57609fb6dd
This diff makes findDealloc return nullopt if the list of users contains "realloc". Fixes https://github.com/llvm/llvm-project/issues/60726 (In particular, in SimplifyClones (uses findDealloc) treating "realloc" as "dealloc" breaks the assumption that "dealloc" has no users) Test plan: ninja check-mlir check-all Differential revision: https://reviews.llvm.org/D154892
62 lines
2.0 KiB
C++
62 lines
2.0 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/Arith/IR/Arith.h"
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#include "mlir/Dialect/MemRef/IR/MemRef.h"
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#include "mlir/Interfaces/SideEffectInterfaces.h"
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#include "mlir/Transforms/InliningUtils.h"
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#include <optional>
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using namespace mlir;
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using namespace mlir::memref;
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#include "mlir/Dialect/MemRef/IR/MemRefOpsDialect.cpp.inc"
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//===----------------------------------------------------------------------===//
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// MemRefDialect Dialect Interfaces
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//===----------------------------------------------------------------------===//
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namespace {
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struct MemRefInlinerInterface : public DialectInlinerInterface {
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using DialectInlinerInterface::DialectInlinerInterface;
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bool isLegalToInline(Region *dest, Region *src, bool wouldBeCloned,
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IRMapping &valueMapping) const final {
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return true;
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}
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bool isLegalToInline(Operation *, Region *, bool wouldBeCloned,
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IRMapping &) 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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void mlir::memref::MemRefDialect::initialize() {
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addOperations<
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#define GET_OP_LIST
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#include "mlir/Dialect/MemRef/IR/MemRefOps.cpp.inc"
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>();
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addInterfaces<MemRefInlinerInterface>();
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}
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/// Finds the unique dealloc operation (if one exists) for `allocValue`.
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std::optional<Operation *> mlir::memref::findDealloc(Value allocValue) {
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Operation *dealloc = nullptr;
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for (Operation *user : allocValue.getUsers()) {
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if (!hasEffect<MemoryEffects::Free>(user, allocValue))
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continue;
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// If we found a realloc instead of dealloc, return std::nullopt.
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if (isa<memref::ReallocOp>(user))
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return std::nullopt;
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// If we found > 1 dealloc, return std::nullopt.
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if (dealloc)
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return std::nullopt;
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dealloc = user;
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}
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return dealloc;
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}
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