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a6e928bdd70e4ea04ca888ccd24a4385817541d7
Raptor/src/PIM/Compiler/PimCodeGen.cpp
NiccoloN a6e928bdd7 add PIM accelerator
2026-02-24 15:09:18 +01:00

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#include "mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h"
#include "mlir/Dialect/Bufferization/Transforms/BufferViewFlowAnalysis.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/IR/Attributes.h"
#include "mlir/IR/BuiltinTypes.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstddef>
#include "Conversion/ONNXToSpatial/ONNXToSpatialCommon.hpp"
#include "Conversion/SpatialToPIM/SpatialToPIMCommon.hpp"
#include "Dialect/Spatial/SpatialOps.hpp"
#include "src/Accelerators/PIM/Compiler/PimCodeGen.hpp"
#include "src/Accelerators/PIM/Compiler/PimCompilerOptions.hpp"
#include "src/Accelerators/PIM/Compiler/PimCompilerUtils.hpp"
#include "src/Accelerators/PIM/Dialect/PIM/PimOps.hpp"
#include "src/Accelerators/PIM/Pass/PimPasses.hpp"
#include "src/Compiler/CompilerPasses.hpp"
#include "src/Compiler/CompilerUtils.hpp"
namespace onnx_mlir {
MemEntry* PimMemory::gatherMemEntry(Value value) {
auto type = cast<ShapedType>(value.getType());
assert("Only static shape is supported" && type.hasStaticShape());
size_t allocSize = type.getNumElements() * type.getElementType().getIntOrFloatBitWidth() / 8;
MemEntry memEntry = {0, allocSize};
return &memEntries.emplace_back(memEntry, value).first;
}
void PimMemory::allocateMemoryForValue(Value value, MemEntry& memEntry) {
memEntry.address = firstAvailableAddress;
firstAvailableAddress += memEntry.size;
// Alignment
if (size_t remainder = firstAvailableAddress % minAlignment)
firstAvailableAddress += minAlignment - remainder;
globalMemEntriesMap[value] = memEntry;
}
void PimMemory::allocateHost(ModuleOp moduleOp, func::FuncOp funcOp) {
// More than one SSA value per single global constant:
// Cannot call gatherMemEntry for each of them, otherwise memory will be allocated multiple times
// Thus, call gatherMemEntry only for the first SSA value and assign the same memEntry to all others
llvm::SmallDenseMap<memref::GlobalOp, MemEntry*, 8> globalConstants;
funcOp.walk([&](memref::GetGlobalOp getGlobalOp) {
if (!getGlobalOp->hasAttr("weightAlways")) {
auto globalMemrefOp = moduleOp.lookupSymbol<memref::GlobalOp>(getGlobalOp.getName());
auto iter = globalConstants.find(globalMemrefOp);
if (iter == globalConstants.end())
globalConstants[globalMemrefOp] = gatherMemEntry(getGlobalOp);
else {
MemEntry memEntry = *iter->second;
globalMemEntriesMap[getGlobalOp] = memEntry;
}
}
});
for (Value arg : funcOp.getArguments())
gatherMemEntry(arg);
allocateCore(funcOp);
}
void PimMemory::allocateCore(Operation* op) {
op->walk([&](memref::AllocOp allocOp) { gatherMemEntry(allocOp); });
llvm::sort(memEntries, [](auto a, auto b) -> bool { return a.first.size > b.first.size; });
for (auto& [memEntry, value] : memEntries)
allocateMemoryForValue(value, memEntry);
}
MemEntry PimMemory::getMemEntry(Value value) const {
auto iter = globalMemEntriesMap.find(value);
assert("Missing memEntry for value" && iter != globalMemEntriesMap.end());
return iter->second;
}
PimMemory PimAcceleratorMemory::getOrCreateDeviceMem(size_t id) {
