source: icGREP/icgrep-devel/icgrep/pablo/pablo_compiler.cpp @ 4843

Last change on this file since 4843 was 4843, checked in by cameron, 4 years ago

Move genPrintRegister into IDISA builder; fix GCB defs

File size: 20.6 KB
Line 
1/*
2 *  Copyright (c) 2014-15 International Characters.
3 *  This software is licensed to the public under the Open Software License 3.0.
4 *  icgrep is a trademark of International Characters.
5 */
6
7#include <pablo/pablo_compiler.h>
8#include <pablo/codegenstate.h>
9#include <pablo/carry_data.h>
10#include <pablo/carry_manager.h>
11#include <pablo/printer_pablos.h>
12#include <pablo/function.h>
13#include <re/re_name.h>
14#include <stdexcept>
15#include <include/simd-lib/bitblock.hpp>
16#include <sstream>
17#include <IDISA/idisa_builder.h>
18#include <llvm/IR/Verifier.h>
19#include <llvm/Pass.h>
20#include <llvm/PassManager.h>
21#include <llvm/ADT/SmallVector.h>
22#include <llvm/Analysis/Passes.h>
23#include <llvm/IR/BasicBlock.h>
24#include <llvm/IR/CallingConv.h>
25#include <llvm/IR/DataLayout.h>
26#include <llvm/IR/DerivedTypes.h>
27#include <llvm/IR/Function.h>
28#include <llvm/IR/GlobalVariable.h>
29#include <llvm/IR/InlineAsm.h>
30#include <llvm/IR/Instructions.h>
31#include <llvm/IR/LLVMContext.h>
32#include <llvm/IR/Module.h>
33#include <llvm/Support/FormattedStream.h>
34#include <llvm/Support/MathExtras.h>
35#include <llvm/Support/Casting.h>
36#include <llvm/Support/Compiler.h>
37#include <llvm/Support/Debug.h>
38#include <llvm/Support/TargetSelect.h>
39#include <llvm/Support/Host.h>
40#include <llvm/Transforms/Scalar.h>
41#include <llvm/IRReader/IRReader.h>
42#include <llvm/Bitcode/ReaderWriter.h>
43#include <llvm/Support/MemoryBuffer.h>
44#include <llvm/IR/IRBuilder.h>
45#include <llvm/Support/CommandLine.h>
46#include <llvm/ADT/Twine.h>
47#include <iostream>
48
49static cl::OptionCategory eIRDumpOptions("LLVM IR Dump Options", "These options control dumping of LLVM IR.");
50static cl::opt<bool> DumpGeneratedIR("dump-generated-IR", cl::init(false), cl::desc("Print LLVM IR generated by Pablo Compiler."), cl::cat(eIRDumpOptions));
51
52static cl::OptionCategory fTracingOptions("Run-time Tracing Options", "These options control execution traces.");
53static cl::opt<bool> DumpTrace("dump-trace", cl::init(false), cl::desc("Generate dynamic traces of executed assignments."), cl::cat(fTracingOptions));
54
55namespace pablo {
56
57PabloCompiler::PabloCompiler(Type * bitBlockType)
58: mMod(nullptr)
59, mBuilder(nullptr)
60, mCarryManager(nullptr)
61, mBitBlockType(bitBlockType)
62, iBuilder(mBitBlockType)
63, mInputType(nullptr)
64, mWhileDepth(0)
65, mIfDepth(0)
66, mFunction(nullptr)
67, mInputAddressPtr(nullptr)
68, mOutputAddressPtr(nullptr)
69, mMaxWhileDepth(0) {
70
71}
72
73PabloCompiler::~PabloCompiler() {
74}
75   
76
77llvm::Function * PabloCompiler::compile(PabloFunction * function) {
78    Module * module = new Module("", getGlobalContext());
79   
80    auto func = compile(function, module);
81   
82    //Display the IR that has been generated by this module.
83    if (LLVM_UNLIKELY(DumpGeneratedIR)) {
84        module->dump();
85    }
86    //Create a verifier.  The verifier will print an error message if our module is malformed in any way.
