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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_LIVEINTERVAL_H
#define RCC_CODEGEN_LIVEINTERVAL_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/CodeGen/Register.h"
#include "rcc/CodeGen/SlotIndexes.h"
#include "rcc/CodeGen/StableID.h"
#include "rcc/Support/Error.h"
#include <compare>
#include <cstdint>
#include <limits>
#include <optional>
#include <span>
#include <vector>
namespace rcc {
class LiveValueNumberID final {
public:
constexpr LiveValueNumberID() noexcept = default;
[[nodiscard]] static constexpr LiveValueNumberID fromValue(std::uint32_t Value) noexcept {
return LiveValueNumberID(Value);
}
[[nodiscard]] constexpr bool isValid() const noexcept {
return Value != 0;
}
[[nodiscard]] constexpr std::uint32_t value() const noexcept {
return Value;
}
friend constexpr bool operator==(LiveValueNumberID, LiveValueNumberID) noexcept = default;
friend constexpr auto operator<=>(LiveValueNumberID, LiveValueNumberID) noexcept = default;
private:
explicit constexpr LiveValueNumberID(std::uint32_t Value) noexcept : Value(Value) {}
std::uint32_t Value = 0;
};
enum class LiveValueState : std::uint8_t {
Normal,
Phi,
Unused,
Redefined,
};
struct LiveValueNumber final {
LiveValueNumberID ID;
SlotIndex Definition;
LiveValueState State = LiveValueState::Normal;
std::optional<MachineInstrStableID> Origin;
friend bool operator==(const LiveValueNumber &, const LiveValueNumber &) = default;
};
struct LiveSegment final {
SlotIndex Start;
SlotIndex End;
LiveValueNumberID Value;
[[nodiscard]] constexpr bool empty() const noexcept {
return !(Start < End);
}
[[nodiscard]] constexpr bool contains(SlotIndex Position) const noexcept {
return !(Position < Start) && Position < End;
}
[[nodiscard]] constexpr bool overlaps(const LiveSegment &Other) const noexcept {
return Start < Other.End && Other.Start < End;
}
friend constexpr bool operator==(const LiveSegment &, const LiveSegment &) noexcept = default;
};
class LiveRange final {
public:
[[nodiscard]] std::span<const LiveSegment> segments() const noexcept {
return Segments;
}
[[nodiscard]] std::span<const LiveValueNumber> values() const noexcept {
return Values;
}
[[nodiscard]] bool empty() const noexcept {
return Segments.empty();
}
[[nodiscard]] const LiveSegment *segmentAt(SlotIndex Position) const noexcept;
[[nodiscard]] const LiveValueNumber *value(LiveValueNumberID ID) const noexcept;
[[nodiscard]] const LiveValueNumber *valueAt(SlotIndex Position) const noexcept;
[[nodiscard]] bool liveAt(SlotIndex Position) const noexcept;
[[nodiscard]] bool overlaps(const LiveRange &Other) const noexcept;
[[nodiscard]] Expected<LiveValueNumberID>
createValue(SlotIndex Definition, LiveValueState State = LiveValueState::Normal,
std::optional<MachineInstrStableID> Origin = std::nullopt);
[[nodiscard]] Expected<void> addSegment(LiveSegment Segment);
[[nodiscard]] Expected<void> extend(LiveValueNumberID Value, SlotIndex Start, SlotIndex End);
[[nodiscard]] Expected<void> remove(SlotIndex Start, SlotIndex End);
[[nodiscard]] Expected<void> shrinkToUses(std::span<const SlotIndex> Uses);
[[nodiscard]] Expected<void> verify() const;
private:
void mergeAdjacent();
std::vector<LiveSegment> Segments;
std::vector<LiveValueNumber> Values;
};
struct LiveSubRange final {
LaneMask Lanes;
LiveRange Range;
};
struct LiveInterval final {
Register Reg;
LiveRange MainRange;
std::vector<LiveSubRange> SubRanges;
std::uint64_t SpillWeight = 0;
bool Spillable = true;
std::vector<PhysicalRegister> AllocationHints;
std::optional<Register> SplitParent;
std::optional<Register> Origin;
[[nodiscard]] bool overlaps(const LiveInterval &Other) const noexcept {
return MainRange.overlaps(Other.MainRange);
}
};
} // namespace rcc
template <> struct std::hash<rcc::LiveValueNumberID> {
[[nodiscard]] std::size_t operator()(rcc::LiveValueNumberID ID) const noexcept {
return std::hash<std::uint32_t>{}(ID.value());
}
};
#endif // RCC_CODEGEN_LIVEINTERVAL_H
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