Mercurial > hg > graal-compiler
annotate src/share/vm/opto/lcm.cpp @ 14412:e2722a66aba7
Merge
| author | kvn |
|---|---|
| date | Thu, 05 Sep 2013 11:04:39 -0700 |
| parents | d2907f74462e adb9a7d94cb5 |
| children | 2b8e28fdf503 |
| rev | line source |
|---|---|
| 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: | |
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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 | |
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243 Block *cb = cfg->get_block_for_node(mach); |
| 0 | 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 |
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268 Block *inb = cfg->get_block_for_node(mach->in(j)); |
| 0 | 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; | |
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278 Block *mb = cfg->get_block_for_node(mach); |
| 0 | 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; | |
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297 b = cfg->get_block_for_node(b->pred(1)); // Move up to predecessor block |
| 0 | 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. | |
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309 if (best == NULL || cfg->get_block_for_node(mach)->_dom_depth < cfg->get_block_for_node(best)->_dom_depth) { |
| 0 | 310 best = mach; |
| 311 bidx = vidx; | |
| 312 } | |
| 313 } | |
| 314 // No candidate! | |
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315 if (best == NULL) { |
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316 return; |
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317 } |
| 0 | 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->get_block_for_node(val); |
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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->map_node_to_block(val, 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->get_block_for_node(n)->find_remove(n); |
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337 this->add_inst(n); |
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338 cfg->map_node_to_block(n, 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. |
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344 Block *old_block = cfg->get_block_for_node(best); |
| 0 | 345 old_block->find_remove(best); |
| 346 add_inst(best); | |
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347 cfg->map_node_to_block(best, this); |
| 0 | 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() ) { |
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358 cfg->get_block_for_node(n)->find_remove(n); |
| 0 | 359 add_inst(n); |
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360 cfg->map_node_to_block(n, this); |
| 0 | 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); | |
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391 cfg->map_node_to_block(nul_chk, this); |
| 0 | 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 | |
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474 if (use->is_MachIf() && cfg->get_block_for_node(use) == this) { |
| 0 | 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 | |
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507 uint n_latency = cfg->get_latency_for_node(n); |
| 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---------------------------------- | |
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535 void Block::set_next_call( Node *n, VectorSet &next_call, PhaseCFG* cfg) { |
| 0 | 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 | |
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540 if (cfg->get_block_for_node(m) == this) { |
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541 set_next_call(m, next_call, cfg); |
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542 } |
| 0 | 543 } |
| 544 } | |
| 545 | |
| 546 //------------------------------needed_for_next_call--------------------------- | |
| 547 // Set the flag 'next_call' for each Node that is needed for the next call to | |
| 548 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
| 549 // next subroutine call get priority - basically it moves things NOT needed | |
| 550 // for the next call till after the call. This prevents me from trying to | |
| 551 // carry lots of stuff live across a call. | |
