Mercurial > hg > truffle
annotate src/share/vm/opto/lcm.cpp @ 14397:53fa76359eb1
8016696: PPC64 (part 4): add relocation for trampoline stubs
Summary: A trampoline allows to encode a small branch in the code, even if there is the chance that this branch can not reach all possible code locations. If the relocation finds that a branch is too far for the instruction in the code, it can patch it to jump to the trampoline where is sufficient space for a far branch. Needed on PPC.
Reviewed-by: kvn, bdelsart, jrose
author | goetz |
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date | Thu, 04 Jul 2013 10:51:31 +0200 |
parents | d2907f74462e |
children | e2722a66aba7 |
rev | line source |
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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 |
14391 | 48 #ifdef TARGET_ARCH_MODEL_ppc_32 |
49 # include "adfiles/ad_ppc_32.hpp" | |
50 #endif | |
51 #ifdef TARGET_ARCH_MODEL_ppc_64 | |
52 # include "adfiles/ad_ppc_64.hpp" | |
3796 | 53 #endif |
0 | 54 |
1972 | 55 // Optimization - Graph Style |
0 | 56 |
57 //------------------------------implicit_null_check---------------------------- | |
58 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
59 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
60 // I can generate a memory op if there is not one nearby. | |
61 // The proj is the control projection for the not-null case. | |
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62 // The val is the pointer being checked for nullness or |
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63 // decodeHeapOop_not_null node if it did not fold into address. |
0 | 64 void Block::implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons) { |
65 // Assume if null check need for 0 offset then always needed | |
66 // Intel solaris doesn't support any null checks yet and no | |
67 // mechanism exists (yet) to set the switches at an os_cpu level | |
68 if( !ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(0)) return; | |
69 | |
70 // Make sure the ptr-is-null path appears to be uncommon! | |
71 float f = end()->as_MachIf()->_prob; | |
72 if( proj->Opcode() == Op_IfTrue ) f = 1.0f - f; | |
73 if( f > PROB_UNLIKELY_MAG(4) ) return; | |
74 | |
75 uint bidx = 0; // Capture index of value into memop | |
76 bool was_store; // Memory op is a store op | |
77 | |
78 // Get the successor block for if the test ptr is non-null | |
79 Block* not_null_block; // this one goes with the proj | |
80 Block* null_block; | |
81 if (_nodes[_nodes.size()-1] == proj) { | |
82 null_block = _succs[0]; | |
83 not_null_block = _succs[1]; | |
84 } else { | |
85 assert(_nodes[_nodes.size()-2] == proj, "proj is one or the other"); | |
86 not_null_block = _succs[0]; | |
87 null_block = _succs[1]; | |
88 } | |
332 | 89 while (null_block->is_Empty() == Block::empty_with_goto) { |
90 null_block = null_block->_succs[0]; | |
91 } | |
0 | 92 |
93 // Search the exception block for an uncommon trap. | |
94 // (See Parse::do_if and Parse::do_ifnull for the reason | |
95 // we need an uncommon trap. Briefly, we need a way to | |
96 // detect failure of this optimization, as in 6366351.) | |
97 { | |
98 bool found_trap = false; | |
99 for (uint i1 = 0; i1 < null_block->_nodes.size(); i1++) { | |
100 Node* nn = null_block->_nodes[i1]; | |
101 if (nn->is_MachCall() && | |
1748 | 102 nn->as_MachCall()->entry_point() == SharedRuntime::uncommon_trap_blob()->entry_point()) { |
0 | 103 const Type* trtype = nn->in(TypeFunc::Parms)->bottom_type(); |
104 if (trtype->isa_int() && trtype->is_int()->is_con()) { | |
105 jint tr_con = trtype->is_int()->get_con(); | |
106 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con); | |
107 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con); | |
108 assert((int)reason < (int)BitsPerInt, "recode bit map"); | |
109 if (is_set_nth_bit(allowed_reasons, (int) reason) | |
110 && action != Deoptimization::Action_none) { | |
111 // This uncommon trap is sure to recompile, eventually. | |
112 // When that happens, C->too_many_traps will prevent | |
113 // this transformation from happening again. | |
114 found_trap = true; | |
115 } | |
116 } | |
117 break; | |
118 } | |
119 } | |
120 if (!found_trap) { | |
121 // We did not find an uncommon trap. | |
122 return; | |
123 } | |
124 } | |
125 | |
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126 // Check for decodeHeapOop_not_null node which did not fold into address |
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127 bool is_decoden = ((intptr_t)val) & 1; |
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128 val = (Node*)(((intptr_t)val) & ~1); |
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129 |
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130 assert(!is_decoden || (val->in(0) == NULL) && val->is_Mach() && |
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131 (val->as_Mach()->ideal_Opcode() == Op_DecodeN), "sanity"); |
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132 |
0 | 133 // Search the successor block for a load or store who's base value is also |
134 // the tested value. There may be several. | |
135 Node_List *out = new Node_List(Thread::current()->resource_area()); | |
136 MachNode *best = NULL; // Best found so far | |
137 for (DUIterator i = val->outs(); val->has_out(i); i++) { | |
138 Node *m = val->out(i); | |
139 if( !m->is_Mach() ) continue; | |
140 MachNode *mach = m->as_Mach(); | |
141 was_store = false; | |
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142 int iop = mach->ideal_Opcode(); |
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143 switch( iop ) { |
0 | 144 case Op_LoadB: |
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145 case Op_LoadUB: |
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146 case Op_LoadUS: |
0 | 147 case Op_LoadD: |
148 case Op_LoadF: | |
149 case Op_LoadI: | |
150 case Op_LoadL: | |
151 case Op_LoadP: | |
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152 case Op_LoadN: |
0 | 153 case Op_LoadS: |
154 case Op_LoadKlass: | |
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155 case Op_LoadNKlass: |
0 | 156 case Op_LoadRange: |
157 case Op_LoadD_unaligned: | |
158 case Op_LoadL_unaligned: | |
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159 assert(mach->in(2) == val, "should be address"); |
0 | 160 break; |
161 case Op_StoreB: | |
162 case Op_StoreC: | |
163 case Op_StoreCM: | |
164 case Op_StoreD: | |
165 case Op_StoreF: | |
166 case Op_StoreI: | |
167 case Op_StoreL: | |
168 case Op_StoreP: | |
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169 case Op_StoreN: |
