source: icGREP/icgrep-devel/icgrep/kernels/kernel.cpp @ 5142

Last change on this file since 5142 was 5142, checked in by cameron, 3 years ago

ExternalFileBuffer?, SingleBlockBuffer? fixes

File size: 19.8 KB
Line 
1/*
2 *  Copyright (c) 2016 International Characters.
3 *  This software is licensed to the public under the Open Software License 3.0.
4 */
5
6#include "kernel.h"
7#include <llvm/IR/Module.h>
8#include <llvm/IR/Type.h>
9#include <llvm/IR/Value.h>
10#include <llvm/Support/raw_ostream.h>
11#include <llvm/IR/TypeBuilder.h>
12#include <toolchain.h>
13
14using namespace llvm;
15using namespace kernel;
16
17KernelBuilder::KernelBuilder(IDISA::IDISA_Builder * builder,
18                                 std::string kernelName,
19                                 std::vector<StreamSetBinding> stream_inputs,
20                                 std::vector<StreamSetBinding> stream_outputs,
21                                 std::vector<ScalarBinding> scalar_parameters,
22                                 std::vector<ScalarBinding> scalar_outputs,
23                                 std::vector<ScalarBinding> internal_scalars) :
24    KernelInterface(builder, kernelName, stream_inputs, stream_outputs, scalar_parameters, scalar_outputs, internal_scalars) {}
25
26void KernelBuilder::addScalar(Type * t, std::string scalarName) {
27    if (LLVM_UNLIKELY(mKernelStateType != nullptr)) {
28        throw std::runtime_error("Illegal addition of kernel field after kernel state finalized: " + scalarName);
29    }
30    unsigned index = mKernelFields.size();
31    mKernelFields.push_back(t);
32    mInternalStateNameMap.emplace(scalarName, index);
33}
34
35void KernelBuilder::prepareKernel() {
36    unsigned blockSize = iBuilder->getBitBlockWidth();
37    if (mStreamSetInputs.size() != mStreamSetInputBuffers.size()) {
38        throw std::runtime_error("Kernel preparation: Incorrect number of input buffers");
39    }
40    if (mStreamSetOutputs.size() != mStreamSetOutputBuffers.size()) {
41        throw std::runtime_error("Kernel preparation: Incorrect number of input buffers");
42    }
43    addScalar(iBuilder->getSizeTy(), blockNoScalar);
44    int streamSetNo = 0;
45    for (unsigned i = 0; i < mStreamSetInputs.size(); i++) {
46        size_t bufferSize = mStreamSetInputBuffers[i]->getBufferSize() * blockSize;
47        if (!(mStreamSetInputBuffers[i]->getBufferStreamSetType() == mStreamSetInputs[i].ssType)) {
48             throw std::runtime_error("Kernel preparation: Incorrect input buffer type");
49        }
50        if ((bufferSize > 0) && (bufferSize < codegen::SegmentSize + (blockSize + mLookAheadPositions - 1)/blockSize)) {
51             errs() << "buffer size = " << mStreamSetInputBuffers[i]->getBufferSize() << "\n";
52             throw std::runtime_error("Kernel preparation: Buffer size too small.");
53        }
54
55        mScalarInputs.push_back(ScalarBinding{mStreamSetInputBuffers[i]->getStreamSetStructPointerType(), mStreamSetInputs[i].ssName + basePtrSuffix});
56        mStreamSetNameMap.emplace(mStreamSetInputs[i].ssName, streamSetNo);
57        streamSetNo++;
58    }
59    for (unsigned i = 0; i < mStreamSetOutputs.size(); i++) {
60        if (!(mStreamSetOutputBuffers[i]->getBufferStreamSetType() == mStreamSetOutputs[i].ssType)) {
61             throw std::runtime_error("Kernel preparation: Incorrect input buffer type");
62        }
63        mScalarInputs.push_back(ScalarBinding{mStreamSetOutputBuffers[i]->getStreamSetStructPointerType(), mStreamSetOutputs[i].ssName + basePtrSuffix});
64        mStreamSetNameMap.emplace(mStreamSetOutputs[i].ssName, streamSetNo);
65        streamSetNo++;
66    }
67    for (auto binding : mScalarInputs) {