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552 void Block::needed_for_next_call(Node *this_call, VectorSet &next_call, PhaseCFG* cfg) { |
| 0 | 553 // Find the next control-defining Node in this block |
| 554 Node* call = NULL; | |
| 555 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
| 556 Node* m = this_call->fast_out(i); | |
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557 if(cfg->get_block_for_node(m) == this && // Local-block user |
| 0 | 558 m != this_call && // Not self-start node |
| 3842 | 559 m->is_MachCall() ) |
| 0 | 560 call = m; |
| 561 break; | |
| 562 } | |
| 563 if (call == NULL) return; // No next call (e.g., block end is near) | |
| 564 // Set next-call for all inputs to this call | |
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565 set_next_call(call, next_call, cfg); |
| 0 | 566 } |
| 567 | |
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568 //------------------------------add_call_kills------------------------------------- |
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569 void Block::add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe) { |
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570 // Fill in the kill mask for the call |
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571 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { |
|
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572 if( !regs.Member(r) ) { // Not already defined by the call |
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573 // Save-on-call register? |
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574 if ((save_policy[r] == 'C') || |
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575 (save_policy[r] == 'A') || |
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576 ((save_policy[r] == 'E') && exclude_soe)) { |
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577 proj->_rout.Insert(r); |
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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 |
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583 |
| 0 | 584 //------------------------------sched_call------------------------------------- |
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585 uint Block::sched_call( Matcher &matcher, PhaseCFG* cfg, uint node_cnt, Node_List &worklist, GrowableArray<int> &ready_cnt, MachCallNode *mcall, VectorSet &next_call ) { |
| 0 | 586 RegMask regs; |
| 587 | |
| 588 // Schedule all the users of the call right now. All the users are | |
| 589 // projection Nodes, so they must be scheduled next to the call. | |
| 590 // Collect all the defined registers. | |
| 591 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
| 592 Node* n = mcall->fast_out(i); | |
| 3842 | 593 assert( n->is_MachProj(), "" ); |
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594 int n_cnt = ready_cnt.at(n->_idx)-1; |
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595 ready_cnt.at_put(n->_idx, n_cnt); |
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596 assert( n_cnt == 0, "" ); |
| 0 | 597 // Schedule next to call |
| 598 _nodes.map(node_cnt++, n); | |
| 599 // Collect defined registers | |
| 600 regs.OR(n->out_RegMask()); | |
| 601 // Check for scheduling the next control-definer | |
| 602 if( n->bottom_type() == Type::CONTROL ) | |
| 603 // Warm up next pile of heuristic bits | |
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604 needed_for_next_call(n, next_call, cfg); |
| 0 | 605 |
| 606 // Children of projections are now all ready | |
| 607 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
| 608 Node* m = n->fast_out(j); // Get user | |
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609 if(cfg->get_block_for_node(m) != this) { |
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610 continue; |
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611 } |
| 0 | 612 if( m->is_Phi() ) continue; |
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613 int m_cnt = ready_cnt.at(m->_idx)-1; |
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614 ready_cnt.at_put(m->_idx, m_cnt); |
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615 if( m_cnt == 0 ) |
| 0 | 616 worklist.push(m); |
| 617 } | |
| 618 | |
| 619 } | |
| 620 | |
| 621 // Act as if the call defines the Frame Pointer. | |
| 622 // Certainly the FP is alive and well after the call. | |
