |
135 Node *m = val->out(i); | |
136 if( !m->is_Mach() ) continue; | |
137 MachNode *mach = m->as_Mach(); | |
138 was_store = false; | |
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139 int iop = mach->ideal_Opcode(); |
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140 switch( iop ) { |
0 | 141 case Op_LoadB: |
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142 case Op_LoadUB: |
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143 case Op_LoadUS: |
0 | 144 case Op_LoadD: |
145 case Op_LoadF: | |
146 case Op_LoadI: | |
147 case Op_LoadL: | |
148 case Op_LoadP: | |
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149 case Op_LoadN: |
0 | 150 case Op_LoadS: |
151 case Op_LoadKlass: | |
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152 case Op_LoadNKlass: |
0 | 153 case Op_LoadRange: |
154 case Op_LoadD_unaligned: | |
155 case Op_LoadL_unaligned: | |
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156 assert(mach->in(2) == val, "should be address"); |
0 | 157 break; |
158 case Op_StoreB: | |
159 case Op_StoreC: | |
160 case Op_StoreCM: | |
161 case Op_StoreD: | |
162 case Op_StoreF: | |
163 case Op_StoreI: | |
164 case Op_StoreL: | |
165 case Op_StoreP: | |
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166 case Op_StoreN: |
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167 case Op_StoreNKlass: |
0 | 168 was_store = true; // Memory op is a store op |
169 // Stores will have their address in slot 2 (memory in slot 1). | |
170 // If the value being nul-checked is in another slot, it means we | |
171 // are storing the checked value, which does NOT check the value! | |
172 if( mach->in(2) != val ) continue; | |
173 break; // Found a memory op? | |
174 case Op_StrComp: | |
681 | 175 case Op_StrEquals: |
176 case Op_StrIndexOf: | |
169
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177 case Op_AryEq: |
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178 case Op_EncodeISOArray: |
0 | 179 // Not a legit memory op for implicit null check regardless of |
180 // embedded loads | |
181 continue; | |
182 default: // Also check for embedded loads | |
183 if( !mach->needs_anti_dependence_check() ) | |
184 continue; // Not an memory op; skip it | |
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185 if( must_clone[iop] ) { |
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186 // Do not move nodes which produce flags because |
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187 // RA will try to clone it to place near branch and |
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188 // it will cause recompilation, see clone_node(). |
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189 continue; |
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190 } |
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191 { |
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192 // Check that value is used in memory address in |
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193 // instructions with embedded load (CmpP val1,(val2+off)). |
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194 Node* base; |
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195 Node* index; |
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196 const MachOper* oper = mach->memory_inputs(base, index); |
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197 if (oper == NULL || oper == (MachOper*)-1) { |
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198 continue; // Not an memory op; skip it |
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199 } |
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200 if (val == base || |
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201 val == index && val->bottom_type()->isa_narrowoop()) { |
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202 break; // Found it |
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203 } else { |
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204 continue; // Skip it |
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205 } |
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206 } |
0 | 207 break; |
208 } | |
209 // check if the offset is not too high for implicit exception | |
210 { | |
211 intptr_t offset = 0; | |
212 const TypePtr *adr_type = NULL; // Do not need this return value here | |
213 const Node* base = mach->get_base_and_disp(offset, adr_type); | |
214 if (base == NULL || base == NodeSentinel) { | |
332 | 215 // Narrow oop address doesn't have base, only index |
216 if( val->bottom_type()->isa_narrowoop() && | |
217 MacroAssembler::needs_explicit_null_check(offset) ) | |
218 continue; // Give up if offset is beyond page size | |
0 | 219 // cannot reason about it; is probably not implicit null exception |
220 } else { | |
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221 const TypePtr* tptr; |
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222 if (UseCompressedOops && Universe::narrow_oop_shift() == 0) { |
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223 // 32-bits narrow oop can be the base of address expressions |
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224 tptr = base->bottom_type()->make_ptr(); |
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225 } else { |
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226 // only regular oops are expected here |
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227 tptr = base->bottom_type()->is_ptr(); |
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228 } |
0 | 229 // Give up if offset is not a compile-time constant |
230 if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot ) | |
231 continue; | |
232 offset += tptr->_offset; // correct if base is offseted | |
233 if( MacroAssembler::needs_explicit_null_check(offset) ) | |
234 continue; // Give up is reference is beyond 4K page size | |