68        addScalar(binding.scalarType, binding.scalarName);
69    }
70    for (auto binding : mScalarOutputs) {
71        addScalar(binding.scalarType, binding.scalarName);
72    }
73    for (auto binding : mInternalScalars) {
74        addScalar(binding.scalarType, binding.scalarName);
75    }
76    mKernelStateType = StructType::create(getGlobalContext(), mKernelFields, mKernelName);
77}
78
79std::unique_ptr<Module> KernelBuilder::createKernelModule(std::vector<StreamSetBuffer *> input_buffers, std::vector<StreamSetBuffer *> output_buffers) {
80    Module * saveModule = iBuilder->getModule();
81    IDISA::IDISA_Builder::InsertPoint savePoint = iBuilder->saveIP();
82    std::unique_ptr<Module> theModule = make_unique<Module>(mKernelName + "_" + iBuilder->getBitBlockTypeName(), getGlobalContext());
83    Module * m = theModule.get();
84    iBuilder->setModule(m);
85    generateKernel(input_buffers, output_buffers);
86    iBuilder->setModule(saveModule);
87    iBuilder->restoreIP(savePoint);
88    return theModule;
89}
90
91void KernelBuilder::generateKernel(std::vector<StreamSetBuffer *> input_buffers, std::vector<StreamSetBuffer*> output_buffers) {
92    IDISA::IDISA_Builder::InsertPoint savePoint = iBuilder->saveIP();
93    Module * m = iBuilder->getModule();
94    mStreamSetInputBuffers = input_buffers;
95    mStreamSetOutputBuffers = output_buffers;
96    prepareKernel();  // possibly overriden by the KernelBuilder subtype
97    KernelInterface::addKernelDeclarations(m);
98    generateDoBlockMethod();     // must be implemented by the KernelBuilder subtype
99    generateFinalBlockMethod();  // possibly overriden by the KernelBuilder subtype
100    generateDoSegmentMethod();
101
102    // Implement the accumulator get functions
103    for (auto binding : mScalarOutputs) {
104        auto fnName = mKernelName + accumulator_infix + binding.scalarName;
105        Function * accumFn = m->getFunction(fnName);
106        iBuilder->SetInsertPoint(BasicBlock::Create(iBuilder->getContext(), "get_" + binding.scalarName, accumFn, 0));
107        Value * self = &*(accumFn->arg_begin());
108        Value * ptr = iBuilder->CreateGEP(self, {iBuilder->getInt32(0), getScalarIndex(binding.scalarName)});
109        Value * retVal = iBuilder->CreateLoad(ptr);
110        iBuilder->CreateRet(retVal);
111    }
112    // Implement the initializer function
113    Function * initFunction = m->getFunction(mKernelName + init_suffix);
114    iBuilder->SetInsertPoint(BasicBlock::Create(iBuilder->getContext(), "Init_entry", initFunction, 0));
115   
116    Function::arg_iterator args = initFunction->arg_begin();
117    Value * self = &*(args++);
118    iBuilder->CreateStore(Constant::getNullValue(mKernelStateType), self);
119    for (auto binding : mScalarInputs) {
120        Value * parm = &*(args++);
121        Value * ptr = iBuilder->CreateGEP(self, {iBuilder->getInt32(0), getScalarIndex(binding.scalarName)});
122        iBuilder->CreateStore(parm, ptr);
123    }
124    iBuilder->CreateRetVoid();
125    iBuilder->restoreIP(savePoint);
126}
127
128//  The default finalBlock method simply dispatches to the doBlock routine.
129void KernelBuilder::generateFinalBlockMethod() {
130    IDISA::IDISA_Builder::InsertPoint savePoint = iBuilder->saveIP();
131    Module * m = iBuilder->getModule();
132    Function * doBlockFunction = m->getFunction(mKernelName + doBlock_suffix);
133    Function * finalBlockFunction = m->getFunction(mKernelName + finalBlock_suffix);
134    iBuilder->SetInsertPoint(BasicBlock::Create(iBuilder->getContext(), "fb_entry", finalBlockFunction, 0));
135    // Final Block arguments: self, remaining, then the standard DoBlock args.