| 623 regs.Insert(matcher.c_frame_pointer()); | |
| 624 | |
| 625 // Set all registers killed and not already defined by the call. | |
| 626 uint r_cnt = mcall->tf()->range()->cnt(); | |
| 627 int op = mcall->ideal_Opcode(); | |
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628 MachProjNode *proj = new (matcher.C) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); |
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629 cfg->map_node_to_block(proj, this); |
| 0 | 630 _nodes.insert(node_cnt++, proj); |
| 631 | |
| 632 // Select the right register save policy. | |
| 633 const char * save_policy; | |
| 634 switch (op) { | |
| 635 case Op_CallRuntime: | |
| 636 case Op_CallLeaf: | |
| 637 case Op_CallLeafNoFP: | |
| 638 // Calling C code so use C calling convention | |
| 639 save_policy = matcher._c_reg_save_policy; | |
| 640 break; | |
| 641 | |
| 642 case Op_CallStaticJava: | |
| 643 case Op_CallDynamicJava: | |
| 644 // Calling Java code so use Java calling convention | |
| 645 save_policy = matcher._register_save_policy; | |
| 646 break; | |
| 647 | |
| 648 default: | |
| 649 ShouldNotReachHere(); | |
| 650 } | |
| 651 | |
| 652 // When using CallRuntime mark SOE registers as killed by the call | |
| 653 // so values that could show up in the RegisterMap aren't live in a | |
| 654 // callee saved register since the register wouldn't know where to | |
| 655 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
| 656 // have debug info on them. Strictly speaking this only needs to be | |
| 657 // done for oops since idealreg2debugmask takes care of debug info | |
| 658 // references but there no way to handle oops differently than other | |
| 659 // pointers as far as the kill mask goes. | |
| 660 bool exclude_soe = op == Op_CallRuntime; | |
| 661 | |
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662 // If the call is a MethodHandle invoke, we need to exclude the |
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663 // register which is used to save the SP value over MH invokes from |
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664 // the mask. Otherwise this register could be used for |
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665 // deoptimization information. |
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666 if (op == Op_CallStaticJava) { |
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667 MachCallStaticJavaNode* mcallstaticjava = (MachCallStaticJavaNode*) mcall; |
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668 if (mcallstaticjava->_method_handle_invoke) |
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669 proj->_rout.OR(Matcher::method_handle_invoke_SP_save_mask()); |
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670 } |
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671 |
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672 add_call_kills(proj, regs, save_policy, exclude_soe); |
| 0 | 673 |
| 674 return node_cnt; | |
| 675 } | |
| 676 | |
| 677 | |
| 678 //------------------------------schedule_local--------------------------------- | |
| 679 // Topological sort within a block. Someday become a real scheduler. | |
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680 bool Block::schedule_local(PhaseCFG *cfg, Matcher &matcher, GrowableArray<int> &ready_cnt, VectorSet &next_call) { |
| 0 | 681 // Already "sorted" are the block start Node (as the first entry), and |
| 682 // the block-ending Node and any trailing control projections. We leave | |
| 683 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
| 684 // Node. Everything else gets topo-sorted. | |
| 685 | |
| 686 #ifndef PRODUCT | |
| 687 if (cfg->trace_opto_pipelining()) { | |
| 688 tty->print_cr("# --- schedule_local B%d, before: ---", _pre_order); | |
| 689 for (uint i = 0;i < _nodes.size();i++) { | |
| 690 tty->print("# "); | |
| 691 _nodes[i]->fast_dump(); | |
| 692 } | |
| 693 tty->print_cr("#"); | |
| 694 } | |
| 695 #endif | |
| 696 | |
| 697 // RootNode is already sorted | |
| 698 if( _nodes.size() == 1 ) return true; | |
| 699 | |
| 700 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
| 701 uint node_cnt = end_idx(); | |
| 702 uint phi_cnt = 1; | |
| 703 uint i; | |
| 704 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
| 705 Node *n = _nodes[i]; | |
| 706 if( n->is_Phi() || // Found a PhiNode or ParmNode | |