return deviceMem.try_emplace(id, memEntriesMap).first->second;
}
size_t PimAcceleratorMemory::getValueAddress(Value value) const {
while (true) {
auto definingOp = value.getDefiningOp();
if (!definingOp)
break;
if (auto dpsDefiningOp = dyn_cast<DestinationStyleOpInterface>(definingOp)) {
OpOperand* tiedOperand = dpsDefiningOp.getTiedOpOperand(cast<OpResult>(value));
if (!tiedOperand)
break;
value = tiedOperand->get();
}
else if (auto subviewDefiningOp = dyn_cast<memref::SubViewOp>(definingOp)) {
auto source = subviewDefiningOp.getSource();
auto srcShape = source.getType().getShape();
auto subviewOffsets = subviewDefiningOp.getStaticOffsets();
auto subviewSizes = subviewDefiningOp.getStaticSizes();
auto subviewStrides = subviewDefiningOp.getStaticStrides();
assert(isMemoryContiguous(srcShape, subviewOffsets, subviewSizes, subviewStrides));
value = source;
}
else
break;
}
return memEntriesMap.at(value).address;
}
llvm::json::Object PimCodeGen::createSetImmediate(size_t targetRegister, size_t immediate) {
llvm::json::Object returnValue;
returnValue["op"] = "sldi";
returnValue["rd"] = targetRegister;
returnValue["imm"] = immediate;
return returnValue;
}
llvm::json::Object PimCodeGen::createEmptyOffset() {
llvm::json::Object returnValue;
returnValue["offset_select"] = 0;
returnValue["offset_value"] = 0;
return returnValue;
}
void PimCodeGen::genSetRegisterImmediateUnsigned(size_t registerNumber, size_t immediate) {
llvm::json::Object setRegisterJson = createSetImmediate(registerNumber, immediate);
coreFileStream << llvm::json::Value(std::move(setRegisterJson)) << ',';
}
void PimCodeGen::createRd(size_t rdAddress, size_t rdOffset) {
// rd on register 0
genSetRegisterImmediateUnsigned(0, rdAddress + rdOffset);
}
void PimCodeGen::createRdRs1(size_t rdAddress, size_t rdOffset, size_t rs1Address, size_t rs1Offset) {
// rd on register 0
genSetRegisterImmediateUnsigned(0, rdAddress + rdOffset);
// rs1 on register 1
genSetRegisterImmediateUnsigned(1, rs1Address + rs1Offset);
}
void PimCodeGen::createRdRs1Rs2(
size_t rdAddress, size_t rdOffset, size_t rs1Address, size_t rs1Offset, size_t rs2Address, size_t rs2Offset) {
// rd on register 0
genSetRegisterImmediateUnsigned(0, rdAddress + rdOffset);
// rs1 on register 1
genSetRegisterImmediateUnsigned(1, rs1Address + rs1Offset);
// rs2 on register 2
genSetRegisterImmediateUnsigned(2, rs2Address + rs2Offset);
}
void PimCodeGen::codeGenLoadOp(pim::PimMemCopyHostToDevOp loadOp) {
auto deviceDst = loadOp.getDeviceDst();
auto hostSrc = loadOp.getHostSrc();
auto deviceDstOffset = loadOp.getDeviceDstOffset();
auto hostSrcOffset = loadOp.getHostSrcOffset();
auto size = loadOp.getSize();
auto deviceDstAlloc = memory.getValueAddress(deviceDst);
auto hostSrcAlloc = memory.getValueAddress(hostSrc);
// Set load rd register (reg 0)
createRdRs1(deviceDstAlloc, deviceDstOffset, hostSrcAlloc, hostSrcOffset);
llvm::json::Object loadOpJson;
loadOpJson["op"] = "ld";
loadOpJson["rd"] = 0;
loadOpJson["rs1"] = 1;
loadOpJson["size"] = size;
loadOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(loadOpJson)) << ',';
}
void PimCodeGen::codeGenStoreOp(pim::PimMemCopyDevToHostOp storeOp) {
auto hostDst = storeOp.getHostDst();
auto deviceSrc = storeOp.getDeviceSrc();
auto hostDstOffset = storeOp.getHostDstOffset();
