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/InlineCost.h"
  16 #include "llvm/Analysis/ProfileSummaryInfo.h"
  17 #include "llvm/Analysis/TargetLibraryInfo.h"
  18 #include "llvm/Analysis/TargetTransformInfo.h"
  19 #include "llvm/IR/CallSite.h"
  20 #include "llvm/IR/CallingConv.h"
  21 #include "llvm/IR/DataLayout.h"
  22 #include "llvm/IR/Instructions.h"
  23 #include "llvm/IR/Module.h"
  24 #include "llvm/IR/Type.h"
  25 #include "llvm/Transforms/IPO.h"
  26 #include "llvm/Transforms/IPO/Inliner.h"
  27
  28 using namespace llvm;
  29
  30 #define DEBUG_TYPE "inline"
  31
  32 namespace {
  33
  34 /// \brief Actual inliner pass implementation.
  35 ///
  36 /// The common implementation of the inlining logic is shared between this
  37 /// inliner pass and the always inliner pass. The two passes use different cost
  38 /// analyses to determine when to inline.
  39 class SimpleInliner : public LegacyInlinerBase {
  40
  41   InlineParams Params;
  42
  43 public:
  44   SimpleInliner() : LegacyInlinerBase(ID), Params(llvm::getInlineParams()) {
  45     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
  46   }
  47
  48   explicit SimpleInliner(InlineParams Params)
  49       : LegacyInlinerBase(ID), Params(std::move(Params)) {
  50     initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
  51   }
  52
  53   static char ID; // Pass identification, replacement for typeid
  54
  55   InlineCost getInlineCost(CallSite CS) override {
  56     Function *Callee = CS.getCalledFunction();
  57     TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
  58
  59     bool RemarksEnabled = false;
  60     const auto &BBs = CS.getCaller()->getBasicBlockList();
  61     if (!BBs.empty()) {
  62       auto DI = OptimizationRemark(DEBUG_TYPE, "", DebugLoc(), &BBs.front());
  63       if (DI.isEnabled())
  64         RemarksEnabled = true;
  65     }
  66     OptimizationRemarkEmitter ORE(CS.getCaller());
  67
  68     std::function<AssumptionCache &(Function &)> GetAssumptionCache =
  69         [&](Function &F) -> AssumptionCache & {
  70       return ACT->getAssumptionCache(F);
  71     };
  72     return llvm::getInlineCost(CS, Params, TTI, GetAssumptionCache,
  73                                /*GetBFI=*/None, PSI,
  74                                RemarksEnabled ? &ORE : nullptr);
  75   }
  76
  77   bool runOnSCC(CallGraphSCC &SCC) override;
  78   void getAnalysisUsage(AnalysisUsage &AU) const override;
  79
  80 private:
  81   TargetTransformInfoWrapperPass *TTIWP;
  82
  83 };
  84
  85 } // end anonymous namespace
  86
  87 char SimpleInliner::ID = 0;
  88 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline", "Function Integration/Inlining",
  89                       false, false)
  90 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
  91 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
  92 INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
  93 INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
  94 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
  95 INITIALIZE_PASS_END(SimpleInliner, "inline", "Function Integration/Inlining",
  96                     false, false)
  97
  98 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
  99
 100 Pass *llvm::createFunctionInliningPass(int Threshold) {
 101   return new SimpleInliner(llvm::getInlineParams(Threshold));
 102 }
 103
 104 Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
 105                                        unsigned SizeOptLevel,
 106                                        bool DisableInlineHotCallSite) {
 107   auto Param = llvm::getInlineParams(OptLevel, SizeOptLevel);
 108   if (DisableInlineHotCallSite)
 109     Param.HotCallSiteThreshold = 0;
 110   return new SimpleInliner(Param);
 111 }
 112
 113 Pass *llvm::createFunctionInliningPass(InlineParams &Params) {
 114   return new SimpleInliner(Params);
 115 }
 116
 117 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
 118   TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
 119   return LegacyInlinerBase::runOnSCC(SCC);
 120 }
 121
 122 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
 123   AU.addRequired<TargetTransformInfoWrapperPass>();
 124   LegacyInlinerBase::getAnalysisUsage(AU);
 125 }