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170 case Op_StoreNKlass: |
0 | 171 was_store = true; // Memory op is a store op |
172 // Stores will have their address in slot 2 (memory in slot 1). | |
173 // If the value being nul-checked is in another slot, it means we | |
174 // are storing the checked value, which does NOT check the value! | |
175 if( mach->in(2) != val ) continue; | |
176 break; // Found a memory op? | |
177 case Op_StrComp: | |
681 | 178 case Op_StrEquals: |
179 case Op_StrIndexOf: | |
169
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180 case Op_AryEq: |
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181 case Op_EncodeISOArray: |
0 | 182 // Not a legit memory op for implicit null check regardless of |
183 // embedded loads | |
184 continue; | |
185 default: // Also check for embedded loads | |
186 if( !mach->needs_anti_dependence_check() ) | |
187 continue; // Not an memory op; skip it | |
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188 if( must_clone[iop] ) { |
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189 // Do not move nodes which produce flags because |
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190 // RA will try to clone it to place near branch and |
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191 // it will cause recompilation, see clone_node(). |
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192 continue; |
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193 } |
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194 { |
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195 // Check that value is used in memory address in |
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196 // instructions with embedded load (CmpP val1,(val2+off)). |
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197 Node* base; |
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198 Node* index; |
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199 const MachOper* oper = mach->memory_inputs(base, index); |
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200 if (oper == NULL || oper == (MachOper*)-1) { |
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201 continue; // Not an memory op; skip it |
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202 } |
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203 if (val == base || |
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204 val == index && val->bottom_type()->isa_narrowoop()) { |
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205 break; // Found it |
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206 } else { |
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207 continue; // Skip it |
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208 } |
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209 } |
0 | 210 break; |
211 } | |
212 // check if the offset is not too high for implicit exception | |
213 { | |
214 intptr_t offset = 0; | |
215 const TypePtr *adr_type = NULL; // Do not need this return value here | |
216 const Node* base = mach->get_base_and_disp(offset, adr_type); | |
217 if (base == NULL || base == NodeSentinel) { | |
332 | 218 // Narrow oop address doesn't have base, only index |
219 if( val->bottom_type()->isa_narrowoop() && | |
220 MacroAssembler::needs_explicit_null_check(offset) ) | |
221 continue; // Give up if offset is beyond page size | |
0 | 222 // cannot reason about it; is probably not implicit null exception |
223 } else { | |
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224 const TypePtr* tptr; |
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225 if (UseCompressedOops && (Universe::narrow_oop_shift() == 0 || |
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226 Universe::narrow_klass_shift() == 0)) { |
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227 // 32-bits narrow oop can be the base of address expressions |
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228 tptr = base->get_ptr_type(); |
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229 } else { |
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230 // only regular oops are expected here |
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231 tptr = base->bottom_type()->is_ptr(); |
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232 } |
0 | 233 // Give up if offset is not a compile-time constant |
234 if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot ) | |
235 continue; | |
236 offset += tptr->_offset; // correct if base is offseted | |
237 if( MacroAssembler::needs_explicit_null_check(offset) ) | |
238 continue; // Give up is reference is beyond 4K page size | |
239 } | |
240 } | |
241 | |
242 // Check ctrl input to see if the null-check dominates the memory op | |
243 Block *cb = cfg->_bbs[mach->_idx]; | |
244 cb = cb->_idom; // Always hoist at least 1 block | |
245 if( !was_store ) { // Stores can be hoisted only one block | |
246 while( cb->_dom_depth > (_dom_depth + 1)) | |
247 cb = cb->_idom; // Hoist loads as far as we want | |
248 // The non-null-block should dominate the memory op, too. Live | |
249 // range spilling will insert a spill in the non-null-block if it is | |
250 // needs to spill the memory op for an implicit null check. | |
251 if (cb->_dom_depth == (_dom_depth + 1)) { | |
252 if (cb != not_null_block) continue; | |
253 cb = cb->_idom; | |
254 } | |
255 } | |
256 if( cb != this ) continue; | |
257 | |
258 // Found a memory user; see if it can be hoisted to check-block | |
259 uint vidx = 0; // Capture index of value into memop | |
260 uint j; | |
261 for( j = mach->req()-1; j > 0; j-- ) { | |
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262 if( mach->in(j) == val ) { |
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263 vidx = j; |
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264 // Ignore DecodeN val which could be hoisted to where needed. |
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265 if( is_decoden ) continue; |
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266 } |
0 | 267 // Block of memory-op input |
268 Block *inb = cfg->_bbs[mach->in(j)->_idx]; | |
269 Block *b = this; // Start from nul check | |
270 while( b != inb && b->_dom_depth > inb->_dom_depth ) | |
271 b = b->_idom; // search upwards for input | |
272 // See if input dominates null check | |
273 if( b != inb ) | |
274 break; | |
275 } | |
276 if( j > 0 ) | |
277 continue; | |
278 Block *mb = cfg->_bbs[mach->_idx]; | |
279 // Hoisting stores requires more checks for the anti-dependence case. | |
