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//===- OpenMPToLLVM.cpp - conversion from OpenMP to LLVM dialect ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/OpenMPToLLVM/ConvertOpenMPToLLVM.h"
#include "../PassDetail.h"
#include "mlir/Conversion/ArithmeticToLLVM/ArithmeticToLLVM.h"
#include "mlir/Conversion/ControlFlowToLLVM/ControlFlowToLLVM.h"
#include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVM.h"
#include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVMPass.h"
#include "mlir/Conversion/LLVMCommon/ConversionTarget.h"
#include "mlir/Conversion/LLVMCommon/Pattern.h"
#include "mlir/Conversion/MemRefToLLVM/MemRefToLLVM.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
using namespace mlir;
namespace {
/// A pattern that converts the region arguments in a single-region OpenMP
/// operation to the LLVM dialect. The body of the region is not modified and is
/// expected to either be processed by the conversion infrastructure or already
/// contain ops compatible with LLVM dialect types.
template <typename OpType>
struct RegionOpConversion : public ConvertOpToLLVMPattern<OpType> {
using ConvertOpToLLVMPattern<OpType>::ConvertOpToLLVMPattern;
LogicalResult
matchAndRewrite(OpType curOp, typename OpType::Adaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
auto newOp = rewriter.create<OpType>(
curOp.getLoc(), TypeRange(), adaptor.getOperands(), curOp->getAttrs());
rewriter.inlineRegionBefore(curOp.region(), newOp.region(),
newOp.region().end());
if (failed(rewriter.convertRegionTypes(&newOp.region(),
*this->getTypeConverter())))
return failure();
rewriter.eraseOp(curOp);
return success();
}
};
template <typename T>
struct RegionLessOpWithVarOperandsConversion
: public ConvertOpToLLVMPattern<T> {
using ConvertOpToLLVMPattern<T>::ConvertOpToLLVMPattern;
LogicalResult
matchAndRewrite(T curOp, typename T::Adaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
TypeConverter *converter = ConvertToLLVMPattern::getTypeConverter();
SmallVector<Type> resTypes;
if (failed(converter->convertTypes(curOp->getResultTypes(), resTypes)))
return failure();
SmallVector<Value> convertedOperands;
assert(curOp.getNumVariableOperands() ==
curOp.getOperation()->getNumOperands() &&
"unexpected non-variable operands");
for (unsigned idx = 0; idx < curOp.getNumVariableOperands(); ++idx) {
Value originalVariableOperand = curOp.getVariableOperand(idx);
if (!originalVariableOperand)
return failure();
if (originalVariableOperand.getType().isa<MemRefType>()) {
// TODO: Support memref type in variable operands
return rewriter.notifyMatchFailure(curOp,
"memref is not supported yet");
}
convertedOperands.emplace_back(adaptor.getOperands()[idx]);
}
rewriter.replaceOpWithNewOp<T>(curOp, resTypes, convertedOperands,
curOp->getAttrs());
return success();
}
};
struct ReductionOpConversion : public ConvertOpToLLVMPattern<omp::ReductionOp> {
using ConvertOpToLLVMPattern<omp::ReductionOp>::ConvertOpToLLVMPattern;
LogicalResult
matchAndRewrite(omp::ReductionOp curOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (curOp.accumulator().getType().isa<MemRefType>()) {
// TODO: Support memref type in variable operands
return rewriter.notifyMatchFailure(curOp, "memref is not supported yet");
}
rewriter.replaceOpWithNewOp<omp::ReductionOp>(
curOp, TypeRange(), adaptor.getOperands(), curOp->getAttrs());
return success();
}
};
} // namespace
void mlir::configureOpenMPToLLVMConversionLegality(
ConversionTarget &target, LLVMTypeConverter &typeConverter) {
target.addDynamicallyLegalOp<mlir::omp::CriticalOp, mlir::omp::ParallelOp,
mlir::omp::WsLoopOp, mlir::omp::MasterOp,
mlir::omp::SectionsOp, mlir::omp::SingleOp>(
[&](Operation *op) {
return typeConverter.isLegal(&op->getRegion(0)) &&
typeConverter.isLegal(op->getOperandTypes()) &&
typeConverter.isLegal(op->getResultTypes());
});
target
.addDynamicallyLegalOp<mlir::omp::AtomicReadOp, mlir::omp::AtomicWriteOp,
mlir::omp::FlushOp, mlir::omp::ThreadprivateOp>(
[&](Operation *op) {
return typeConverter.isLegal(op->getOperandTypes()) &&
typeConverter.isLegal(op->getResultTypes());
});
target.addDynamicallyLegalOp<mlir::omp::ReductionOp>([&](Operation *op) {
return typeConverter.isLegal(op->getOperandTypes());
});
}
void mlir::populateOpenMPToLLVMConversionPatterns(LLVMTypeConverter &converter,
RewritePatternSet &patterns) {
patterns.add<
ReductionOpConversion, RegionOpConversion<omp::CriticalOp>,
RegionOpConversion<omp::MasterOp>, ReductionOpConversion,
RegionOpConversion<omp::MasterOp>, RegionOpConversion<omp::ParallelOp>,
RegionOpConversion<omp::WsLoopOp>, RegionOpConversion<omp::SectionsOp>,
RegionOpConversion<omp::SingleOp>,
RegionLessOpWithVarOperandsConversion<omp::AtomicReadOp>,
RegionLessOpWithVarOperandsConversion<omp::AtomicWriteOp>,
RegionLessOpWithVarOperandsConversion<omp::FlushOp>,
RegionLessOpWithVarOperandsConversion<omp::ThreadprivateOp>>(converter);
}
namespace {
struct ConvertOpenMPToLLVMPass
: public ConvertOpenMPToLLVMBase<ConvertOpenMPToLLVMPass> {
void runOnOperation() override;
};
} // namespace
void ConvertOpenMPToLLVMPass::runOnOperation() {
auto module = getOperation();
// Convert to OpenMP operations with LLVM IR dialect
RewritePatternSet patterns(&getContext());
LLVMTypeConverter converter(&getContext());
arith::populateArithmeticToLLVMConversionPatterns(converter, patterns);
cf::populateControlFlowToLLVMConversionPatterns(converter, patterns);
populateMemRefToLLVMConversionPatterns(converter, patterns);
populateFuncToLLVMConversionPatterns(converter, patterns);
populateOpenMPToLLVMConversionPatterns(converter, patterns);
LLVMConversionTarget target(getContext());
target.addLegalOp<omp::TerminatorOp, omp::TaskyieldOp, omp::FlushOp,
omp::BarrierOp, omp::TaskwaitOp>();
configureOpenMPToLLVMConversionLegality(target, converter);
if (failed(applyPartialConversion(module, target, std::move(patterns))))
signalPassFailure();
}
std::unique_ptr<OperationPass<ModuleOp>> mlir::createConvertOpenMPToLLVMPass() {
return std::make_unique<ConvertOpenMPToLLVMPass>();
}
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