235 } | |
236 } | |
237 | |
238 // Check ctrl input to see if the null-check dominates the memory op | |
239 Block *cb = cfg->_bbs[mach->_idx]; | |
240 cb = cb->_idom; // Always hoist at least 1 block | |
241 if( !was_store ) { // Stores can be hoisted only one block | |
242 while( cb->_dom_depth > (_dom_depth + 1)) | |
243 cb = cb->_idom; // Hoist loads as far as we want | |
244 // The non-null-block should dominate the memory op, too. Live | |
245 // range spilling will insert a spill in the non-null-block if it is | |
246 // needs to spill the memory op for an implicit null check. | |
247 if (cb->_dom_depth == (_dom_depth + 1)) { | |
248 if (cb != not_null_block) continue; | |
249 cb = cb->_idom; | |
250 } | |
251 } | |
252 if( cb != this ) continue; | |
253 | |
254 // Found a memory user; see if it can be hoisted to check-block | |
255 uint vidx = 0; // Capture index of value into memop | |
256 uint j; | |
257 for( j = mach->req()-1; j > 0; j-- ) { | |
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258 if( mach->in(j) == val ) { |
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259 vidx = j; |
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260 // Ignore DecodeN val which could be hoisted to where needed. |
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261 if( is_decoden ) continue; |
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262 } |
0 | 263 // Block of memory-op input |
264 Block *inb = cfg->_bbs[mach->in(j)->_idx]; | |
265 Block *b = this; // Start from nul check | |
266 while( b != inb && b->_dom_depth > inb->_dom_depth ) | |
267 b = b->_idom; // search upwards for input | |
268 // See if input dominates null check | |
269 if( b != inb ) | |
270 break; | |
271 } | |
272 if( j > 0 ) | |
273 continue; | |
274 Block *mb = cfg->_bbs[mach->_idx]; | |
275 // Hoisting stores requires more checks for the anti-dependence case. | |
276 // Give up hoisting if we have to move the store past any load. | |
277 if( was_store ) { | |
278 Block *b = mb; // Start searching here for a local load | |
279 // mach use (faulting) trying to hoist | |
280 // n might be blocker to hoisting | |
281 while( b != this ) { | |
282 uint k; | |
283 for( k = 1; k < b->_nodes.size(); k++ ) { | |
284 Node *n = b->_nodes[k]; | |
285 if( n->needs_anti_dependence_check() && | |
286 n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) ) | |
287 break; // Found anti-dependent load | |
288 } | |
289 if( k < b->_nodes.size() ) | |
290 break; // Found anti-dependent load | |
291 // Make sure control does not do a merge (would have to check allpaths) | |
292 if( b->num_preds() != 2 ) break; | |
293 b = cfg->_bbs[b->pred(1)->_idx]; // Move up to predecessor block | |
294 } | |
295 if( b != this ) continue; | |
296 } | |
297 | |
298 // Make sure this memory op is not already being used for a NullCheck | |
299 Node *e = mb->end(); | |
300 if( e->is_MachNullCheck() && e->in(1) == mach ) | |
301 continue; // Already being used as a NULL check | |
302 | |
303 // Found a candidate! Pick one with least dom depth - the highest | |
304 // in the dom tree should be closest to the null check. | |
305 if( !best || | |
306 cfg->_bbs[mach->_idx]->_dom_depth < cfg->_bbs[best->_idx]->_dom_depth ) { | |
307 best = mach; | |
308 bidx = vidx; | |
309 | |
310 } | |
311 } | |
312 // No candidate! | |
313 if( !best ) return; | |
314 | |
315 // ---- Found an implicit null check | |
316 extern int implicit_null_checks; | |
317 implicit_null_checks++; | |
318 | |
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319 if( is_decoden ) { |
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320 // Check if we need to hoist decodeHeapOop_not_null first. |
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321 Block *valb = cfg->_bbs[val->_idx]; |
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322 if( this != valb && this->_dom_depth < valb->_dom_depth ) { |
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323 // Hoist it up to the end of the test block. |
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324 valb->find_remove(val); |
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325 this->add_inst(val); |
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326 cfg->_bbs.map(val->_idx,this); |
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327 // DecodeN on x86 may kill flags. Check for flag-killing projections |
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328 // that also need to be hoisted. |
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329 for (DUIterator_Fast jmax, j = val->fast_outs(jmax); j < jmax; j++) { |
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330 Node* n = val->fast_out(j); |
3842 | 331 if( n->is_MachProj() ) { |
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332 cfg->_bbs[n->_idx]->find_remove(n); |
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333 this->add_inst(n); |
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334 cfg->_bbs.map(n->_idx,this); |
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335 } |
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336 } |
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337 } |
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338 } |
0 | 339 // Hoist the memory candidate up to the end of the test block. |
340 Block *old_block = cfg->_bbs[best->_idx]; | |
341 old_block->find_remove(best); | |
342 add_inst(best); | |
343 cfg->_bbs.map(best->_idx,this); | |
344 | |
345 // Move the control dependence | |
346 if (best->in(0) && best->in(0) == old_block->_nodes[0]) | |
347 best->set_req(0, _nodes[0]); | |
348 | |
349 // Check for flag-killing projections that also need to be hoisted | |
350 // Should be DU safe because no edge updates. | |
351 for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) { | |
