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//===- InlineSimple.cpp - Code to perform simple function inlining --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements bottom-up inlining of functions into callees.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/InlineCost.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/Inliner.h"
using namespace llvm;
#define DEBUG_TYPE "inline"
namespace {
/// 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 LegacyInlinerBase {
InlineParams Params;
public:
SimpleInliner() : LegacyInlinerBase(ID), Params(llvm::getInlineParams()) {
initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
}
explicit SimpleInliner(InlineParams Params)
: LegacyInlinerBase(ID), Params(std::move(Params)) {
initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
}
static char ID; // Pass identification, replacement for typeid
InlineCost getInlineCost(CallSite CS) override {
Function *Callee = CS.getCalledFunction();
TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
bool RemarksEnabled = false;
const auto &BBs = CS.getCaller()->getBasicBlockList();
if (!BBs.empty()) {
auto DI = OptimizationRemark(DEBUG_TYPE, "", DebugLoc(), &BBs.front());
if (DI.isEnabled())
RemarksEnabled = true;
}
OptimizationRemarkEmitter ORE(CS.getCaller());
std::function<AssumptionCache &(Function &)> GetAssumptionCache =
[&](Function &F) -> AssumptionCache & {
return ACT->getAssumptionCache(F);
};
return llvm::getInlineCost(
cast<CallBase>(*CS.getInstruction()), Params, TTI, GetAssumptionCache,
/*GetBFI=*/None, PSI, RemarksEnabled ? &ORE : nullptr);
}
bool runOnSCC(CallGraphSCC &SCC) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
private:
TargetTransformInfoWrapperPass *TTIWP;
};
} // end anonymous namespace
char SimpleInliner::ID = 0;
INITIALIZE_PASS_BEGIN(SimpleInliner, "inline", "Function Integration/Inlining",
false, false)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_END(SimpleInliner, "inline", "Function Integration/Inlining",
false, false)
Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
Pass *llvm::createFunctionInliningPass(int Threshold) {
return new SimpleInliner(llvm::getInlineParams(Threshold));
}
Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
unsigned SizeOptLevel,
bool DisableInlineHotCallSite) {
auto Param = llvm::getInlineParams(OptLevel, SizeOptLevel);
if (DisableInlineHotCallSite)
Param.HotCallSiteThreshold = 0;
return new SimpleInliner(Param);
}
Pass *llvm::createFunctionInliningPass(InlineParams &Params) {
return new SimpleInliner(Params);
}
bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
return LegacyInlinerBase::runOnSCC(SCC);
}
void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<TargetTransformInfoWrapperPass>();
LegacyInlinerBase::getAnalysisUsage(AU);
}
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