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//===- BufferizationToMemRef.cpp - Bufferization to MemRef conversion -----===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements patterns to convert Bufferization dialect to MemRef
// dialect.
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/BufferizationToMemRef/BufferizationToMemRef.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/Bufferization/IR/Bufferization.h"
#include "mlir/Dialect/Bufferization/Transforms/Passes.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/SCF/IR/SCF.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/Transforms/DialectConversion.h"
namespace mlir {
#define GEN_PASS_DEF_CONVERTBUFFERIZATIONTOMEMREFPASS
#include "mlir/Conversion/Passes.h.inc"
} // namespace mlir
using namespace mlir;
namespace {
/// The CloneOpConversion transforms all bufferization clone operations into
/// memref alloc and memref copy operations. In the dynamic-shape case, it also
/// emits additional dim and constant operations to determine the shape. This
/// conversion does not resolve memory leaks if it is used alone.
struct CloneOpConversion : public OpConversionPattern<bufferization::CloneOp> {
using OpConversionPattern<bufferization::CloneOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(bufferization::CloneOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
Location loc = op->getLoc();
Type type = op.getType();
Value alloc;
if (auto unrankedType = dyn_cast<UnrankedMemRefType>(type)) {
// Constants
Value zero = arith::ConstantIndexOp::create(rewriter, loc, 0);
Value one = arith::ConstantIndexOp::create(rewriter, loc, 1);
// Dynamically evaluate the size and shape of the unranked memref
Value rank = memref::RankOp::create(rewriter, loc, op.getInput());
MemRefType allocType =
MemRefType::get({ShapedType::kDynamic}, rewriter.getIndexType());
Value shape = memref::AllocaOp::create(rewriter, loc, allocType, rank);
// Create a loop to query dimension sizes, store them as a shape, and
// compute the total size of the memref
auto loopBody = [&](OpBuilder &builder, Location loc, Value i,
ValueRange args) {
auto acc = args.front();
auto dim = memref::DimOp::create(rewriter, loc, op.getInput(), i);
memref::StoreOp::create(rewriter, loc, dim, shape, i);
acc = arith::MulIOp::create(rewriter, loc, acc, dim);
scf::YieldOp::create(rewriter, loc, acc);
};
auto size = scf::ForOp::create(rewriter, loc, zero, rank, one,
ValueRange(one), loopBody)
.getResult(0);
MemRefType memrefType = MemRefType::get({ShapedType::kDynamic},
unrankedType.getElementType());
// Allocate new memref with 1D dynamic shape, then reshape into the
// shape of the original unranked memref
alloc = memref::AllocOp::create(rewriter, loc, memrefType, size);
alloc =
memref::ReshapeOp::create(rewriter, loc, unrankedType, alloc, shape);
} else {
MemRefType memrefType = cast<MemRefType>(type);
MemRefLayoutAttrInterface layout;
auto allocType =
MemRefType::get(memrefType.getShape(), memrefType.getElementType(),
layout, memrefType.getMemorySpace());
// Since this implementation always allocates, certain result types of
// the clone op cannot be lowered.
if (!memref::CastOp::areCastCompatible({allocType}, {memrefType}))
return failure();
// Transform a clone operation into alloc + copy operation and pay
// attention to the shape dimensions.
SmallVector<Value, 4> dynamicOperands;
for (int i = 0; i < memrefType.getRank(); ++i) {
if (!memrefType.isDynamicDim(i))
continue;
Value dim = rewriter.createOrFold<memref::DimOp>(loc, op.getInput(), i);
dynamicOperands.push_back(dim);
}
// Allocate a memref with identity layout.
alloc =
memref::AllocOp::create(rewriter, loc, allocType, dynamicOperands);
// Cast the allocation to the specified type if needed.
if (memrefType != allocType)
alloc =
memref::CastOp::create(rewriter, op->getLoc(), memrefType, alloc);
}
memref::CopyOp::create(rewriter, loc, op.getInput(), alloc);
rewriter.replaceOp(op, alloc);
return success();
}
};
} // namespace
namespace {
struct BufferizationToMemRefPass
: public impl::ConvertBufferizationToMemRefPassBase<
BufferizationToMemRefPass> {
BufferizationToMemRefPass() = default;
void runOnOperation() override {
if (!isa<ModuleOp, FunctionOpInterface>(getOperation())) {
emitError(getOperation()->getLoc(),
"root operation must be a builtin.module or a function");
signalPassFailure();
return;
}
bufferization::DeallocHelperMap deallocHelperFuncMap;
if (auto module = dyn_cast<ModuleOp>(getOperation())) {
OpBuilder builder = OpBuilder::atBlockBegin(module.getBody());
// Build dealloc helper function if there are deallocs.
getOperation()->walk([&](bufferization::DeallocOp deallocOp) {
Operation *symtableOp =
deallocOp->getParentWithTrait<OpTrait::SymbolTable>();
if (deallocOp.getMemrefs().size() > 1 &&
!deallocHelperFuncMap.contains(symtableOp)) {
SymbolTable symbolTable(symtableOp);
func::FuncOp helperFuncOp =
bufferization::buildDeallocationLibraryFunction(
builder, getOperation()->getLoc(), symbolTable);
deallocHelperFuncMap[symtableOp] = helperFuncOp;
}
});
}
RewritePatternSet patterns(&getContext());
patterns.add<CloneOpConversion>(patterns.getContext());
bufferization::populateBufferizationDeallocLoweringPattern(
patterns, deallocHelperFuncMap);
ConversionTarget target(getContext());
target.addLegalDialect<memref::MemRefDialect, arith::ArithDialect,
scf::SCFDialect, func::FuncDialect>();
target.addIllegalDialect<bufferization::BufferizationDialect>();
if (failed(applyPartialConversion(getOperation(), target,
std::move(patterns))))
signalPassFailure();
}
};
} // namespace
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