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//===- OpenACCToLLVM.cpp - Prepare OpenACC data for LLVM translation ------===//
//
// 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/OpenACCToLLVM/ConvertOpenACCToLLVM.h"
#include "mlir/Conversion/LLVMCommon/Pattern.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/OpenACC/OpenACC.h"
#include "mlir/IR/Builders.h"
#include "mlir/Pass/Pass.h"
namespace mlir {
#define GEN_PASS_DEF_CONVERTOPENACCTOLLVM
#include "mlir/Conversion/Passes.h.inc"
} // namespace mlir
using namespace mlir;
//===----------------------------------------------------------------------===//
// DataDescriptor implementation
//===----------------------------------------------------------------------===//
constexpr StringRef getStructName() { return "openacc_data"; }
/// Construct a helper for the given descriptor value.
DataDescriptor::DataDescriptor(Value descriptor) : StructBuilder(descriptor) {
assert(value != nullptr && "value cannot be null");
}
/// Builds IR creating an `undef` value of the data descriptor.
DataDescriptor DataDescriptor::undef(OpBuilder &builder, Location loc,
Type basePtrTy, Type ptrTy) {
Type descriptorType = LLVM::LLVMStructType::getNewIdentified(
builder.getContext(), getStructName(),
{basePtrTy, ptrTy, builder.getI64Type()});
Value descriptor = builder.create<LLVM::UndefOp>(loc, descriptorType);
return DataDescriptor(descriptor);
}
/// Check whether the type is a valid data descriptor.
bool DataDescriptor::isValid(Value descriptor) {
if (auto type = descriptor.getType().dyn_cast<LLVM::LLVMStructType>()) {
if (type.isIdentified() && type.getName().startswith(getStructName()) &&
type.getBody().size() == 3 &&
(type.getBody()[kPtrBasePosInDataDescriptor]
.isa<LLVM::LLVMPointerType>() ||
type.getBody()[kPtrBasePosInDataDescriptor]
.isa<LLVM::LLVMStructType>()) &&
type.getBody()[kPtrPosInDataDescriptor].isa<LLVM::LLVMPointerType>() &&
type.getBody()[kSizePosInDataDescriptor].isInteger(64))
return true;
}
return false;
}
/// Builds IR inserting the base pointer value into the descriptor.
void DataDescriptor::setBasePointer(OpBuilder &builder, Location loc,
Value basePtr) {
setPtr(builder, loc, kPtrBasePosInDataDescriptor, basePtr);
}
/// Builds IR inserting the pointer value into the descriptor.
void DataDescriptor::setPointer(OpBuilder &builder, Location loc, Value ptr) {
setPtr(builder, loc, kPtrPosInDataDescriptor, ptr);
}
/// Builds IR inserting the size value into the descriptor.
void DataDescriptor::setSize(OpBuilder &builder, Location loc, Value size) {
setPtr(builder, loc, kSizePosInDataDescriptor, size);
}
//===----------------------------------------------------------------------===//
// Conversion patterns
//===----------------------------------------------------------------------===//
namespace {
template <typename Op>
class LegalizeDataOpForLLVMTranslation : public ConvertOpToLLVMPattern<Op> {
using ConvertOpToLLVMPattern<Op>::ConvertOpToLLVMPattern;
LogicalResult
matchAndRewrite(Op op, typename Op::Adaptor adaptor,
ConversionPatternRewriter &builder) const override {
Location loc = op.getLoc();
TypeConverter *converter = ConvertToLLVMPattern::getTypeConverter();
unsigned numDataOperand = op.getNumDataOperands();
// Keep the non data operands without modification.
auto nonDataOperands = adaptor.getOperands().take_front(
adaptor.getOperands().size() - numDataOperand);
SmallVector<Value> convertedOperands;
convertedOperands.append(nonDataOperands.begin(), nonDataOperands.end());
// Go over the data operand and legalize them for translation.
for (unsigned idx = 0; idx < numDataOperand; ++idx) {
Value originalDataOperand = op.getDataOperand(idx);
// Traverse operands that were converted to MemRefDescriptors.
if (auto memRefType =
originalDataOperand.getType().dyn_cast<MemRefType>()) {
Type structType = converter->convertType(memRefType);
Value memRefDescriptor = builder
.create<UnrealizedConversionCastOp>(
loc, structType, originalDataOperand)
.getResult(0);
// Calculate the size of the memref and get the pointer to the allocated
// buffer.
SmallVector<Value> sizes;
SmallVector<Value> strides;
Value sizeBytes;
ConvertToLLVMPattern::getMemRefDescriptorSizes(
loc, memRefType, {}, builder, sizes, strides, sizeBytes);
MemRefDescriptor descriptor(memRefDescriptor);
Value dataPtr = descriptor.alignedPtr(builder, loc);
auto ptrType = descriptor.getElementPtrType();
auto descr = DataDescriptor::undef(builder, loc, structType, ptrType);
descr.setBasePointer(builder, loc, memRefDescriptor);
descr.setPointer(builder, loc, dataPtr);
descr.setSize(builder, loc, sizeBytes);
convertedOperands.push_back(descr);
} else if (originalDataOperand.getType().isa<LLVM::LLVMPointerType>()) {
convertedOperands.push_back(originalDataOperand);
} else {
// Type not supported.
