6ecebb496c
This revision adds support for unstructured control flow to the bufferization infrastructure. In particular: regions with multiple blocks, `cf.br`, `cf.cond_br`. Two helper templates are added to `BufferizableOpInterface.h`, which can be implemented by ops that supported unstructured control flow in their regions (e.g., `func.func`) and ops that branch to another block (e.g., `cf.br`). A block signature is always bufferized together with the op that owns the block. Differential Revision: https://reviews.llvm.org/D158094
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
//===- BufferizableOpInterfaceImpl.cpp - Impl. of BufferizableOpInterface -===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/ControlFlow/Transforms/BufferizableOpInterfaceImpl.h"
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#include "mlir/Dialect/Bufferization/IR/Bufferization.h"
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#include "mlir/Dialect/Bufferization/IR/UnstructuredControlFlow.h"
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#include "mlir/Dialect/Bufferization/Transforms/OneShotAnalysis.h"
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#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h"
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#include "mlir/Dialect/MemRef/IR/MemRef.h"
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#include "mlir/IR/Dialect.h"
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#include "mlir/IR/Operation.h"
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using namespace mlir;
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using namespace mlir::bufferization;
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namespace mlir {
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namespace cf {
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namespace {
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template <typename ConcreteModel, typename ConcreteOp>
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struct BranchLikeOpInterface
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: public BranchOpBufferizableOpInterfaceExternalModel<ConcreteModel,
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ConcreteOp> {
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bool bufferizesToMemoryRead(Operation *op, OpOperand &opOperand,
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const AnalysisState &state) const {
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return false;
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}
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bool bufferizesToMemoryWrite(Operation *op, OpOperand &opOperand,
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const AnalysisState &state) const {
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return false;
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}
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LogicalResult verifyAnalysis(Operation *op,
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const AnalysisState &state) const {
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const auto &options =
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static_cast<const OneShotBufferizationOptions &>(state.getOptions());
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if (options.allowReturnAllocs)
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return success();
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return op->emitOpError(
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"op cannot be bufferized without allow-return-allocs");
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}
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LogicalResult bufferize(Operation *op, RewriterBase &rewriter,
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const BufferizationOptions &options) const {
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// The operands of this op are bufferized together with the block signature.
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return success();
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}
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};
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/// Bufferization of cf.br.
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struct BranchOpInterface
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: public BranchLikeOpInterface<BranchOpInterface, cf::BranchOp> {};
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/// Bufferization of cf.cond_br.
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struct CondBranchOpInterface
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: public BranchLikeOpInterface<CondBranchOpInterface, cf::CondBranchOp> {};
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} // namespace
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} // namespace cf
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} // namespace mlir
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void mlir::cf::registerBufferizableOpInterfaceExternalModels(
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DialectRegistry ®istry) {
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registry.addExtension(+[](MLIRContext *ctx, cf::ControlFlowDialect *dialect) {
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cf::BranchOp::attachInterface<BranchOpInterface>(*ctx);
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cf::CondBranchOp::attachInterface<CondBranchOpInterface>(*ctx);
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});
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}
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