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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_GLOBALISEL_GISELVALUETRACKING_H
#define RCC_CODEGEN_GLOBALISEL_GISELVALUETRACKING_H
#include "rcc/ADT/APInt.h"
#include "rcc/CodeGen/GlobalISel/GISelChangeObserver.h"
#include "rcc/CodeGen/Register.h"
#include "rcc/Support/Error.h"
#include <cstdint>
namespace rcc {
class MachineFunction;
class MachineRegisterInfo;
class TargetDescription;
class GISelValueTracking final : public GISelChangeObserver {
public:
GISelValueTracking(MachineFunction &Function, const TargetDescription &Target,
unsigned MaxDepth = 6) noexcept;
[[nodiscard]] const MachineFunction &getMachineFunction() const noexcept {
return Function;
}
[[nodiscard]] Expected<APInt> getKnownZeroes(Register Reg) const;
[[nodiscard]] Expected<std::uint32_t> computeNumSignBits(Register Reg, unsigned Depth = 0) const;
void erasingInstr(MachineInstr &) override {}
void createdInstr(MachineInstr &) override {}
void changingInstr(MachineInstr &) override {}
void changedInstr(MachineInstr &) override {}
private:
struct KnownBits final {
APInt Zero;
APInt One;
};
[[nodiscard]] Expected<KnownBits> makeUnknown(std::uint32_t BitWidth) const;
[[nodiscard]] Expected<KnownBits> getKnownBits(Register Reg, unsigned Depth = 0) const;
MachineFunction &Function;
MachineRegisterInfo &MRI;
const TargetDescription &Target;
unsigned MaxDepth;
};
} // namespace rcc
#endif // RCC_CODEGEN_GLOBALISEL_GISELVALUETRACKING_H
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