Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/lcm.cpp @ 12242:884ed7a10f09
Merge
author | tschatzl |
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date | Mon, 16 Sep 2013 09:41:03 +0200 |
parents | a9a968364704 |
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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. |
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61 void PhaseCFG::implicit_null_check(Block* block, Node *proj, Node *val, int allowed_reasons) { |
0 | 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! | |
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68 float f = block->end()->as_MachIf()->_prob; |
0 | 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; | |
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78 if (block->get_node(block->number_of_nodes()-1) == proj) { |
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79 null_block = block->_succs[0]; |
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80 not_null_block = block->_succs[1]; |
0 | 81 } else { |
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82 assert(block->get_node(block->number_of_nodes()-2) == proj, "proj is one or the other"); |
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83 not_null_block = block->_succs[0]; |
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84 null_block = block->_succs[1]; |
0 | 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; | |
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96 for (uint i1 = 0; i1 < null_block->number_of_nodes(); i1++) { |
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97 Node* nn = null_block->get_node(i1); |
0 | 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 Universe::narrow_klass_shift() == 0)) { |
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224 // 32-bits narrow oop can be the base of address expressions |
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225 tptr = base->get_ptr_type(); |
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226 } else { |
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227 // only regular oops are expected here |
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228 tptr = base->bottom_type()->is_ptr(); |
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229 } |
0 | 230 // Give up if offset is not a compile-time constant |
231 if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot ) | |
232 continue; | |
233 offset += tptr->_offset; // correct if base is offseted | |
234 if( MacroAssembler::needs_explicit_null_check(offset) ) | |
235 continue; // Give up is reference is beyond 4K page size | |
236 } | |
237 } | |
238 | |
239 // Check ctrl input to see if the null-check dominates the memory op | |
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240 Block *cb = get_block_for_node(mach); |
0 | 241 cb = cb->_idom; // Always hoist at least 1 block |
242 if( !was_store ) { // Stores can be hoisted only one block | |
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243 while( cb->_dom_depth > (block->_dom_depth + 1)) |
0 | 244 cb = cb->_idom; // Hoist loads as far as we want |
245 // The non-null-block should dominate the memory op, too. Live | |
246 // range spilling will insert a spill in the non-null-block if it is | |
247 // needs to spill the memory op for an implicit null check. | |
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248 if (cb->_dom_depth == (block->_dom_depth + 1)) { |
0 | 249 if (cb != not_null_block) continue; |
250 cb = cb->_idom; | |
251 } | |
252 } | |
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253 if( cb != block ) continue; |
0 | 254 |
255 // Found a memory user; see if it can be hoisted to check-block | |
256 uint vidx = 0; // Capture index of value into memop | |
257 uint j; | |
258 for( j = mach->req()-1; j > 0; j-- ) { | |
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259 if( mach->in(j) == val ) { |
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260 vidx = j; |
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261 // Ignore DecodeN val which could be hoisted to where needed. |
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262 if( is_decoden ) continue; |
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263 } |
0 | 264 // Block of memory-op input |
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265 Block *inb = get_block_for_node(mach->in(j)); |
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266 Block *b = block; // Start from nul check |
0 | 267 while( b != inb && b->_dom_depth > inb->_dom_depth ) |
268 b = b->_idom; // search upwards for input | |
269 // See if input dominates null check | |
270 if( b != inb ) | |
271 break; | |
272 } | |
273 if( j > 0 ) | |
274 continue; | |
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275 Block *mb = get_block_for_node(mach); |
0 | 276 // Hoisting stores requires more checks for the anti-dependence case. |
277 // Give up hoisting if we have to move the store past any load. | |
278 if( was_store ) { | |
279 Block *b = mb; // Start searching here for a local load | |
280 // mach use (faulting) trying to hoist | |
281 // n might be blocker to hoisting | |
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282 while( b != block ) { |
0 | 283 uint k; |
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284 for( k = 1; k < b->number_of_nodes(); k++ ) { |
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285 Node *n = b->get_node(k); |
0 | 286 if( n->needs_anti_dependence_check() && |
287 n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) ) | |
288 break; // Found anti-dependent load | |
289 } | |
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290 if( k < b->number_of_nodes() ) |
0 | 291 break; // Found anti-dependent load |
292 // Make sure control does not do a merge (would have to check allpaths) | |
293 if( b->num_preds() != 2 ) break; | |
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294 b = get_block_for_node(b->pred(1)); // Move up to predecessor block |
0 | 295 } |
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296 if( b != block ) continue; |
