forked from OSchip/llvm-project
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
//===- InlineSimple.cpp - Code to perform simple function inlining --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements bottom-up inlining of functions into callees.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/InlineCost.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Transforms/IPO/InlinerPass.h"
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using namespace llvm;
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#define DEBUG_TYPE "inline"
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namespace {
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/// \brief Actual inliner pass implementation.
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///
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/// The common implementation of the inlining logic is shared between this
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/// inliner pass and the always inliner pass. The two passes use different cost
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/// analyses to determine when to inline.
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class SimpleInliner : public Inliner {
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InlineCostAnalysis *ICA;
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public:
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SimpleInliner() : Inliner(ID), ICA(nullptr) {
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initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
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}
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SimpleInliner(int Threshold)
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: Inliner(ID, Threshold, /*InsertLifetime*/ true), ICA(nullptr) {
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initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
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}
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static char ID; // Pass identification, replacement for typeid
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InlineCost getInlineCost(CallSite CS) override {
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return ICA->getInlineCost(CS, getInlineThreshold(CS));
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}
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bool runOnSCC(CallGraphSCC &SCC) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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};
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static int computeThresholdFromOptLevels(unsigned OptLevel,
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unsigned SizeOptLevel) {
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if (OptLevel > 2)
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return 275;
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if (SizeOptLevel == 1) // -Os
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return 75;
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if (SizeOptLevel == 2) // -Oz
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return 25;
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return 225;
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}
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} // end anonymous namespace
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char SimpleInliner::ID = 0;
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INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
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"Function Integration/Inlining", false, false)
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INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
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INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
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INITIALIZE_PASS_END(SimpleInliner, "inline",
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"Function Integration/Inlining", false, false)
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Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
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Pass *llvm::createFunctionInliningPass(int Threshold) {
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return new SimpleInliner(Threshold);
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}
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Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
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unsigned SizeOptLevel) {
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return new SimpleInliner(
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computeThresholdFromOptLevels(OptLevel, SizeOptLevel));
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}
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bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
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ICA = &getAnalysis<InlineCostAnalysis>();
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return Inliner::runOnSCC(SCC);
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}
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void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<InlineCostAnalysis>();
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Inliner::getAnalysisUsage(AU);
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}
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