352 Node* n = best->fast_out(j); | |
3842 | 353 if( n->is_MachProj() ) { |
0 | 354 cfg->_bbs[n->_idx]->find_remove(n); |
355 add_inst(n); | |
356 cfg->_bbs.map(n->_idx,this); | |
357 } | |
358 } | |
359 | |
360 Compile *C = cfg->C; | |
361 // proj==Op_True --> ne test; proj==Op_False --> eq test. | |
362 // One of two graph shapes got matched: | |
363 // (IfTrue (If (Bool NE (CmpP ptr NULL)))) | |
364 // (IfFalse (If (Bool EQ (CmpP ptr NULL)))) | |
365 // NULL checks are always branch-if-eq. If we see a IfTrue projection | |
366 // then we are replacing a 'ne' test with a 'eq' NULL check test. | |
367 // We need to flip the projections to keep the same semantics. | |
368 if( proj->Opcode() == Op_IfTrue ) { | |
369 // Swap order of projections in basic block to swap branch targets | |
370 Node *tmp1 = _nodes[end_idx()+1]; | |
371 Node *tmp2 = _nodes[end_idx()+2]; | |
372 _nodes.map(end_idx()+1, tmp2); | |
373 _nodes.map(end_idx()+2, tmp1); | |
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374 Node *tmp = new (C) Node(C->top()); // Use not NULL input |
0 | 375 tmp1->replace_by(tmp); |
376 tmp2->replace_by(tmp1); | |
377 tmp->replace_by(tmp2); | |
378 tmp->destruct(); | |
379 } | |
380 | |
381 // Remove the existing null check; use a new implicit null check instead. | |
382 // Since schedule-local needs precise def-use info, we need to correct | |
383 // it as well. | |
384 Node *old_tst = proj->in(0); | |
385 MachNode *nul_chk = new (C) MachNullCheckNode(old_tst->in(0),best,bidx); | |
386 _nodes.map(end_idx(),nul_chk); | |
387 cfg->_bbs.map(nul_chk->_idx,this); | |
388 // Redirect users of old_test to nul_chk | |
389 for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2) | |
390 old_tst->last_out(i2)->set_req(0, nul_chk); | |
391 // Clean-up any dead code | |
392 for (uint i3 = 0; i3 < old_tst->req(); i3++) | |
393 old_tst->set_req(i3, NULL); | |
394 | |
395 cfg->latency_from_uses(nul_chk); | |
396 cfg->latency_from_uses(best); | |
397 } | |
398 | |
399 | |
400 //------------------------------select----------------------------------------- | |
401 // Select a nice fellow from the worklist to schedule next. If there is only | |
402 // one choice, then use it. Projections take top priority for correctness | |
403 // reasons - if I see a projection, then it is next. There are a number of | |
404 // other special cases, for instructions that consume condition codes, et al. | |
405 // These are chosen immediately. Some instructions are required to immediately | |
406 // precede the last instruction in the block, and these are taken last. Of the | |
407 // remaining cases (most), choose the instruction with the greatest latency | |
408 // (that is, the most number of pseudo-cycles required to the end of the | |
409 // routine). If there is a tie, choose the instruction with the most inputs. | |
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410 Node *Block::select(PhaseCFG *cfg, Node_List &worklist, GrowableArray<int> &ready_cnt, VectorSet &next_call, uint sched_slot) { |
0 | 411 |
412 // If only a single entry on the stack, use it | |
413 uint cnt = worklist.size(); | |
414 if (cnt == 1) { | |
415 Node *n = worklist[0]; | |
416 worklist.map(0,worklist.pop()); | |
417 return n; | |
418 } | |
419 | |
420 uint choice = 0; // Bigger is most important | |
421 uint latency = 0; // Bigger is scheduled first | |
422 uint score = 0; // Bigger is better | |
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423 int idx = -1; // Index in worklist |
0 | 424 |
425 for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist | |
426 // Order in worklist is used to break ties. | |
427 // See caller for how this is used to delay scheduling | |
428 // of induction variable increments to after the other | |
429 // uses of the phi are scheduled. | |
430 Node *n = worklist[i]; // Get Node on worklist | |
431 | |
432 int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0; | |
433 if( n->is_Proj() || // Projections always win | |
434 n->Opcode()== Op_Con || // So does constant 'Top' | |
435 iop == Op_CreateEx || // Create-exception must start block | |
436 iop == Op_CheckCastPP | |
437 ) { | |
438 worklist.map(i,worklist.pop()); | |
439 return n; | |
440 } | |
441 | |
442 // Final call in a block must be adjacent to 'catch' | |
443 Node *e = end(); | |
444 if( e->is_Catch() && e->in(0)->in(0) == n ) | |
445 continue; | |
446 | |
447 // Memory op for an implicit null check has to be at the end of the block | |
448 if( e->is_MachNullCheck() && e->in(1) == n ) | |
449 continue; | |
450 | |
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451 // Schedule IV increment last. |
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452 if (e->is_Mach() && e->as_Mach()->ideal_Opcode() == Op_CountedLoopEnd && |
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453 e->in(1)->in(1) == n && n->is_iteratively_computed()) |
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454 continue; |
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455 |
0 | 456 uint n_choice = 2; |
457 | |
458 // See if this instruction is consumed by a branch. If so, then (as the | |
459 // branch is the last instruction in the basic block) force it to the | |
460 // end of the basic block | |
461 if ( must_clone[iop] ) { | |
462 // See if any use is a branch | |
463 bool found_machif = false; | |
464 | |
465 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
466 Node* use = n->fast_out(j); | |
467 | |
468 // The use is a conditional branch, make them adjacent | |
469 if (use->is_MachIf() && cfg->_bbs[use->_idx]==this ) { | |
470 found_machif = true; | |
471 break; | |
472 } | |
473 | |
474 // More than this instruction pending for successor to be ready, | |
475 // don't choose this if other opportunities are ready | |
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476 if (ready_cnt.at(use->_idx) > 1) |
