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/CallGraph.h"
15 #include "llvm/Analysis/InlineCost.h"
16 #include "llvm/Analysis/ProfileSummaryInfo.h"
17 #include "llvm/Analysis/TargetLibraryInfo.h"
18 #include "llvm/Analysis/TargetTransformInfo.h"
19 #include "llvm/IR/CallSite.h"
20 #include "llvm/IR/CallingConv.h"
21 #include "llvm/IR/DataLayout.h"
22 #include "llvm/IR/Instructions.h"
23 #include "llvm/IR/IntrinsicInst.h"
24 #include "llvm/IR/Module.h"
25 #include "llvm/IR/Type.h"
26 #include "llvm/Transforms/IPO.h"
27 #include "llvm/Transforms/IPO/InlinerPass.h"
28 
29 using namespace llvm;
30 
31 #define DEBUG_TYPE "inline"
32 
33 namespace {
34 
35 /// \brief Actual inliner pass implementation.
36 ///
37 /// The common implementation of the inlining logic is shared between this
38 /// inliner pass and the always inliner pass. The two passes use different cost
39 /// analyses to determine when to inline.
40 class SimpleInliner : public Inliner {
41 
42   InlineParams Params;
43 
44 public:
45   SimpleInliner() : Inliner(ID), Params(llvm::getInlineParams()) {
46     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
47   }
48 
49   explicit SimpleInliner(InlineParams Params) : Inliner(ID), Params(Params) {
50     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
51   }
52 
53   static char ID; // Pass identification, replacement for typeid
54 
55   InlineCost getInlineCost(CallSite CS) override {
56     Function *Callee = CS.getCalledFunction();
57     TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
58     return llvm::getInlineCost(CS, Params, TTI, PSI);
59   }
60 
61   bool runOnSCC(CallGraphSCC &SCC) override;
62   void getAnalysisUsage(AnalysisUsage &AU) const override;
63 
64 private:
65   TargetTransformInfoWrapperPass *TTIWP;
66 
67 };
68 
69 } // end anonymous namespace
70 
71 char SimpleInliner::ID = 0;
72 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline", "Function Integration/Inlining",
73                       false, false)
74 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
75 INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
76 INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
77 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
78 INITIALIZE_PASS_END(SimpleInliner, "inline", "Function Integration/Inlining",
79                     false, false)
80 
81 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
82 
83 Pass *llvm::createFunctionInliningPass(int Threshold) {
84   return new SimpleInliner(llvm::getInlineParams(Threshold));
85 }
86 
87 Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
88                                        unsigned SizeOptLevel) {
89   return new SimpleInliner(llvm::getInlineParams(OptLevel, SizeOptLevel));
90 }
91 
92 Pass *llvm::createFunctionInliningPass(InlineParams &Params) {
93   return new SimpleInliner(Params);
94 }
95 
96 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
97   TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
98   return Inliner::runOnSCC(SCC);
99 }
100 
101 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
102   AU.addRequired<TargetTransformInfoWrapperPass>();
103   Inliner::getAnalysisUsage(AU);
104 }
105