lib/Transforms/IPO/InlineSimple.cpp

   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/CallingConv.h"
  16 #include "llvm/Instructions.h"
  17 #include "llvm/IntrinsicInst.h"
  18 #include "llvm/Module.h"
  19 #include "llvm/Type.h"
  20 #include "llvm/Analysis/CallGraph.h"
  21 #include "llvm/Analysis/InlineCost.h"
  22 #include "llvm/Support/CallSite.h"
  23 #include "llvm/Transforms/IPO.h"
  24 #include "llvm/Transforms/IPO/InlinerPass.h"
  25 #include "llvm/DataLayout.h"
  26
  27 using namespace llvm;
  28
  29 namespace {
  30
  31   class SimpleInliner : public Inliner {
  32     InlineCostAnalyzer CA;
  33   public:
  34     SimpleInliner() : Inliner(ID) {
  35       initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
  36     }
  37     SimpleInliner(int Threshold) : Inliner(ID, Threshold,
  38                                            /*InsertLifetime*/true) {
  39       initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
  40     }
  41     static char ID; // Pass identification, replacement for typeid
  42     InlineCost getInlineCost(CallSite CS) {
  43       return CA.getInlineCost(CS, getInlineThreshold(CS));
  44     }
  45     virtual bool doInitialization(CallGraph &CG);
  46   };
  47 }
  48
  49 char SimpleInliner::ID = 0;
  50 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
  51                 "Function Integration/Inlining", false, false)
  52 INITIALIZE_AG_DEPENDENCY(CallGraph)
  53 INITIALIZE_PASS_END(SimpleInliner, "inline",
  54                 "Function Integration/Inlining", false, false)
  55
  56 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
  57
  58 Pass *llvm::createFunctionInliningPass(int Threshold) {
  59   return new SimpleInliner(Threshold);
  60 }
  61
  62 // doInitialization - Initializes the vector of functions that have been
  63 // annotated with the noinline attribute.
  64 bool SimpleInliner::doInitialization(CallGraph &CG) {
  65   CA.setDataLayout(getAnalysisIfAvailable<DataLayout>());
  66   return false;
  67 }
  68