Changeset 96443 in webkit
- Timestamp:
- Sep 30, 2011 5:58:15 PM (13 years ago)
- Location:
- trunk/Source/JavaScriptCore
- Files:
-
- 9 edited
Legend:
- Unmodified
- Added
- Removed
-
trunk/Source/JavaScriptCore/ChangeLog
r96438 r96443 1 2011-09-30 Filip Pizlo <fpizlo@apple.com> 2 3 DFG does not speculate aggressively enough on put_by_id 4 https://bugs.webkit.org/show_bug.cgi?id=69114 5 6 Reviewed by Oliver Hunt. 7 8 This adds new nodes along with optimizations for those nodes: 9 10 GetPropertyStorage: CheckStructure used to do both the structure 11 check and retrieve the storage pointer. Now CheckStructure just 12 checks the structure, and GetPropertyStorage retrieves the 13 storage pointer. 14 15 PutStructure: Changes the structure, and has the expected store 16 to load optimization with CheckStructure. 17 18 PutByOffset: Directly sets the value. Has store to load 19 optimization with GetByOffset. 20 21 * dfg/DFGByteCodeParser.cpp: 22 (JSC::DFG::ByteCodeParser::cellConstant): 23 (JSC::DFG::ByteCodeParser::parseBlock): 24 * dfg/DFGGraph.cpp: 25 (JSC::DFG::Graph::dump): 26 * dfg/DFGJITCodeGenerator.cpp: 27 (JSC::DFG::JITCodeGenerator::writeBarrier): 28 * dfg/DFGJITCodeGenerator.h: 29 * dfg/DFGNode.h: 30 (JSC::DFG::Node::hasStructure): 31 (JSC::DFG::Node::hasStorageAccessData): 32 * dfg/DFGPropagator.cpp: 33 (JSC::DFG::Propagator::propagateNodePredictions): 34 (JSC::DFG::Propagator::impureCSE): 35 (JSC::DFG::Propagator::checkStructureLoadElimination): 36 (JSC::DFG::Propagator::getByOffsetLoadElimination): 37 (JSC::DFG::Propagator::getPropertyStorageLoadElimination): 38 (JSC::DFG::Propagator::eliminate): 39 (JSC::DFG::Propagator::performNodeCSE): 40 * dfg/DFGSpeculativeJIT32_64.cpp: 41 (JSC::DFG::SpeculativeJIT::compile): 42 * dfg/DFGSpeculativeJIT64.cpp: 43 (JSC::DFG::SpeculativeJIT::compile): 44 1 45 2011-09-30 Gavin Barraclough <barraclough@apple.com> 2 46 -
trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
r96391 r96443 31 31 #include "DFGCapabilities.h" 32 32 #include "CodeBlock.h" 33 #include <wtf/HashMap.h> 33 34 #include <wtf/MathExtras.h> 34 35 … … 405 406 } 406 407 408 NodeIndex cellConstant(JSCell* cell) 409 { 410 HashMap<JSCell*, unsigned>::iterator iter = m_cellConstants.find(cell); 411 if (iter != m_cellConstants.end()) 412 return getJSConstant(iter->second); 413 414 m_codeBlock->addConstant(cell); 415 m_constants.append(ConstantRecord()); 416 ASSERT(m_constants.size() == m_codeBlock->numberOfConstantRegisters()); 417 418 return getJSConstant(m_codeBlock->numberOfConstantRegisters() - 1); 419 } 420 407 421 CodeOrigin currentCodeOrigin() 408 422 { … … 577 591 unsigned m_constantNaN; 578 592 unsigned m_constant1; 593 HashMap<JSCell*, unsigned> m_cellConstants; 579 594 580 595 // A constant in the constant pool may be represented by more than one … … 1155 1170 1156 1171 if (offset != notFound) { 1157 getById = addToGraph(GetByOffset, OpInfo(m_graph.m_storageAccessData.size()), OpInfo(prediction), addToGraph(CheckStructure, OpInfo(structure), base)); 1172 addToGraph(CheckStructure, OpInfo(structure), base); 1173 getById = addToGraph(GetByOffset, OpInfo(m_graph.m_storageAccessData.size()), OpInfo(prediction), addToGraph(GetPropertyStorage, base)); 1158 1174 1159 1175 StorageAccessData storageAccessData; … … 1175 1191 NodeIndex value = get(currentInstruction[3].u.operand); 