0 | 297 } |
298 | |
299 // Make sure this memory op is not already being used for a NullCheck | |
300 Node *e = mb->end(); | |
301 if( e->is_MachNullCheck() && e->in(1) == mach ) | |
302 continue; // Already being used as a NULL check | |
303 | |
304 // Found a candidate! Pick one with least dom depth - the highest | |
305 // in the dom tree should be closest to the null check. | |
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306 if (best == NULL || get_block_for_node(mach)->_dom_depth < get_block_for_node(best)->_dom_depth) { |
0 | 307 best = mach; |
308 bidx = vidx; | |
309 } | |
310 } | |
311 // No candidate! | |
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312 if (best == NULL) { |
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313 return; |
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314 } |
0 | 315 |
316 // ---- Found an implicit null check | |
317 extern int implicit_null_checks; | |
318 implicit_null_checks++; | |
319 | |
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320 if( is_decoden ) { |
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321 // Check if we need to hoist decodeHeapOop_not_null first. |
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322 Block *valb = get_block_for_node(val); |
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323 if( block != valb && block->_dom_depth < valb->_dom_depth ) { |
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324 // Hoist it up to the end of the test block. |
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325 valb->find_remove(val); |
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326 block->add_inst(val); |
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327 map_node_to_block(val, block); |
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328 // DecodeN on x86 may kill flags. Check for flag-killing projections |
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329 // that also need to be hoisted. |
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330 for (DUIterator_Fast jmax, j = val->fast_outs(jmax); j < jmax; j++) { |
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331 Node* n = val->fast_out(j); |
3842 | 332 if( n->is_MachProj() ) { |
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333 get_block_for_node(n)->find_remove(n); |
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334 block->add_inst(n); |
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335 map_node_to_block(n, block); |
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336 } |
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337 } |
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338 } |
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339 } |
0 | 340 // Hoist the memory candidate up to the end of the test block. |
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341 Block *old_block = get_block_for_node(best); |
0 | 342 old_block->find_remove(best); |
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343 block->add_inst(best); |
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344 map_node_to_block(best, block); |
0 | 345 |
346 // Move the control dependence | |
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347 if (best->in(0) && best->in(0) == old_block->head()) |
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348 best->set_req(0, block->head()); |
0 | 349 |
350 // Check for flag-killing projections that also need to be hoisted | |
351 // Should be DU safe because no edge updates. | |
352 for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) { | |
353 Node* n = best->fast_out(j); | |
3842 | 354 if( n->is_MachProj() ) { |
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355 get_block_for_node(n)->find_remove(n); |
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356 block->add_inst(n); |
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357 map_node_to_block(n, block); |
0 | 358 } |
359 } | |
360 | |
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 | |
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370 Node *tmp1 = block->get_node(block->end_idx()+1); |
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371 Node *tmp2 = block->get_node(block->end_idx()+2); |
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372 block->map_node(tmp2, block->end_idx()+1); |
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373 block->map_node(tmp1, block->end_idx()+2); |
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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); | |
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386 block->map_node(nul_chk, block->end_idx()); |
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387 map_node_to_block(nul_chk, block); |
0 | 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 | |
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395 latency_from_uses(nul_chk); |
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396 latency_from_uses(best); |
0 | 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* PhaseCFG::select(Block* block, 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 |
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424 int cand_cnt = 0; // Candidate count |
0 | 425 |
426 for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist | |
427 // Order in worklist is used to break ties. | |
428 // See caller for how this is used to delay scheduling | |
429 // of induction variable increments to after the other | |
430 // uses of the phi are scheduled. | |
431 Node *n = worklist[i]; // Get Node on worklist | |
432 | |
433 int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0; | |
434 if( n->is_Proj() || // Projections always win | |
435 n->Opcode()== Op_Con || // So does constant 'Top' | |
436 iop == Op_CreateEx || // Create-exception must start block | |
437 iop == Op_CheckCastPP | |
438 ) { | |
439 worklist.map(i,worklist.pop()); | |
440 return n; | |
441 } | |
442 | |
443 // Final call in a block must be adjacent to 'catch' | |
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444 Node *e = block->end(); |