0 | 477 n_choice = 1; |
478 } | |
479 | |
480 // loop terminated, prefer not to use this instruction | |
481 if (found_machif) | |
482 continue; | |
483 } | |
484 | |
485 // See if this has a predecessor that is "must_clone", i.e. sets the | |
486 // condition code. If so, choose this first | |
487 for (uint j = 0; j < n->req() ; j++) { | |
488 Node *inn = n->in(j); | |
489 if (inn) { | |
490 if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) { | |
491 n_choice = 3; | |
492 break; | |
493 } | |
494 } | |
495 } | |
496 | |
497 // MachTemps should be scheduled last so they are near their uses | |
498 if (n->is_MachTemp()) { | |
499 n_choice = 1; | |
500 } | |
501 | |
1685 | 502 uint n_latency = cfg->_node_latency->at_grow(n->_idx); |
0 | 503 uint n_score = n->req(); // Many inputs get high score to break ties |
504 | |
505 // Keep best latency found | |
506 if( choice < n_choice || | |
507 ( choice == n_choice && | |
508 ( latency < n_latency || | |
509 ( latency == n_latency && | |
510 ( score < n_score ))))) { | |
511 choice = n_choice; | |
512 latency = n_latency; | |
513 score = n_score; | |
514 idx = i; // Also keep index in worklist | |
515 } | |
516 } // End of for all ready nodes in worklist | |
517 | |
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518 assert(idx >= 0, "index should be set"); |
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519 Node *n = worklist[(uint)idx]; // Get the winner |
0 | 520 |
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521 worklist.map((uint)idx, worklist.pop()); // Compress worklist |
0 | 522 return n; |
523 } | |
524 | |
525 | |
526 //------------------------------set_next_call---------------------------------- | |
527 void Block::set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ) { | |
528 if( next_call.test_set(n->_idx) ) return; | |
529 for( uint i=0; i<n->len(); i++ ) { | |
530 Node *m = n->in(i); | |
531 if( !m ) continue; // must see all nodes in block that precede call | |
532 if( bbs[m->_idx] == this ) | |
533 set_next_call( m, next_call, bbs ); | |
534 } | |
535 } | |
536 | |
537 //------------------------------needed_for_next_call--------------------------- | |
538 // Set the flag 'next_call' for each Node that is needed for the next call to | |
539 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
540 // next subroutine call get priority - basically it moves things NOT needed | |
541 // for the next call till after the call. This prevents me from trying to | |
542 // carry lots of stuff live across a call. | |
543 void Block::needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs) { | |
544 // Find the next control-defining Node in this block | |
545 Node* call = NULL; | |
546 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
547 Node* m = this_call->fast_out(i); | |
548 if( bbs[m->_idx] == this && // Local-block user | |
549 m != this_call && // Not self-start node | |
3842 | 550 m->is_MachCall() ) |
0 | 551 call = m; |
552 break; | |
553 } | |
554 if (call == NULL) return; // No next call (e.g., block end is near) | |
555 // Set next-call for all inputs to this call | |
556 set_next_call(call, next_call, bbs); | |
557 } | |
558 | |
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559 //------------------------------add_call_kills------------------------------------- |
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560 void Block::add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe) { |
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561 // Fill in the kill mask for the call |
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562 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { |
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563 if( !regs.Member(r) ) { // Not already defined by the call |
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564 // Save-on-call register? |
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565 if ((save_policy[r] == 'C') || |
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566 (save_policy[r] == 'A') || |
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567 ((save_policy[r] == 'E') && exclude_soe)) { |
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568 proj->_rout.Insert(r); |
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569 } |
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570 } |
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571 } |
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572 } |
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573 |
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574 |
0 | 575 //------------------------------sched_call------------------------------------- |
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576 uint Block::sched_call( Matcher &matcher, Block_Array &bbs, uint node_cnt, Node_List &worklist, GrowableArray<int> &ready_cnt, MachCallNode *mcall, VectorSet &next_call ) { |
0 | 577 RegMask regs; |
578 | |
579 // Schedule all the users of the call right now. All the users are | |
580 // projection Nodes, so they must be scheduled next to the call. | |
581 // Collect all the defined registers. | |
582 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
583 Node* n = mcall->fast_out(i); | |
3842 | 584 assert( n->is_MachProj(), "" ); |
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585 int n_cnt = ready_cnt.at(n->_idx)-1; |
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586 ready_cnt.at_put(n->_idx, n_cnt); |
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587 assert( n_cnt == 0, "" ); |
0 | 588 // Schedule next to call |
589 _nodes.map(node_cnt++, n); | |
590 // Collect defined registers | |
591 regs.OR(n->out_RegMask()); | |
592 // Check for scheduling the next control-definer | |
593 if( n->bottom_type() == Type::CONTROL ) | |