280 // Give up hoisting if we have to move the store past any load. | |
281 if( was_store ) { | |
282 Block *b = mb; // Start searching here for a local load | |
283 // mach use (faulting) trying to hoist | |
284 // n might be blocker to hoisting | |
285 while( b != this ) { | |
286 uint k; | |
287 for( k = 1; k < b->_nodes.size(); k++ ) { | |
288 Node *n = b->_nodes[k]; | |
289 if( n->needs_anti_dependence_check() && | |
290 n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) ) | |
291 break; // Found anti-dependent load | |
292 } | |
293 if( k < b->_nodes.size() ) | |
294 break; // Found anti-dependent load | |
295 // Make sure control does not do a merge (would have to check allpaths) | |
296 if( b->num_preds() != 2 ) break; | |
297 b = cfg->_bbs[b->pred(1)->_idx]; // Move up to predecessor block | |
298 } | |
299 if( b != this ) continue; | |
300 } | |
301 | |
302 // Make sure this memory op is not already being used for a NullCheck | |
303 Node *e = mb->end(); | |
304 if( e->is_MachNullCheck() && e->in(1) == mach ) | |
305 continue; // Already being used as a NULL check | |
306 | |
307 // Found a candidate! Pick one with least dom depth - the highest | |
308 // in the dom tree should be closest to the null check. | |
309 if( !best || | |
310 cfg->_bbs[mach->_idx]->_dom_depth < cfg->_bbs[best->_idx]->_dom_depth ) { | |
311 best = mach; | |
312 bidx = vidx; | |
313 | |
314 } | |
315 } | |
316 // No candidate! | |
317 if( !best ) return; | |
318 | |
319 // ---- Found an implicit null check | |
320 extern int implicit_null_checks; | |
321 implicit_null_checks++; | |
322 | |
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323 if( is_decoden ) { |
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324 // Check if we need to hoist decodeHeapOop_not_null first. |
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325 Block *valb = cfg->_bbs[val->_idx]; |
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326 if( this != valb && this->_dom_depth < valb->_dom_depth ) { |
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327 // Hoist it up to the end of the test block. |
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328 valb->find_remove(val); |
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329 this->add_inst(val); |
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330 cfg->_bbs.map(val->_idx,this); |
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331 // DecodeN on x86 may kill flags. Check for flag-killing projections |
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332 // that also need to be hoisted. |
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333 for (DUIterator_Fast jmax, j = val->fast_outs(jmax); j < jmax; j++) { |
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334 Node* n = val->fast_out(j); |
3842 | 335 if( n->is_MachProj() ) { |
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336 cfg->_bbs[n->_idx]->find_remove(n); |
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337 this->add_inst(n); |
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338 cfg->_bbs.map(n->_idx,this); |
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339 } |
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340 } |
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341 } |
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342 } |
0 | 343 // Hoist the memory candidate up to the end of the test block. |
344 Block *old_block = cfg->_bbs[best->_idx]; | |
345 old_block->find_remove(best); | |
346 add_inst(best); | |
347 cfg->_bbs.map(best->_idx,this); | |
348 | |
349 // Move the control dependence | |
350 if (best->in(0) && best->in(0) == old_block->_nodes[0]) | |
351 best->set_req(0, _nodes[0]); | |
352 | |
353 // Check for flag-killing projections that also need to be hoisted | |
354 // Should be DU safe because no edge updates. | |
355 for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) { | |
356 Node* n = best->fast_out(j); | |
3842 | 357 if( n->is_MachProj() ) { |
0 | 358 cfg->_bbs[n->_idx]->find_remove(n); |
359 add_inst(n); | |
360 cfg->_bbs.map(n->_idx,this); | |
361 } | |
362 } | |
363 | |
364 Compile *C = cfg->C; | |
365 // proj==Op_True --> ne test; proj==Op_False --> eq test. | |
366 // One of two graph shapes got matched: | |
367 // (IfTrue (If (Bool NE (CmpP ptr NULL)))) | |
368 // (IfFalse (If (Bool EQ (CmpP ptr NULL)))) | |
369 // NULL checks are always branch-if-eq. If we see a IfTrue projection | |
370 // then we are replacing a 'ne' test with a 'eq' NULL check test. | |
371 // We need to flip the projections to keep the same semantics. | |
372 if( proj->Opcode() == Op_IfTrue ) { | |
373 // Swap order of projections in basic block to swap branch targets | |
374 Node *tmp1 = _nodes[end_idx()+1]; | |
375 Node *tmp2 = _nodes[end_idx()+2]; | |
376 _nodes.map(end_idx()+1, tmp2); | |
377 _nodes.map(end_idx()+2, tmp1); | |
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378 Node *tmp = new (C) Node(C->top()); // Use not NULL input |
0 | 379 tmp1->replace_by(tmp); |
380 tmp2->replace_by(tmp1); | |
381 tmp->replace_by(tmp2); | |
382 tmp->destruct(); | |
383 } | |
384 | |
385 // Remove the existing null check; use a new implicit null check instead. | |
386 // Since schedule-local needs precise def-use info, we need to correct | |
387 // it as well. | |
388 Node *old_tst = proj->in(0); | |
389 MachNode *nul_chk = new (C) MachNullCheckNode(old_tst->in(0),best,bidx); | |
390 _nodes.map(end_idx(),nul_chk); | |
391 cfg->_bbs.map(nul_chk->_idx,this); | |
392 // Redirect users of old_test to nul_chk | |
393 for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2) | |
394 old_tst->last_out(i2)->set_req(0, nul_chk); | |
395 // Clean-up any dead code | |
396 for (uint i3 = 0; i3 < old_tst->req(); i3++) | |
397 old_tst->set_req(i3, NULL); | |
398 | |
399 cfg->latency_from_uses(nul_chk); | |
400 cfg->latency_from_uses(best); | |
401 } | |
402 | |
403 | |
404 //------------------------------select----------------------------------------- | |
405 // Select a nice fellow from the worklist to schedule next. If there is only | |
406 // one choice, then use it. Projections take top priority for correctness | |
407 // reasons - if I see a projection, then it is next. There are a number of | |
408 // other special cases, for instructions that consume condition codes, et al. | |
409 // These are chosen immediately. Some instructions are required to immediately | |
410 // precede the last instruction in the block, and these are taken last. Of the | |
411 // remaining cases (most), choose the instruction with the greatest latency | |