return builder.notifyMatchFailure(op, "unsupported type");
}
}
builder.replaceOpWithNewOp<Op>(op, TypeRange(), convertedOperands,
op.getOperation()->getAttrs());
return success();
}
};
} // namespace
void mlir::populateOpenACCToLLVMConversionPatterns(
LLVMTypeConverter &converter, RewritePatternSet &patterns) {
patterns.add<LegalizeDataOpForLLVMTranslation<acc::DataOp>>(converter);
patterns.add<LegalizeDataOpForLLVMTranslation<acc::EnterDataOp>>(converter);
patterns.add<LegalizeDataOpForLLVMTranslation<acc::ExitDataOp>>(converter);
patterns.add<LegalizeDataOpForLLVMTranslation<acc::ParallelOp>>(converter);
patterns.add<LegalizeDataOpForLLVMTranslation<acc::UpdateOp>>(converter);
}
namespace {
struct ConvertOpenACCToLLVMPass
: public impl::ConvertOpenACCToLLVMBase<ConvertOpenACCToLLVMPass> {
void runOnOperation() override;
};
} // namespace
void ConvertOpenACCToLLVMPass::runOnOperation() {
auto op = getOperation();
auto *context = op.getContext();
// Convert to OpenACC operations with LLVM IR dialect
RewritePatternSet patterns(context);
LLVMTypeConverter converter(context);
populateOpenACCToLLVMConversionPatterns(converter, patterns);
ConversionTarget target(*context);
target.addLegalDialect<LLVM::LLVMDialect>();
target.addLegalOp<UnrealizedConversionCastOp>();
auto allDataOperandsAreConverted = [](ValueRange operands) {
for (Value operand : operands) {
if (!DataDescriptor::isValid(operand) &&
!operand.getType().isa<LLVM::LLVMPointerType>())
return false;
}
return true;
};
target.addDynamicallyLegalOp<acc::DataOp>(
[allDataOperandsAreConverted](acc::DataOp op) {
return allDataOperandsAreConverted(op.getCopyOperands()) &&
allDataOperandsAreConverted(op.getCopyinOperands()) &&
allDataOperandsAreConverted(op.getCopyinReadonlyOperands()) &&
allDataOperandsAreConverted(op.getCopyoutOperands()) &&
allDataOperandsAreConverted(op.getCopyoutZeroOperands()) &&
allDataOperandsAreConverted(op.getCreateOperands()) &&
allDataOperandsAreConverted(op.getCreateZeroOperands()) &&
allDataOperandsAreConverted(op.getNoCreateOperands()) &&
allDataOperandsAreConverted(op.getPresentOperands()) &&
allDataOperandsAreConverted(op.getDeviceptrOperands()) &&
allDataOperandsAreConverted(op.getAttachOperands());
});
target.addDynamicallyLegalOp<acc::EnterDataOp>(
[allDataOperandsAreConverted](acc::EnterDataOp op) {
return allDataOperandsAreConverted(op.getCopyinOperands()) &&
allDataOperandsAreConverted(op.getCreateOperands()) &&
allDataOperandsAreConverted(op.getCreateZeroOperands()) &&
allDataOperandsAreConverted(op.getAttachOperands());
});
target.addDynamicallyLegalOp<acc::ExitDataOp>(
[allDataOperandsAreConverted](acc::ExitDataOp op) {
return allDataOperandsAreConverted(op.getCopyoutOperands()) &&
allDataOperandsAreConverted(op.getDeleteOperands()) &&
allDataOperandsAreConverted(op.getDetachOperands());
});
target.addDynamicallyLegalOp<acc::ParallelOp>(
[allDataOperandsAreConverted](acc::ParallelOp op) {
return allDataOperandsAreConverted(op.getReductionOperands()) &&
allDataOperandsAreConverted(op.getCopyOperands()) &&
allDataOperandsAreConverted(op.getCopyinOperands()) &&
allDataOperandsAreConverted(op.getCopyinReadonlyOperands()) &&
allDataOperandsAreConverted(op.getCopyoutOperands()) &&
allDataOperandsAreConverted(op.getCopyoutZeroOperands()) &&
allDataOperandsAreConverted(op.getCreateOperands()) &&
allDataOperandsAreConverted(op.getCreateZeroOperands()) &&
allDataOperandsAreConverted(op.getNoCreateOperands()) &&
allDataOperandsAreConverted(op.getPresentOperands()) &&
allDataOperandsAreConverted(op.getDevicePtrOperands()) &&
allDataOperandsAreConverted(op.getAttachOperands()) &&
allDataOperandsAreConverted(op.getGangPrivateOperands()) &&
allDataOperandsAreConverted(op.getGangFirstPrivateOperands());
});
target.addDynamicallyLegalOp<acc::UpdateOp>(
[allDataOperandsAreConverted](acc::UpdateOp op) {
return allDataOperandsAreConverted(op.getHostOperands()) &&
allDataOperandsAreConverted(op.getDeviceOperands());
});
if (failed(applyPartialConversion(op, target, std::move(patterns))))
signalPassFailure();
}
std::unique_ptr<OperationPass<ModuleOp>>
mlir::createConvertOpenACCToLLVMPass() {
return std::make_unique<ConvertOpenACCToLLVMPass>();
}
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