594 // Warm up next pile of heuristic bits | |
595 needed_for_next_call(n, next_call, bbs); | |
596 | |
597 // Children of projections are now all ready | |
598 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
599 Node* m = n->fast_out(j); // Get user | |
600 if( bbs[m->_idx] != this ) continue; | |
601 if( m->is_Phi() ) continue; | |
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602 int m_cnt = ready_cnt.at(m->_idx)-1; |
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603 ready_cnt.at_put(m->_idx, m_cnt); |
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604 if( m_cnt == 0 ) |
0 | 605 worklist.push(m); |
606 } | |
607 | |
608 } | |
609 | |
610 // Act as if the call defines the Frame Pointer. | |
611 // Certainly the FP is alive and well after the call. | |
612 regs.Insert(matcher.c_frame_pointer()); | |
613 | |
614 // Set all registers killed and not already defined by the call. | |
615 uint r_cnt = mcall->tf()->range()->cnt(); | |
616 int op = mcall->ideal_Opcode(); | |
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617 MachProjNode *proj = new (matcher.C) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); |
0 | 618 bbs.map(proj->_idx,this); |
619 _nodes.insert(node_cnt++, proj); | |
620 | |
621 // Select the right register save policy. | |
622 const char * save_policy; | |
623 switch (op) { | |
624 case Op_CallRuntime: | |
625 case Op_CallLeaf: | |
626 case Op_CallLeafNoFP: | |
627 // Calling C code so use C calling convention | |
628 save_policy = matcher._c_reg_save_policy; | |
629 break; | |
630 | |
631 case Op_CallStaticJava: | |
632 case Op_CallDynamicJava: | |
633 // Calling Java code so use Java calling convention | |
634 save_policy = matcher._register_save_policy; | |
635 break; | |
636 | |
637 default: | |
638 ShouldNotReachHere(); | |
639 } | |
640 | |
641 // When using CallRuntime mark SOE registers as killed by the call | |
642 // so values that could show up in the RegisterMap aren't live in a | |
643 // callee saved register since the register wouldn't know where to | |
644 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
645 // have debug info on them. Strictly speaking this only needs to be | |
646 // done for oops since idealreg2debugmask takes care of debug info | |
647 // references but there no way to handle oops differently than other | |
648 // pointers as far as the kill mask goes. | |
649 bool exclude_soe = op == Op_CallRuntime; | |
650 | |
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651 // If the call is a MethodHandle invoke, we need to exclude the |
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652 // register which is used to save the SP value over MH invokes from |
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653 // the mask. Otherwise this register could be used for |
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654 // deoptimization information. |
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655 if (op == Op_CallStaticJava) { |
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656 MachCallStaticJavaNode* mcallstaticjava = (MachCallStaticJavaNode*) mcall; |
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657 if (mcallstaticjava->_method_handle_invoke) |
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658 proj->_rout.OR(Matcher::method_handle_invoke_SP_save_mask()); |
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659 } |
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660 |
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661 add_call_kills(proj, regs, save_policy, exclude_soe); |
0 | 662 |
663 return node_cnt; | |
664 } | |
665 | |
666 | |
667 //------------------------------schedule_local--------------------------------- | |
668 // Topological sort within a block. Someday become a real scheduler. | |
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669 bool Block::schedule_local(PhaseCFG *cfg, Matcher &matcher, GrowableArray<int> &ready_cnt, VectorSet &next_call) { |
0 | 670 // Already "sorted" are the block start Node (as the first entry), and |
671 // the block-ending Node and any trailing control projections. We leave | |
672 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
673 // Node. Everything else gets topo-sorted. | |
674 | |
675 #ifndef PRODUCT | |
676 if (cfg->trace_opto_pipelining()) { | |
677 tty->print_cr("# --- schedule_local B%d, before: ---", _pre_order); | |
678 for (uint i = 0;i < _nodes.size();i++) { | |
679 tty->print("# "); | |
680 _nodes[i]->fast_dump(); | |
681 } | |
682 tty->print_cr("#"); | |
683 } | |
684 #endif | |
685 | |
686 // RootNode is already sorted | |
687 if( _nodes.size() == 1 ) return true; | |
688 | |
689 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
690 uint node_cnt = end_idx(); | |
691 uint phi_cnt = 1; | |
692 uint i; | |
693 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
694 Node *n = _nodes[i]; | |
695 if( n->is_Phi() || // Found a PhiNode or ParmNode | |
696 (n->is_Proj() && n->in(0) == head()) ) { | |
697 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt | |
698 _nodes.map(i,_nodes[phi_cnt]); | |
699 _nodes.map(phi_cnt++,n); // swap Phi/Parm up front | |
700 } else { // All others | |
701 // Count block-local inputs to 'n' | |
702 uint cnt = n->len(); // Input count | |
703 uint local = 0; | |
704 for( uint j=0; j<cnt; j++ ) { | |
705 Node *m = n->in(j); | |
706 if( m && cfg->_bbs[m->_idx] == this && !m->is_top() ) | |
707 local++; // One more block-local input | |
708 } | |
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709 ready_cnt.at_put(n->_idx, local); // Count em up |
0 | 710 |
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711 #ifdef ASSERT |
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712 if( UseConcMarkSweepGC || UseG1GC ) { |
0 | 713 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) { |
3248
