fa26c7ff4b
LICM is refactored into a utility that is application on any region. The implementation is moved to Transform/Utils.
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
//===- SideEffectUtils.cpp - Side Effect Utils ------------------*- 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/Transforms/SideEffectUtils.h"
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#include "mlir/IR/Operation.h"
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#include "mlir/Interfaces/SideEffectInterfaces.h"
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using namespace mlir;
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bool mlir::isSideEffectFree(Operation *op) {
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if (auto memInterface = dyn_cast<MemoryEffectOpInterface>(op)) {
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// If the op has side-effects, it cannot be moved.
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if (!memInterface.hasNoEffect())
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return false;
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// If the op does not have recursive side effects, then it can be moved.
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if (!op->hasTrait<OpTrait::HasRecursiveSideEffects>())
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return true;
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} else if (!op->hasTrait<OpTrait::HasRecursiveSideEffects>()) {
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// Otherwise, if the op does not implement the memory effect interface and
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// it does not have recursive side effects, then it cannot be known that the
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// op is moveable.
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return false;
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}
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// Recurse into the regions and ensure that all nested ops can also be moved.
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for (Region ®ion : op->getRegions())
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for (Operation &op : region.getOps())
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if (!isSideEffectFree(&op))
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return false;
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return true;
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}
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