42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
//===- MemRefUtils.cpp - Utilities to support the MemRef dialect ----------===//
|
|
//
|
|
// 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 utilities for the MemRef dialect.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "mlir/Dialect/MemRef/Utils/MemRefUtils.h"
|
|
#include "mlir/Interfaces/SideEffectInterfaces.h"
|
|
|
|
using namespace mlir;
|
|
|
|
/// Finds a single dealloc operation for the given allocated value.
|
|
llvm::Optional<Operation *> mlir::findDealloc(Value allocValue) {
|
|
Operation *dealloc = nullptr;
|
|
for (Operation *user : allocValue.getUsers()) {
|
|
auto effectInterface = dyn_cast<MemoryEffectOpInterface>(user);
|
|
if (!effectInterface)
|
|
continue;
|
|
// Try to find a free effect that is applied to one of our values
|
|
// that will be automatically freed by our pass.
|
|
SmallVector<MemoryEffects::EffectInstance, 2> effects;
|
|
effectInterface.getEffectsOnValue(allocValue, effects);
|
|
const bool isFree =
|
|
llvm::any_of(effects, [&](MemoryEffects::EffectInstance &it) {
|
|
return isa<MemoryEffects::Free>(it.getEffect());
|
|
});
|
|
if (!isFree)
|
|
continue;
|
|
// If we found > 1 dealloc, return None.
|
|
if (dealloc)
|
|
return llvm::None;
|
|
dealloc = user;
|
|
}
|
|
return dealloc;
|
|
}
|