1176 1192 NodeIndex base = get(currentInstruction[1].u.operand); 1177 unsigned identifier = currentInstruction[2].u.operand;1193 unsigned identifierNumber = currentInstruction[2].u.operand; 1178 1194 bool direct = currentInstruction[8].u.operand; 1179 1195 1180 if (direct) 1181 addToGraph(PutByIdDirect, OpInfo(identifier), base, value); 1182 else 1183 addToGraph(PutById, OpInfo(identifier), base, value); 1196 StructureStubInfo& stubInfo = m_profiledBlock->getStubInfo(m_currentIndex); 1197 if (!stubInfo.seen) 1198 addToGraph(ForceOSRExit); 1199 1200 bool alreadyGenerated = false; 1201 1202 if (stubInfo.seen && !m_profiledBlock->likelyToTakeSlowCase(m_currentIndex)) { 1203 switch (stubInfo.accessType) { 1204 case access_put_by_id_replace: { 1205 Structure* structure = stubInfo.u.putByIdReplace.baseObjectStructure.get(); 1206 Identifier identifier = m_codeBlock->identifier(identifierNumber); 1207 size_t offset = structure->get(*m_globalData, identifier); 1208 1209 if (offset != notFound) { 1210 addToGraph(CheckStructure, OpInfo(structure), base); 1211 addToGraph(PutByOffset, OpInfo(m_graph.m_storageAccessData.size()), base, addToGraph(GetPropertyStorage, base), value); 1212 1213 StorageAccessData storageAccessData; 1214 storageAccessData.offset = offset; 1215 storageAccessData.identifierNumber = identifierNumber; 1216 m_graph.m_storageAccessData.append(storageAccessData); 1217 1218 alreadyGenerated = true; 1219 } 1220 break; 1221 } 1222 1223 case access_put_by_id_transition: { 1224 Structure* previousStructure = stubInfo.u.putByIdTransition.previousStructure.get(); 1225 Structure* newStructure = stubInfo.u.putByIdTransition.structure.get(); 1226 1227 if (previousStructure->propertyStorageCapacity() != newStructure->propertyStorageCapacity()) 1228 break; 1229 1230 StructureChain* structureChain = stubInfo.u.putByIdTransition.chain.get(); 1231 1232 Identifier identifier = m_codeBlock->identifier(identifierNumber); 1233 size_t offset = newStructure->get(*m_globalData, identifier); 1234 1235 if (offset != notFound) { 1236 addToGraph(CheckStructure, OpInfo(previousStructure), base); 1237 if (!direct) { 1238 for (WriteBarrier<Structure>* it = structureChain->head(); *it; ++it) { 1239 JSValue prototype = (*it)->storedPrototype(); 1240 if (prototype.isNull()) 1241 continue; 1242 ASSERT(prototype.isCell()); 1243 addToGraph(CheckStructure, OpInfo(prototype.asCell()->structure()), cellConstant(prototype.asCell())); 1244 } 1245 } 1246 addToGraph(PutStructure, OpInfo(newStructure), base); 1247 1248 addToGraph(PutByOffset, OpInfo(m_graph.m_storageAccessData.size()), base, addToGraph(GetPropertyStorage, base), value); 1249 1250 StorageAccessData storageAccessData; 1251 storageAccessData.offset = offset; 1252 storageAccessData.identifierNumber = identifierNumber; 1253 m_graph.m_storageAccessData.append(storageAccessData); 1254 1255 alreadyGenerated = true; 1256 } 1257 break; 1258 } 1259 1260 default: 1261 break; 1262 } 1263 } 1264 1265 if (!alreadyGenerated) { 1266 if (direct) 1267 addToGraph(PutByIdDirect, OpInfo(identifierNumber), base, value); 1268 else 1269 addToGraph(PutById, OpInfo(identifierNumber), base, value); 1270 } 1184 1271 1185 1272 NEXT_OPCODE(op_put_by_id); -
trunk/Source/JavaScriptCore/dfg/DFGGraph.cpp