136    Function::arg_iterator args = finalBlockFunction->arg_begin();
137    Value * self = &*(args++);
138    /* Skip "remaining" arg */ args++;
139    std::vector<Value *> doBlockArgs = {self};
140    while (args != finalBlockFunction->arg_end()){
141        doBlockArgs.push_back(&*args++);
142    }
143    iBuilder->CreateCall(doBlockFunction, doBlockArgs);
144    iBuilder->CreateRetVoid();
145    iBuilder->restoreIP(savePoint);
146}
147
148//  The default doSegment method simply dispatches to the doBlock routine.
149void KernelBuilder::generateDoSegmentMethod() {
150    IDISA::IDISA_Builder::InsertPoint savePoint = iBuilder->saveIP();
151    Module * m = iBuilder->getModule();
152    Function * doBlockFunction = m->getFunction(mKernelName + doBlock_suffix);
153    Function * doSegmentFunction = m->getFunction(mKernelName + doSegment_suffix);
154    iBuilder->SetInsertPoint(BasicBlock::Create(iBuilder->getContext(), "entry", doSegmentFunction, 0));
155    BasicBlock * entryBlock = iBuilder->GetInsertBlock();
156    BasicBlock * blockLoop = BasicBlock::Create(iBuilder->getContext(), "blockLoop", doSegmentFunction, 0);
157    BasicBlock * blocksDone = BasicBlock::Create(iBuilder->getContext(), "blocksDone", doSegmentFunction, 0);
158
159   
160    Function::arg_iterator args = doSegmentFunction->arg_begin();
161    Value * self = &*(args++);
162    Value * blocksToDo = &*(args);
163   
164    iBuilder->CreateBr(blockLoop);
165   
166    iBuilder->SetInsertPoint(blockLoop);
167    PHINode * blocksRemaining = iBuilder->CreatePHI(iBuilder->getSizeTy(), 2, "blocksRemaining");
168    blocksRemaining->addIncoming(blocksToDo, entryBlock);
169   
170    Value * blockNo = getScalarField(self, blockNoScalar);
171   
172    iBuilder->CreateCall(doBlockFunction, {self});
173    setScalarField(self, blockNoScalar, iBuilder->CreateAdd(blockNo, ConstantInt::get(iBuilder->getSizeTy(), iBuilder->getStride() / iBuilder->getBitBlockWidth())));
174    blocksToDo = iBuilder->CreateSub(blocksRemaining, ConstantInt::get(iBuilder->getSizeTy(), 1));
175    blocksRemaining->addIncoming(blocksToDo, blockLoop);
176    Value * notDone = iBuilder->CreateICmpUGT(blocksToDo, ConstantInt::get(iBuilder->getSizeTy(), 0));
177    iBuilder->CreateCondBr(notDone, blockLoop, blocksDone);
178   
179    iBuilder->SetInsertPoint(blocksDone);
180    iBuilder->CreateRetVoid();
181    iBuilder->restoreIP(savePoint);
182}
183
184Value * KernelBuilder::getScalarIndex(std::string fieldName) {
185    const auto f = mInternalStateNameMap.find(fieldName);
186    if (LLVM_UNLIKELY(f == mInternalStateNameMap.end())) {
187        throw std::runtime_error("Kernel does not contain internal state: " + fieldName);
188    }
189    return iBuilder->getInt32(f->second);
190}
191
192
193
194Value * KernelBuilder::getScalarField(Value * self, std::string fieldName) {
195    Value * ptr = iBuilder->CreateGEP(self, {iBuilder->getInt32(0), getScalarIndex(fieldName)});
196    return iBuilder->CreateLoad(ptr);
197}
198
199void KernelBuilder::setScalarField(Value * self, std::string fieldName, Value * newFieldVal) {
200    Value * ptr = iBuilder->CreateGEP(self, {iBuilder->getInt32(0), getScalarIndex(fieldName)});
201    iBuilder->CreateStore(newFieldVal, ptr);
202}
203
204
205Value * KernelBuilder::getParameter(Function * f, std::string paramName) {
206    for (Function::arg_iterator argIter = f->arg_begin(), end = f->arg_end(); argIter != end; argIter++) {
207        Value * arg = &*argIter;
208        if (arg->getName() == paramName) return arg;
209    }