0 | 445 if( e->is_Catch() && e->in(0)->in(0) == n ) |
446 continue; | |
447 | |
448 // Memory op for an implicit null check has to be at the end of the block | |
449 if( e->is_MachNullCheck() && e->in(1) == n ) | |
450 continue; | |
451 | |
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452 // Schedule IV increment last. |
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453 if (e->is_Mach() && e->as_Mach()->ideal_Opcode() == Op_CountedLoopEnd && |
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454 e->in(1)->in(1) == n && n->is_iteratively_computed()) |
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455 continue; |
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456 |
0 | 457 uint n_choice = 2; |
458 | |
459 // See if this instruction is consumed by a branch. If so, then (as the | |
460 // branch is the last instruction in the basic block) force it to the | |
461 // end of the basic block | |
462 if ( must_clone[iop] ) { | |
463 // See if any use is a branch | |
464 bool found_machif = false; | |
465 | |
466 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
467 Node* use = n->fast_out(j); | |
468 | |
469 // The use is a conditional branch, make them adjacent | |
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470 if (use->is_MachIf() && get_block_for_node(use) == block) { |
0 | 471 found_machif = true; |
472 break; | |
473 } | |
474 | |
475 // More than this instruction pending for successor to be ready, | |
476 // don't choose this if other opportunities are ready | |
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477 if (ready_cnt.at(use->_idx) > 1) |
0 | 478 n_choice = 1; |
479 } | |
480 | |
481 // loop terminated, prefer not to use this instruction | |
482 if (found_machif) | |
483 continue; | |
484 } | |
485 | |
486 // See if this has a predecessor that is "must_clone", i.e. sets the | |
487 // condition code. If so, choose this first | |
488 for (uint j = 0; j < n->req() ; j++) { | |
489 Node *inn = n->in(j); | |
490 if (inn) { | |
491 if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) { | |
492 n_choice = 3; | |
493 break; | |
494 } | |
495 } | |
496 } | |
497 | |
498 // MachTemps should be scheduled last so they are near their uses | |
499 if (n->is_MachTemp()) { | |
500 n_choice = 1; | |
501 } | |
502 | |
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503 uint n_latency = get_latency_for_node(n); |
0 | 504 uint n_score = n->req(); // Many inputs get high score to break ties |
505 | |
506 // Keep best latency found | |
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507 cand_cnt++; |
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508 if (choice < n_choice || |
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509 (choice == n_choice && |
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510 ((StressLCM && Compile::randomized_select(cand_cnt)) || |
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511 (!StressLCM && |
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512 (latency < n_latency || |
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513 (latency == n_latency && |
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514 (score < n_score))))))) { |
0 | 515 choice = n_choice; |
516 latency = n_latency; | |
517 score = n_score; | |
518 idx = i; // Also keep index in worklist | |
519 } | |
520 } // End of for all ready nodes in worklist | |
521 | |
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522 assert(idx >= 0, "index should be set"); |
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523 Node *n = worklist[(uint)idx]; // Get the winner |
0 | 524 |
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525 worklist.map((uint)idx, worklist.pop()); // Compress worklist |
0 | 526 return n; |
527 } | |
528 | |
529 | |
530 //------------------------------set_next_call---------------------------------- | |
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531 void PhaseCFG::set_next_call(Block* block, Node* n, VectorSet& next_call) { |
0 | 532 if( next_call.test_set(n->_idx) ) return; |
533 for( uint i=0; i<n->len(); i++ ) { | |
534 Node *m = n->in(i); | |
535 if( !m ) continue; // must see all nodes in block that precede call | |
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536 if (get_block_for_node(m) == block) { |
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537 set_next_call(block, m, next_call); |
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538 } |
0 | 539 } |
540 } | |
541 | |
542 //------------------------------needed_for_next_call--------------------------- | |
543 // Set the flag 'next_call' for each Node that is needed for the next call to | |
544 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
545 // next subroutine call get priority - basically it moves things NOT needed | |
546 // for the next call till after the call. This prevents me from trying to | |
547 // carry lots of stuff live across a call. | |
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548 void PhaseCFG::needed_for_next_call(Block* block, Node* this_call, VectorSet& next_call) { |
0 | 549 // Find the next control-defining Node in this block |
550 Node* call = NULL; | |
551 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
552 Node* m = this_call->fast_out(i); | |
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553 if (get_block_for_node(m) == block && // Local-block user |
0 | 554 m != this_call && // Not self-start node |
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555 m->is_MachCall()) { |
0 | 556 call = m; |
557 break; | |
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558 } |
0 | 559 } |
560 if (call == NULL) return; // No next call (e.g., block end is near) | |
561 // Set next-call for all inputs to this call | |
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562 set_next_call(block, call, next_call); |
0 | 563 } |
564 | |
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565 //------------------------------add_call_kills------------------------------------- |