r96375 r96443 150 150 hasPrinted = true; 151 151 } 152 if (node.hasStructure()) { 153 printf("%sstruct(%p)", hasPrinted ? ", " : "", node.structure()); 154 hasPrinted = true; 155 } 156 if (node.hasStorageAccessData()) { 157 StorageAccessData& storageAccessData = m_storageAccessData[node.storageAccessDataIndex()]; 158 if (codeBlock) 159 printf("%sid%u{%s}", hasPrinted ? ", " : "", storageAccessData.identifierNumber, codeBlock->identifier(storageAccessData.identifierNumber).ustring().utf8().data()); 160 else 161 printf("%sid%u", hasPrinted ? ", " : "", storageAccessData.identifierNumber); 162 163 printf(", %lu", storageAccessData.offset); 164 hasPrinted = true; 165 } 152 166 ASSERT(node.hasVariableAccessData() == node.hasLocal()); 153 167 if (node.hasVariableAccessData()) { -
trunk/Source/JavaScriptCore/dfg/DFGJITCodeGenerator.cpp
r96377 r96443 268 268 } 269 269 270 void JITCodeGenerator::writeBarrier(GPRReg ownerGPR, JSCell* value, WriteBarrierUseKind useKind, GPRReg scratch1, GPRReg scratch2) 271 { 272 UNUSED_PARAM(ownerGPR); 273 UNUSED_PARAM(value); 274 UNUSED_PARAM(scratch1); 275 UNUSED_PARAM(scratch2); 276 UNUSED_PARAM(useKind); 277 278 if (Heap::isMarked(value)) 279 return; 280 281 #if ENABLE(WRITE_BARRIER_PROFILING) 282 JITCompiler::emitCount(jit, WriteBarrierCounters::jitCounterFor(useKind)); 283 #endif 284 285 #if ENABLE(GGC) 286 GPRTemporary temp1; 287 GPRTemporary temp2; 288 if (scratch1 == InvalidGPRReg) { 289 GPRTemporary scratchGPR(this); 290 temp1.adopt(scratchGPR); 291 scratch1 = temp1.gpr(); 292 } 293 if (scratch2 == InvalidGPRReg) { 294 GPRTemporary scratchGPR(this); 295 temp2.adopt(scratchGPR); 296 scratch2 = temp2.gpr(); 297 } 298 299 markCellCard(m_jit, ownerGPR, scratch1, scratch2); 300 #endif 301 } 302 270 303 void JITCodeGenerator::writeBarrier(JSCell* owner, GPRReg valueGPR, NodeIndex valueIndex, WriteBarrierUseKind useKind, GPRReg scratch) 271 304 { -
trunk/Source/JavaScriptCore/dfg/DFGJITCodeGenerator.h
r96415 r96443 215 215 216 216 void writeBarrier(GPRReg ownerGPR, GPRReg valueGPR, NodeIndex valueIndex, WriteBarrierUseKind, GPRReg scratchGPR1 = InvalidGPRReg, GPRReg scratchGPR2 = InvalidGPRReg); 217 void writeBarrier(GPRReg ownerGPR, JSCell* value, WriteBarrierUseKind, GPRReg scratchGPR1 = InvalidGPRReg, GPRReg scratchGPR2 = InvalidGPRReg); 217 218 void writeBarrier(JSCell* owner, GPRReg valueGPR, NodeIndex valueIndex, WriteBarrierUseKind, GPRReg scratchGPR1 = InvalidGPRReg); 218 219 -
trunk/Source/JavaScriptCore/dfg/DFGNode.h
r96389 r96443 314 314 macro(PutById, NodeMustGenerate | NodeClobbersWorld) \ 315 315 macro(PutByIdDirect, NodeMustGenerate | NodeClobbersWorld) \ 316 macro(CheckStructure, NodeResultStorage | NodeMustGenerate) \ 316 macro(CheckStructure, NodeMustGenerate) \ 317 macro(PutStructure, NodeMustGenerate | NodeClobbersWorld) \ 318 macro(GetPropertyStorage, NodeResultStorage) \ 317 319 macro(GetByOffset, NodeResultJS) \ 320 macro(PutByOffset, NodeMustGenerate | NodeClobbersWorld) \ 318 321 macro(GetArrayLength, NodeResultInt32) \ 319 322 macro(GetMethod, NodeResultJS | NodeMustGenerate) \ … … 783 786 bool hasStructure() 784 787 { 785 return op == CheckStructure ;788 return op == CheckStructure || op == PutStructure; 786 789 } 787 790 … … 793 796 bool hasStorageAccessData() 794 797 { 795 return op == GetByOffset ;798 return op == GetByOffset || op == PutByOffset; 796 799 } 797 800 -
trunk/Source/JavaScriptCore/dfg/DFGPropagator.cpp