210    throw std::runtime_error("Method does not have parameter: " + paramName);
211}
212
213unsigned KernelBuilder::getStreamSetIndex(std::string ssName) {
214    const auto f = mStreamSetNameMap.find(ssName);
215    if (LLVM_UNLIKELY(f == mStreamSetNameMap.end())) {
216        throw std::runtime_error("Kernel does not contain stream set: " + ssName);
217    }
218    return f->second;
219}
220
221size_t KernelBuilder::getStreamSetBufferSize(Value * self, std::string ssName) {
222    unsigned ssIndex = getStreamSetIndex(ssName);
223    if (ssIndex < mStreamSetInputs.size()) {
224        return mStreamSetInputBuffers[ssIndex]->getBufferSize();
225    }
226    else {
227        return mStreamSetOutputBuffers[ssIndex - mStreamSetInputs.size()]->getBufferSize();
228    }
229}
230
231Value * KernelBuilder::getStreamSetBasePtr(Value * self, std::string ssName) {
232    return getScalarField(self, ssName + basePtrSuffix);
233}
234
235Value * KernelBuilder::getStreamSetBlockPtr(Value * self, std::string ssName, Value * blockNo) {
236    Value * basePtr = getStreamSetBasePtr(self, ssName);
237    unsigned ssIndex = getStreamSetIndex(ssName);
238    if (ssIndex < mStreamSetInputs.size()) {
239        return mStreamSetInputBuffers[ssIndex]->getStreamSetBlockPointer(basePtr, blockNo);
240    }
241    else {
242        return mStreamSetOutputBuffers[ssIndex - mStreamSetInputs.size()]->getStreamSetBlockPointer(basePtr, blockNo);
243    }
244}
245
246Value * KernelBuilder::createInstance(std::vector<Value *> args) {
247    Value * kernelInstance = iBuilder->CreateAlloca(mKernelStateType);
248    Module * m = iBuilder->getModule();
249    std::vector<Value *> init_args = {kernelInstance};
250    for (auto a : args) {
251        init_args.push_back(a);
252    }
253    for (auto b : mStreamSetInputBuffers) { 
254        init_args.push_back(b->getStreamSetStructPtr());
255    }
256    for (auto b : mStreamSetOutputBuffers) { 
257        init_args.push_back(b->getStreamSetStructPtr());
258    }
259    std::string initFnName = mKernelName + init_suffix;
260    Function * initMethod = m->getFunction(initFnName);
261    if (!initMethod) {
262        throw std::runtime_error("Cannot find " + initFnName);
263    }
264    iBuilder->CreateCall(initMethod, init_args);
265    return kernelInstance;
266}
267
268Function * KernelBuilder::generateThreadFunction(std::string name){
269    Module * m = iBuilder->getModule();
270    Type * const voidTy = Type::getVoidTy(m->getContext());
271    Type * const voidPtrTy = TypeBuilder<void *, false>::get(m->getContext());
272    Type * const int8PtrTy = iBuilder->getInt8PtrTy();
273    Type * const int1ty = iBuilder->getInt1Ty();
274
275    Function * const threadFunc = cast<Function>(m->getOrInsertFunction(name, voidTy, int8PtrTy, nullptr));
276    threadFunc->setCallingConv(CallingConv::C);
277    Function::arg_iterator args = threadFunc->arg_begin();
278
279    Value * const arg = &*(args++);
280    arg->setName("args");
281
282    iBuilder->SetInsertPoint(BasicBlock::Create(iBuilder->getContext(), "entry", threadFunc,0));
283
284    Value * self = iBuilder->CreateBitCast(arg, PointerType::get(mKernelStateType, 0));
285
286    std::vector<Value *> inbufProducerPtrs;
287    std::vector<Value *> inbufConsumerPtrs;
288    std::vector<Value *> outbufProducerPtrs;
289    std::vector<Value *> outbufConsumerPtrs;   
290    std::vector<Value *> endSignalPtrs;
291
292    for (unsigned i = 0; i < mStreamSetInputs.size(); i++) {
293        Value * basePtr = getStreamSetBasePtr(self, mStreamSetInputs[i].ssName);