auto deviceSrcOffset = storeOp.getDeviceSrcOffset();
auto size = storeOp.getSize();
auto deviceSrcAlloc = memory.getValueAddress(deviceSrc);
auto hostDstAlloc = memory.getValueAddress(hostDst);
// Set load rd register (reg 0)
createRdRs1(hostDstAlloc, hostDstOffset, deviceSrcAlloc, deviceSrcOffset);
llvm::json::Object storeOpJson;
storeOpJson["op"] = "st";
storeOpJson["rd"] = 0;
storeOpJson["rs1"] = 1;
storeOpJson["size"] = size;
storeOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(storeOpJson)) << ',';
}
template <typename MVMTy>
void PimCodeGen::codeGenMVMLikeOp(size_t mvmId, MVMTy mvmLikeOp, bool transposeMatrix) {
auto outBufAlloc = memory.getValueAddress(mvmLikeOp.getOutBuf());
auto vectorAlloc = memory.getValueAddress(mvmLikeOp.getVectorInput());
createRdRs1(outBufAlloc, 0, vectorAlloc, 0);
llvm::json::Object mvmOpJson;
mvmOpJson["op"] = "mvmul";
mvmOpJson["rd"] = 0;
mvmOpJson["rs1"] = 1;
mvmOpJson["group"] = mvmId;
mvmOpJson["relu"] = 0;
mvmOpJson["mbiw"] = 8;
coreFileStream << llvm::json::Value(std::move(mvmOpJson)) << ',';
// TODO: save weights somewhere (if transposeMatrix=true, then transpose the
// weight matrix)
}
void PimCodeGen::codeGenApplyFiltersOp(pim::PimApplyFiltersOp applyFiltersOp) {
auto outBuff = memory.getValueAddress(applyFiltersOp.getOutBuf());
auto inBuff = memory.getValueAddress(applyFiltersOp.getInput());
auto accumBuff = memory.getValueAddress(applyFiltersOp.getAccumBuf());
// Get weight indices from the operation attribute.
auto weightIndices = applyFiltersOp.getWeightIndices();
// Get shape of the input tensor.
auto inputType = cast<MemRefType>(applyFiltersOp.getInput().getType());
auto outputType = cast<MemRefType>(applyFiltersOp.getOutBuf().getType());
auto in_shape = inputType.getShape();
auto out_shape = outputType.getShape();
// Extract the relevant dimensions.
size_t in_channels = in_shape[1]; // Number of input channels.
size_t out_channels = out_shape[1]; // Number of output channels.
size_t dim2 = in_shape.size() > 2 ? in_shape[2] : 1; // Image width.
size_t dim3 = in_shape.size() > 3 ? in_shape[3] : 1; // Image height.
// Iterate through pixels.
for (size_t out_y = 0; out_y < dim3; out_y++) {
for (size_t out_x = 0; out_x < dim2; out_x++) {
// For each crossbar, perform the MVMUL operation.
size_t weightIndex = 0;
for (Attribute weight : weightIndices) {
// --------------------------------------
// --- STEP 1: Perform MVUL operation ---
// --------------------------------------
// Get the weight matrix ID for this position.
auto weightId = cast<IntegerAttr>(weight).getInt();
size_t xKer = cast<IntegerAttr>(applyFiltersOp.getXKernelPositions()[weightIndex]).getInt();
size_t yKer = cast<IntegerAttr>(applyFiltersOp.getYKernelPositions()[weightIndex]).getInt();
weightIndex++;
if (out_x + xKer >= dim2 || out_y + yKer >= dim3)
continue;
// Calculate the offset for the input (and output) tensor.
size_t output_offset = (out_y * dim2 + out_x) * 32 * out_channels;
size_t input_offset = ((out_y + yKer) * dim2 + (out_x + xKer)) * 32 * in_channels;
// Read from the input tensor and store the partial result in the
// accumulator buffer, if this is not the first weight matrix.
// Note that rs1 is the input tensor, and rd is the output tensor.