r96375 r96443 449 449 } 450 450 451 case CheckStructure: {451 case GetPropertyStorage: { 452 452 changed |= setPrediction(PredictOther); 453 453 break; … … 584 584 case PutById: 585 585 case PutByIdDirect: 586 case CheckStructure: 587 case PutStructure: 588 case PutByOffset: 586 589 break; 587 590 … … 889 892 } 890 893 894 NodeIndex impureCSE(Node& node) 895 { 896 NodeIndex child1 = canonicalize(node.child1()); 897 NodeIndex child2 = canonicalize(node.child2()); 898 NodeIndex child3 = canonicalize(node.child3()); 899 900 NodeIndex start = startIndex(); 901 for (NodeIndex index = m_compileIndex; index-- > start;) { 902 Node& otherNode = m_graph[index]; 903 if (node.op == otherNode.op 904 && node.arithNodeFlagsForCompare() == otherNode.arithNodeFlagsForCompare()) { 905 NodeIndex otherChild = canonicalize(otherNode.child1()); 906 if (otherChild == NoNode) 907 return index; 908 if (otherChild == child1) { 909 otherChild = canonicalize(otherNode.child2()); 910 if (otherChild == NoNode) 911 return index; 912 if (otherChild == child2) { 913 otherChild = canonicalize(otherNode.child3()); 914 if (otherChild == NoNode) 915 return index; 916 if (otherChild == child3) 917 return index; 918 } 919 } 920 } 921 if (clobbersWorld(index)) 922 break; 923 } 924 return NoNode; 925 } 926 891 927 NodeIndex globalVarLoadElimination(unsigned varNumber) 892 928 { … … 951 987 } 952 988 953 NodeIndexcheckStructureLoadElimination(Structure* structure, NodeIndex child1)989 bool checkStructureLoadElimination(Structure* structure, NodeIndex child1) 954 990 { 955 991 NodeIndex start = startIndexForChildren(child1); 956 992 for (NodeIndex index = m_compileIndex; index-- > start;) { 957 993 Node& node = m_graph[index]; 958 if (node.op == CheckStructure 959 && node.child1() == child1 960 && node.structure() == structure) 961 return index; 962 if (clobbersWorld(index)) 963 break; 964 } 965 return NoNode; 994 switch (node.op) { 995 case CheckStructure: 996 if (node.child1() == child1 997 && node.structure() == structure) 998 return true; 999 break; 1000 1001 case PutStructure: 1002 if (node.child1() == child1 1003 && node.structure() == structure) 1004 return true; 1005 return false; 1006 1007 case PutByOffset: 1008 // Setting a property cannot change the structure. 1009 break; 1010 1011 default: 1012 if (clobbersWorld(index)) 1013 return false; 1014 break; 1015 } 1016 } 1017 return false; 966 1018 } 967 1019 … … 971 1023 for (NodeIndex index = m_compileIndex; index-- > start;) { 972 1024 Node& node = m_graph[index]; 973 if (node.op == GetByOffset 974 && node.child1() == child1 975 && m_graph.m_storageAccessData[node.storageAccessDataIndex()].identifierNumber == identifierNumber) 976 return index; 977 if (clobbersWorld(index)) 978 break; 1025 switch (node.op) { 1026 case GetByOffset: 1027 if (node.child1() == child1 1028 && m_graph.m_storageAccessData[node.storageAccessDataIndex()].identifierNumber == identifierNumber) 1029 return index; 1030 break; 1031 1032 case PutByOffset: 1033 if (m_graph.m_storageAccessData[node.storageAccessDataIndex()].identifierNumber == identifierNumber) { 1034 if (node.child2() == child1) 1035 return node.child3(); 1036 return NoNode; 1037 } 1038 break; 1039 1040 case PutStructure: 1041 // Changing the structure cannot change the outcome of a property get. 1042 break; 