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714 // Check the precedence edges |
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715 for (uint prec = n->req(); prec < n->len(); prec++) { |
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716 Node* oop_store = n->in(prec); |
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717 if (oop_store != NULL) { |
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718 assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark"); |
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719 } |
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720 } |
0 | 721 } |
722 } | |
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723 #endif |
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724 |
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725 // A few node types require changing a required edge to a precedence edge |
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726 // before allocation. |
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727 if( n->is_Mach() && n->req() > TypeFunc::Parms && |
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728 (n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire || |
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729 n->as_Mach()->ideal_Opcode() == Op_MemBarVolatile) ) { |
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730 // MemBarAcquire could be created without Precedent edge. |
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731 // del_req() replaces the specified edge with the last input edge |
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732 // and then removes the last edge. If the specified edge > number of |
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733 // edges the last edge will be moved outside of the input edges array |
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734 // and the edge will be lost. This is why this code should be |
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735 // executed only when Precedent (== TypeFunc::Parms) edge is present. |
0 | 736 Node *x = n->in(TypeFunc::Parms); |
737 n->del_req(TypeFunc::Parms); | |
738 n->add_prec(x); | |
739 } | |
740 } | |
741 } | |
742 for(uint i2=i; i2<_nodes.size(); i2++ ) // Trailing guys get zapped count | |
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743 ready_cnt.at_put(_nodes[i2]->_idx, 0); |
0 | 744 |
745 // All the prescheduled guys do not hold back internal nodes | |
746 uint i3; | |
747 for(i3 = 0; i3<phi_cnt; i3++ ) { // For all pre-scheduled | |
748 Node *n = _nodes[i3]; // Get pre-scheduled | |
749 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
750 Node* m = n->fast_out(j); | |
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751 if( cfg->_bbs[m->_idx] ==this ) { // Local-block user |
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752 int m_cnt = ready_cnt.at(m->_idx)-1; |
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753 ready_cnt.at_put(m->_idx, m_cnt); // Fix ready count |
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754 } |
0 | 755 } |
756 } | |
757 | |
758 Node_List delay; | |
759 // Make a worklist | |
760 Node_List worklist; | |
761 for(uint i4=i3; i4<node_cnt; i4++ ) { // Put ready guys on worklist | |
762 Node *m = _nodes[i4]; | |
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763 if( !ready_cnt.at(m->_idx) ) { // Zero ready count? |
0 | 764 if (m->is_iteratively_computed()) { |
765 // Push induction variable increments last to allow other uses | |
766 // of the phi to be scheduled first. The select() method breaks | |
767 // ties in scheduling by worklist order. | |
768 delay.push(m); | |
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769 } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) { |
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770 // Force the CreateEx to the top of the list so it's processed |
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771 // first and ends up at the start of the block. |
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772 worklist.insert(0, m); |
0 | 773 } else { |
774 worklist.push(m); // Then on to worklist! | |
775 } | |
776 } | |
777 } | |
778 while (delay.size()) { | |
779 Node* d = delay.pop(); | |
780 worklist.push(d); | |
781 } | |
782 | |
783 // Warm up the 'next_call' heuristic bits | |
784 needed_for_next_call(_nodes[0], next_call, cfg->_bbs); | |
785 | |
786 #ifndef PRODUCT | |
787 if (cfg->trace_opto_pipelining()) { | |
788 for (uint j=0; j<_nodes.size(); j++) { | |
789 Node *n = _nodes[j]; | |
790 int idx = n->_idx; | |
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791 tty->print("# ready cnt:%3d ", ready_cnt.at(idx)); |
1685 | 792 tty->print("latency:%3d ", cfg->_node_latency->at_grow(idx)); |
0 | 793 tty->print("%4d: %s\n", idx, n->Name()); |
794 } | |
795 } | |
796 #endif | |
797 | |
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798 uint max_idx = (uint)ready_cnt.length(); |
0 | 799 // Pull from worklist and schedule |
800 while( worklist.size() ) { // Worklist is not ready | |
801 | |
802 #ifndef PRODUCT | |
803 if (cfg->trace_opto_pipelining()) { | |
804 tty->print("# ready list:"); | |
805 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
806 Node *n = worklist[i]; // Get Node on worklist | |
807 tty->print(" %d", n->_idx); | |
808 } | |
809 tty->cr(); | |
810 } | |
811 #endif | |
812 | |
813 // Select and pop a ready guy from worklist | |
814 Node* n = select(cfg, worklist, ready_cnt, next_call, phi_cnt); | |
815 _nodes.map(phi_cnt++,n); // Schedule him next | |
816 | |
817 #ifndef PRODUCT | |
818 if (cfg->trace_opto_pipelining()) { | |
819 tty->print("# select %d: %s", n->_idx, n->Name()); | |
1685 | 820 tty->print(", latency:%d", cfg->_node_latency->at_grow(n->_idx)); |
0 | 821 n->dump(); |
822 if (Verbose) { | |
823 tty->print("# ready list:"); | |