// TODO: This order of arguments is confusing, check if the correct
// order is being used in the WMVUL operation. The order below is
// correct.
if (weightIndices[0] != weight) {
createRdRs1(accumBuff, 0, inBuff, input_offset);
}
else {
// Otherwise store directly in the output buffer.
createRdRs1(outBuff, output_offset, inBuff, input_offset);
}
// Create the MVMUL JSON object
llvm::json::Object mvmOpJson;
mvmOpJson["op"] = "mvmul";
mvmOpJson["rd"] = 0;
mvmOpJson["rs1"] = 1;
mvmOpJson["group"] = weightId;
mvmOpJson["relu"] = 0;
mvmOpJson["mbiw"] = 8;
// Write the JSON to the output stream
coreFileStream << llvm::json::Value(std::move(mvmOpJson)) << ',';
// --------------------------------------
// --- STEP 2: Perform VADD operation ---
// --------------------------------------
// If this is the first weight matrix, we don't need to perform a VADD.
if (weightIndices[0] == weight)
continue;
// We now need to sum the value in the accumulator buffer with the value
// in the output buffer, and store the result in the output buffer.
createRdRs1Rs2(outBuff, output_offset, accumBuff, 0, outBuff, output_offset);
llvm::json::Object vaddOpJson;
vaddOpJson["op"] = "vvadd";
vaddOpJson["rd"] = 0;
vaddOpJson["rs1"] = 1;
vaddOpJson["rs2"] = 2;
vaddOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(vaddOpJson)) << ',';
}
}
}
}
void PimCodeGen::codeGenVAddOp(pim::PimVAddOp vaddOp) {
auto outBufAlloc = memory.getValueAddress(vaddOp.getOutBuf());
auto rs1BufferOp = memory.getValueAddress(vaddOp.getA());
auto rs2BufferOp = memory.getValueAddress(vaddOp.getB());
createRdRs1Rs2(outBufAlloc, 0, rs1BufferOp, 0, rs2BufferOp, 0);
// Get the size of the output buffer.
auto outputType = cast<MemRefType>(vaddOp.getOutBuf().getType());
auto out_shape = outputType.getShape();
// Multiply all dimension lengths to get the total number of elements.
size_t totalElements = 1;
for (size_t i = 0; i < out_shape.size(); i++)
totalElements *= out_shape[i];
auto elementSize = vaddOp.getOutRes().getType().getElementTypeBitWidth() / 8;
llvm::json::Object mvmOpJson;
mvmOpJson["op"] = "vvadd";
mvmOpJson["rd"] = 0;
mvmOpJson["rs1"] = 1;
mvmOpJson["rs2"] = 2;
mvmOpJson["offset"] = createEmptyOffset();
mvmOpJson["len"] = totalElements * elementSize;
coreFileStream << llvm::json::Value(std::move(mvmOpJson)) << ',';
}
void PimCodeGen::codeGenVMaxOp(pim::PimVMaxOp vmaxOp) {
auto outBufAlloc = memory.getValueAddress(vmaxOp.getOutBuf());
auto rs1BufferOp = memory.getValueAddress(vmaxOp.getA());
auto rs2BufferOp = memory.getValueAddress(vmaxOp.getB());
createRdRs1Rs2(outBufAlloc, 0, rs1BufferOp, 0, rs2BufferOp, 0);
llvm::json::Object mvmOpJson;
mvmOpJson["op"] = "vvmax";
mvmOpJson["rd"] = 0;
mvmOpJson["rs1"] = 1;
mvmOpJson["rs2"] = 2;
mvmOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(mvmOpJson)) << ',';
}
void PimCodeGen::codeGenVReluOp(pim::PimVReluOp vreluOp) {
auto outBufAlloc = memory.getValueAddress(vreluOp.getOutBuf());
auto rs1BufferOp = memory.getValueAddress(vreluOp.getA());
createRdRs1(outBufAlloc, 0, rs1BufferOp, 0);
llvm::json::Object mvmOpJson;
mvmOpJson["op"] = "vrelu";
mvmOpJson["rd"] = 0;
mvmOpJson["rs1"] = 1;
mvmOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(mvmOpJson)) << ',';
}
void PimCodeGen::codeGenReceiveOp(pim::PimReceiveOp receiveOp) {
auto destAlloc = memory.getValueAddress(receiveOp.getDst());
createRd(destAlloc, /* dest_offset = */ 0);
llvm::json::Object recvOpJson;
recvOpJson["op"] = "recv";
recvOpJson["rd"] = 0;
recvOpJson["core"] = receiveOp.getSrcCoreId();
recvOpJson["size"] = receiveOp.getSize();
recvOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(recvOpJson)) << ',';
}
void PimCodeGen::codeGenSendOp(pim::PimSendOp sendOp) {
auto srcAlloc = memory.getValueAddress(sendOp.getSrc());
// Technically a RS1 register, but its just a name..