1043 1044 default: 1045 if (clobbersWorld(index)) 1046 return NoNode; 1047 break; 1048 } 1049 } 1050 return NoNode; 1051 } 1052 1053 NodeIndex getPropertyStorageLoadElimination(NodeIndex child1) 1054 { 1055 NodeIndex start = startIndexForChildren(child1); 1056 for (NodeIndex index = m_compileIndex; index-- > start;) { 1057 Node& node = m_graph[index]; 1058 switch (node.op) { 1059 case GetPropertyStorage: 1060 if (node.child1() == child1) 1061 return index; 1062 break; 1063 1064 case PutByOffset: 1065 case PutStructure: 1066 // Changing the structure or putting to the storage cannot 1067 // change the property storage pointer. 1068 break; 1069 1070 default: 1071 if (clobbersWorld(index)) 1072 return NoNode; 1073 break; 1074 } 979 1075 } 980 1076 return NoNode; … … 1033 1129 // At this point we will eliminate all references to this node. 1034 1130 m_replacements[m_compileIndex] = replacement; 1131 } 1132 1133 void eliminate() 1134 { 1135 #if ENABLE(DFG_DEBUG_PROPAGATION_VERBOSE) 1136 printf(" Eliminating @%u", m_compileIndex); 1137 #endif 1138 1139 Node& node = m_graph[m_compileIndex]; 1140 ASSERT(node.refCount() == 1); 1141 ASSERT(node.mustGenerate()); 1142 node.op = Phantom; 1035 1143 } 1036 1144 … … 1134 1242 1135 1243 case CheckStructure: 1136 setReplacement(checkStructureLoadElimination(node.structure(), node.child1())); 1244 if (checkStructureLoadElimination(node.structure(), node.child1())) 1245 eliminate(); 1246 break; 1247 1248 case GetPropertyStorage: 1249 setReplacement(getPropertyStorageLoadElimination(node.child1())); 1137 1250 break; 1138 1251 -
trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp
r96436 r96443 1658 1658 case CheckStructure: { 1659 1659 SpeculateCellOperand base(this, node.child1()); 1660 1661 GPRReg baseGPR = base.gpr(); 1662 1663 speculationCheck(m_jit.branchPtr(JITCompiler::NotEqual, JITCompiler::Address(baseGPR, JSCell::structureOffset()), JITCompiler::TrustedImmPtr(node.structure()))); 1664 1665 noResult(m_compileIndex); 1666 break; 1667 } 1668 1669 case PutStructure: { 1670 SpeculateCellOperand base(this, node.child1()); 1671 GPRReg baseGPR = base.gpr(); 1672 1673 #if ENABLE(GGC) || ENABLE(WRITE_BARRIER_PROFILING) 1674 // Must always emit this write barrier as the structure transition itself requires it 1675 writeBarrier(baseGPR, node.structure(), WriteBarrierForGenericAccess); 1676 #endif 1677 1678 m_jit.storePtr(MacroAssembler::TrustedImmPtr(node.structure()), MacroAssembler::Address(baseGPR, JSCell::structureOffset())); 1679 1680 noResult(m_compileIndex); 1681 break; 1682 } 1683 1684 case GetPropertyStorage: { 1685 SpeculateCellOperand base(this, node.child1()); 1660 1686 GPRTemporary result(this, base); 1661 1687 1662 1688 GPRReg baseGPR = base.gpr(); 1663 1689 GPRReg resultGPR = result.gpr(); 1664 1665 speculationCheck(m_jit.branchPtr(JITCompiler::NotEqual, JITCompiler::Address(baseGPR, JSCell::structureOffset()), JITCompiler::TrustedImmPtr(node.structure())));1666 1690 1667 1691 m_jit.loadPtr(JITCompiler::Address(baseGPR, JSObject::offsetOfPropertyStorage()), resultGPR); … … 1686 1710 1687 1711 jsValueResult(resultTagGPR, resultPayloadGPR, m_compileIndex); 1712 break; 1713 } 1714 1715 case PutByOffset: { 1716 #if ENABLE(GGC) || ENABLE(WRITE_BARRIER_PROFILING) 1717 SpeculateCellOperand base(this, node.child1()); 1718 #endif 1719 