1 //===- ReleaseModeModelRunner.cpp - Fast, precompiled model runner  -------===//
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 // This file implements a model runner wrapping an AOT compiled ML model.
10 // Only inference is supported.
11 //
12 //===----------------------------------------------------------------------===//
13 #include "llvm/Config/config.h"
14 #if defined(LLVM_HAVE_TF_AOT)
15 
16 #include "llvm/Analysis/InlineModelFeatureMaps.h"
17 #include "llvm/Analysis/MLInlineAdvisor.h"
18 
19 // codegen-ed file
20 #include "InlinerSizeModel.h" // NOLINT
21 
22 #include <memory>
23 #include <vector>
24 
25 using namespace llvm;
26 namespace {
27 
28 const char FeedPrefix[] = "feed_";
29 const char FetchPrefix[] = "fetch_";
30 
31 /// MLModelRunner - production mode implementation. It uses a AOT-compiled
32 /// SavedModel for efficient execution.
33 class ReleaseModeModelRunner final : public MLModelRunner {
34 public:
35   ReleaseModeModelRunner(LLVMContext &Ctx);
36   virtual ~ReleaseModeModelRunner() = default;
37 
38   bool run() override;
39 
40   void setFeature(FeatureIndex Index, int64_t Value) override;
41   int64_t getFeature(int Index) const override;
42 
43 private:
44   std::vector<int32_t> FeatureIndices;
45   int32_t ResultIndex = -1;
46   std::unique_ptr<llvm::InlinerSizeModel> CompiledModel;
47 };
48 } // namespace
49 
50 ReleaseModeModelRunner::ReleaseModeModelRunner(LLVMContext &Ctx)
51     : MLModelRunner(Ctx),
52       CompiledModel(std::make_unique<llvm::InlinerSizeModel>()) {
53   assert(CompiledModel && "The CompiledModel should be valid");
54 
55   FeatureIndices.resize(NumberOfFeatures);
56 
57   for (size_t I = 0; I < NumberOfFeatures; ++I) {
58     const int Index =
59         CompiledModel->LookupArgIndex(FeedPrefix + FeatureNameMap[I]);
60     assert(Index >= 0 && "Cannot find Feature in inlining model");
61     FeatureIndices[I] = Index;
62   }
63 
64   ResultIndex =
65       CompiledModel->LookupResultIndex(std::string(FetchPrefix) + DecisionName);
66   assert(ResultIndex >= 0 && "Cannot find DecisionName in inlining model");
67 }
68 
69 int64_t ReleaseModeModelRunner::getFeature(int Index) const {
70   return *static_cast<int64_t *>(
71       CompiledModel->arg_data(FeatureIndices[Index]));
72 }
73 
74 void ReleaseModeModelRunner::setFeature(FeatureIndex Index, int64_t Value) {
75   *static_cast<int64_t *>(CompiledModel->arg_data(
76       FeatureIndices[static_cast<size_t>(Index)])) = Value;
77 }
78 
79 bool ReleaseModeModelRunner::run() {
80   CompiledModel->Run();
81   return static_cast<bool>(
82       *static_cast<int64_t *>(CompiledModel->result_data(ResultIndex)));
83 }
84 
85 std::unique_ptr<InlineAdvisor>
86 llvm::getReleaseModeAdvisor(Module &M, ModuleAnalysisManager &MAM) {
87   auto AOTRunner = std::make_unique<ReleaseModeModelRunner>(M.getContext());
88   return std::make_unique<MLInlineAdvisor>(M, MAM, std::move(AOTRunner));
89 }
90 #endif // defined(LLVM_HAVE_TF_AOT)
91