createRd(srcAlloc, /* dest_offset = */ 0);
llvm::json::Object sendOpJson;
sendOpJson["op"] = "send";
sendOpJson["rd"] = 0;
sendOpJson["core"] = sendOp.getTargetCoreId();
sendOpJson["size"] = sendOp.getSize();
sendOpJson["offset"] = createEmptyOffset();
coreFileStream << llvm::json::Value(std::move(sendOpJson)) << ',';
}
size_t getMatrixSize(ShapedType matrixShape) {
if (matrixShape.getRank() != 2 && matrixShape.getRank() != 4)
assert(false && "Unsupported matrix shape");
return std::max(matrixShape.getDimSize(0), matrixShape.getDimSize(1));
}
std::string getMemorySizeAsString(size_t size) {
if (size > 1024 * 1024 * 1024)
return std::to_string(size / 1024 / 1024 / 1024) + " GB";
if (size > 1024 * 1024)
return std::to_string(size / 1024 / 1024) + " MB";
if (size > 1024)
return std::to_string(size / 1024) + " KB";
return std::to_string(size) + " Bytes";
}
int compileModuleToPIMJSON(const OwningOpRef<ModuleOp>& moduleOpRef, std::string& outputDirPath) {
ModuleOp moduleOp = moduleOpRef.get();
if (pimEmissionTarget != EmitPimCodegen) {
moduleOp.dump();
return CompilerSuccess;
}
if (!outputDirPath.empty()) {
if (auto error = llvm::sys::fs::create_directory(outputDirPath)) {
llvm::errs() << "Error creating output directory: " << outputDirPath << ": " << error.message() << '\n';
return InvalidOutputFileAccess;
}
}
// For each core, specify the number of crossbar per array group
// This implementation always assigns one crossbar per group
llvm::json::Object xbarsPerArrayGroup;
auto funcOps = moduleOp.getOps<func::FuncOp>();
assert(!funcOps.empty() && "No function found in the module");
auto funcOp = *funcOps.begin();
PimAcceleratorMemory memory;
memory.hostMem.allocateHost(moduleOp, funcOp);
// Write memory binary file
auto memoryFilePath = outputDirPath + "/memory.bin";
std::error_code errorCode;
llvm::raw_fd_ostream memoryFileStream(memoryFilePath, errorCode, llvm::sys::fs::OF_None);
if (errorCode) {
llvm::errs() << "Error while opening memory file " << memoryFilePath << ": " << errorCode.message() << '\n';
return InvalidOutputFileAccess;
}
// Zero-initialized buffer
std::vector<char> memoryBuffer(memory.hostMem.getFirstAvailableAddress(), 0);
// Write global values at their allocated addresses
funcOp.walk([&](memref::GetGlobalOp getGlobalOp) {
if (getGlobalOp->hasAttr("weightAlways"))
return;
auto globalOp = moduleOp.lookupSymbol<memref::GlobalOp>(getGlobalOp.getName());
if (!globalOp)
return;
auto initialValue = globalOp.getInitialValue();
if (!initialValue)
return;
auto denseAttr = dyn_cast<DenseElementsAttr>(*initialValue);
if (!denseAttr)
return;
auto memEntry = memory.hostMem.getMemEntry(getGlobalOp.getResult());
auto rawData = denseAttr.getRawData();
std::memcpy(memoryBuffer.data() + memEntry.address, rawData.data(), std::min(rawData.size(), memEntry.size));
});
memoryFileStream.write(memoryBuffer.data(), memoryBuffer.size());
memoryFileStream.close();
size_t coreCount = 0;
for (auto coreOp : funcOp.getOps<pim::PimCoreOp>()) {
auto coreId = coreOp.getCoreId();
coreCount++;
std::error_code errorCode;
auto outputCorePath = outputDirPath + "/core_" + std::to_string(coreId) + ".json";
llvm::raw_fd_ostream coreFileStream(outputCorePath, errorCode);
if (errorCode) {
llvm::errs() << "Error while opening core file `" << outputCorePath << "`: " << errorCode.message() << '\n';
return InvalidOutputFileAccess;
}
