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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_REGISTERPRESSURE_H
#define RCC_CODEGEN_REGISTERPRESSURE_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/CodeGen/ScheduleDAG.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
#include <span>
#include <unordered_map>
#include <vector>
namespace rcc {
class MachineFunction;
class TargetDescription;
class TargetSchedulingModel;
struct MachineBlockLiveness;
namespace detail {
struct RegisterPressureBuilder;
}
struct RegisterPressureValue final {
RegisterPressureSetID Set;
std::uint32_t Current = 0;
std::uint32_t Maximum = 0;
std::uint32_t Limit = 0;
friend constexpr bool operator==(RegisterPressureValue, RegisterPressureValue) noexcept = default;
};
struct RegisterPressureCost final {
std::uint64_t CurrentPressure = 0;
std::uint64_t CurrentExcess = 0;
std::uint64_t PeakExcess = 0;
std::uint64_t PeakIncrease = 0;
friend constexpr bool operator==(RegisterPressureCost, RegisterPressureCost) noexcept = default;
};
enum class RegisterPressureDirection : std::uint8_t {
TopDown,
BottomUp,
};
class RegisterPressureTracker final {
public:
[[nodiscard]] static Expected<RegisterPressureTracker>
create(const ScheduleDAG &DAG, const MachineFunction &Function, const TargetDescription &Target,
const TargetSchedulingModel &Model, ScheduleDAGMode Mode,
const MachineBlockLiveness &Liveness,
RegisterPressureDirection Direction = RegisterPressureDirection::TopDown);
[[nodiscard]] std::span<const RegisterPressureValue> pressure() const noexcept {
return Pressure;
}
[[nodiscard]] bool wasScheduled(std::size_t UnitID) const noexcept {
return UnitID < Scheduled.size() && Scheduled[UnitID];
}
[[nodiscard]] Expected<RegisterPressureCost> evaluate(std::size_t UnitID) const;
[[nodiscard]] Expected<void> schedule(std::size_t UnitID);
[[nodiscard]] RegisterPressureCost cost() const noexcept;
private:
using EntityID = std::size_t;
struct Entity final {
std::vector<RegisterPressureSetID> Sets;
std::size_t RemainingUses = 0;
bool HasDefinition = false;
bool DefinitionPending = false;
bool LiveOut = false;
bool Live = false;
};
struct Event final {
std::vector<EntityID> Uses;
std::vector<EntityID> Definitions;
};
struct UnitEffects final {
std::vector<Event> Events;
};
[[nodiscard]] Expected<void> applyEvent(const Event &Value);
[[nodiscard]] Expected<void> makeLive(EntityID Entity);
[[nodiscard]] Expected<void> makeDead(EntityID Entity);
std::vector<RegisterPressureValue> Pressure;
std::unordered_map<RegisterPressureSetID, std::size_t> PressureIndexes;
std::vector<Entity> Entities;
std::vector<UnitEffects> Effects;
std::vector<bool> Scheduled;
RegisterPressureDirection Direction = RegisterPressureDirection::TopDown;
friend struct detail::RegisterPressureBuilder;
};
} // namespace rcc
#endif // RCC_CODEGEN_REGISTERPRESSURE_H
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