412 // (that is, the most number of pseudo-cycles required to the end of the | |
413 // routine). If there is a tie, choose the instruction with the most inputs. | |
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414 Node *Block::select(PhaseCFG *cfg, Node_List &worklist, GrowableArray<int> &ready_cnt, VectorSet &next_call, uint sched_slot) { |
0 | 415 |
416 // If only a single entry on the stack, use it | |
417 uint cnt = worklist.size(); | |
418 if (cnt == 1) { | |
419 Node *n = worklist[0]; | |
420 worklist.map(0,worklist.pop()); | |
421 return n; | |
422 } | |
423 | |
424 uint choice = 0; // Bigger is most important | |
425 uint latency = 0; // Bigger is scheduled first | |
426 uint score = 0; // Bigger is better | |
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427 int idx = -1; // Index in worklist |
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428 int cand_cnt = 0; // Candidate count |
0 | 429 |
430 for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist | |
431 // Order in worklist is used to break ties. | |
432 // See caller for how this is used to delay scheduling | |
433 // of induction variable increments to after the other | |
434 // uses of the phi are scheduled. | |
435 Node *n = worklist[i]; // Get Node on worklist | |
436 | |
437 int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0; | |
438 if( n->is_Proj() || // Projections always win | |
439 n->Opcode()== Op_Con || // So does constant 'Top' | |
440 iop == Op_CreateEx || // Create-exception must start block | |
441 iop == Op_CheckCastPP | |
442 ) { | |
443 worklist.map(i,worklist.pop()); | |
444 return n; | |
445 } | |
446 | |
447 // Final call in a block must be adjacent to 'catch' | |
448 Node *e = end(); | |
449 if( e->is_Catch() && e->in(0)->in(0) == n ) | |
450 continue; | |
451 | |
452 // Memory op for an implicit null check has to be at the end of the block | |
453 if( e->is_MachNullCheck() && e->in(1) == n ) | |
454 continue; | |
455 | |
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456 // Schedule IV increment last. |
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457 if (e->is_Mach() && e->as_Mach()->ideal_Opcode() == Op_CountedLoopEnd && |
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458 e->in(1)->in(1) == n && n->is_iteratively_computed()) |
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459 continue; |
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460 |
0 | 461 uint n_choice = 2; |
462 | |
463 // See if this instruction is consumed by a branch. If so, then (as the | |
464 // branch is the last instruction in the basic block) force it to the | |
465 // end of the basic block | |
466 if ( must_clone[iop] ) { | |
467 // See if any use is a branch | |
468 bool found_machif = false; | |
469 | |
470 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
471 Node* use = n->fast_out(j); | |
472 | |
473 // The use is a conditional branch, make them adjacent | |
474 if (use->is_MachIf() && cfg->_bbs[use->_idx]==this ) { | |
475 found_machif = true; | |
476 break; | |
477 } | |
478 | |
479 // More than this instruction pending for successor to be ready, | |
480 // don't choose this if other opportunities are ready | |
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481 if (ready_cnt.at(use->_idx) > 1) |
0 | 482 n_choice = 1; |
483 } | |
484 | |
485 // loop terminated, prefer not to use this instruction | |
486 if (found_machif) | |
487 continue; | |
488 } | |
489 | |
490 // See if this has a predecessor that is "must_clone", i.e. sets the | |
491 // condition code. If so, choose this first | |
492 for (uint j = 0; j < n->req() ; j++) { | |
493 Node *inn = n->in(j); | |
494 if (inn) { | |
495 if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) { | |
496 n_choice = 3; | |
497 break; | |
498 } | |
499 } | |
500 } | |
501 | |
502 // MachTemps should be scheduled last so they are near their uses | |
503 if (n->is_MachTemp()) { | |
504 n_choice = 1; | |
505 } | |
506 | |
1685 | 507 uint n_latency = cfg->_node_latency->at_grow(n->_idx); |
0 | 508 uint n_score = n->req(); // Many inputs get high score to break ties |
509 | |
510 // Keep best latency found | |
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511 cand_cnt++; |
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512 if (choice < n_choice || |
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513 (choice == n_choice && |
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514 ((StressLCM && Compile::randomized_select(cand_cnt)) || |
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515 (!StressLCM && |
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516 (latency < n_latency || |
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517 (latency == n_latency && |
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518 (score < n_score))))))) { |
0 | 519 choice = n_choice; |
520 latency = n_latency; | |
521 score = n_score; | |
522 idx = i; // Also keep index in worklist | |
523 } | |
524 } // End of for all ready nodes in worklist | |
525 | |
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526 assert(idx >= 0, "index should be set"); |
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527 Node *n = worklist[(uint)idx]; // Get the winner |
0 | 528 |
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529 worklist.map((uint)idx, worklist.pop()); // Compress worklist |
0 | 530 return n; |
531 } | |
532 | |
533 | |
534 //------------------------------set_next_call---------------------------------- | |
535 void Block::set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ) { | |
536 if( next_call.test_set(n->_idx) ) return; | |
537 for( uint i=0; i<n->len(); i++ ) { | |
538 Node *m = n->in(i); | |
539 if( !m ) continue; // must see all nodes in block that precede call | |
540 if( bbs[m->_idx] == this ) | |
541 set_next_call( m, next_call, bbs ); | |
542 } | |
543 } | |
544 | |
545 //------------------------------needed_for_next_call--------------------------- | |
546 // Set the flag 'next_call' for each Node that is needed for the next call to | |
547 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
548 // next subroutine call get priority - basically it moves things NOT needed | |
549 // for the next call till after the call. This prevents me from trying to | |
550 // carry lots of stuff live across a call. | |
551 void Block::needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs) { | |
552 // Find the next control-defining Node in this block | |
553 Node* call = NULL; | |
554 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
