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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_SCHEDULEDAG_H
#define RCC_CODEGEN_SCHEDULEDAG_H
#include "rcc/CodeGen/StableID.h"
#include "rcc/CodeGen/TargetSchedulingModel.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
#include <optional>
#include <span>
#include <vector>
namespace rcc {
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class TargetDescription;
enum class ScheduleDAGMode : std::uint8_t {
PreRegisterAllocation,
PostRegisterAllocation,
};
enum class ScheduleDependencyKind : std::uint8_t {
Data,
Anti,
Output,
Order,
Memory,
Barrier,
Artificial,
Cluster,
RegisterUnit,
RegisterMask,
};
struct ScheduleDependency final {
std::size_t Source = 0;
std::size_t Destination = 0;
ScheduleDependencyKind Kind = ScheduleDependencyKind::Artificial;
std::uint32_t Latency = 0;
friend constexpr bool operator==(const ScheduleDependency &,
const ScheduleDependency &) noexcept = default;
};
struct ScheduleUnit final {
std::size_t ID = 0;
std::vector<MachineInstr *> Instructions;
std::vector<ScheduleDependency> Predecessors;
std::vector<ScheduleDependency> Successors;
std::vector<SchedulingResourceUse> Resources;
std::uint32_t MicroOps = 0;
std::uint32_t Latency = 0;
std::uint64_t Depth = 0;
std::uint64_t Height = 0;
MachineInstrStableID StableID;
std::optional<std::size_t> ClusterPredecessor;
std::optional<std::size_t> ClusterSuccessor;
};
class ScheduleDAG final {
public:
[[nodiscard]] static Expected<ScheduleDAG>
build(MachineBasicBlock &Block, std::span<MachineInstr *const> Instructions,
const MachineFunction &Function, const TargetDescription &Target,
const TargetSchedulingModel &Model, ScheduleDAGMode Mode, bool EmitDebugOutput = false);
[[nodiscard]] MachineBasicBlock &block() const noexcept {
return *Block;
}
[[nodiscard]] std::span<const ScheduleUnit> units() const noexcept {
return Units;
}
[[nodiscard]] std::span<ScheduleUnit> units() noexcept {
return Units;
}
[[nodiscard]] const ScheduleUnit *unit(std::size_t ID) const noexcept {
return ID < Units.size() ? &Units[ID] : nullptr;
}
[[nodiscard]] Expected<void> addArtificialDependency(std::size_t Source, std::size_t Destination,
std::uint32_t Latency);
[[nodiscard]] Expected<bool> fuseInstructionPair(std::size_t First, std::size_t Second);
private:
explicit ScheduleDAG(MachineBasicBlock &Block) : Block(&Block) {}
[[nodiscard]] Expected<void> buildUnits(std::span<MachineInstr *const> Instructions,
const TargetDescription &Target,
const TargetSchedulingModel &Model);
[[nodiscard]] Expected<void> buildRegisterDependencies(const MachineFunction &Function,
const TargetDescription &Target,
const TargetSchedulingModel &Model,
ScheduleDAGMode Mode);
[[nodiscard]] Expected<void> buildMemoryDependencies(const TargetDescription &Target);
[[nodiscard]] Expected<void> buildOrderDependencies(const TargetDescription &Target);
[[nodiscard]] bool hasPath(std::size_t Source, std::size_t Destination) const;
[[nodiscard]] bool hasDirectDependency(std::size_t Source, std::size_t Destination) const;
void addDependency(std::size_t Source, std::size_t Destination, ScheduleDependencyKind Kind,
std::uint32_t Latency);
[[nodiscard]] Expected<void> computeCriticalPaths();
MachineBasicBlock *Block;
std::vector<ScheduleUnit> Units;
};
} // namespace rcc
#endif // RCC_CODEGEN_SCHEDULEDAG_H
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