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//===- RegAllocPriorityAdvisor.cpp - live ranges priority advisor ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Implementation of the default priority advisor and of the Analysis pass.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/RegAllocPriorityAdvisor.h"
#include "RegAllocGreedy.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
using namespace llvm;
static cl::opt<RegAllocPriorityAdvisorProvider::AdvisorMode> Mode(
"regalloc-enable-priority-advisor", cl::Hidden,
cl::init(RegAllocPriorityAdvisorProvider::AdvisorMode::Default),
cl::desc("Enable regalloc advisor mode"),
cl::values(
clEnumValN(RegAllocPriorityAdvisorProvider::AdvisorMode::Default,
"default", "Default"),
clEnumValN(RegAllocPriorityAdvisorProvider::AdvisorMode::Release,
"release", "precompiled"),
clEnumValN(RegAllocPriorityAdvisorProvider::AdvisorMode::Development,
"development", "for training"),
clEnumValN(
RegAllocPriorityAdvisorProvider::AdvisorMode::Dummy, "dummy",
"prioritize low virtual register numbers for test and debug")));
char RegAllocPriorityAdvisorAnalysisLegacy::ID = 0;
INITIALIZE_PASS(RegAllocPriorityAdvisorAnalysisLegacy, "regalloc-priority",
"Regalloc priority policy", false, true)
namespace {
class DefaultPriorityAdvisorProvider final
: public RegAllocPriorityAdvisorProvider {
public:
DefaultPriorityAdvisorProvider(bool NotAsRequested, LLVMContext &Ctx)
: RegAllocPriorityAdvisorProvider(AdvisorMode::Default) {
if (NotAsRequested)
Ctx.emitError("Requested regalloc priority advisor analysis "
"could be created. Using default");
}
// support for isa<> and dyn_cast.
static bool classof(const RegAllocPriorityAdvisorProvider *R) {
return R->getAdvisorMode() == AdvisorMode::Default;
}
std::unique_ptr<RegAllocPriorityAdvisor>
getAdvisor(const MachineFunction &MF, const RAGreedy &RA,
SlotIndexes &SI) override {
return std::make_unique<DefaultPriorityAdvisor>(MF, RA, &SI);
}
};
class DummyPriorityAdvisorProvider final
: public RegAllocPriorityAdvisorProvider {
public:
DummyPriorityAdvisorProvider()
: RegAllocPriorityAdvisorProvider(AdvisorMode::Dummy) {}
static bool classof(const RegAllocPriorityAdvisorProvider *R) {
return R->getAdvisorMode() == AdvisorMode::Dummy;
}
std::unique_ptr<RegAllocPriorityAdvisor>
getAdvisor(const MachineFunction &MF, const RAGreedy &RA,
SlotIndexes &SI) override {
return std::make_unique<DummyPriorityAdvisor>(MF, RA, &SI);
}
};
class DefaultPriorityAdvisorAnalysisLegacy final
: public RegAllocPriorityAdvisorAnalysisLegacy {
public:
DefaultPriorityAdvisorAnalysisLegacy(bool NotAsRequested)
: RegAllocPriorityAdvisorAnalysisLegacy(AdvisorMode::Default),
NotAsRequested(NotAsRequested) {}
// support for isa<> and dyn_cast.
static bool classof(const RegAllocPriorityAdvisorAnalysisLegacy *R) {
return R->getAdvisorMode() == AdvisorMode::Default;
}
private:
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<SlotIndexesWrapperPass>();
RegAllocPriorityAdvisorAnalysisLegacy::getAnalysisUsage(AU);
}
bool doInitialization(Module &M) override {
Provider.reset(
new DefaultPriorityAdvisorProvider(NotAsRequested, M.getContext()));
return false;
}
const bool NotAsRequested;
};
class DummyPriorityAdvisorAnalysis final
: public RegAllocPriorityAdvisorAnalysisLegacy {
public:
using RegAllocPriorityAdvisorAnalysisLegacy::AdvisorMode;
DummyPriorityAdvisorAnalysis()
: RegAllocPriorityAdvisorAnalysisLegacy(AdvisorMode::Dummy) {}
// support for isa<> and dyn_cast.