555 Node* m = this_call->fast_out(i); | |
556 if( bbs[m->_idx] == this && // Local-block user | |
557 m != this_call && // Not self-start node | |
3842 | 558 m->is_MachCall() ) |
0 | 559 call = m; |
560 break; | |
561 } | |
562 if (call == NULL) return; // No next call (e.g., block end is near) | |
563 // Set next-call for all inputs to this call | |
564 set_next_call(call, next_call, bbs); | |
565 } | |
566 | |
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567 //------------------------------add_call_kills------------------------------------- |
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568 void Block::add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe) { |
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569 // Fill in the kill mask for the call |
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570 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { |
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571 if( !regs.Member(r) ) { // Not already defined by the call |
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572 // Save-on-call register? |
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573 if ((save_policy[r] == 'C') || |
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574 (save_policy[r] == 'A') || |
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575 ((save_policy[r] == 'E') && exclude_soe)) { |
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576 proj->_rout.Insert(r); |
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577 } |
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578 } |
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579 } |
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580 } |
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581 |
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582 |
0 | 583 //------------------------------sched_call------------------------------------- |
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584 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 | 585 RegMask regs; |
586 | |
587 // Schedule all the users of the call right now. All the users are | |
588 // projection Nodes, so they must be scheduled next to the call. | |
589 // Collect all the defined registers. | |
590 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
591 Node* n = mcall->fast_out(i); | |
3842 | 592 assert( n->is_MachProj(), "" ); |
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593 int n_cnt = ready_cnt.at(n->_idx)-1; |
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594 ready_cnt.at_put(n->_idx, n_cnt); |
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595 assert( n_cnt == 0, "" ); |
0 | 596 // Schedule next to call |
597 _nodes.map(node_cnt++, n); | |
598 // Collect defined registers | |
599 regs.OR(n->out_RegMask()); | |
600 // Check for scheduling the next control-definer | |
601 if( n->bottom_type() == Type::CONTROL ) | |
602 // Warm up next pile of heuristic bits | |
603 needed_for_next_call(n, next_call, bbs); | |
604 | |
605 // Children of projections are now all ready | |
606 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
607 Node* m = n->fast_out(j); // Get user | |
608 if( bbs[m->_idx] != this ) continue; | |
609 if( m->is_Phi() ) continue; | |
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610 int m_cnt = ready_cnt.at(m->_idx)-1; |
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611 ready_cnt.at_put(m->_idx, m_cnt); |
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612 if( m_cnt == 0 ) |
0 | 613 worklist.push(m); |
614 } | |
615 | |
616 } | |
617 | |
618 // Act as if the call defines the Frame Pointer. | |
619 // Certainly the FP is alive and well after the call. | |
620 regs.Insert(matcher.c_frame_pointer()); | |
621 | |
622 // Set all registers killed and not already defined by the call. | |
623 uint r_cnt = mcall->tf()->range()->cnt(); | |
624 int op = mcall->ideal_Opcode(); | |
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625 MachProjNode *proj = new (matcher.C) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); |
0 | 626 bbs.map(proj->_idx,this); |
627 _nodes.insert(node_cnt++, proj); | |
628 | |
629 // Select the right register save policy. | |
630 const char * save_policy; | |
631 switch (op) { | |
632 case Op_CallRuntime: | |
633 case Op_CallLeaf: | |
634 case Op_CallLeafNoFP: | |
635 // Calling C code so use C calling convention | |
636 save_policy = matcher._c_reg_save_policy; | |
637 break; | |
638 | |
639 case Op_CallStaticJava: | |
640 case Op_CallDynamicJava: | |
641 // Calling Java code so use Java calling convention | |
642 save_policy = matcher._register_save_policy; | |
643 break; | |
644 | |
645 default: | |
646 ShouldNotReachHere(); | |
647 } | |
648 | |
649 // When using CallRuntime mark SOE registers as killed by the call | |
650 // so values that could show up in the RegisterMap aren't live in a | |
651 // callee saved register since the register wouldn't know where to | |
652 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
653 // have debug info on them. Strictly speaking this only needs to be | |
654 // done for oops since idealreg2debugmask takes care of debug info | |
655 // references but there no way to handle oops differently than other | |
656 // pointers as far as the kill mask goes. | |
657 bool exclude_soe = op == Op_CallRuntime; | |
658 | |
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659 // If the call is a MethodHandle invoke, we need to exclude the |
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660 // register which is used to save the SP value over MH invokes from |
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661 // the mask. Otherwise this register could be used for |
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662 // deoptimization information. |
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663 if (op == Op_CallStaticJava) { |
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664 MachCallStaticJavaNode* mcallstaticjava = (MachCallStaticJavaNode*) mcall; |
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665 if (mcallstaticjava->_method_handle_invoke) |
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666 proj->_rout.OR(Matcher::method_handle_invoke_SP_save_mask()); |
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667 } |
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668 |
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669 add_call_kills(proj, regs, save_policy, exclude_soe); |
0 | 670 |
671 return node_cnt; | |
672 } | |
673 | |
674 | |
