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//===- ConvertToLLVMDialect.cpp - conversion from Linalg to LLVM dialect --===//
//
// Copyright 2019 The MLIR Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// =============================================================================
#include "mlir/Conversion/StandardToLLVM/ConvertStandardToLLVM.h"
#include "mlir/Conversion/StandardToLLVM/ConvertStandardToLLVMPass.h"
#include "mlir/EDSC/Builders.h"
#include "mlir/EDSC/Intrinsics.h"
#include "mlir/IR/Attributes.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/MLIRContext.h"
#include "mlir/IR/Module.h"
#include "mlir/IR/Operation.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/IR/StandardTypes.h"
#include "mlir/IR/Types.h"
#include "mlir/LLVMIR/LLVMDialect.h"
#include "mlir/Transforms/DialectConversion.h"
#include "mlir/Transforms/LowerAffine.h"
#include "linalg1/ConvertToLLVMDialect.h"
#include "linalg1/LLVMIntrinsics.h"
#include "linalg3/ConvertToLLVMDialect.h"
#include "linalg3/Ops.h"
using namespace mlir;
// Create an array attribute containing integer attributes with values provided
// in `position`.
static ArrayAttr makePositionAttr(Builder &builder, ArrayRef<int> position) {
SmallVector<Attribute, 4> attrs;
attrs.reserve(position.size());
for (auto p : position)
attrs.push_back(builder.getI64IntegerAttr(p));
return builder.getArrayAttr(attrs);
}
namespace {
// Common functionality for Linalg LoadOp and StoreOp conversion to the
// LLVM IR Dialect.
template <typename Op> class LoadStoreOpConversion : public ConversionPattern {
public:
explicit LoadStoreOpConversion(MLIRContext *context)
: ConversionPattern(Op::getOperationName(), 1, context) {}
using Base = LoadStoreOpConversion<Op>;
// Compute the pointer to an element of the buffer underlying the view given
// current view indices. Use the base offset and strides stored in the view
// descriptor to emit IR iteratively computing the actual offset, followed by
// a getelementptr.
Value *obtainDataPtr(Operation *op, Value *viewDescriptor,
ArrayRef<Value *> indices, Builder &rewriter) const {
auto loadOp = cast<Op>(op);
auto elementType =
loadOp.getViewType().template cast<linalg::ViewType>().getElementType();
elementType = linalg::convertLinalgType(elementType)
.template cast<LLVM::LLVMType>()
.getPointerTo();
auto int64Ty = linalg::convertLinalgType(rewriter.getIntegerType(64));
auto pos = [&rewriter](ArrayRef<int> values) {
return makePositionAttr(rewriter, values);
};
using namespace intrinsics;
// Linearize subscripts as:
// base_offset + SUM_i index_i * stride_i.
Value *offset = extractvalue(int64Ty, viewDescriptor, pos(1));
for (int i = 0, e = loadOp.getRank(); i < e; ++i) {
Value *stride = extractvalue(int64Ty, viewDescriptor, pos({3, i}));
Value *additionalOffset = mul(indices[i], stride);
offset = add(offset, additionalOffset);
}
Value *base = extractvalue(elementType, viewDescriptor, pos(0));
return gep(elementType, base, ArrayRef<Value *>{offset});
}
};
// A load is converted into the actual address computation, getelementptr and
// an LLVM IR load.
class LoadOpConversion : public LoadStoreOpConversion<linalg::LoadOp> {
using Base::Base;
PatternMatchResult matchAndRewrite(Operation *op, ArrayRef<Value *> operands,
PatternRewriter &rewriter) const override {
edsc::ScopedContext edscContext(rewriter, op->getLoc());
auto elementType = linalg::convertLinalgType(*op->result_type_begin());
Value *viewDescriptor = operands[0];
ArrayRef<Value *> indices = operands.drop_front();
Value *ptr = obtainDataPtr(op, viewDescriptor, indices, rewriter);
Value *element = intrinsics::load(elementType, ptr);
rewriter.replaceOp(op, {element});
return matchSuccess();
}
};
// A store is converted into the actual address computation, getelementptr and
// an LLVM IR store.
class StoreOpConversion : public LoadStoreOpConversion<linalg::StoreOp> {
using Base::Base;
PatternMatchResult matchAndRewrite(Operation *op, ArrayRef<Value *> operands,
PatternRewriter &rewriter) const override {
edsc::ScopedContext edscContext(rewriter, op->getLoc());
Value *viewDescriptor = operands[1];
Value *data = operands[0];
ArrayRef<Value *> indices = operands.drop_front(2);
Value *ptr = obtainDataPtr(op, viewDescriptor, indices, rewriter);
intrinsics::store(data, ptr);
rewriter.replaceOp(op, llvm::None);
return matchSuccess();
}
};
/// A type conversion class that converts Linalg and Std types to LLVM.
struct LinalgTypeConverter : public LLVMTypeConverter {
using LLVMTypeConverter::LLVMTypeConverter;
// This gets called for block and region arguments, and attributes.
Type convertType(Type t) override {
if (auto result = LLVMTypeConverter::convertType(t))
return result;
return linalg::convertLinalgType(t);
}
};
} // end anonymous namespace
// Helper function that allocates the descriptor converters and adds load/store
// coverters to the list.
static void populateLinalg3ToLLVMConversionPatterns(
mlir::OwningRewritePatternList &patterns, mlir::MLIRContext *context) {
RewriteListBuilder<LoadOpConversion, StoreOpConversion>::build(patterns,
context);
}
void linalg::convertLinalg3ToLLVM(Module &module) {
// Remove affine constructs.
for (auto func : module) {
auto rr = lowerAffineConstructs(func);
(void)rr;
assert(succeeded(rr) && "affine loop lowering failed");
}
// Convert Linalg ops to the LLVM IR dialect using the converter defined
// above.
LinalgTypeConverter converter(module.getContext());
OwningRewritePatternList patterns;
populateStdToLLVMConversionPatterns(converter, patterns);
populateLinalg1ToLLVMConversionPatterns(patterns, module.getContext());
populateLinalg3ToLLVMConversionPatterns(patterns, module.getContext());
ConversionTarget target(*module.getContext());
target.addLegalDialect<LLVM::LLVMDialect>();
auto r =
applyConversionPatterns(module, target, converter, std::move(patterns));
(void)r;
assert(succeeded(r) && "conversion failed");
}
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