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566 // helper function that adds caller save registers to MachProjNode |
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567 static void add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe) { |
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568 // Fill in the kill mask for the call |
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569 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { |
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570 if( !regs.Member(r) ) { // Not already defined by the call |
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571 // Save-on-call register? |
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572 if ((save_policy[r] == 'C') || |
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573 (save_policy[r] == 'A') || |
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574 ((save_policy[r] == 'E') && exclude_soe)) { |
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575 proj->_rout.Insert(r); |
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576 } |
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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 |
0 | 582 //------------------------------sched_call------------------------------------- |
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583 uint PhaseCFG::sched_call(Block* block, uint node_cnt, Node_List& worklist, GrowableArray<int>& ready_cnt, MachCallNode* mcall, VectorSet& next_call) { |
0 | 584 RegMask regs; |
585 | |
586 // Schedule all the users of the call right now. All the users are | |
587 // projection Nodes, so they must be scheduled next to the call. | |
588 // Collect all the defined registers. | |
589 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
590 Node* n = mcall->fast_out(i); | |
3842 | 591 assert( n->is_MachProj(), "" ); |
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592 int n_cnt = ready_cnt.at(n->_idx)-1; |
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593 ready_cnt.at_put(n->_idx, n_cnt); |
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594 assert( n_cnt == 0, "" ); |
0 | 595 // Schedule next to call |
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596 block->map_node(n, node_cnt++); |
0 | 597 // Collect defined registers |
598 regs.OR(n->out_RegMask()); | |
599 // Check for scheduling the next control-definer | |
600 if( n->bottom_type() == Type::CONTROL ) | |
601 // Warm up next pile of heuristic bits | |
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602 needed_for_next_call(block, n, next_call); |
0 | 603 |
604 // Children of projections are now all ready | |
605 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
606 Node* m = n->fast_out(j); // Get user | |
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607 if(get_block_for_node(m) != block) { |
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608 continue; |
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609 } |
0 | 610 if( m->is_Phi() ) continue; |
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611 int m_cnt = ready_cnt.at(m->_idx)-1; |
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612 ready_cnt.at_put(m->_idx, m_cnt); |
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613 if( m_cnt == 0 ) |
0 | 614 worklist.push(m); |
615 } | |
616 | |
617 } | |
618 | |
619 // Act as if the call defines the Frame Pointer. | |
620 // Certainly the FP is alive and well after the call. | |
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621 regs.Insert(_matcher.c_frame_pointer()); |
0 | 622 |
623 // Set all registers killed and not already defined by the call. | |
624 uint r_cnt = mcall->tf()->range()->cnt(); | |
625 int op = mcall->ideal_Opcode(); | |
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626 MachProjNode *proj = new (C) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); |
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627 map_node_to_block(proj, block); |
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628 block->insert_node(proj, node_cnt++); |
0 | 629 |
630 // Select the right register save policy. | |
631 const char * save_policy; | |
632 switch (op) { | |
633 case Op_CallRuntime: | |
634 case Op_CallLeaf: | |
635 case Op_CallLeafNoFP: | |
636 // Calling C code so use C calling convention | |
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637 save_policy = _matcher._c_reg_save_policy; |
0 | 638 break; |
639 | |
640 case Op_CallStaticJava: | |
641 case Op_CallDynamicJava: | |
642 // Calling Java code so use Java calling convention | |
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643 save_policy = _matcher._register_save_policy; |
0 | 644 break; |
645 | |
646 default: | |
647 ShouldNotReachHere(); | |
648 } | |
649 | |
650 // When using CallRuntime mark SOE registers as killed by the call | |
651 // so values that could show up in the RegisterMap aren't live in a | |
652 // callee saved register since the register wouldn't know where to | |
653 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
654 // have debug info on them. Strictly speaking this only needs to be | |
655 // done for oops since idealreg2debugmask takes care of debug info | |
656 // references but there no way to handle oops differently than other | |
657 // pointers as far as the kill mask goes. | |
658 bool exclude_soe = op == Op_CallRuntime; | |
659 | |
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660 // If the call is a MethodHandle invoke, we need to exclude the |
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661 // register which is used to save the SP value over MH invokes from |
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662 // the mask. Otherwise this register could be used for |
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663 // deoptimization information. |
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664 if (op == Op_CallStaticJava) { |
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665 MachCallStaticJavaNode* mcallstaticjava = (MachCallStaticJavaNode*) mcall; |