87    verifyModule(*module, &dbgs());
88
89    return func;
90}
91
92llvm::Function * PabloCompiler::compile(PabloFunction * function, Module * module) {
93
94 
95    PabloBlock & mainScope = function->getEntryBlock();
96
97    mainScope.enumerateScopes(0);
98   
99    Examine(*function);
100
101    mMod = module;
102
103    mBuilder = new IRBuilder<>(mMod->getContext());
104
105    iBuilder.initialize(mMod, mBuilder);
106
107    mCarryManager = new CarryManager(mBuilder, &iBuilder);
108   
109    GenerateFunction(*function);
110   
111    mBuilder->SetInsertPoint(BasicBlock::Create(mMod->getContext(), "entry", mFunction,0));
112
113    //The basis bits structure
114    for (unsigned i = 0; i != function->getNumOfParameters(); ++i) {
115        Value* indices[] = {mBuilder->getInt64(0), mBuilder->getInt32(i)};
116        Value * gep = mBuilder->CreateGEP(mInputAddressPtr, indices);
117        LoadInst * basisBit = mBuilder->CreateAlignedLoad(gep, iBuilder.getBitBlockWidth()/8, false, function->getParameter(i)->getName()->to_string());
118        mMarkerMap[function->getParameter(i)] = basisBit;
119        if (DumpTrace) {
120            iBuilder.genPrintRegister(function->getParameter(i)->getName()->to_string(), basisBit);
121        }
122    }
123     
124    //Generate the IR instructions for the function.
125   
126    mCarryManager->initialize(mMod, &mainScope);
127   
128    compileBlock(mainScope);
129   
130    mCarryManager->ensureCarriesStoredLocal();
131    mCarryManager->leaveScope();
132   
133   
134    mCarryManager->generateBlockNoIncrement();
135
136    if (DumpTrace) {
137        iBuilder.genPrintRegister("mBlockNo", mBuilder->CreateAlignedLoad(mBuilder->CreateBitCast(mCarryManager->getBlockNoPtr(), PointerType::get(mBitBlockType, 0)), iBuilder.getBitBlockWidth()/8, false));
138    }
139   
140    // Write the output values out
141    for (unsigned i = 0; i != function->getNumOfResults(); ++i) {
142        assert (function->getResult(i));
143        SetOutputValue(mMarkerMap[function->getResult(i)], i);
144    }
145
146    //Terminate the block
147    ReturnInst::Create(mMod->getContext(), mBuilder->GetInsertBlock());
148   
149    // Clean up
150    delete mCarryManager; mCarryManager = nullptr;
151    delete mBuilder; mBuilder = nullptr;
152    mMod = nullptr; // don't delete this. It's either owned by the ExecutionEngine or the calling function.
153
154    return mFunction;
155}
156
157inline void PabloCompiler::GenerateFunction(PabloFunction & function) {
158    mInputType = PointerType::get(StructType::get(mMod->getContext(), std::vector<Type *>(function.getNumOfParameters(), mBitBlockType)), 0);
159    Type * outputType = PointerType::get(StructType::get(mMod->getContext(), std::vector<Type *>(function.getNumOfResults(), mBitBlockType)), 0);
160    FunctionType * functionType = FunctionType::get(Type::getVoidTy(mMod->getContext()), std::vector<Type *>({mInputType, outputType}), false);
161
162
163    //Starts on process_block
164    SmallVector<AttributeSet, 3> Attrs;
165    Attrs.push_back(AttributeSet::get(mMod->getContext(), ~0U, std::vector<Attribute::AttrKind>({ Attribute::NoUnwind, Attribute::UWTable })));
166    Attrs.push_back(AttributeSet::get(mMod->getContext(), 1U, std::vector<Attribute::AttrKind>({ Attribute::ReadOnly, Attribute::NoCapture })));
167    Attrs.push_back(AttributeSet::get(mMod->getContext(), 2U, std::vector<Attribute::AttrKind>({ Attribute::ReadNone, Attribute::NoCapture })));
168    AttributeSet AttrSet = AttributeSet::get(mMod->getContext(), Attrs);
169
170    // Create the function that will be generated.