675 //------------------------------schedule_local--------------------------------- | |
676 // Topological sort within a block. Someday become a real scheduler. | |
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677 bool Block::schedule_local(PhaseCFG *cfg, Matcher &matcher, GrowableArray<int> &ready_cnt, VectorSet &next_call) { |
0 | 678 // Already "sorted" are the block start Node (as the first entry), and |
679 // the block-ending Node and any trailing control projections. We leave | |
680 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
681 // Node. Everything else gets topo-sorted. | |
682 | |
683 #ifndef PRODUCT | |
684 if (cfg->trace_opto_pipelining()) { | |
685 tty->print_cr("# --- schedule_local B%d, before: ---", _pre_order); | |
686 for (uint i = 0;i < _nodes.size();i++) { | |
687 tty->print("# "); | |
688 _nodes[i]->fast_dump(); | |
689 } | |
690 tty->print_cr("#"); | |
691 } | |
692 #endif | |
693 | |
694 // RootNode is already sorted | |
695 if( _nodes.size() == 1 ) return true; | |
696 | |
697 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
698 uint node_cnt = end_idx(); | |
699 uint phi_cnt = 1; | |
700 uint i; | |
701 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
702 Node *n = _nodes[i]; | |
703 if( n->is_Phi() || // Found a PhiNode or ParmNode | |
704 (n->is_Proj() && n->in(0) == head()) ) { | |
705 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt | |
706 _nodes.map(i,_nodes[phi_cnt]); | |
707 _nodes.map(phi_cnt++,n); // swap Phi/Parm up front | |
708 } else { // All others | |
709 // Count block-local inputs to 'n' | |
710 uint cnt = n->len(); // Input count | |
711 uint local = 0; | |
712 for( uint j=0; j<cnt; j++ ) { | |
713 Node *m = n->in(j); | |
714 if( m && cfg->_bbs[m->_idx] == this && !m->is_top() ) | |
715 local++; // One more block-local input | |
716 } | |
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717 ready_cnt.at_put(n->_idx, local); // Count em up |
0 | 718 |
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719 #ifdef ASSERT |
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720 if( UseConcMarkSweepGC || UseG1GC ) { |
0 | 721 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) { |
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722 // Check the precedence edges |
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723 for (uint prec = n->req(); prec < n->len(); prec++) { |
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724 Node* oop_store = n->in(prec); |
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725 if (oop_store != NULL) { |
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726 assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark"); |
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727 } |
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728 } |
0 | 729 } |
730 } | |
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731 #endif |
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732 |
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733 // A few node types require changing a required edge to a precedence edge |
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734 // before allocation. |
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735 if( n->is_Mach() && n->req() > TypeFunc::Parms && |
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736 (n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire || |
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737 n->as_Mach()->ideal_Opcode() == Op_MemBarVolatile) ) { |
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738 // MemBarAcquire could be created without Precedent edge. |
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739 // del_req() replaces the specified edge with the last input edge |
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740 // and then removes the last edge. If the specified edge > number of |
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741 // edges the last edge will be moved outside of the input edges array |
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742 // and the edge will be lost. This is why this code should be |
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743 // executed only when Precedent (== TypeFunc::Parms) edge is present. |
0 | 744 Node *x = n->in(TypeFunc::Parms); |
745 n->del_req(TypeFunc::Parms); | |
746 n->add_prec(x); | |
747 } | |
748 } | |
749 } | |
750 for(uint i2=i; i2<_nodes.size(); i2++ ) // Trailing guys get zapped count | |
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751 ready_cnt.at_put(_nodes[i2]->_idx, 0); |
0 | 752 |
753 // All the prescheduled guys do not hold back internal nodes | |
754 uint i3; | |
755 for(i3 = 0; i3<phi_cnt; i3++ ) { // For all pre-scheduled | |
756 Node *n = _nodes[i3]; // Get pre-scheduled | |
757 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
758 Node* m = n->fast_out(j); | |
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759 if( cfg->_bbs[m->_idx] ==this ) { // Local-block user |
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760 int m_cnt = ready_cnt.at(m->_idx)-1; |
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761 ready_cnt.at_put(m->_idx, m_cnt); // Fix ready count |
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762 } |
0 | 763 } |
764 } | |
765 | |
766 Node_List delay; | |
767 // Make a worklist | |
768 Node_List worklist; | |
769 for(uint i4=i3; i4<node_cnt; i4++ ) { // Put ready guys on worklist | |
770 Node *m = _nodes[i4]; | |
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771 if( !ready_cnt.at(m->_idx) ) { // Zero ready count? |
0 | 772 if (m->is_iteratively_computed()) { |
773 // Push induction variable increments last to allow other uses | |
774 // of the phi to be scheduled first. The select() method breaks | |
775 // ties in scheduling by worklist order. | |
776 delay.push(m); | |
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777 } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) { |
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778 // Force the CreateEx to the top of the list so it's processed |
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779 // first and ends up at the start of the block. |
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780 worklist.insert(0, m); |
0 | 781 } else { |
782 worklist.push(m); // Then on to worklist! | |
783 } | |
784 } | |
785 } | |
786 while (delay.size()) { | |
787 Node* d = delay.pop(); | |
788 worklist.push(d); | |
789 } | |
790 | |
791 // Warm up the 'next_call' heuristic bits | |
792 needed_for_next_call(_nodes[0], next_call, cfg->_bbs); | |
