ffdbecccaf
This change adds a new op `alloc_tensor` to the bufferization dialect. During bufferization, this op is always lowered to a buffer allocation (unless it is "eliminated" by a pre-processing pass). It is useful to have such an op in tensor land, because it allows users to model tensor SSA use-def chains (which drive bufferization decisions) and because tensor SSA use-def chains can be analyzed by One-Shot Bufferize, while memref values cannot. This change also replaces all uses of linalg.init_tensor in bufferization-related code with bufferization.alloc_tensor. linalg.init_tensor and bufferization.alloc_tensor are similar, but the purpose of the former one is just to carry a shape. It does not indicate a memory allocation. linalg.init_tensor is not suitable for modelling SSA use-def chains for bufferization purposes, because linalg.init_tensor is marked as not having side effects (in contrast to alloc_tensor). As such, it is legal to move linalg.init_tensor ops around/CSE them/etc. This is not desirable for alloc_tensor; it represents an explicit buffer allocation while still in tensor land and such allocations should not suddenly disappear or get moved around when running the canonicalizer/CSE/etc. BEGIN_PUBLIC No public commit message needed for presubmit. END_PUBLIC Differential Revision: https://reviews.llvm.org/D126003
87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
//===----------------------------------------------------------------------===//
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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/Affine/IR/AffineOps.h"
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#include "mlir/Dialect/Bufferization/IR/Bufferization.h"
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#include "mlir/Dialect/MemRef/IR/MemRef.h"
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#include "mlir/Dialect/Tensor/IR/Tensor.h"
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#include "mlir/IR/FunctionInterfaces.h"
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#include "mlir/Transforms/InliningUtils.h"
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using namespace mlir;
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using namespace mlir::bufferization;
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#include "mlir/Dialect/Bufferization/IR/BufferizationOpsDialect.cpp.inc"
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/// Attribute name used to mark function arguments who's buffers can be written
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/// to during One-Shot Module Bufferize.
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constexpr const ::llvm::StringLiteral BufferizationDialect::kWritableAttrName;
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/// Attribute name used to mark the bufferization layout for region arguments
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/// during One-Shot Module Bufferize.
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constexpr const ::llvm::StringLiteral
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BufferizationDialect::kBufferLayoutAttrName;
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//===----------------------------------------------------------------------===//
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// Bufferization Dialect Interfaces
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//===----------------------------------------------------------------------===//
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namespace {
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struct BufferizationInlinerInterface : public DialectInlinerInterface {
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using DialectInlinerInterface::DialectInlinerInterface;
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/// Operations in Bufferization dialect are always legal to inline.
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bool isLegalToInline(Operation *, Region *, bool,
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BlockAndValueMapping &) const final {
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return true;
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}
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};
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} // namespace
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//===----------------------------------------------------------------------===//
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// Bufferization Dialect
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//===----------------------------------------------------------------------===//
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void mlir::bufferization::BufferizationDialect::initialize() {
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addOperations<
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#define GET_OP_LIST
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#include "mlir/Dialect/Bufferization/IR/BufferizationOps.cpp.inc"
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>();
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addInterfaces<BufferizationInlinerInterface>();
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}
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LogicalResult
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BufferizationDialect::verifyOperationAttribute(Operation *op,
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NamedAttribute attr) {
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using bufferization::BufferizableOpInterface;
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if (attr.getName() == kWritableAttrName) {
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if (!attr.getValue().isa<BoolAttr>()) {
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return op->emitError() << "'" << kWritableAttrName
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<< "' is expected to be a boolean attribute";
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}
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if (!isa<FunctionOpInterface>(op))
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return op->emitError() << "expected " << attr.getName()
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<< " to be used on function-like operations";
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return success();
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}
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if (attr.getName() == kBufferLayoutAttrName) {
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if (!attr.getValue().isa<AffineMapAttr>()) {
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return op->emitError() << "'" << kBufferLayoutAttrName
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<< "' is expected to be a affine map attribute";
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}
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if (!isa<FunctionOpInterface>(op))
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return op->emitError() << "expected " << attr.getName()
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<< " to be used on function-like operations";
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return success();
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}
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return op->emitError() << "attribute '" << attr.getName()
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<< "' not supported by the bufferization dialect";
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}
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