| 707 (n->is_Proj() && n->in(0) == head()) ) { | |
| 708 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt | |
| 709 _nodes.map(i,_nodes[phi_cnt]); | |
| 710 _nodes.map(phi_cnt++,n); // swap Phi/Parm up front | |
| 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 && cfg->get_block_for_node(m) == this && !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(cfg->get_block_for_node(oop_store)->_dom_depth <= this->_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 } | |
| 753 for(uint i2=i; i2<_nodes.size(); i2++ ) // Trailing guys get zapped count | |
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754 ready_cnt.at_put(_nodes[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 | |
| 759 Node *n = _nodes[i3]; // Get pre-scheduled | |
| 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 (cfg->get_block_for_node(m) == this) { // 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 | |
| 773 Node *m = _nodes[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); | |
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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(_nodes[0], next_call, cfg); |
| 0 | 796 |
| 797 #ifndef PRODUCT | |
| 798 if (cfg->trace_opto_pipelining()) { | |
| 799 for (uint j=0; j<_nodes.size(); j++) { | |
| 800 Node *n = _nodes[j]; | |
| 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 ", cfg->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 | |
| 814 if (cfg->trace_opto_pipelining()) { | |
| 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 | |
| 825 Node* n = select(cfg, worklist, ready_cnt, next_call, phi_cnt); | |
| 826 _nodes.map(phi_cnt++,n); // Schedule him next | |
| 827 | |
| 828 #ifndef PRODUCT | |
| 829 if (cfg->trace_opto_pipelining()) { | |
| 830 tty->print("# select %d: %s", n->_idx, n->Name()); | |
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831 tty->print(", latency:%d", cfg->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(matcher, cfg, 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 (matcher.C) MachProjNode( n, 1, RegMask::Empty, MachProjNode::fat_proj ); |
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856 cfg->map_node_to_block(proj, this); |
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857 _nodes.insert(phi_cnt++, proj); |
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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 (cfg->get_block_for_node(m) != this) { |
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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 | |
| 880 if( phi_cnt != end_idx() ) { | |
| 881 // did not schedule all. Retry, Bailout, or Die | |
| 882 Compile* C = matcher.C; | |
| 883 if (C->subsume_loads() == true && !C->failing()) { | |
| 884 // Retry with subsume_loads == false | |
| 885 // If this is the first failure, the sentinel string will "stick" | |
| 886 // to the Compile object, and the C2Compiler will see it and retry. | |
| 887 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
| 888 } | |
| 889 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
| 890 return false; | |
| 891 } | |
| 892 | |
| 893 #ifndef PRODUCT | |
| 894 if (cfg->trace_opto_pipelining()) { | |
| 895 tty->print_cr("#"); | |
| 896 tty->print_cr("# after schedule_local"); | |
| 897 for (uint i = 0;i < _nodes.size();i++) { | |
| 898 tty->print("# "); | |
| 899 _nodes[i]->fast_dump(); | |
| 900 } | |
| 901 tty->cr(); | |
| 902 } | |
| 903 #endif | |
| 904 | |
| 905 | |
| 906 return true; | |
| 907 } | |
| 908 | |
| 909 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
| 910 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
| 911 for (uint l = 0; l < use->len(); l++) { | |
| 912 if (use->in(l) == old_def) { | |
| 913 if (l < use->req()) { | |
| 914 use->set_req(l, new_def); | |
| 915 } else { | |
| 916 use->rm_prec(l); | |
| 917 use->add_prec(new_def); | |
| 918 l--; | |
| 919 } | |
| 920 } | |
| 921 } | |
| 922 } | |
| 923 | |
| 924 //------------------------------catch_cleanup_find_cloned_def------------------ | |
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925 static Node *catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, PhaseCFG* cfg, int n_clone_idx) { |
| 0 | 926 assert( use_blk != def_blk, "Inter-block cleanup only"); |
| 927 | |