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666 if (mcallstaticjava->_method_handle_invoke) |
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667 proj->_rout.OR(Matcher::method_handle_invoke_SP_save_mask()); |
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668 } |
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669 |
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670 add_call_kills(proj, regs, save_policy, exclude_soe); |
0 | 671 |
672 return node_cnt; | |
673 } | |
674 | |
675 | |
676 //------------------------------schedule_local--------------------------------- | |
677 // Topological sort within a block. Someday become a real scheduler. | |
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678 bool PhaseCFG::schedule_local(Block* block, GrowableArray<int>& ready_cnt, VectorSet& next_call) { |
0 | 679 // Already "sorted" are the block start Node (as the first entry), and |
680 // the block-ending Node and any trailing control projections. We leave | |
681 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
682 // Node. Everything else gets topo-sorted. | |
683 | |
684 #ifndef PRODUCT | |
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685 if (trace_opto_pipelining()) { |
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686 tty->print_cr("# --- schedule_local B%d, before: ---", block->_pre_order); |
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687 for (uint i = 0;i < block->number_of_nodes(); i++) { |
0 | 688 tty->print("# "); |
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689 block->get_node(i)->fast_dump(); |
0 | 690 } |
691 tty->print_cr("#"); | |
692 } | |
693 #endif | |
694 | |
695 // RootNode is already sorted | |
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696 if (block->number_of_nodes() == 1) { |
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697 return true; |
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698 } |
0 | 699 |
700 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
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701 uint node_cnt = block->end_idx(); |
0 | 702 uint phi_cnt = 1; |
703 uint i; | |
704 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
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705 Node *n = block->get_node(i); |
0 | 706 if( n->is_Phi() || // Found a PhiNode or ParmNode |
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707 (n->is_Proj() && n->in(0) == block->head()) ) { |
0 | 708 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt |
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709 block->map_node(block->get_node(phi_cnt), i); |
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710 block->map_node(n, phi_cnt++); // swap Phi/Parm up front |
0 | 711 } else { // All others |
712 // Count block-local inputs to 'n' | |
713 uint cnt = n->len(); // Input count | |
714 uint local = 0; | |
715 for( uint j=0; j<cnt; j++ ) { | |
716 Node *m = n->in(j); | |
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717 if( m && get_block_for_node(m) == block && !m->is_top() ) |
0 | 718 local++; // One more block-local input |
719 } | |
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720 ready_cnt.at_put(n->_idx, local); // Count em up |
0 | 721 |
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722 #ifdef ASSERT |
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723 if( UseConcMarkSweepGC || UseG1GC ) { |
0 | 724 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) { |
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725 // Check the precedence edges |
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726 for (uint prec = n->req(); prec < n->len(); prec++) { |
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727 Node* oop_store = n->in(prec); |
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728 if (oop_store != NULL) { |
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729 assert(get_block_for_node(oop_store)->_dom_depth <= block->_dom_depth, "oop_store must dominate card-mark"); |
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730 } |
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731 } |
0 | 732 } |
733 } | |
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734 #endif |
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735 |
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736 // A few node types require changing a required edge to a precedence edge |
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737 // before allocation. |
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738 if( n->is_Mach() && n->req() > TypeFunc::Parms && |
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739 (n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire || |
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740 n->as_Mach()->ideal_Opcode() == Op_MemBarVolatile) ) { |
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741 // MemBarAcquire could be created without Precedent edge. |
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742 // del_req() replaces the specified edge with the last input edge |
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743 // and then removes the last edge. If the specified edge > number of |
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744 // edges the last edge will be moved outside of the input edges array |
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745 // and the edge will be lost. This is why this code should be |
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746 // executed only when Precedent (== TypeFunc::Parms) edge is present. |
0 | 747 Node *x = n->in(TypeFunc::Parms); |
748 n->del_req(TypeFunc::Parms); | |
749 n->add_prec(x); | |
750 } | |
751 } | |
752 } | |
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753 for(uint i2=i; i2< block->number_of_nodes(); i2++ ) // Trailing guys get zapped count |
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754 ready_cnt.at_put(block->get_node(i2)->_idx, 0); |
0 | 755 |
756 // All the prescheduled guys do not hold back internal nodes | |
