1 //===- InlineSimple.cpp - Code to perform simple function inlining --------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements bottom-up inlining of functions into callees.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Analysis/AssumptionCache.h"
15 #include "llvm/Analysis/CallGraph.h"
16 #include "llvm/Analysis/InlineCost.h"
17 #include "llvm/Analysis/ProfileSummaryInfo.h"
18 #include "llvm/Analysis/TargetLibraryInfo.h"
19 #include "llvm/Analysis/TargetTransformInfo.h"
20 #include "llvm/IR/CallSite.h"
21 #include "llvm/IR/CallingConv.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/IR/Instructions.h"
24 #include "llvm/IR/IntrinsicInst.h"
25 #include "llvm/IR/Module.h"
26 #include "llvm/IR/Type.h"
27 #include "llvm/Transforms/IPO.h"
28 #include "llvm/Transforms/IPO/Inliner.h"
29 
30 using namespace llvm;
31 
32 #define DEBUG_TYPE "inline"
33 
34 namespace {
35 
36 /// \brief Actual inliner pass implementation.
37 ///
38 /// The common implementation of the inlining logic is shared between this
39 /// inliner pass and the always inliner pass. The two passes use different cost
40 /// analyses to determine when to inline.
41 class SimpleInliner : public LegacyInlinerBase {
42 
43   InlineParams Params;
44 
45 public:
46   SimpleInliner() : LegacyInlinerBase(ID), Params(llvm::getInlineParams()) {
47     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
48   }
49 
50   explicit SimpleInliner(InlineParams Params)
51       : LegacyInlinerBase(ID), Params(Params) {
52     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
53   }
54 
55   static char ID; // Pass identification, replacement for typeid
56 
57   InlineCost getInlineCost(CallSite CS) override {
58     Function *Callee = CS.getCalledFunction();
59     TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
60     std::function<AssumptionCache &(Function &)> GetAssumptionCache =
61         [&](Function &F) -> AssumptionCache & {
62       return ACT->getAssumptionCache(F);
63     };
64     return llvm::getInlineCost(CS, Params, TTI, GetAssumptionCache, PSI);
65   }
66 
67   bool runOnSCC(CallGraphSCC &SCC) override;
68   void getAnalysisUsage(AnalysisUsage &AU) const override;
69 
70 private:
71   TargetTransformInfoWrapperPass *TTIWP;
72 
73 };
74 
75 } // end anonymous namespace
76 
77 char SimpleInliner::ID = 0;
78 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline", "Function Integration/Inlining",
79                       false, false)
80 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
81 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
82 INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
83 INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
84 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
85 INITIALIZE_PASS_END(SimpleInliner, "inline", "Function Integration/Inlining",
86                     false, false)
87 
88 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
89 
90 Pass *llvm::createFunctionInliningPass(int Threshold) {
91   return new SimpleInliner(llvm::getInlineParams(Threshold));
92 }
93 
94 Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
95                                        unsigned SizeOptLevel) {
96   return new SimpleInliner(llvm::getInlineParams(OptLevel, SizeOptLevel));
97 }
98 
99 Pass *llvm::createFunctionInliningPass(InlineParams &Params) {
100   return new SimpleInliner(Params);
101 }
102 
103 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
104   TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
105   return LegacyInlinerBase::runOnSCC(SCC);
106 }
107 
108 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
109   AU.addRequired<TargetTransformInfoWrapperPass>();
110   LegacyInlinerBase::getAnalysisUsage(AU);
111 }
112