contrib/llvm/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 #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:
  49   SimpleInliner()
  50       : Inliner(ID), DefaultThreshold(llvm::getDefaultInlineThreshold()) {
  51     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
  52   }
  53
  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
  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)
  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
  89 Pass *llvm::createFunctionInliningPass(int Threshold) {
  90   return new SimpleInliner(Threshold);
  91 }
  92
  93 Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
  94                                        unsigned SizeOptLevel) {
  95   return new SimpleInliner(
  96       llvm::computeThresholdFromOptLevels(OptLevel, SizeOptLevel));
  97 }
  98
  99 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
 100   TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
 101   return Inliner::runOnSCC(SCC);
 102 }
 103
 104 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
 105   AU.addRequired<TargetTransformInfoWrapperPass>();
 106   Inliner::getAnalysisUsage(AU);
 107 }