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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_LIVEREGMATRIX_H
#define RCC_CODEGEN_LIVEREGMATRIX_H
#include "rcc/CodeGen/LiveIntervals.h"
#include "rcc/CodeGen/TargetRegisterInfo.h"
#include <cstdint>
#include <optional>
#include <span>
#include <unordered_map>
#include <utility>
#include <vector>
namespace rcc {
class MachineFunction;
class TargetDescription;
enum class RegisterInterferenceKind : std::uint8_t {
Free,
VirtualRegister,
FixedRegister,
RegisterMask,
RegisterUnit,
};
struct RegisterInterference final {
RegisterInterferenceKind Kind = RegisterInterferenceKind::Free;
std::optional<Register> VirtualReg;
std::optional<PhysicalRegister> FixedReg;
std::optional<RegisterUnitID> Unit;
std::optional<MachineInstrStableID> Instruction;
};
class LiveRegMatrix final {
public:
LiveRegMatrix(const MachineFunction &Function, const TargetDescription &Target,
const LiveIntervalsAnalysis::Result &Intervals) noexcept
: Function(&Function), Target(&Target), Intervals(&Intervals) {}
[[nodiscard]] Expected<void> assign(Register VirtualReg, PhysicalRegister PhysicalReg);
[[nodiscard]] Expected<void> unassign(Register VirtualReg);
[[nodiscard]] std::optional<PhysicalRegister> assignment(Register VirtualReg) const noexcept;
[[nodiscard]] RegisterInterference checkInterference(Register VirtualReg,
PhysicalRegister PhysicalReg) const noexcept;
[[nodiscard]] std::vector<RegisterInterference>
collectInterferences(Register VirtualReg, PhysicalRegister PhysicalReg) const;
[[nodiscard]] std::span<const std::pair<Register, PhysicalRegister>>
assignments() const noexcept {
return OrderedAssignments;
}
private:
[[nodiscard]] bool intervalsOverlapOnCandidates(const LiveInterval &Left,
PhysicalRegister LeftReg,
const LiveInterval &Right,
PhysicalRegister RightReg) const noexcept;
[[nodiscard]] bool intervalOverlapsUnit(const LiveInterval &Interval, RegisterUnitLane Unit,
const LiveRange &UnitRange) const noexcept;
const MachineFunction *Function;
const TargetDescription *Target;
const LiveIntervalsAnalysis::Result *Intervals;
std::unordered_map<Register, PhysicalRegister> Assignments;
std::vector<std::pair<Register, PhysicalRegister>> OrderedAssignments;
};
} // namespace rcc
#endif // RCC_CODEGEN_LIVEREGMATRIX_H
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