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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_MACHINECOMBINERPATTERN_H
#define RCC_CODEGEN_MACHINECOMBINERPATTERN_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
#include <span>
#include <string>
#include <unordered_map>
#include <vector>
namespace rcc {
enum class MachineCombinerStage : std::uint8_t {
SelectedSSA,
PreRegisterAllocation,
PostRegisterAllocation,
PostFrame,
};
using MachineCombinerStageMask = std::uint8_t;
[[nodiscard]] constexpr MachineCombinerStageMask
machineCombinerStageMask(MachineCombinerStage Stage) noexcept {
return static_cast<MachineCombinerStageMask>(1U << static_cast<std::uint8_t>(Stage));
}
enum class MachineCombinerPredicateKind : std::uint8_t {
ImmediateEquals,
RegisterEquals,
PhysicalRegisterEquals,
RegisterIsVirtual,
RegisterIsPhysical,
};
struct MachineCombinerPredicate final {
MachineCombinerPredicateKind Kind = MachineCombinerPredicateKind::ImmediateEquals;
std::size_t Operand = 0;
std::size_t OtherOperand = 0;
std::int64_t Value = 0;
};
enum class MachineCombinerActionKind : std::uint8_t {
ReplaceDefWithOperandAndErase,
};
struct MachineCombinerAction final {
MachineCombinerActionKind Kind = MachineCombinerActionKind::ReplaceDefWithOperandAndErase;
std::size_t DefinitionOperand = 0;
std::size_t SourceOperand = 0;
};
struct MachineCombinerPattern final {
std::string Name;
Opcode RootOpcode;
MachineCombinerStageMask Stages = 0;
std::vector<MachineCombinerPredicate> Predicates;
MachineCombinerAction Action;
};
class TargetMachineCombinerInfo final {
public:
[[nodiscard]] static Expected<TargetMachineCombinerInfo>
create(std::vector<MachineCombinerPattern> Patterns);
[[nodiscard]] std::span<const MachineCombinerPattern> patterns(Opcode RootOpcode) const noexcept;
private:
explicit TargetMachineCombinerInfo(std::vector<MachineCombinerPattern> Patterns)
: Patterns(std::move(Patterns)) {}
std::vector<MachineCombinerPattern> Patterns;
std::unordered_map<Opcode, std::vector<MachineCombinerPattern>> MatchTable;
};
} // namespace rcc
#endif // RCC_CODEGEN_MACHINECOMBINERPATTERN_H
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