294        inbufProducerPtrs.push_back(mStreamSetInputBuffers[i]->getProducerPosPtr(basePtr));
295        inbufConsumerPtrs.push_back(mStreamSetInputBuffers[i]->getComsumerPosPtr(basePtr));
296        endSignalPtrs.push_back(mStreamSetInputBuffers[i]->hasEndOfInputPtr(basePtr));
297    }
298    for (unsigned i = 0; i < mStreamSetOutputs.size(); i++) {
299        Value * basePtr = getStreamSetBasePtr(self, mStreamSetOutputs[i].ssName);
300        outbufProducerPtrs.push_back(mStreamSetOutputBuffers[i]->getProducerPosPtr(basePtr));
301        outbufConsumerPtrs.push_back(mStreamSetOutputBuffers[i]->getComsumerPosPtr(basePtr));
302    }
303
304    const unsigned segmentBlocks = codegen::SegmentSize;
305    const unsigned bufferSegments = codegen::BufferSegments;
306    const unsigned segmentSize = segmentBlocks * iBuilder->getBitBlockWidth();
307    Type * const size_ty = iBuilder->getSizeTy();
308
309    Value * segSize = ConstantInt::get(size_ty, segmentSize);
310    Value * bufferSize = ConstantInt::get(size_ty, segmentSize * (bufferSegments - 1));
311    Value * segBlocks = ConstantInt::get(size_ty, segmentBlocks);
312   
313    BasicBlock * outputCheckBlock = BasicBlock::Create(iBuilder->getContext(), "outputCheck", threadFunc, 0);
314    BasicBlock * inputCheckBlock = BasicBlock::Create(iBuilder->getContext(), "inputCheck", threadFunc, 0);
315   
316    BasicBlock * endSignalCheckBlock = BasicBlock::Create(iBuilder->getContext(), "endSignalCheck", threadFunc, 0);
317    BasicBlock * doSegmentBlock = BasicBlock::Create(iBuilder->getContext(), "doSegment", threadFunc, 0);
318    BasicBlock * endBlock = BasicBlock::Create(iBuilder->getContext(), "end", threadFunc, 0);
319    BasicBlock * doFinalSegBlock = BasicBlock::Create(iBuilder->getContext(), "doFinalSeg", threadFunc, 0);
320    BasicBlock * doFinalBlock = BasicBlock::Create(iBuilder->getContext(), "doFinal", threadFunc, 0);
321
322    iBuilder->CreateBr(outputCheckBlock);
323
324    iBuilder->SetInsertPoint(outputCheckBlock);
325
326    Value * waitCondTest = ConstantInt::get(int1ty, 1);   
327    for (unsigned i = 0; i < outbufProducerPtrs.size(); i++) {
328        LoadInst * producerPos = iBuilder->CreateAlignedLoad(outbufProducerPtrs[i], 8);
329        producerPos->setOrdering(Acquire);
330        // iBuilder->CallPrintInt(name + ":output producerPos", producerPos);
331        LoadInst * consumerPos = iBuilder->CreateAlignedLoad(outbufConsumerPtrs[i], 8);
332        consumerPos->setOrdering(Acquire);
333        // iBuilder->CallPrintInt(name + ":output consumerPos", consumerPos);
334        waitCondTest = iBuilder->CreateAnd(waitCondTest, iBuilder->CreateICmpULE(producerPos, iBuilder->CreateAdd(consumerPos, bufferSize)));
335    }
336   
337    iBuilder->CreateCondBr(waitCondTest, inputCheckBlock, outputCheckBlock); 
338
339    iBuilder->SetInsertPoint(inputCheckBlock); 
340
341    waitCondTest = ConstantInt::get(int1ty, 1); 
342    for (unsigned i = 0; i < inbufProducerPtrs.size(); i++) {
343        LoadInst * producerPos = iBuilder->CreateAlignedLoad(inbufProducerPtrs[i], 8);
344        producerPos->setOrdering(Acquire);
345        // iBuilder->CallPrintInt(name + ":input producerPos", producerPos);
346        LoadInst * consumerPos = iBuilder->CreateAlignedLoad(inbufConsumerPtrs[i], 8);
347        consumerPos->setOrdering(Acquire);
348        // iBuilder->CallPrintInt(name + ":input consumerPos", consumerPos);
349        waitCondTest = iBuilder->CreateAnd(waitCondTest, iBuilder->CreateICmpULE(iBuilder->CreateAdd(consumerPos, segSize), producerPos));
350    }
351
