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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Instrumentation/PGOForceFunctionAttrs.h"
#include "llvm/Analysis/BlockFrequencyInfo.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
static bool shouldRunOnFunction(Function &F, ProfileSummaryInfo &PSI,
FunctionAnalysisManager &FAM) {
if (F.isDeclaration())
return false;
// Respect existing attributes.
if (F.hasOptNone() || F.hasOptSize() || F.hasMinSize())
return false;
if (F.hasFnAttribute(Attribute::Cold))
return true;
if (!PSI.hasProfileSummary())
return false;
BlockFrequencyInfo &BFI = FAM.getResult<BlockFrequencyAnalysis>(F);
return PSI.isFunctionColdInCallGraph(&F, BFI);
}
PreservedAnalyses PGOForceFunctionAttrsPass::run(Module &M,
ModuleAnalysisManager &AM) {
if (ColdType == PGOOptions::ColdFuncOpt::Default)
return PreservedAnalyses::all();
ProfileSummaryInfo &PSI = AM.getResult<ProfileSummaryAnalysis>(M);
FunctionAnalysisManager &FAM =
AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
bool MadeChange = false;
for (Function &F : M) {
if (!shouldRunOnFunction(F, PSI, FAM))
continue;
switch (ColdType) {
case PGOOptions::ColdFuncOpt::Default:
llvm_unreachable("bailed out for default above");
break;
case PGOOptions::ColdFuncOpt::OptSize:
F.addFnAttr(Attribute::OptimizeForSize);
break;
case PGOOptions::ColdFuncOpt::MinSize:
F.addFnAttr(Attribute::MinSize);
break;
case PGOOptions::ColdFuncOpt::OptNone:
// alwaysinline is incompatible with optnone.
if (F.hasFnAttribute(Attribute::AlwaysInline))
continue;
F.addFnAttr(Attribute::OptimizeNone);
F.addFnAttr(Attribute::NoInline);
break;
}
MadeChange = true;
}
return MadeChange ? PreservedAnalyses::none() : PreservedAnalyses::all();
}
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