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 #define DEBUG_TYPE "inline"
15 #include "llvm/Transforms/IPO.h"
16 #include "llvm/Analysis/CallGraph.h"
17 #include "llvm/Analysis/InlineCost.h"
18 #include "llvm/IR/CallingConv.h"
19 #include "llvm/IR/DataLayout.h"
20 #include "llvm/IR/Instructions.h"
21 #include "llvm/IR/IntrinsicInst.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/IR/Type.h"
24 #include "llvm/Support/CallSite.h"
25 #include "llvm/Transforms/IPO/InlinerPass.h"
26
27 using namespace llvm;
28
29 namespace {
30
31 /// \brief Actaul inliner pass implementation.
32 ///
33 /// The common implementation of the inlining logic is shared between this
34 /// inliner pass and the always inliner pass. The two passes use different cost
35 /// analyses to determine when to inline.
36 class SimpleInliner : public Inliner {
37 InlineCostAnalysis *ICA;
38
39 public:
SimpleInliner()40 SimpleInliner() : Inliner(ID), ICA(0) {
41 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
42 }
43
SimpleInliner(int Threshold)44 SimpleInliner(int Threshold)
45 : Inliner(ID, Threshold, /*InsertLifetime*/ true), ICA(0) {
46 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
47 }
48
49 static char ID; // Pass identification, replacement for typeid
50
getInlineCost(CallSite CS)51 InlineCost getInlineCost(CallSite CS) {
52 return ICA->getInlineCost(CS, getInlineThreshold(CS));
53 }
54
55 virtual bool runOnSCC(CallGraphSCC &SCC);
56 virtual void getAnalysisUsage(AnalysisUsage &AU) const;
57 };
58
59 } // end anonymous namespace
60
61 char SimpleInliner::ID = 0;
62 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
63 "Function Integration/Inlining", false, false)
INITIALIZE_AG_DEPENDENCY(CallGraph)64 INITIALIZE_AG_DEPENDENCY(CallGraph)
65 INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
66 INITIALIZE_PASS_END(SimpleInliner, "inline",
67 "Function Integration/Inlining", false, false)
68
69 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
70
createFunctionInliningPass(int Threshold)71 Pass *llvm::createFunctionInliningPass(int Threshold) {
72 return new SimpleInliner(Threshold);
73 }
74
runOnSCC(CallGraphSCC & SCC)75 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
76 ICA = &getAnalysis<InlineCostAnalysis>();
77 return Inliner::runOnSCC(SCC);
78 }
79
getAnalysisUsage(AnalysisUsage & AU) const80 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
81 AU.addRequired<InlineCostAnalysis>();
82 Inliner::getAnalysisUsage(AU);
83 }
84