757 uint i3; | |
758 for(i3 = 0; i3<phi_cnt; i3++ ) { // For all pre-scheduled | |
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759 Node *n = block->get_node(i3); // Get pre-scheduled |
0 | 760 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
761 Node* m = n->fast_out(j); | |
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762 if (get_block_for_node(m) == block) { // Local-block user |
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763 int m_cnt = ready_cnt.at(m->_idx)-1; |
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764 ready_cnt.at_put(m->_idx, m_cnt); // Fix ready count |
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765 } |
0 | 766 } |
767 } | |
768 | |
769 Node_List delay; | |
770 // Make a worklist | |
771 Node_List worklist; | |
772 for(uint i4=i3; i4<node_cnt; i4++ ) { // Put ready guys on worklist | |
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773 Node *m = block->get_node(i4); |
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774 if( !ready_cnt.at(m->_idx) ) { // Zero ready count? |
0 | 775 if (m->is_iteratively_computed()) { |
776 // Push induction variable increments last to allow other uses | |
777 // of the phi to be scheduled first. The select() method breaks | |
778 // ties in scheduling by worklist order. | |
779 delay.push(m); | |
125
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780 } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) { |
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781 // Force the CreateEx to the top of the list so it's processed |
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782 // first and ends up at the start of the block. |
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783 worklist.insert(0, m); |
0 | 784 } else { |
785 worklist.push(m); // Then on to worklist! | |
786 } | |
787 } | |
788 } | |
789 while (delay.size()) { | |
790 Node* d = delay.pop(); | |
791 worklist.push(d); | |
792 } | |
793 | |
794 // Warm up the 'next_call' heuristic bits | |
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795 needed_for_next_call(block, block->head(), next_call); |
0 | 796 |
797 #ifndef PRODUCT | |
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798 if (trace_opto_pipelining()) { |
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799 for (uint j=0; j< block->number_of_nodes(); j++) { |
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800 Node *n = block->get_node(j); |
0 | 801 int idx = n->_idx; |
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802 tty->print("# ready cnt:%3d ", ready_cnt.at(idx)); |
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803 tty->print("latency:%3d ", get_latency_for_node(n)); |
0 | 804 tty->print("%4d: %s\n", idx, n->Name()); |
805 } | |
806 } | |
807 #endif | |
808 | |
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809 uint max_idx = (uint)ready_cnt.length(); |
0 | 810 // Pull from worklist and schedule |
811 while( worklist.size() ) { // Worklist is not ready | |
812 | |
813 #ifndef PRODUCT | |
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814 if (trace_opto_pipelining()) { |
0 | 815 tty->print("# ready list:"); |
816 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
817 Node *n = worklist[i]; // Get Node on worklist | |
818 tty->print(" %d", n->_idx); | |
819 } | |
820 tty->cr(); | |
821 } | |
822 #endif | |
823 | |
824 // Select and pop a ready guy from worklist | |
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825 Node* n = select(block, worklist, ready_cnt, next_call, phi_cnt); |
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826 block->map_node(n, phi_cnt++); // Schedule him next |
0 | 827 |
828 #ifndef PRODUCT | |
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829 if (trace_opto_pipelining()) { |
0 | 830 tty->print("# select %d: %s", n->_idx, n->Name()); |
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831 tty->print(", latency:%d", get_latency_for_node(n)); |
0 | 832 n->dump(); |
833 if (Verbose) { | |
834 tty->print("# ready list:"); | |
835 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
836 Node *n = worklist[i]; // Get Node on worklist | |
837 tty->print(" %d", n->_idx); | |
838 } | |
839 tty->cr(); | |
840 } | |
841 } | |
842 | |
843 #endif | |
844 if( n->is_MachCall() ) { | |
845 MachCallNode *mcall = n->as_MachCall(); | |
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846 phi_cnt = sched_call(block, phi_cnt, worklist, ready_cnt, mcall, next_call); |
0 | 847 continue; |
848 } | |
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849 |
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850 if (n->is_Mach() && n->as_Mach()->has_call()) { |
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851 RegMask regs; |
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852 regs.Insert(_matcher.c_frame_pointer()); |
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853 regs.OR(n->out_RegMask()); |
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854 |
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855 MachProjNode *proj = new (C) MachProjNode( n, 1, RegMask::Empty, MachProjNode::fat_proj ); |
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856 map_node_to_block(proj, block); |
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857 block->insert_node(proj, phi_cnt++); |
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858 |
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859 add_call_kills(proj, regs, _matcher._c_reg_save_policy, false); |
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860 } |
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861 |
0 | 862 // Children are now all ready |
863 for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) { | |
864 Node* m = n->fast_out(i5); // Get user | |
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865 if (get_block_for_node(m) != block) { |
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866 continue; |
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867 } |
0 | 868 if( m->is_Phi() ) continue; |