StorageOperand storage(this, node.child2()); 1720 JSValueOperand value(this, node.child3()); 1721 1722 GPRReg storageGPR = storage.gpr(); 1723 GPRReg valueTagGPR = value.tagGPR(); 1724 GPRReg valuePayloadGPR = value.payloadGPR(); 1725 1726 #if ENABLE(GGC) || ENABLE(WRITE_BARRIER_PROFILING) 1727 writeBarrier(base.gpr(), valueTagGPR, node.child3(), WriteBarrierForPropertyAccess); 1728 #endif 1729 1730 StorageAccessData& storageAccessData = m_jit.graph().m_storageAccessData[node.storageAccessDataIndex()]; 1731 1732 m_jit.storePtr(valueTagGPR, JITCompiler::Address(storageGPR, storageAccessData.offset * sizeof(EncodedJSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag))); 1733 m_jit.storePtr(valuePayloadGPR, JITCompiler::Address(storageGPR, storageAccessData.offset * sizeof(EncodedJSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload))); 1734 1735 noResult(m_compileIndex); 1688 1736 break; 1689 1737 } -
trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp
r96436 r96443 1718 1718 case CheckStructure: { 1719 1719 SpeculateCellOperand base(this, node.child1()); 1720 1721 GPRReg baseGPR = base.gpr(); 1722 1723 speculationCheck(m_jit.branchPtr(JITCompiler::NotEqual, JITCompiler::Address(baseGPR, JSCell::structureOffset()), JITCompiler::TrustedImmPtr(node.structure()))); 1724 1725 noResult(m_compileIndex); 1726 break; 1727 } 1728 1729 case PutStructure: { 1730 SpeculateCellOperand base(this, node.child1()); 1731 GPRReg baseGPR = base.gpr(); 1732 1733 #if ENABLE(GGC) || ENABLE(WRITE_BARRIER_PROFILING) 1734 // Must always emit this write barrier as the structure transition itself requires it 1735 writeBarrier(baseGPR, node.structure(), WriteBarrierForGenericAccess); 1736 #endif 1737 1738 m_jit.storePtr(MacroAssembler::TrustedImmPtr(node.structure()), MacroAssembler::Address(baseGPR, JSCell::structureOffset())); 1739 1740 noResult(m_compileIndex); 1741 break; 1742 } 1743 1744 case GetPropertyStorage: { 1745 SpeculateCellOperand base(this, node.child1()); 1720 1746 GPRTemporary result(this, base); 1721 1747 1722 1748 GPRReg baseGPR = base.gpr(); 1723 1749 GPRReg resultGPR = result.gpr(); 1724 1725 speculationCheck(m_jit.branchPtr(JITCompiler::NotEqual, JITCompiler::Address(baseGPR, JSCell::structureOffset()), JITCompiler::TrustedImmPtr(node.structure())));1726 1750 1727 1751 m_jit.loadPtr(JITCompiler::Address(baseGPR, JSObject::offsetOfPropertyStorage()), resultGPR); … … 1743 1767 1744 1768 jsValueResult(resultGPR, m_compileIndex); 1769 break; 1770 } 1771 1772 case PutByOffset: { 1773 #if ENABLE(GGC) || ENABLE(WRITE_BARRIER_PROFILING) 1774 SpeculateCellOperand base(this, node.child1()); 1775 #endif 1776 StorageOperand storage(this, node.child2()); 1777 JSValueOperand value(this, node.child3()); 1778 1779 GPRReg storageGPR = storage.gpr(); 1780 GPRReg valueGPR = value.gpr(); 1781 1782 #if ENABLE(GGC) || ENABLE(WRITE_BARRIER_PROFILING) 1783 writeBarrier(base.gpr(), value.gpr(), node.child3(), WriteBarrierForPropertyAccess); 1784 #endif 1785 1786 StorageAccessData& storageAccessData = m_jit.graph().m_storageAccessData[node.storageAccessDataIndex()]; 1787 1788 m_jit.storePtr(valueGPR, JITCompiler::Address(storageGPR, storageAccessData.offset * sizeof(EncodedJSValue))); 1789 1790 noResult(m_compileIndex); 1745 1791 break; 1746 1792 }
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