coreFileStream << '[';
auto coreNameString = "core" + std::to_string(coreId);
PimCodeGen coreCodeGen(memory, coreFileStream);
memory.getOrCreateDeviceMem(coreId).allocateCore(coreOp);
size_t processedOperations = 0;
for (auto& op : coreOp.getBody().front()) {
if (isa<memref::AllocOp>(op))
continue;
if (isa<pim::PimHaltOp>(op))
continue;
if (auto loadOp = dyn_cast<pim::PimMemCopyHostToDevOp>(op)) {
coreCodeGen.codeGenLoadOp(loadOp);
}
else if (auto storeOp = dyn_cast<pim::PimMemCopyDevToHostOp>(op)) {
coreCodeGen.codeGenStoreOp(storeOp);
}
else if (auto vmmOp = dyn_cast<pim::PimVMMOp>(op)) {
coreCodeGen.codeGenMVMLikeOp<pim::PimVMMOp>(vmmOp.getWeightIndex(), vmmOp, true);
}
else if (auto mvmOp = dyn_cast<pim::PimMVMOp>(op)) {
coreCodeGen.codeGenMVMLikeOp<pim::PimMVMOp>(mvmOp.getWeightIndex(), mvmOp, false);
}
else if (auto applyFiltersOp = dyn_cast<pim::PimApplyFiltersOp>(op)) {
coreCodeGen.codeGenApplyFiltersOp(applyFiltersOp);
}
else if (auto vaddOp = dyn_cast<pim::PimVAddOp>(op)) {
coreCodeGen.codeGenVAddOp(vaddOp);
}
else if (auto vmaxOp = dyn_cast<pim::PimVMaxOp>(op)) {
coreCodeGen.codeGenVMaxOp(vmaxOp);
}
else if (auto vreluOp = dyn_cast<pim::PimVReluOp>(op)) {
coreCodeGen.codeGenVReluOp(vreluOp);
}
else if (auto receiveOp = dyn_cast<pim::PimReceiveOp>(op)) {
coreCodeGen.codeGenReceiveOp(receiveOp);
}
else if (auto sendOp = dyn_cast<pim::PimSendOp>(op)) {
coreCodeGen.codeGenSendOp(sendOp);
}
else if (auto sumOp = dyn_cast<pim::PimSumOp>(op)) {
// TODO: Implement somehow?
op.emitWarning("Sum operation is not supported");
continue;
}
else if (auto vsDivOp = dyn_cast<pim::PimVSDivOp>(op)) {
// TODO: Implement somehow?
op.emitWarning("VSDiv operation is not supported");
continue;
}
else if (auto vexpOp = dyn_cast<pim::PimVExpOp>(op)) {
// TODO: Implement somehow?
op.emitWarning("VExp operation is not supported");
continue;
}
else if (isa<memref::SubViewOp>(op)) {
continue;
}
else {
op.emitError("Unsupported codegen for this operation");
op.dump();
return CompilerFailure;
}
processedOperations++;
}
assert(processedOperations > 0);
// Remove trailing comma
coreFileStream.seek(coreFileStream.tell() - 1);
coreFileStream << ']';
coreFileStream.close();
// Create output directory for this core's crossbar weights
auto coreWeightsDirPath = outputDirPath + "/core_" + std::to_string(coreId);
if (auto error = llvm::sys::fs::create_directory(coreWeightsDirPath)) {
llvm::errs() << "Error creating core directory: " << coreWeightsDirPath << ": " << error.message() << '\n';
return InvalidOutputFileAccess;
}
int64_t xbarSize = crossbarSize.getValue();
size_t weightIndex = 0;
llvm::json::Array xbarsPerGroup;
for (auto weight : coreOp.getWeights()) {
xbarsPerGroup.push_back(weightIndex);
auto getGlobalOp = weight.getDefiningOp<memref::GetGlobalOp>();
if (!getGlobalOp) {
coreOp.emitWarning("Weight is not from a memref.get_global at index " + std::to_string(weightIndex));
weightIndex++;
continue;
}
auto globalOp = SymbolTable::lookupNearestSymbolFrom<memref::GlobalOp>(moduleOp, getGlobalOp.getNameAttr());
if (!globalOp) {
coreOp.emitWarning("Could not find memref.global for weight at index " + std::to_string(weightIndex));
weightIndex++;
continue;
}
auto initialValue = globalOp.getInitialValue();
if (!initialValue) {
coreOp.emitWarning("memref.global has no initial value at index " + std::to_string(weightIndex));
weightIndex++;