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869 if (m->_idx >= max_idx) { // new node, skip it |
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870 assert(m->is_MachProj() && n->is_Mach() && n->as_Mach()->has_call(), "unexpected node types"); |
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871 continue; |
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872 } |
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873 int m_cnt = ready_cnt.at(m->_idx)-1; |
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874 ready_cnt.at_put(m->_idx, m_cnt); |
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875 if( m_cnt == 0 ) |
0 | 876 worklist.push(m); |
877 } | |
878 } | |
879 | |
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880 if( phi_cnt != block->end_idx() ) { |
0 | 881 // did not schedule all. Retry, Bailout, or Die |
882 if (C->subsume_loads() == true && !C->failing()) { | |
883 // Retry with subsume_loads == false | |
884 // If this is the first failure, the sentinel string will "stick" | |
885 // to the Compile object, and the C2Compiler will see it and retry. | |
886 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
887 } | |
888 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
889 return false; | |
890 } | |
891 | |
892 #ifndef PRODUCT | |
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893 if (trace_opto_pipelining()) { |
0 | 894 tty->print_cr("#"); |
895 tty->print_cr("# after schedule_local"); | |
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896 for (uint i = 0;i < block->number_of_nodes();i++) { |
0 | 897 tty->print("# "); |
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898 block->get_node(i)->fast_dump(); |
0 | 899 } |
900 tty->cr(); | |
901 } | |
902 #endif | |
903 | |
904 | |
905 return true; | |
906 } | |
907 | |
908 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
909 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
910 for (uint l = 0; l < use->len(); l++) { | |
911 if (use->in(l) == old_def) { | |
912 if (l < use->req()) { | |
913 use->set_req(l, new_def); | |
914 } else { | |
915 use->rm_prec(l); | |
916 use->add_prec(new_def); | |
917 l--; | |
918 } | |
919 } | |
920 } | |
921 } | |
922 | |
923 //------------------------------catch_cleanup_find_cloned_def------------------ | |
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924 Node* PhaseCFG::catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, int n_clone_idx) { |
0 | 925 assert( use_blk != def_blk, "Inter-block cleanup only"); |
926 | |
927 // The use is some block below the Catch. Find and return the clone of the def | |
928 // that dominates the use. If there is no clone in a dominating block, then | |
929 // create a phi for the def in a dominating block. | |
930 | |
931 // Find which successor block dominates this use. The successor | |
932 // blocks must all be single-entry (from the Catch only; I will have | |
933 // split blocks to make this so), hence they all dominate. | |
934 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
935 use_blk = use_blk->_idom; | |
936 | |
937 // Find the successor | |
938 Node *fixup = NULL; | |
939 | |
940 uint j; | |
941 for( j = 0; j < def_blk->_num_succs; j++ ) | |
942 if( use_blk == def_blk->_succs[j] ) | |
943 break; | |
944 | |
945 if( j == def_blk->_num_succs ) { | |
946 // Block at same level in dom-tree is not a successor. It needs a | |
947 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
948 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
949 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
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950 Block* block = get_block_for_node(use_blk->pred(k)); |
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951 inputs.map(k, catch_cleanup_find_cloned_def(block, def, def_blk, n_clone_idx)); |
0 | 952 } |
953 | |
954 // Check to see if the use_blk already has an identical phi inserted. | |
955 // If it exists, it will be at the first position since all uses of a | |
956 // def are processed together. | |
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957 Node *phi = use_blk->get_node(1); |
0 | 958 if( phi->is_Phi() ) { |
959 fixup = phi; | |
960 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
961 if (phi->in(k) != inputs[k]) { | |
962 // Not a match | |
963 fixup = NULL; | |
964 break; | |
965 } | |
966 } | |
967 } | |
968 | |
969 // If an existing PhiNode was not found, make a new one. | |
970 if (fixup == NULL) { | |
971 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
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972 use_blk->insert_node(new_phi, 1); |
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973 map_node_to_block(new_phi, use_blk); |
0 | 974 for (uint k = 1; k < use_blk->num_preds(); k++) { |
975 new_phi->set_req(k, inputs[k]); | |
976 } | |
977 fixup = new_phi; | |
978 } | |
979 | |
980 } else { | |
981 // Found the use just below the Catch. Make it use the clone. | |
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982 fixup = use_blk->get_node(n_clone_idx); |
0 | 983 } |
984 | |
985 return fixup; | |
986 } | |
987 | |
988 //--------------------------catch_cleanup_intra_block-------------------------- | |
989 // Fix all input edges in use that reference "def". The use is in the same | |
990 // block as the def and both have been cloned in each successor block. | |
991 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
992 | |
993 // Both the use and def have been cloned. For each successor block, | |
994 // get the clone of the use, and make its input the clone of the def | |
995 // found in that block. | |
996 | |
997 uint use_idx = blk->find_node(use); | |
998 uint offset_idx = use_idx - beg; | |
999 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
1000 // Get clone in each successor block | |
1001 Block *sb = blk->_succs[k]; | |
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1002 Node *clone = sb->get_node(offset_idx+1); |
0 | 1003 assert( clone->Opcode() == use->Opcode(), "" ); |
1004 | |
1005 // Make use-clone reference the def-clone | |