171    mFunction = Function::Create(functionType, GlobalValue::ExternalLinkage, function.getName()->value(), mMod);
172    mFunction->setCallingConv(CallingConv::C);
173    mFunction->setAttributes(AttrSet);
174
175    Function::arg_iterator args = mFunction->arg_begin();
176    mInputAddressPtr = args++;
177    mInputAddressPtr->setName("input");
178    mOutputAddressPtr = args++;
179    mOutputAddressPtr->setName("output");
180}
181
182inline void PabloCompiler::Examine(PabloFunction & function) {
183    mWhileDepth = 0;
184    mIfDepth = 0;
185    mMaxWhileDepth = 0;
186    Examine(function.getEntryBlock());
187    if (LLVM_UNLIKELY(mWhileDepth != 0 || mIfDepth != 0)) {
188        throw std::runtime_error("Malformed Pablo AST: Unbalanced If or While nesting depth!");
189    }
190}
191
192
193void PabloCompiler::Examine(PabloBlock & block) {
194    for (Statement * stmt : block) {
195        if (If * ifStatement = dyn_cast<If>(stmt)) {
196            Examine(ifStatement->getBody());
197        }
198        else if (While * whileStatement = dyn_cast<While>(stmt)) {
199            mMaxWhileDepth = std::max(mMaxWhileDepth, ++mWhileDepth);
200            Examine(whileStatement->getBody());
201            --mWhileDepth;
202        }
203    }
204}
205
206void PabloCompiler::compileBlock(PabloBlock & block) {
207    mPabloBlock = & block;
208    for (const Statement * statement : block) {
209        compileStatement(statement);
210    }
211    mPabloBlock = block.getParent();
212}
213
214void PabloCompiler::compileIf(const If * ifStatement) {       
215    //
216    //  The If-ElseZero stmt:
217    //  if <predicate:expr> then <body:stmt>* elsezero <defined:var>* endif
218    //  If the value of the predicate is nonzero, then determine the values of variables
219    //  <var>* by executing the given statements.  Otherwise, the value of the
220    //  variables are all zero.  Requirements: (a) no variable that is defined within
221    //  the body of the if may be accessed outside unless it is explicitly
222    //  listed in the variable list, (b) every variable in the defined list receives
223    //  a value within the body, and (c) the logical consequence of executing
224    //  the statements in the event that the predicate is zero is that the
225    //  values of all defined variables indeed work out to be 0.
226    //
227    //  Simple Implementation with Phi nodes:  a phi node in the if exit block
228    //  is inserted for each variable in the defined variable list.  It receives
229    //  a zero value from the ifentry block and the defined value from the if
230    //  body.
231    //
232
233    BasicBlock * ifEntryBlock = mBuilder->GetInsertBlock();
234    BasicBlock * ifBodyBlock = BasicBlock::Create(mMod->getContext(), "if.body", mFunction, 0);
235    BasicBlock * ifEndBlock = BasicBlock::Create(mMod->getContext(), "if.end", mFunction, 0);
236   
237    PabloBlock & ifBody = ifStatement -> getBody();
238   
239    Value * if_test_value = compileExpression(ifStatement->getCondition());
240   
241    mCarryManager->enterScope(&ifBody);
242    mBuilder->CreateCondBr(mCarryManager->generateBitBlockOrSummaryTest(if_test_value), ifBodyBlock, ifEndBlock);
243   
244    // Entry processing is complete, now handle the body of the if.
245    mBuilder->SetInsertPoint(ifBodyBlock);
246   
247    mCarryManager->initializeCarryDataAtIfEntry();
248    compileBlock(ifBody);
249    if (mCarryManager->blockHasCarries()) {
250        mCarryManager->generateCarryOutSummaryCodeIfNeeded();
251    }
252    BasicBlock * ifBodyFinalBlock = mBuilder->GetInsertBlock();
253    mCarryManager->ensureCarriesStoredLocal();
254    mBuilder->CreateBr(ifEndBlock);
255    //End Block
256    mBuilder->SetInsertPoint(ifEndBlock);
257    for (const PabloAST * node : ifStatement->getDefined()) {
258        const Assign * assign = cast<Assign>(node);
259        PHINode * phi = mBuilder->CreatePHI(mBitBlockType, 2, assign->getName()->value());
260        auto f = mMarkerMap.find(assign);
261        assert (f != mMarkerMap.end());
262        phi->addIncoming(iBuilder.allZeroes(), ifEntryBlock);
263        phi->addIncoming(f->second, ifBodyFinalBlock);
264        mMarkerMap[assign] = phi;
265    }
266    // Create the phi Node for the summary variable, if needed.
