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//===- LoopAnnotationImporter.h ---------------------------------*- C++ -*-===//
//
// 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 the translation between LLVMIR loop metadata and the
// corresponding MLIR representation.
//
//===----------------------------------------------------------------------===//
#ifndef MLIR_LIB_TARGET_LLVMIR_LOOPANNOTATIONIMPORTER_H_
#define MLIR_LIB_TARGET_LLVMIR_LOOPANNOTATIONIMPORTER_H_
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Target/LLVMIR/ModuleImport.h"
namespace mlir {
namespace LLVM {
namespace detail {
/// A helper class that converts llvm.loop metadata nodes into corresponding
/// LoopAnnotationAttrs and llvm.access.group nodes into AccessGroupAttrs.
class LoopAnnotationImporter {
public:
LoopAnnotationImporter(ModuleImport &moduleImport, OpBuilder &builder)
: moduleImport(moduleImport), builder(builder) {}
LoopAnnotationAttr translateLoopAnnotation(const llvm::MDNode *node,
Location loc);
/// Converts all LLVM access groups starting from node to MLIR access group
/// attributes. It stores a mapping from every nested access group node to the
/// translated attribute. Returns success if all conversions succeed and
/// failure otherwise.
LogicalResult translateAccessGroup(const llvm::MDNode *node, Location loc);
/// Returns the access group attribute that map to the access group nodes
/// starting from the access group metadata node. Returns failure, if any of
/// the attributes cannot be found.
FailureOr<SmallVector<AccessGroupAttr>>
lookupAccessGroupAttrs(const llvm::MDNode *node) const;
/// The ModuleImport owning this instance.
ModuleImport &moduleImport;
private:
/// Returns the LLVM metadata corresponding to a llvm loop metadata attribute.
LoopAnnotationAttr lookupLoopMetadata(const llvm::MDNode *node) const {
return loopMetadataMapping.lookup(node);
}
void mapLoopMetadata(const llvm::MDNode *metadata, LoopAnnotationAttr attr) {
auto result = loopMetadataMapping.try_emplace(metadata, attr);
(void)result;
assert(result.second &&
"attempting to map loop options that was already mapped");
}
OpBuilder &builder;
DenseMap<const llvm::MDNode *, LoopAnnotationAttr> loopMetadataMapping;
/// Mapping between original LLVM access group metadata nodes and the imported
/// MLIR access group attributes.
DenseMap<const llvm::MDNode *, AccessGroupAttr> accessGroupMapping;
};
} // namespace detail
} // namespace LLVM
} // namespace mlir
#endif // MLIR_LIB_TARGET_LLVMIR_LOOPANNOTATIONIMPORTER_H_
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