352    iBuilder->CreateCondBr(waitCondTest, doSegmentBlock, endSignalCheckBlock);
353   
354    iBuilder->SetInsertPoint(endSignalCheckBlock);
355   
356    LoadInst * endSignal = iBuilder->CreateAlignedLoad(endSignalPtrs[0], 8);
357    // iBuilder->CallPrintInt(name + ":endSignal", endSignal);
358    endSignal->setOrdering(Acquire);
359    for (unsigned i = 1; i < endSignalPtrs.size(); i++){
360        LoadInst * endSignal_next = iBuilder->CreateAlignedLoad(endSignalPtrs[i], 8);
361        endSignal_next->setOrdering(Acquire);
362        iBuilder->CreateAnd(endSignal, endSignal_next);
363    }
364       
365    iBuilder->CreateCondBr(iBuilder->CreateICmpEQ(endSignal, ConstantInt::get(iBuilder->getInt8Ty(), 1)), endBlock, inputCheckBlock);
366   
367    iBuilder->SetInsertPoint(doSegmentBlock);
368 
369    createDoSegmentCall(self, segBlocks);
370
371    for (unsigned i = 0; i < inbufConsumerPtrs.size(); i++) {
372        Value * consumerPos = iBuilder->CreateAdd(iBuilder->CreateLoad(inbufConsumerPtrs[i]), segSize);
373        iBuilder->CreateAlignedStore(consumerPos, inbufConsumerPtrs[i], 8)->setOrdering(Release);
374    }
375    for (unsigned i = 0; i < outbufProducerPtrs.size(); i++) {
376        Value * producerPos = iBuilder->CreateAdd(iBuilder->CreateLoad(outbufProducerPtrs[i]), segSize);
377        iBuilder->CreateAlignedStore(producerPos, outbufProducerPtrs[i], 8)->setOrdering(Release);
378    }
379   
380    iBuilder->CreateBr(outputCheckBlock);
381     
382    iBuilder->SetInsertPoint(endBlock);
383    LoadInst * producerPos = iBuilder->CreateLoad(inbufProducerPtrs[0]);
384    LoadInst * consumerPos = iBuilder->CreateLoad(inbufConsumerPtrs[0]);
385    Value * remainingBytes = iBuilder->CreateSub(producerPos, consumerPos);
386    Value * blockSize = ConstantInt::get(size_ty, iBuilder->getBitBlockWidth());
387    Value * blocks = iBuilder->CreateUDiv(remainingBytes, blockSize);
388    Value * finalBlockRemainingBytes = iBuilder->CreateURem(remainingBytes, blockSize);
389
390    iBuilder->CreateCondBr(iBuilder->CreateICmpEQ(blocks, ConstantInt::get(size_ty, 0)), doFinalBlock, doFinalSegBlock);
391
392    iBuilder->SetInsertPoint(doFinalSegBlock);
393
394    createDoSegmentCall(self, blocks);
395
396    iBuilder->CreateBr(doFinalBlock);
397
398    iBuilder->SetInsertPoint(doFinalBlock);
399
400    createFinalBlockCall(self, finalBlockRemainingBytes);
401
402    for (unsigned i = 0; i < inbufConsumerPtrs.size(); i++) {
403        Value * consumerPos = iBuilder->CreateAdd(iBuilder->CreateLoad(inbufConsumerPtrs[i]), remainingBytes);
404        iBuilder->CreateAlignedStore(consumerPos, inbufConsumerPtrs[i], 8)->setOrdering(Release);
405    }
406    for (unsigned i = 0; i < outbufProducerPtrs.size(); i++) {
407        Value * producerPos = iBuilder->CreateAdd(iBuilder->CreateLoad(outbufProducerPtrs[i]), remainingBytes);
408        iBuilder->CreateAlignedStore(producerPos, outbufProducerPtrs[i], 8)->setOrdering(Release);
409    }
410
411    for (unsigned i = 0; i < mStreamSetOutputs.size(); i++) {
412        Value * basePtr = getStreamSetBasePtr(self, mStreamSetOutputs[i].ssName);
413        mStreamSetOutputBuffers[i]->setEndOfInput(basePtr);
414    }
415
416    Value * nullVal = Constant::getNullValue(voidPtrTy);
417    Function * pthreadExitFunc = m->getFunction("pthread_exit");
418    CallInst * exitThread = iBuilder->CreateCall(pthreadExitFunc, {nullVal}); 
419    exitThread->setDoesNotReturn();
420    iBuilder->CreateRetVoid();
421
422    return threadFunc;
423
424}
425
426
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