267    mCarryManager->buildCarryDataPhisAfterIfBody(ifEntryBlock, ifBodyFinalBlock);
268    mCarryManager->leaveScope();
269}
270
271void PabloCompiler::compileWhile(const While * whileStatement) {
272
273    PabloBlock & whileBody = whileStatement -> getBody();
274   
275    BasicBlock * whileEntryBlock = mBuilder->GetInsertBlock();
276    BasicBlock * whileBodyBlock = BasicBlock::Create(mMod->getContext(), "while.body", mFunction, 0);
277    BasicBlock * whileEndBlock = BasicBlock::Create(mMod->getContext(), "while.end", mFunction, 0);
278
279    mCarryManager->enterScope(&whileBody);
280    mCarryManager->ensureCarriesLoadedRecursive();
281
282    const auto & nextNodes = whileStatement->getVariants();
283    std::vector<PHINode *> nextPhis;
284    nextPhis.reserve(nextNodes.size());
285
286    // On entry to the while structure, proceed to execute the first iteration
287    // of the loop body unconditionally.   The while condition is tested at the end of
288    // the loop.
289
290    mBuilder->CreateBr(whileBodyBlock);
291    mBuilder->SetInsertPoint(whileBodyBlock);
292
293    //
294    // There are 3 sets of Phi nodes for the while loop.
295    // (1) Carry-ins: (a) incoming carry data first iterations, (b) zero thereafter
296    // (2) Carry-out accumulators: (a) zero first iteration, (b) |= carry-out of each iteration
297    // (3) Next nodes: (a) values set up before loop, (b) modified values calculated in loop.
298
299    mCarryManager->initializeCarryDataPhisAtWhileEntry(whileEntryBlock);
300
301    // for any Next nodes in the loop body, initialize to (a) pre-loop value.
302    for (const Next * n : nextNodes) {
303        PHINode * phi = mBuilder->CreatePHI(mBitBlockType, 2, n->getName()->value());
304        auto f = mMarkerMap.find(n->getInitial());
305        assert (f != mMarkerMap.end());
306        phi->addIncoming(f->second, whileEntryBlock);
307        mMarkerMap[n->getInitial()] = phi;
308        nextPhis.push_back(phi);
309    }
310
311    //
312    // Now compile the loop body proper.  Carry-out accumulated values
313    // and iterated values of Next nodes will be computed.
314    ++mWhileDepth;
315    compileBlock(whileBody);
316
317    BasicBlock * whileBodyFinalBlock = mBuilder->GetInsertBlock();
318
319    if (mCarryManager->blockHasCarries()) {
320        mCarryManager->generateCarryOutSummaryCodeIfNeeded();
321    }
322    mCarryManager->extendCarryDataPhisAtWhileBodyFinalBlock(whileBodyFinalBlock);
323
324    // Terminate the while loop body with a conditional branch back.
325    mBuilder->CreateCondBr(iBuilder.bitblock_any(compileExpression(whileStatement->getCondition())), whileBodyBlock, whileEndBlock);
326
327    // and for any Next nodes in the loop body
328    for (unsigned i = 0; i < nextNodes.size(); i++) {
329        const Next * n = nextNodes[i];
330        auto f = mMarkerMap.find(n->getExpr());
331        if (LLVM_UNLIKELY(f == mMarkerMap.end())) {
332            throw std::runtime_error("Next node expression was not compiled!");
333        }
334        nextPhis[i]->addIncoming(f->second, whileBodyFinalBlock);
335    }
336
337    mBuilder->SetInsertPoint(whileEndBlock);
338    --mWhileDepth;
339
340    mCarryManager->ensureCarriesStoredRecursive();
341    mCarryManager->leaveScope();
342}
343
344
345void PabloCompiler::compileStatement(const Statement * stmt) {
346    Value * expr = nullptr;
347    if (const Assign * assign = dyn_cast<const Assign>(stmt)) {
348        expr = compileExpression(assign->getExpression());
349    }
350    else if (const Next * next = dyn_cast<const Next>(stmt)) {
351        expr = compileExpression(next->getExpr());
352    }
353    else if (const If * ifStatement = dyn_cast<const If>(stmt)) {
354        compileIf(ifStatement);
355        return;
356    }
357    else if (const While * whileStatement = dyn_cast<const While>(stmt)) {
358        compileWhile(whileStatement);
359        return;
360    }
361    else if (const Call* call = dyn_cast<Call>(stmt)) {
362        //Call the callee once and store the result in the marker map.