793 | |
794 #ifndef PRODUCT | |
795 if (cfg->trace_opto_pipelining()) { | |
796 for (uint j=0; j<_nodes.size(); j++) { | |
797 Node *n = _nodes[j]; | |
798 int idx = n->_idx; | |
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799 tty->print("# ready cnt:%3d ", ready_cnt.at(idx)); |
1685 | 800 tty->print("latency:%3d ", cfg->_node_latency->at_grow(idx)); |
0 | 801 tty->print("%4d: %s\n", idx, n->Name()); |
802 } | |
803 } | |
804 #endif | |
805 | |
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806 uint max_idx = (uint)ready_cnt.length(); |
0 | 807 // Pull from worklist and schedule |
808 while( worklist.size() ) { // Worklist is not ready | |
809 | |
810 #ifndef PRODUCT | |
811 if (cfg->trace_opto_pipelining()) { | |
812 tty->print("# ready list:"); | |
813 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
814 Node *n = worklist[i]; // Get Node on worklist | |
815 tty->print(" %d", n->_idx); | |
816 } | |
817 tty->cr(); | |
818 } | |
819 #endif | |
820 | |
821 // Select and pop a ready guy from worklist | |
822 Node* n = select(cfg, worklist, ready_cnt, next_call, phi_cnt); | |
823 _nodes.map(phi_cnt++,n); // Schedule him next | |
824 | |
825 #ifndef PRODUCT | |
826 if (cfg->trace_opto_pipelining()) { | |
827 tty->print("# select %d: %s", n->_idx, n->Name()); | |
1685 | 828 tty->print(", latency:%d", cfg->_node_latency->at_grow(n->_idx)); |
0 | 829 n->dump(); |
830 if (Verbose) { | |
831 tty->print("# ready list:"); | |
832 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
833 Node *n = worklist[i]; // Get Node on worklist | |
834 tty->print(" %d", n->_idx); | |
835 } | |
836 tty->cr(); | |
837 } | |
838 } | |
839 | |
840 #endif | |
841 if( n->is_MachCall() ) { | |
842 MachCallNode *mcall = n->as_MachCall(); | |
843 phi_cnt = sched_call(matcher, cfg->_bbs, phi_cnt, worklist, ready_cnt, mcall, next_call); | |
844 continue; | |
845 } | |
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846 |
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847 if (n->is_Mach() && n->as_Mach()->has_call()) { |
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848 RegMask regs; |
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849 regs.Insert(matcher.c_frame_pointer()); |
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850 regs.OR(n->out_RegMask()); |
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851 |
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852 MachProjNode *proj = new (matcher.C) MachProjNode( n, 1, RegMask::Empty, MachProjNode::fat_proj ); |
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853 cfg->_bbs.map(proj->_idx,this); |
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854 _nodes.insert(phi_cnt++, proj); |
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855 |
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856 add_call_kills(proj, regs, matcher._c_reg_save_policy, false); |
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857 } |
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858 |
0 | 859 // Children are now all ready |
860 for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) { | |
861 Node* m = n->fast_out(i5); // Get user | |
862 if( cfg->_bbs[m->_idx] != this ) continue; | |
863 if( m->is_Phi() ) continue; | |
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864 if (m->_idx >= max_idx) { // new node, skip it |
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865 assert(m->is_MachProj() && n->is_Mach() && n->as_Mach()->has_call(), "unexpected node types"); |
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866 continue; |
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867 } |
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868 int m_cnt = ready_cnt.at(m->_idx)-1; |
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869 ready_cnt.at_put(m->_idx, m_cnt); |
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870 if( m_cnt == 0 ) |
0 | 871 worklist.push(m); |
872 } | |
873 } | |
874 | |
875 if( phi_cnt != end_idx() ) { | |
876 // did not schedule all. Retry, Bailout, or Die | |
877 Compile* C = matcher.C; | |
878 if (C->subsume_loads() == true && !C->failing()) { | |
879 // Retry with subsume_loads == false | |
880 // If this is the first failure, the sentinel string will "stick" | |
881 // to the Compile object, and the C2Compiler will see it and retry. | |
882 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
883 } | |
884 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
885 return false; | |
886 } | |
887 | |
888 #ifndef PRODUCT | |
889 if (cfg->trace_opto_pipelining()) { | |
890 tty->print_cr("#"); | |
891 tty->print_cr("# after schedule_local"); | |
892 for (uint i = 0;i < _nodes.size();i++) { | |
893 tty->print("# "); | |
894 _nodes[i]->fast_dump(); | |
895 } | |
896 tty->cr(); | |
897 } | |
898 #endif | |
899 | |
900 | |
901 return true; | |
902 } | |
903 | |
904 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
905 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
906 for (uint l = 0; l < use->len(); l++) { | |
907 if (use->in(l) == old_def) { | |
908 if (l < use->req()) { | |
909 use->set_req(l, new_def); | |
910 } else { | |
911 use->rm_prec(l); | |
912 use->add_prec(new_def); | |
913 l--; | |
914 } | |
915 } | |
916 } | |
917 } | |
918 | |
919 //------------------------------catch_cleanup_find_cloned_def------------------ | |
920 static Node *catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
921 assert( use_blk != def_blk, "Inter-block cleanup only"); | |
922 | |
923 // The use is some block below the Catch. Find and return the clone of the def | |
924 // that dominates the use. If there is no clone in a dominating block, then | |
925 // create a phi for the def in a dominating block. | |
926 | |
927 // Find which successor block dominates this use. The successor | |
928 // blocks must all be single-entry (from the Catch only; I will have | |
929 // split blocks to make this so), hence they all dominate. | |
930 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
931 use_blk = use_blk->_idom; | |
932 | |
933 // Find the successor | |
934 Node *fixup = NULL; | |
935 | |
936 uint j; | |
937 for( j = 0; j < def_blk->_num_succs; j++ ) | |
938 if( use_blk == def_blk->_succs[j] ) | |
939 break; | |
940 | |
941 if( j == def_blk->_num_succs ) { | |
942 // Block at same level in dom-tree is not a successor. It needs a | |
943 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
944 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
945 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
