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/InlinerPass.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 Inliner {
42 // This field is populated based on one of the following:
43 // * optimization or size-optimization levels,
44 // * the --inline-threshold flag, or
45 // * a user specified value.
46 int DefaultThreshold;
47
48 public:
SimpleInliner()49 SimpleInliner()
50 : Inliner(ID), DefaultThreshold(llvm::getDefaultInlineThreshold()) {
51 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
52 }
53
SimpleInliner(int Threshold)54 explicit SimpleInliner(int Threshold)
55 : Inliner(ID), DefaultThreshold(Threshold) {
56 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
57 }
58
59 static char ID; // Pass identification, replacement for typeid
60
getInlineCost(CallSite CS)61 InlineCost getInlineCost(CallSite CS) override {
62 Function *Callee = CS.getCalledFunction();
63 TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
64 return llvm::getInlineCost(CS, DefaultThreshold, TTI, ACT, 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 } // end anonymous namespace
75
76 char SimpleInliner::ID = 0;
77 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
78 "Function Integration/Inlining", false, false)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)79 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
80 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
81 INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
82 INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
83 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
84 INITIALIZE_PASS_END(SimpleInliner, "inline",
85 "Function Integration/Inlining", false, false)
86
87 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
88
createFunctionInliningPass(int Threshold)89 Pass *llvm::createFunctionInliningPass(int Threshold) {
90 return new SimpleInliner(Threshold);
91 }
92
createFunctionInliningPass(unsigned OptLevel,unsigned SizeOptLevel)93 Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
94 unsigned SizeOptLevel) {
95 return new SimpleInliner(
96 llvm::computeThresholdFromOptLevels(OptLevel, SizeOptLevel));
97 }
98
runOnSCC(CallGraphSCC & SCC)99 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
100 TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
101 return Inliner::runOnSCC(SCC);
102 }
103
getAnalysisUsage(AnalysisUsage & AU) const104 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
105 AU.addRequired<TargetTransformInfoWrapperPass>();
106 Inliner::getAnalysisUsage(AU);
107 }
108