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