1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "mlir/Dialect/MemRef/IR/MemRef.h"
10 #include "mlir/Interfaces/SideEffectInterfaces.h"
11 #include "mlir/Transforms/InliningUtils.h"
12 
13 using namespace mlir;
14 using namespace mlir::memref;
15 
16 #include "mlir/Dialect/MemRef/IR/MemRefOpsDialect.cpp.inc"
17 
18 //===----------------------------------------------------------------------===//
19 // MemRefDialect Dialect Interfaces
20 //===----------------------------------------------------------------------===//
21 
22 namespace {
23 struct MemRefInlinerInterface : public DialectInlinerInterface {
24   using DialectInlinerInterface::DialectInlinerInterface;
25   bool isLegalToInline(Region *dest, Region *src, bool wouldBeCloned,
26                        BlockAndValueMapping &valueMapping) const final {
27     return true;
28   }
29   bool isLegalToInline(Operation *, Region *, bool wouldBeCloned,
30                        BlockAndValueMapping &) const final {
31     return true;
32   }
33 };
34 } // namespace
35 
36 void mlir::memref::MemRefDialect::initialize() {
37   addOperations<
38 #define GET_OP_LIST
39 #include "mlir/Dialect/MemRef/IR/MemRefOps.cpp.inc"
40       >();
41   addInterfaces<MemRefInlinerInterface>();
42 }
43 
44 /// Finds a single dealloc operation for the given allocated value.
45 llvm::Optional<Operation *> mlir::memref::findDealloc(Value allocValue) {
46   Operation *dealloc = nullptr;
47   for (Operation *user : allocValue.getUsers()) {
48     auto effectInterface = dyn_cast<MemoryEffectOpInterface>(user);
49     if (!effectInterface)
50       continue;
51     // Try to find a free effect that is applied to one of our values
52     // that will be automatically freed by our pass.
53     SmallVector<MemoryEffects::EffectInstance, 2> effects;
54     effectInterface.getEffectsOnValue(allocValue, effects);
55     const bool isFree =
56         llvm::any_of(effects, [&](MemoryEffects::EffectInstance &it) {
57           return isa<MemoryEffects::Free>(it.getEffect());
58         });
59     if (!isFree)
60       continue;
61     // If we found > 1 dealloc, return None.
62     if (dealloc)
63       return llvm::None;
64     dealloc = user;
65   }
66   return dealloc;
67 }
68