946 inputs.map(k, catch_cleanup_find_cloned_def(bbs[use_blk->pred(k)->_idx], def, def_blk, bbs, n_clone_idx)); | |
947 } | |
948 | |
949 // Check to see if the use_blk already has an identical phi inserted. | |
950 // If it exists, it will be at the first position since all uses of a | |
951 // def are processed together. | |
952 Node *phi = use_blk->_nodes[1]; | |
953 if( phi->is_Phi() ) { | |
954 fixup = phi; | |
955 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
956 if (phi->in(k) != inputs[k]) { | |
957 // Not a match | |
958 fixup = NULL; | |
959 break; | |
960 } | |
961 } | |
962 } | |
963 | |
964 // If an existing PhiNode was not found, make a new one. | |
965 if (fixup == NULL) { | |
966 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
967 use_blk->_nodes.insert(1, new_phi); | |
968 bbs.map(new_phi->_idx, use_blk); | |
969 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
970 new_phi->set_req(k, inputs[k]); | |
971 } | |
972 fixup = new_phi; | |
973 } | |
974 | |
975 } else { | |
976 // Found the use just below the Catch. Make it use the clone. | |
977 fixup = use_blk->_nodes[n_clone_idx]; | |
978 } | |
979 | |
980 return fixup; | |
981 } | |
982 | |
983 //--------------------------catch_cleanup_intra_block-------------------------- | |
984 // Fix all input edges in use that reference "def". The use is in the same | |
985 // block as the def and both have been cloned in each successor block. | |
986 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
987 | |
988 // Both the use and def have been cloned. For each successor block, | |
989 // get the clone of the use, and make its input the clone of the def | |
990 // found in that block. | |
991 | |
992 uint use_idx = blk->find_node(use); | |
993 uint offset_idx = use_idx - beg; | |
994 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
995 // Get clone in each successor block | |
996 Block *sb = blk->_succs[k]; | |
997 Node *clone = sb->_nodes[offset_idx+1]; | |
998 assert( clone->Opcode() == use->Opcode(), "" ); | |
999 | |
1000 // Make use-clone reference the def-clone | |
1001 catch_cleanup_fix_all_inputs(clone, def, sb->_nodes[n_clone_idx]); | |
1002 } | |
1003 } | |
1004 | |
1005 //------------------------------catch_cleanup_inter_block--------------------- | |
1006 // Fix all input edges in use that reference "def". The use is in a different | |
1007 // block than the def. | |
1008 static void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
1009 if( !use_blk ) return; // Can happen if the use is a precedence edge | |
1010 | |
1011 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, bbs, n_clone_idx); | |
1012 catch_cleanup_fix_all_inputs(use, def, new_def); | |
1013 } | |
1014 | |
1015 //------------------------------call_catch_cleanup----------------------------- | |
1016 // If we inserted any instructions between a Call and his CatchNode, | |
1017 // clone the instructions on all paths below the Catch. | |
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1018 void Block::call_catch_cleanup(Block_Array &bbs, Compile* C) { |
0 | 1019 |
1020 // End of region to clone | |
1021 uint end = end_idx(); | |
1022 if( !_nodes[end]->is_Catch() ) return; | |
1023 // Start of region to clone | |
1024 uint beg = end; | |
3842 | 1025 while(!_nodes[beg-1]->is_MachProj() || |
1026 !_nodes[beg-1]->in(0)->is_MachCall() ) { | |
0 | 1027 beg--; |
1028 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
1029 } | |
1030 // Range of inserted instructions is [beg, end) | |
1031 if( beg == end ) return; | |
1032 | |
1033 // Clone along all Catch output paths. Clone area between the 'beg' and | |
1034 // 'end' indices. | |
1035 for( uint i = 0; i < _num_succs; i++ ) { | |
1036 Block *sb = _succs[i]; | |
1037 // Clone the entire area; ignoring the edge fixup for now. | |
1038 for( uint j = end; j > beg; j-- ) { | |
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1039 // It is safe here to clone a node with anti_dependence |
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1040 // since clones dominate on each path. |
0 | 1041 Node *clone = _nodes[j-1]->clone(); |
1042 sb->_nodes.insert( 1, clone ); | |
1043 bbs.map(clone->_idx,sb); | |
1044 } | |
1045 } | |
1046 | |
1047 | |
1048 // Fixup edges. Check the def-use info per cloned Node | |
1049 for(uint i2 = beg; i2 < end; i2++ ) { | |
1050 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
1051 Node *n = _nodes[i2]; // Node that got cloned | |
1052 // Need DU safe iterator because of edge manipulation in calls. | |
1053 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
1054 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
1055 out->push(n->fast_out(j1)); | |
1056 } | |
1057 uint max = out->size(); | |
1058 for (uint j = 0; j < max; j++) {// For all users | |
1059 Node *use = out->pop(); | |
1060 Block *buse = bbs[use->_idx]; | |
1061 if( use->is_Phi() ) { | |
1062 for( uint k = 1; k < use->req(); k++ ) | |
1063 if( use->in(k) == n ) { | |
1064 Node *fixup = catch_cleanup_find_cloned_def(bbs[buse->pred(k)->_idx], n, this, bbs, n_clone_idx); | |
1065 use->set_req(k, fixup); | |
1066 } | |
1067 } else { | |
1068 if (this == buse) { | |
1069 catch_cleanup_intra_block(use, n, this, beg, n_clone_idx); | |
1070 } else { | |
1071 catch_cleanup_inter_block(use, buse, n, this, bbs, n_clone_idx); | |
1072 } | |
1073 } | |
1074 } // End for all users | |
1075 | |
1076 } // End of for all Nodes in cloned area | |
1077 | |
1078 // Remove the now-dead cloned ops | |
1079 for(uint i3 = beg; i3 < end; i3++ ) { | |
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1080 _nodes[beg]->disconnect_inputs(NULL, C); |
0 | 1081 _nodes.remove(beg); |
1082 } | |
1083 | |
1084 // If the successor blocks have a CreateEx node, move it back to the top | |
1085 for(uint i4 = 0; i4 < _num_succs; i4++ ) { | |
1086 Block *sb = _succs[i4]; | |
1087 uint new_cnt = end - beg; | |
1088 // Remove any newly created, but dead, nodes. | |
1089 for( uint j = new_cnt; j > 0; j-- ) { | |
1090 Node *n = sb->_nodes[j]; | |
1091 if (n->outcnt() == 0 && | |
1092 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
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1093 n->disconnect_inputs(NULL, C); |
0 | 1094 sb->_nodes.remove(j); |
1095 new_cnt--; | |
1096 } | |
1097 } | |
1098 // If any newly created nodes remain, move the CreateEx node to the top | |
1099 if (new_cnt > 0) { | |
1100 Node *cex = sb->_nodes[1+new_cnt]; | |
1101 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { | |
1102 sb->_nodes.remove(1+new_cnt); | |
1103 sb->_nodes.insert(1,cex); | |
1104 } | |
1105 } | |
1106 } | |
1107 } |