| 928 // The use is some block below the Catch. Find and return the clone of the def | |
| 929 // that dominates the use. If there is no clone in a dominating block, then | |
| 930 // create a phi for the def in a dominating block. | |
| 931 | |
| 932 // Find which successor block dominates this use. The successor | |
| 933 // blocks must all be single-entry (from the Catch only; I will have | |
| 934 // split blocks to make this so), hence they all dominate. | |
| 935 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
| 936 use_blk = use_blk->_idom; | |
| 937 | |
| 938 // Find the successor | |
| 939 Node *fixup = NULL; | |
| 940 | |
| 941 uint j; | |
| 942 for( j = 0; j < def_blk->_num_succs; j++ ) | |
| 943 if( use_blk == def_blk->_succs[j] ) | |
| 944 break; | |
| 945 | |
| 946 if( j == def_blk->_num_succs ) { | |
| 947 // Block at same level in dom-tree is not a successor. It needs a | |
| 948 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
| 949 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
| 950 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
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951 Block* block = cfg->get_block_for_node(use_blk->pred(k)); |
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952 inputs.map(k, catch_cleanup_find_cloned_def(block, def, def_blk, cfg, n_clone_idx)); |
| 0 | 953 } |
| 954 | |
| 955 // Check to see if the use_blk already has an identical phi inserted. | |
| 956 // If it exists, it will be at the first position since all uses of a | |
| 957 // def are processed together. | |
| 958 Node *phi = use_blk->_nodes[1]; | |
| 959 if( phi->is_Phi() ) { | |
| 960 fixup = phi; | |
| 961 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
| 962 if (phi->in(k) != inputs[k]) { | |
| 963 // Not a match | |
| 964 fixup = NULL; | |
| 965 break; | |
| 966 } | |
| 967 } | |
| 968 } | |
| 969 | |
| 970 // If an existing PhiNode was not found, make a new one. | |
| 971 if (fixup == NULL) { | |
| 972 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
| 973 use_blk->_nodes.insert(1, new_phi); | |
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974 cfg->map_node_to_block(new_phi, use_blk); |
| 0 | 975 for (uint k = 1; k < use_blk->num_preds(); k++) { |
| 976 new_phi->set_req(k, inputs[k]); | |
| 977 } | |
| 978 fixup = new_phi; | |
| 979 } | |
| 980 | |
| 981 } else { | |
| 982 // Found the use just below the Catch. Make it use the clone. | |
| 983 fixup = use_blk->_nodes[n_clone_idx]; | |
| 984 } | |
| 985 | |
| 986 return fixup; | |
| 987 } | |
| 988 | |
| 989 //--------------------------catch_cleanup_intra_block-------------------------- | |
| 990 // Fix all input edges in use that reference "def". The use is in the same | |
| 991 // block as the def and both have been cloned in each successor block. | |
| 992 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
| 993 | |
| 994 // Both the use and def have been cloned. For each successor block, | |
| 995 // get the clone of the use, and make its input the clone of the def | |
| 996 // found in that block. | |
| 997 | |
| 998 uint use_idx = blk->find_node(use); | |
| 999 uint offset_idx = use_idx - beg; | |
| 1000 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
| 1001 // Get clone in each successor block | |
| 1002 Block *sb = blk->_succs[k]; | |
| 1003 Node *clone = sb->_nodes[offset_idx+1]; | |
| 1004 assert( clone->Opcode() == use->Opcode(), "" ); | |
| 1005 | |
| 1006 // Make use-clone reference the def-clone | |
| 1007 catch_cleanup_fix_all_inputs(clone, def, sb->_nodes[n_clone_idx]); | |
| 1008 } | |
| 1009 } | |
| 1010 | |
| 1011 //------------------------------catch_cleanup_inter_block--------------------- | |
| 1012 // Fix all input edges in use that reference "def". The use is in a different | |
| 1013 // block than the def. | |
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1014 static void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, PhaseCFG* cfg, int n_clone_idx) { |
| 0 | 1015 if( !use_blk ) return; // Can happen if the use is a precedence edge |
| 1016 | |
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1017 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, cfg, n_clone_idx); |
| 0 | 1018 catch_cleanup_fix_all_inputs(use, def, new_def); |
| 1019 } | |
| 1020 | |
| 1021 //------------------------------call_catch_cleanup----------------------------- | |