363        if (mMarkerMap.count(call) != 0) {
364            return;
365        }
366
367        const Prototype * proto = call->getPrototype();
368        const String * callee = proto->getName();
369
370        Type * inputType = StructType::get(mMod->getContext(), std::vector<Type *>{proto->getNumOfParameters(), mBitBlockType});
371        Type * outputType = StructType::get(mMod->getContext(), std::vector<Type *>{proto->getNumOfResults(), mBitBlockType});
372        FunctionType * functionType = FunctionType::get(Type::getVoidTy(mMod->getContext()), std::vector<Type *>{PointerType::get(inputType, 0), PointerType::get(outputType, 0)}, false);
373
374        //Starts on process_block
375        SmallVector<AttributeSet, 3> Attrs;
376        Attrs.push_back(AttributeSet::get(mMod->getContext(), 1U, std::vector<Attribute::AttrKind>({ Attribute::ReadOnly, Attribute::NoCapture })));
377        Attrs.push_back(AttributeSet::get(mMod->getContext(), 2U, std::vector<Attribute::AttrKind>({ Attribute::ReadNone, Attribute::NoCapture })));
378        AttributeSet AttrSet = AttributeSet::get(mMod->getContext(), Attrs);
379
380        Function * externalFunction = cast<Function>(mMod->getOrInsertFunction(callee->value(), functionType, AttrSet));
381        if (LLVM_UNLIKELY(externalFunction == nullptr)) {
382            throw std::runtime_error("Could not create static method call for external function \"" + callee->to_string() + "\"");
383        }
384        externalFunction->setCallingConv(llvm::CallingConv::C);
385
386
387        AllocaInst * outputStruct = mBuilder->CreateAlloca(outputType);
388        mBuilder->CreateCall2(externalFunction, mInputAddressPtr, outputStruct);
389        Value * outputPtr = mBuilder->CreateGEP(outputStruct, std::vector<Value *>({ mBuilder->getInt32(0), mBuilder->getInt32(0) }));
390        expr = mBuilder->CreateAlignedLoad(outputPtr, iBuilder.getBitBlockWidth() / 8, false);
391    }
392    else if (const And * pablo_and = dyn_cast<And>(stmt)) {
393        expr = iBuilder.simd_and(compileExpression(pablo_and->getExpr1()), compileExpression(pablo_and->getExpr2()));
394    }
395    else if (const Or * pablo_or = dyn_cast<Or>(stmt)) {
396        expr = iBuilder.simd_or(compileExpression(pablo_or->getExpr1()), compileExpression(pablo_or->getExpr2()));
397    }
398    else if (const Xor * pablo_xor = dyn_cast<Xor>(stmt)) {
399        expr = iBuilder.simd_xor(compileExpression(pablo_xor->getExpr1()), compileExpression(pablo_xor->getExpr2()));
400    }
401    else if (const Sel * sel = dyn_cast<Sel>(stmt)) {
402        Value* ifMask = compileExpression(sel->getCondition());
403        Value* ifTrue = iBuilder.simd_and(ifMask, compileExpression(sel->getTrueExpr()));
404        Value* ifFalse = iBuilder.simd_and(iBuilder.simd_not(ifMask), compileExpression(sel->getFalseExpr()));
405        expr = iBuilder.simd_or(ifTrue, ifFalse);
406    }
407    else if (const Not * pablo_not = dyn_cast<Not>(stmt)) {
408        expr = iBuilder.simd_not(compileExpression(pablo_not->getExpr()));
409    }
410    else if (const Advance * adv = dyn_cast<Advance>(stmt)) {
411        Value* strm_value = compileExpression(adv->getExpr());
412        int shift = adv->getAdvanceAmount();
413        unsigned advance_index = adv->getLocalAdvanceIndex();
414        expr = mCarryManager->advanceCarryInCarryOut(advance_index, shift, strm_value);
415    }
416    else if (const Mod64Advance * adv = dyn_cast<Mod64Advance>(stmt)) {
417        Value* strm_value = compileExpression(adv->getExpr());
418        int shift = adv->getAdvanceAmount();
419        expr = iBuilder.simd_slli(64, strm_value, shift);
420    }
421    else if (const MatchStar * mstar = dyn_cast<MatchStar>(stmt)) {
