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//===- RegAllocEvictionAdvisor.cpp - eviction 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 eviction advisor and of the Analysis pass.
//
//===----------------------------------------------------------------------===//
#include "RegAllocEvictionAdvisor.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/RegisterClassInfo.h"
#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/PassRegistry.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
static cl::opt<RegAllocEvictionAdvisorAnalysis::AdvisorMode> Mode(
"regalloc-enable-advisor", cl::Hidden,
cl::init(RegAllocEvictionAdvisorAnalysis::AdvisorMode::Default),
cl::desc("Enable regalloc advisor mode"),
cl::values(
clEnumValN(RegAllocEvictionAdvisorAnalysis::AdvisorMode::Default,
"default", "Default"),
clEnumValN(RegAllocEvictionAdvisorAnalysis::AdvisorMode::Release,
"release", "precompiled"),
clEnumValN(RegAllocEvictionAdvisorAnalysis::AdvisorMode::Development,
"development", "for training")));
static cl::opt<bool> EnableLocalReassignment(
"enable-local-reassign", cl::Hidden,
cl::desc("Local reassignment can yield better allocation decisions, but "
"may be compile time intensive"),
cl::init(false));
#define DEBUG_TYPE "regalloc"
char RegAllocEvictionAdvisorAnalysis::ID = 0;
INITIALIZE_PASS(RegAllocEvictionAdvisorAnalysis, "regalloc-evict",
"Regalloc eviction policy", false, true)
namespace {
class DefaultEvictionAdvisorAnalysis final
: public RegAllocEvictionAdvisorAnalysis {
public:
DefaultEvictionAdvisorAnalysis(bool NotAsRequested)
: RegAllocEvictionAdvisorAnalysis(AdvisorMode::Default),
NotAsRequested(NotAsRequested) {}
// support for isa<> and dyn_cast.
static bool classof(const RegAllocEvictionAdvisorAnalysis *R) {
return R->getAdvisorMode() == AdvisorMode::Default;
}
private:
std::unique_ptr<RegAllocEvictionAdvisor>
getAdvisor(const MachineFunction &MF, LiveRegMatrix *Matrix,
LiveIntervals *LIS, VirtRegMap *VRM,
const RegisterClassInfo &RegClassInfo,
ExtraRegInfo *ExtraInfo) override {
return std::make_unique<DefaultEvictionAdvisor>(MF, Matrix, LIS, VRM,
RegClassInfo, ExtraInfo);
}
bool doInitialization(Module &M) override {
if (NotAsRequested)
M.getContext().emitError("Requested regalloc eviction advisor analysis "
"could be created. Using default");
return RegAllocEvictionAdvisorAnalysis::doInitialization(M);
}
const bool NotAsRequested;
};
} // namespace
template <> Pass *llvm::callDefaultCtor<RegAllocEvictionAdvisorAnalysis>() {
Pass *Ret = nullptr;
switch (Mode) {
case RegAllocEvictionAdvisorAnalysis::AdvisorMode::Default:
Ret = new DefaultEvictionAdvisorAnalysis(/*NotAsRequested*/ false);
break;
case RegAllocEvictionAdvisorAnalysis::AdvisorMode::Development:
// TODO(mtrofin): add implementation
break;
case RegAllocEvictionAdvisorAnalysis::AdvisorMode::Release:
// TODO(mtrofin): add implementation
break;
}
if (Ret)
return Ret;
return new DefaultEvictionAdvisorAnalysis(/*NotAsRequested*/ true);
}
StringRef RegAllocEvictionAdvisorAnalysis::getPassName() const {
switch (getAdvisorMode()) {
case AdvisorMode::Default:
return "Default Regalloc Eviction Advisor";
case AdvisorMode::Release:
return "Release mode Regalloc Eviction Advisor";
case AdvisorMode::Development:
return "Development mode Regalloc Eviction Advisor";
}
llvm_unreachable("Unknown advisor kind");
}
RegAllocEvictionAdvisor::RegAllocEvictionAdvisor(
const MachineFunction &MF, LiveRegMatrix *Matrix, LiveIntervals *LIS,
VirtRegMap *VRM, const RegisterClassInfo &RegClassInfo,
ExtraRegInfo *ExtraInfo)
: MF(MF), Matrix(Matrix), LIS(LIS), VRM(VRM), MRI(&VRM->getRegInfo()),
TRI(MF.getSubtarget().getRegisterInfo()), RegClassInfo(RegClassInfo),
RegCosts(TRI->getRegisterCosts(MF)), ExtraInfo(ExtraInfo),
EnableLocalReassign(EnableLocalReassignment ||
MF.getSubtarget().enableRALocalReassignment(
MF.getTarget().getOptLevel())) {}
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