824 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
825 Node *n = worklist[i]; // Get Node on worklist | |
826 tty->print(" %d", n->_idx); | |
827 } | |
828 tty->cr(); | |
829 } | |
830 } | |
831 | |
832 #endif | |
833 if( n->is_MachCall() ) { | |
834 MachCallNode *mcall = n->as_MachCall(); | |
835 phi_cnt = sched_call(matcher, cfg->_bbs, phi_cnt, worklist, ready_cnt, mcall, next_call); | |
836 continue; | |
837 } | |
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838 |
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839 if (n->is_Mach() && n->as_Mach()->has_call()) { |
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840 RegMask regs; |
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841 regs.Insert(matcher.c_frame_pointer()); |
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842 regs.OR(n->out_RegMask()); |
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843 |
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844 MachProjNode *proj = new (matcher.C) MachProjNode( n, 1, RegMask::Empty, MachProjNode::fat_proj ); |
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845 cfg->_bbs.map(proj->_idx,this); |
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846 _nodes.insert(phi_cnt++, proj); |
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847 |
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848 add_call_kills(proj, regs, matcher._c_reg_save_policy, false); |
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849 } |
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850 |
0 | 851 // Children are now all ready |
852 for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) { | |
853 Node* m = n->fast_out(i5); // Get user | |
854 if( cfg->_bbs[m->_idx] != this ) continue; | |
855 if( m->is_Phi() ) continue; | |
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856 if (m->_idx >= max_idx) { // new node, skip it |
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857 assert(m->is_MachProj() && n->is_Mach() && n->as_Mach()->has_call(), "unexpected node types"); |
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858 continue; |
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859 } |
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860 int m_cnt = ready_cnt.at(m->_idx)-1; |
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861 ready_cnt.at_put(m->_idx, m_cnt); |
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862 if( m_cnt == 0 ) |
0 | 863 worklist.push(m); |
864 } | |
865 } | |
866 | |
867 if( phi_cnt != end_idx() ) { | |
868 // did not schedule all. Retry, Bailout, or Die | |
869 Compile* C = matcher.C; | |
870 if (C->subsume_loads() == true && !C->failing()) { | |
871 // Retry with subsume_loads == false | |
872 // If this is the first failure, the sentinel string will "stick" | |
873 // to the Compile object, and the C2Compiler will see it and retry. | |
874 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
875 } | |
876 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
877 return false; | |
878 } | |
879 | |
880 #ifndef PRODUCT | |
881 if (cfg->trace_opto_pipelining()) { | |
882 tty->print_cr("#"); | |
883 tty->print_cr("# after schedule_local"); | |
884 for (uint i = 0;i < _nodes.size();i++) { | |
885 tty->print("# "); | |
886 _nodes[i]->fast_dump(); | |
887 } | |
888 tty->cr(); | |
889 } | |
890 #endif | |
891 | |
892 | |
893 return true; | |
894 } | |
895 | |
896 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
897 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
898 for (uint l = 0; l < use->len(); l++) { | |
899 if (use->in(l) == old_def) { | |
900 if (l < use->req()) { | |
901 use->set_req(l, new_def); | |
902 } else { | |
903 use->rm_prec(l); | |
904 use->add_prec(new_def); | |
905 l--; | |
906 } | |
907 } | |
908 } | |
909 } | |
910 | |
911 //------------------------------catch_cleanup_find_cloned_def------------------ | |
912 static Node *catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
913 assert( use_blk != def_blk, "Inter-block cleanup only"); | |
914 | |
915 // The use is some block below the Catch. Find and return the clone of the def | |
916 // that dominates the use. If there is no clone in a dominating block, then | |
917 // create a phi for the def in a dominating block. | |
918 | |
919 // Find which successor block dominates this use. The successor | |
920 // blocks must all be single-entry (from the Catch only; I will have | |
921 // split blocks to make this so), hence they all dominate. | |
922 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
923 use_blk = use_blk->_idom; | |
924 | |
925 // Find the successor | |
926 Node *fixup = NULL; | |
927 | |
928 uint j; | |
929 for( j = 0; j < def_blk->_num_succs; j++ ) | |
930 if( use_blk == def_blk->_succs[j] ) | |
931 break; | |
932 | |
933 if( j == def_blk->_num_succs ) { | |
934 // Block at same level in dom-tree is not a successor. It needs a | |
935 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
936 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
937 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
938 inputs.map(k, catch_cleanup_find_cloned_def(bbs[use_blk->pred(k)->_idx], def, def_blk, bbs, n_clone_idx)); | |
939 } | |
940 | |
941 // Check to see if the use_blk already has an identical phi inserted. | |
942 // If it exists, it will be at the first position since all uses of a | |
943 // def are processed together. | |
944 Node *phi = use_blk->_nodes[1]; | |
945 if( phi->is_Phi() ) { | |
946 fixup = phi; | |
947 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
948 if (phi->in(k) != inputs[k]) { | |
949 // Not a match | |
950 fixup = NULL; | |
951 break; | |
952 } | |
953 } | |
954 } | |
955 | |
956 // If an existing PhiNode was not found, make a new one. | |
957 if (fixup == NULL) { | |
958 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