static bool classof(const RegAllocPriorityAdvisorAnalysisLegacy *R) {
return R->getAdvisorMode() == AdvisorMode::Dummy;
}
private:
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<SlotIndexesWrapperPass>();
RegAllocPriorityAdvisorAnalysisLegacy::getAnalysisUsage(AU);
}
bool doInitialization(Module &M) override {
Provider.reset(new DummyPriorityAdvisorProvider());
return false;
}
};
} // namespace
void RegAllocPriorityAdvisorAnalysis::initializeProvider(LLVMContext &Ctx) {
if (Provider)
return;
switch (Mode) {
case RegAllocPriorityAdvisorProvider::AdvisorMode::Dummy:
Provider.reset(new DummyPriorityAdvisorProvider());
return;
case RegAllocPriorityAdvisorProvider::AdvisorMode::Default:
Provider.reset(
new DefaultPriorityAdvisorProvider(/*NotAsRequested=*/false, Ctx));
return;
case RegAllocPriorityAdvisorProvider::AdvisorMode::Development:
#if defined(LLVM_HAVE_TFLITE)
Provider.reset(createDevelopmentModePriorityAdvisorProvider(Ctx));
#else
Provider.reset(
new DefaultPriorityAdvisorProvider(/*NotAsRequested=*/true, Ctx));
#endif
return;
case RegAllocPriorityAdvisorProvider::AdvisorMode::Release:
Provider.reset(createReleaseModePriorityAdvisorProvider());
return;
}
}
AnalysisKey RegAllocPriorityAdvisorAnalysis::Key;
RegAllocPriorityAdvisorAnalysis::Result
RegAllocPriorityAdvisorAnalysis::run(MachineFunction &MF,
MachineFunctionAnalysisManager &MFAM) {
// Lazily initialize the provider.
initializeProvider(MF.getFunction().getContext());
// The requiring analysis will construct the advisor.
return Result{Provider.get()};
}
template <>
Pass *llvm::callDefaultCtor<RegAllocPriorityAdvisorAnalysisLegacy>() {
Pass *Ret = nullptr;
switch (Mode) {
case RegAllocPriorityAdvisorProvider::AdvisorMode::Default:
Ret = new DefaultPriorityAdvisorAnalysisLegacy(/*NotAsRequested*/ false);
break;
case RegAllocPriorityAdvisorProvider::AdvisorMode::Development:
#if defined(LLVM_HAVE_TFLITE)
Ret = createDevelopmentModePriorityAdvisorAnalysis();
#endif
break;
case RegAllocPriorityAdvisorProvider::AdvisorMode::Release:
Ret = createReleaseModePriorityAdvisorAnalysis();
break;
case RegAllocPriorityAdvisorProvider::AdvisorMode::Dummy:
Ret = new DummyPriorityAdvisorAnalysis();
break;
}
if (Ret)
return Ret;
return new DefaultPriorityAdvisorAnalysisLegacy(/*NotAsRequested*/ true);
}
StringRef RegAllocPriorityAdvisorAnalysisLegacy::getPassName() const {
switch (getAdvisorMode()) {
case AdvisorMode::Default:
return "Default Regalloc Priority Advisor";
case AdvisorMode::Release:
return "Release mode Regalloc Priority Advisor";
case AdvisorMode::Development:
return "Development mode Regalloc Priority Advisor";
case AdvisorMode::Dummy:
return "Dummy Regalloc Priority Advisor";
}
llvm_unreachable("Unknown advisor kind");
}
RegAllocPriorityAdvisor::RegAllocPriorityAdvisor(const MachineFunction &MF,
const RAGreedy &RA,
SlotIndexes *const Indexes)
: RA(RA), LIS(RA.getLiveIntervals()), VRM(RA.getVirtRegMap()),
MRI(&VRM->getRegInfo()), TRI(MF.getSubtarget().getRegisterInfo()),
RegClassInfo(RA.getRegClassInfo()), Indexes(Indexes),
RegClassPriorityTrumpsGlobalness(
RA.getRegClassPriorityTrumpsGlobalness()),
ReverseLocalAssignment(RA.getReverseLocalAssignment()) {}
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