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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_LIVEINTERVALS_H
#define RCC_CODEGEN_LIVEINTERVALS_H
#include "rcc/CodeGen/LiveInterval.h"
#include "rcc/CodeGen/MachinePass.h"
#include "rcc/CodeGen/RegisterMask.h"
#include <cstdint>
#include <memory>
#include <optional>
#include <span>
#include <string_view>
#include <unordered_map>
#include <vector>
namespace rcc {
class MachineFunction;
class MachineInstr;
class TargetDescription;
struct RegMaskPosition final {
SlotIndex Position;
MachineInstrStableID Instruction;
std::shared_ptr<const RegisterMask> Mask;
};
class LiveIntervalsAnalysis final {
public:
class Result final {
public:
[[nodiscard]] const SlotIndexesAnalysis::Result &slotIndexes() const noexcept {
return Indexes;
}
[[nodiscard]] SlotIndex slot(const MachineInstr &Instruction) const noexcept {
return Indexes.instructionIndex(Instruction);
}
[[nodiscard]] const LiveInterval *interval(Register Reg) const noexcept;
[[nodiscard]] LiveInterval *interval(Register Reg) noexcept;
[[nodiscard]] const LiveRange *regUnitRange(RegisterUnitID Unit) const noexcept;
[[nodiscard]] std::span<const RegMaskPosition> regMaskPositions() const noexcept {
return RegMasks;
}
[[nodiscard]] bool interferes(Register Left, Register Right) const noexcept;
[[nodiscard]] bool regMaskClobbers(const LiveInterval &Interval,
PhysicalRegister Candidate) const noexcept;
[[nodiscard]] Expected<void> shrinkToUses(Register Reg, std::span<const SlotIndex> Uses);
[[nodiscard]] bool invalidate(const MachineFunction &,
const PreservedAnalyses &Preserved) const noexcept;
private:
SlotIndexesAnalysis::Result Indexes;
std::unordered_map<Register, LiveInterval> Intervals;
std::unordered_map<RegisterUnitID, LiveRange> RegisterUnitRanges;
std::vector<RegMaskPosition> RegMasks;
friend class LiveIntervalsAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "LiveIntervals";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
} // namespace rcc
#endif // RCC_CODEGEN_LIVEINTERVALS_H
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