continue;
}
auto denseAttr = dyn_cast<DenseElementsAttr>(*initialValue);
if (!denseAttr) {
coreOp.emitWarning("memref.global initial value is not dense at index " + std::to_string(weightIndex));
weightIndex++;
continue;
}
auto type = denseAttr.getType();
auto shape = type.getShape();
assert(isMatrixShape(shape) && "Weight matrix must be 2-dimensional");
int64_t numRows = shape[0];
int64_t numCols = shape[1];
assert(numRows <= xbarSize && numCols <= xbarSize && "Weight dimensions must not exceed crossbar size");
auto elementType = type.getElementType();
size_t elementByteWidth = elementType.getIntOrFloatBitWidth() / 8;
// Write crossbar weights as binary, padded to crossbarSize x crossbarSize
auto weightFilePath = coreWeightsDirPath + "/crossbar_" + std::to_string(weightIndex) + ".bin";
llvm::raw_fd_ostream weightFileStream(weightFilePath, errorCode, llvm::sys::fs::OF_None);
if (errorCode) {
llvm::errs() << "Error while opening weight file `" << weightFilePath << "`: " << errorCode.message() << '\n';
return InvalidOutputFileAccess;
}
uint64_t zero = 0;
for (int64_t row = 0; row < xbarSize; row++) {
for (int64_t col = 0; col < xbarSize; col++) {
if (row < numRows && col < numCols) {
int64_t index = row * numCols + col;
APInt bits = denseAttr.getValues<APFloat>()[index].bitcastToAPInt();
uint64_t word = bits.getZExtValue();
weightFileStream.write(reinterpret_cast<const char*>(&word), elementByteWidth);
}
else {
weightFileStream.write(reinterpret_cast<const char*>(&zero), elementByteWidth);
}
}
}
weightFileStream.close();
weightIndex++;
}
xbarsPerArrayGroup[coreNameString] = std::move(xbarsPerGroup);
}
// Step 3: Write configuration to JSON
llvm::json::Object configJson;
configJson["core_cnt"] = coreCount;
// TODO: Should this be based on the floating point type used in the model?
//// The 2 following values determine the bitwidth of the vectors' elements:
//// bitwidth = adc_count * cell_precision
// Number of ADC for MVM units
configJson["adc_count"] = 16;
// Bit precision of each ADC
configJson["cell_precision"] = 2;
//// Crossbar configuration
configJson["xbar_array_count"] = crossbarCountInCore.getValue();
configJson["xbar_size"] = {crossbarSize.getValue(), crossbarSize.getValue()};
// Store the crossbar sizes
configJson["array_group_map"] = std::move(xbarsPerArrayGroup);
// Store the memory layout of inputs and outputs
llvm::json::Array inputsAddresses;
for (BlockArgument input : funcOp.getArguments())
inputsAddresses.push_back(memory.getValueAddress(input));
configJson["inputs_addresses"] = std::move(inputsAddresses);
llvm::json::Array outputsAddresses;
for (func::ReturnOp returnOp : funcOp.getOps<func::ReturnOp>())
for (Value output : returnOp.getOperands())
outputsAddresses.push_back(memory.getValueAddress(output));
configJson["outputs_addresses"] = std::move(outputsAddresses);
// Step 4: Write config JSON
std::string openOutputErrorMsg;
auto configPath = outputDirPath + "/config.json";
std::error_code EC;
llvm::raw_fd_ostream jsonOS(configPath, EC);
if (EC) {
llvm::errs() << "Error while opening config file: " << EC.message() << '\n';
return InvalidOutputFileAccess;
}
jsonOS << llvm::json::Value(std::move(configJson)) << '\n';
jsonOS.close();
showCompilePhase("Code generated into " + configPath);
return CompilerSuccess;
}
} // namespace onnx_mlir
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