#pragma once

#include <cstdint>

#include "infra/pipetrace.h"

struct inst {
    infra::transaction transaction;
    unsigned int generation;
    unsigned int size = 0;
    std::uint64_t linear_next_pc;
    std::optional<std::uint64_t> predicted_next_pc;
    std::uint64_t field[4] = {};
    std::optional<std::uint64_t> result;
};

constexpr unsigned int OPCODE = 0;
constexpr unsigned int FLAGS_DST = 1;
constexpr unsigned int SRC1 = 2;
constexpr unsigned int SRC2 = 3;

constexpr std::uint64_t FLAG_IMM1 = 1 << 4;
constexpr std::uint64_t FLAG_IMM2 = 1 << 5;

enum {
    OP_JUMP_ABS_IF_ZERO,
    OP_JUMP_ABS_IF_NONZERO,
    OP_EMIT,
    OP_ADD,
    OP_LOAD,
    OP_STORE,
};

struct decodebyte {
    std::uint8_t bits:4;
    std::uint8_t field:2;
    std::uint8_t invert:1;
    std::uint8_t hold:1;
} __attribute__((packed));

// 0x - shift opcode and issue
// 1x - shift flagsdst and issue
// 2x - shift src1 and issue
// 3x - shift src2 and issue
// 4x - invert+shift opcode and issue
// 5x - invert+shift flagsdst and issue
// 6x - invert+shift src1 and issue
// 7x - invert+shift src2 and issue
// 8x - shift opcode
// 9x - shift flagsdst
// Ax - shift src1
// Bx - shift src2
// Cx - invert+shift opcode
// Dx - invert+shift flagsdst
// Ex - invert+shift src1
// Fx - invert+shift src2