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1006 catch_cleanup_fix_all_inputs(clone, def, sb->get_node(n_clone_idx)); |
0 | 1007 } |
1008 } | |
1009 | |
1010 //------------------------------catch_cleanup_inter_block--------------------- | |
1011 // Fix all input edges in use that reference "def". The use is in a different | |
1012 // block than the def. | |
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1013 void PhaseCFG::catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, int n_clone_idx) { |
0 | 1014 if( !use_blk ) return; // Can happen if the use is a precedence edge |
1015 | |
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1016 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, n_clone_idx); |
0 | 1017 catch_cleanup_fix_all_inputs(use, def, new_def); |
1018 } | |
1019 | |
1020 //------------------------------call_catch_cleanup----------------------------- | |
1021 // If we inserted any instructions between a Call and his CatchNode, | |
1022 // clone the instructions on all paths below the Catch. | |
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1023 void PhaseCFG::call_catch_cleanup(Block* block) { |
0 | 1024 |
1025 // End of region to clone | |
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1026 uint end = block->end_idx(); |
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1027 if( !block->get_node(end)->is_Catch() ) return; |
0 | 1028 // Start of region to clone |
1029 uint beg = end; | |
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1030 while(!block->get_node(beg-1)->is_MachProj() || |
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1031 !block->get_node(beg-1)->in(0)->is_MachCall() ) { |
0 | 1032 beg--; |
1033 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
1034 } | |
1035 // Range of inserted instructions is [beg, end) | |
1036 if( beg == end ) return; | |
1037 | |
1038 // Clone along all Catch output paths. Clone area between the 'beg' and | |
1039 // 'end' indices. | |
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1040 for( uint i = 0; i < block->_num_succs; i++ ) { |
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1041 Block *sb = block->_succs[i]; |
0 | 1042 // Clone the entire area; ignoring the edge fixup for now. |
1043 for( uint j = end; j > beg; j-- ) { | |
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1044 // It is safe here to clone a node with anti_dependence |
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1045 // since clones dominate on each path. |
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1046 Node *clone = block->get_node(j-1)->clone(); |
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1047 sb->insert_node(clone, 1); |
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1048 map_node_to_block(clone, sb); |
0 | 1049 } |
1050 } | |
1051 | |
1052 | |
1053 // Fixup edges. Check the def-use info per cloned Node | |
1054 for(uint i2 = beg; i2 < end; i2++ ) { | |
1055 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
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1056 Node *n = block->get_node(i2); // Node that got cloned |
0 | 1057 // Need DU safe iterator because of edge manipulation in calls. |
1058 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
1059 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
1060 out->push(n->fast_out(j1)); | |
1061 } | |
1062 uint max = out->size(); | |
1063 for (uint j = 0; j < max; j++) {// For all users | |
1064 Node *use = out->pop(); | |
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1065 Block *buse = get_block_for_node(use); |
0 | 1066 if( use->is_Phi() ) { |
1067 for( uint k = 1; k < use->req(); k++ ) | |
1068 if( use->in(k) == n ) { | |
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1069 Block* b = get_block_for_node(buse->pred(k)); |
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1070 Node *fixup = catch_cleanup_find_cloned_def(b, n, block, n_clone_idx); |
0 | 1071 use->set_req(k, fixup); |
1072 } | |
1073 } else { | |
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1074 if (block == buse) { |
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1075 catch_cleanup_intra_block(use, n, block, beg, n_clone_idx); |
0 | 1076 } else { |
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1077 catch_cleanup_inter_block(use, buse, n, block, n_clone_idx); |
0 | 1078 } |
1079 } | |
1080 } // End for all users | |
1081 | |
1082 } // End of for all Nodes in cloned area | |
1083 | |
1084 // Remove the now-dead cloned ops | |
1085 for(uint i3 = beg; i3 < end; i3++ ) { | |
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1086 block->get_node(beg)->disconnect_inputs(NULL, C); |
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1087 block->remove_node(beg); |
0 | 1088 } |
1089 | |
1090 // If the successor blocks have a CreateEx node, move it back to the top | |
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1091 for(uint i4 = 0; i4 < block->_num_succs; i4++ ) { |
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1092 Block *sb = block->_succs[i4]; |
0 | 1093 uint new_cnt = end - beg; |
1094 // Remove any newly created, but dead, nodes. | |
1095 for( uint j = new_cnt; j > 0; j-- ) { | |
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1096 Node *n = sb->get_node(j); |
0 | 1097 if (n->outcnt() == 0 && |
1098 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
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1099 n->disconnect_inputs(NULL, C); |
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1100 sb->remove_node(j); |
0 | 1101 new_cnt--; |
1102 } | |
1103 } | |
1104 // If any newly created nodes remain, move the CreateEx node to the top | |
1105 if (new_cnt > 0) { | |
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1106 Node *cex = sb->get_node(1+new_cnt); |
0 | 1107 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { |
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1108 sb->remove_node(1+new_cnt); |
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1109 sb->insert_node(cex, 1); |
0 | 1110 } |
1111 } | |
1112 } | |
1113 } |