422        Value * marker = compileExpression(mstar->getMarker());
423        Value * cc = compileExpression(mstar->getCharClass());
424        Value * marker_and_cc = iBuilder.simd_and(marker, cc);
425        unsigned carry_index = mstar->getLocalCarryIndex();
426        Value * sum = mCarryManager->addCarryInCarryOut(carry_index, marker_and_cc, cc);
427        expr = iBuilder.simd_or(iBuilder.simd_xor(sum, cc), marker);
428    }
429    else if (const Mod64MatchStar * mstar = dyn_cast<Mod64MatchStar>(stmt)) {
430        Value * marker = compileExpression(mstar->getMarker());
431        Value * cc = compileExpression(mstar->getCharClass());
432        Value * marker_and_cc = iBuilder.simd_and(marker, cc);
433        Value * sum = iBuilder.simd_add(64, marker_and_cc, cc);
434        expr = iBuilder.simd_or(iBuilder.simd_xor(sum, cc), marker);
435    }
436    else if (const ScanThru * sthru = dyn_cast<ScanThru>(stmt)) {
437        Value * marker_expr = compileExpression(sthru->getScanFrom());
438        Value * cc_expr = compileExpression(sthru->getScanThru());
439        unsigned carry_index = sthru->getLocalCarryIndex();
440        Value * sum = mCarryManager->addCarryInCarryOut(carry_index, marker_expr, cc_expr);
441        expr = iBuilder.simd_and(sum, iBuilder.simd_not(cc_expr));
442    }
443    else if (const Mod64ScanThru * sthru = dyn_cast<Mod64ScanThru>(stmt)) {
444        Value * marker_expr = compileExpression(sthru->getScanFrom());
445        Value * cc_expr = compileExpression(sthru->getScanThru());
446        Value * sum = iBuilder.simd_add(64, marker_expr, cc_expr);
447        expr = iBuilder.simd_and(sum, iBuilder.simd_not(cc_expr));
448    }
449    else if (const Count * c = dyn_cast<Count>(stmt)) {
450        unsigned count_index = c->getGlobalCountIndex();
451        Value * to_count = compileExpression(c->getExpr());
452        expr = mCarryManager->popCount(to_count, count_index);
453    }
454    else {
455        llvm::raw_os_ostream cerr(std::cerr);
456        PabloPrinter::print(stmt, cerr);
457        throw std::runtime_error("Unrecognized Pablo Statement! can't compile.");
458    }
459    mMarkerMap[stmt] = expr;
460    if (DumpTrace) {
461        iBuilder.genPrintRegister(stmt->getName()->to_string(), expr);
462    }
463   
464}
465
466Value * PabloCompiler::compileExpression(const PabloAST * expr) {
467    if (isa<Ones>(expr)) {
468        return iBuilder.allOnes();
469    }
470    else if (isa<Zeroes>(expr)) {
471        return iBuilder.allZeroes();
472    }
473    auto f = mMarkerMap.find(expr);
474    if (LLVM_UNLIKELY(f == mMarkerMap.end())) {
475        std::string o;
476        llvm::raw_string_ostream str(o);
477        str << "\"";
478        PabloPrinter::print(expr, str);
479        str << "\" was used before definition!";
480        throw std::runtime_error(str.str());
481    }
482    return f->second;
483}
484
485void PabloCompiler::SetOutputValue(Value * marker, const unsigned index) {
486    if (LLVM_UNLIKELY(marker == nullptr)) {
487        throw std::runtime_error("Cannot set result " + std::to_string(index) + " to Null");
488    }
489    if (LLVM_UNLIKELY(marker->getType()->isPointerTy())) {
490        marker = mBuilder->CreateAlignedLoad(marker, iBuilder.getBitBlockWidth()/8, false);
491    }
492    Value* indices[] = {mBuilder->getInt64(0), mBuilder->getInt32(index)};
493    Value* gep = mBuilder->CreateGEP(mOutputAddressPtr, indices);
494    if (marker->getType() != mBitBlockType) {
495        marker = mBuilder->CreateBitCast(marker, mBitBlockType);
496    }
497    mBuilder->CreateAlignedStore(marker, gep, iBuilder.getBitBlockWidth()/8, false);
498}
499
500}
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