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/Target/TargetData.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);
  44     }
  45     float getInlineFudgeFactor(CallSite CS) {
  46       return CA.getInlineFudgeFactor(CS);
  47     }
  48     void resetCachedCostInfo(Function *Caller) {
  49       CA.resetCachedCostInfo(Caller);
  50     }
  51     void growCachedCostInfo(Function* Caller, Function* Callee) {
  52       CA.growCachedCostInfo(Caller, Callee);
  53     }
  54     virtual bool doInitialization(CallGraph &CG);
  55     void releaseMemory() {
  56       CA.clear();
  57     }
  58   };
  59 }
  60
  61 char SimpleInliner::ID = 0;
  62 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
  63                 "Function Integration/Inlining", false, false)
  64 INITIALIZE_AG_DEPENDENCY(CallGraph)
  65 INITIALIZE_PASS_END(SimpleInliner, "inline",
  66                 "Function Integration/Inlining", false, false)
  67
  68 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
  69
  70 Pass *llvm::createFunctionInliningPass(int Threshold) {
  71   return new SimpleInliner(Threshold);
  72 }
  73
  74 // doInitialization - Initializes the vector of functions that have been
  75 // annotated with the noinline attribute.
  76 bool SimpleInliner::doInitialization(CallGraph &CG) {
  77   CA.setTargetData(getAnalysisIfAvailable<TargetData>());
  78   return false;
  79 }
  80