LSHR.h

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// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <bit>
#include <climits>
#include <concepts>
#include <optional>
#include <type_traits>
 
namespace mini_llvm::ops {
 
struct LSHR {
    template <typename Tx, typename Ty>
        requires std::integral<Tx> && std::integral<Ty>
    std::optional<Tx> operator()(Tx x, Ty y) const noexcept {
        std::make_unsigned_t<Ty> uy = std::bit_cast<std::make_unsigned_t<Ty>>(y);
        if (uy >= static_cast<std::make_unsigned_t<Ty>>(sizeof(Tx) * CHAR_BIT))
            return std::nullopt;
        return
            std::bit_cast<Tx>(
                static_cast<std::make_unsigned_t<Tx>>(
                    std::bit_cast<std::make_unsigned_t<Tx>>(x) >> uy));
    }
 
    template <typename Ty>
        requires std::integral<Ty>
    std::optional<bool> operator()(bool x, Ty y) const noexcept {
        if (y != 0)
            return std::nullopt;
        return x;
    }
};
 
} // namespace mini_llvm::ops