959 use_blk->_nodes.insert(1, new_phi); | |
960 bbs.map(new_phi->_idx, use_blk); | |
961 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
962 new_phi->set_req(k, inputs[k]); | |
963 } | |
964 fixup = new_phi; | |
965 } | |
966 | |
967 } else { | |
968 // Found the use just below the Catch. Make it use the clone. | |
969 fixup = use_blk->_nodes[n_clone_idx]; | |
970 } | |
971 | |
972 return fixup; | |
973 } | |
974 | |
975 //--------------------------catch_cleanup_intra_block-------------------------- | |
976 // Fix all input edges in use that reference "def". The use is in the same | |
977 // block as the def and both have been cloned in each successor block. | |
978 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
979 | |
980 // Both the use and def have been cloned. For each successor block, | |
981 // get the clone of the use, and make its input the clone of the def | |
982 // found in that block. | |
983 | |
984 uint use_idx = blk->find_node(use); | |
985 uint offset_idx = use_idx - beg; | |
986 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
987 // Get clone in each successor block | |
988 Block *sb = blk->_succs[k]; | |
989 Node *clone = sb->_nodes[offset_idx+1]; | |
990 assert( clone->Opcode() == use->Opcode(), "" ); | |
991 | |
992 // Make use-clone reference the def-clone | |
993 catch_cleanup_fix_all_inputs(clone, def, sb->_nodes[n_clone_idx]); | |
994 } | |
995 } | |
996 | |
997 //------------------------------catch_cleanup_inter_block--------------------- | |
998 // Fix all input edges in use that reference "def". The use is in a different | |
999 // block than the def. | |
1000 static void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
1001 if( !use_blk ) return; // Can happen if the use is a precedence edge | |
1002 | |
1003 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, bbs, n_clone_idx); | |
1004 catch_cleanup_fix_all_inputs(use, def, new_def); | |
1005 } | |
1006 | |
1007 //------------------------------call_catch_cleanup----------------------------- | |
1008 // If we inserted any instructions between a Call and his CatchNode, | |
1009 // clone the instructions on all paths below the Catch. | |
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1010 void Block::call_catch_cleanup(Block_Array &bbs, Compile* C) { |
0 | 1011 |
1012 // End of region to clone | |
1013 uint end = end_idx(); | |
1014 if( !_nodes[end]->is_Catch() ) return; | |
1015 // Start of region to clone | |
1016 uint beg = end; | |
3842 | 1017 while(!_nodes[beg-1]->is_MachProj() || |
1018 !_nodes[beg-1]->in(0)->is_MachCall() ) { | |
0 | 1019 beg--; |
1020 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
1021 } | |
1022 // Range of inserted instructions is [beg, end) | |
1023 if( beg == end ) return; | |
1024 | |
1025 // Clone along all Catch output paths. Clone area between the 'beg' and | |
1026 // 'end' indices. | |
1027 for( uint i = 0; i < _num_succs; i++ ) { | |
1028 Block *sb = _succs[i]; | |
1029 // Clone the entire area; ignoring the edge fixup for now. | |
1030 for( uint j = end; j > beg; j-- ) { | |
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1031 // It is safe here to clone a node with anti_dependence |
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1032 // since clones dominate on each path. |
0 | 1033 Node *clone = _nodes[j-1]->clone(); |
1034 sb->_nodes.insert( 1, clone ); | |
1035 bbs.map(clone->_idx,sb); | |
1036 } | |
1037 } | |
1038 | |
1039 | |
1040 // Fixup edges. Check the def-use info per cloned Node | |
1041 for(uint i2 = beg; i2 < end; i2++ ) { | |
1042 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
1043 Node *n = _nodes[i2]; // Node that got cloned | |
1044 // Need DU safe iterator because of edge manipulation in calls. | |
1045 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
1046 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
1047 out->push(n->fast_out(j1)); | |
1048 } | |
1049 uint max = out->size(); | |
1050 for (uint j = 0; j < max; j++) {// For all users | |
1051 Node *use = out->pop(); | |
1052 Block *buse = bbs[use->_idx]; | |
1053 if( use->is_Phi() ) { | |
1054 for( uint k = 1; k < use->req(); k++ ) | |
1055 if( use->in(k) == n ) { | |
1056 Node *fixup = catch_cleanup_find_cloned_def(bbs[buse->pred(k)->_idx], n, this, bbs, n_clone_idx); | |
1057 use->set_req(k, fixup); | |
1058 } | |
1059 } else { | |
1060 if (this == buse) { | |
1061 catch_cleanup_intra_block(use, n, this, beg, n_clone_idx); | |
1062 } else { | |
1063 catch_cleanup_inter_block(use, buse, n, this, bbs, n_clone_idx); | |
1064 } | |
1065 } | |
1066 } // End for all users | |
1067 | |
1068 } // End of for all Nodes in cloned area | |
1069 | |
1070 // Remove the now-dead cloned ops | |
1071 for(uint i3 = beg; i3 < end; i3++ ) { | |
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1072 _nodes[beg]->disconnect_inputs(NULL, C); |
0 | 1073 _nodes.remove(beg); |
1074 } | |
1075 | |
1076 // If the successor blocks have a CreateEx node, move it back to the top | |
1077 for(uint i4 = 0; i4 < _num_succs; i4++ ) { | |
1078 Block *sb = _succs[i4]; | |
1079 uint new_cnt = end - beg; | |
1080 // Remove any newly created, but dead, nodes. | |
1081 for( uint j = new_cnt; j > 0; j-- ) { | |
1082 Node *n = sb->_nodes[j]; | |
1083 if (n->outcnt() == 0 && | |
1084 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
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1085 n->disconnect_inputs(NULL, C); |
0 | 1086 sb->_nodes.remove(j); |
1087 new_cnt--; | |
1088 } | |
1089 } | |
1090 // If any newly created nodes remain, move the CreateEx node to the top | |
1091 if (new_cnt > 0) { | |
1092 Node *cex = sb->_nodes[1+new_cnt]; | |
1093 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { | |
1094 sb->_nodes.remove(1+new_cnt); | |
1095 sb->_nodes.insert(1,cex); | |
1096 } | |
1097 } | |
1098 } | |
1099 } |