| 1022 // If we inserted any instructions between a Call and his CatchNode, | |
| 1023 // clone the instructions on all paths below the Catch. | |
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1024 void Block::call_catch_cleanup(PhaseCFG* cfg, Compile* C) { |
| 0 | 1025 |
| 1026 // End of region to clone | |
| 1027 uint end = end_idx(); | |
| 1028 if( !_nodes[end]->is_Catch() ) return; | |
| 1029 // Start of region to clone | |
| 1030 uint beg = end; | |
| 3842 | 1031 while(!_nodes[beg-1]->is_MachProj() || |
| 1032 !_nodes[beg-1]->in(0)->is_MachCall() ) { | |
| 0 | 1033 beg--; |
| 1034 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
| 1035 } | |
| 1036 // Range of inserted instructions is [beg, end) | |
| 1037 if( beg == end ) return; | |
| 1038 | |
| 1039 // Clone along all Catch output paths. Clone area between the 'beg' and | |
| 1040 // 'end' indices. | |
| 1041 for( uint i = 0; i < _num_succs; i++ ) { | |
| 1042 Block *sb = _succs[i]; | |
| 1043 // Clone the entire area; ignoring the edge fixup for now. | |
| 1044 for( uint j = end; j > beg; j-- ) { | |
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1045 // It is safe here to clone a node with anti_dependence |
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1046 // since clones dominate on each path. |
| 0 | 1047 Node *clone = _nodes[j-1]->clone(); |
| 1048 sb->_nodes.insert( 1, clone ); | |
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1049 cfg->map_node_to_block(clone, sb); |
| 0 | 1050 } |
| 1051 } | |
| 1052 | |
| 1053 | |
| 1054 // Fixup edges. Check the def-use info per cloned Node | |
| 1055 for(uint i2 = beg; i2 < end; i2++ ) { | |
| 1056 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
| 1057 Node *n = _nodes[i2]; // Node that got cloned | |
| 1058 // Need DU safe iterator because of edge manipulation in calls. | |
| 1059 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
| 1060 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
| 1061 out->push(n->fast_out(j1)); | |
| 1062 } | |
| 1063 uint max = out->size(); | |
| 1064 for (uint j = 0; j < max; j++) {// For all users | |
| 1065 Node *use = out->pop(); | |
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1066 Block *buse = cfg->get_block_for_node(use); |
| 0 | 1067 if( use->is_Phi() ) { |
| 1068 for( uint k = 1; k < use->req(); k++ ) | |
| 1069 if( use->in(k) == n ) { | |
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1070 Block* block = cfg->get_block_for_node(buse->pred(k)); |
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1071 Node *fixup = catch_cleanup_find_cloned_def(block, n, this, cfg, n_clone_idx); |
| 0 | 1072 use->set_req(k, fixup); |
| 1073 } | |
| 1074 } else { | |
| 1075 if (this == buse) { | |
| 1076 catch_cleanup_intra_block(use, n, this, beg, n_clone_idx); | |
| 1077 } else { | |
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1078 catch_cleanup_inter_block(use, buse, n, this, cfg, n_clone_idx); |
| 0 | 1079 } |
| 1080 } | |
| 1081 } // End for all users | |
| 1082 | |
| 1083 } // End of for all Nodes in cloned area | |
| 1084 | |
| 1085 // Remove the now-dead cloned ops | |
| 1086 for(uint i3 = beg; i3 < end; i3++ ) { | |
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1087 _nodes[beg]->disconnect_inputs(NULL, C); |
| 0 | 1088 _nodes.remove(beg); |
| 1089 } | |
| 1090 | |
| 1091 // If the successor blocks have a CreateEx node, move it back to the top | |
| 1092 for(uint i4 = 0; i4 < _num_succs; i4++ ) { | |
| 1093 Block *sb = _succs[i4]; | |
| 1094 uint new_cnt = end - beg; | |
| 1095 // Remove any newly created, but dead, nodes. | |
| 1096 for( uint j = new_cnt; j > 0; j-- ) { | |
| 1097 Node *n = sb->_nodes[j]; | |
| 1098 if (n->outcnt() == 0 && | |
| 1099 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
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1100 n->disconnect_inputs(NULL, C); |
| 0 | 1101 sb->_nodes.remove(j); |
| 1102 new_cnt--; | |
| 1103 } | |
| 1104 } | |
| 1105 // If any newly created nodes remain, move the CreateEx node to the top | |
| 1106 if (new_cnt > 0) { | |
| 1107 Node *cex = sb->_nodes[1+new_cnt]; | |
| 1108 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { | |
| 1109 sb->_nodes.remove(1+new_cnt); | |
| 1110 sb->_nodes.insert(1,cex); | |
| 1111 } | |
| 1112 } | |
| 1113 } | |
| 1114 } |