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- Types.h：TIME 改 int64_t（毫秒），补 sat_add/sub/mul/div，除零与 INT_MIN/-1 规则 - Op.h：29 条操作码枚举 + mnemonic 助记符，数值即编码 - Instr.h：pack/拆字段 + 按形态 enc_rr/rrr/imm/jmp/jc/slot/call/ret
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/**
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* @file Instr.h
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* @brief 32-bit 指令打包 / 拆字段
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* @author
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* @date 2026-08-19
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*/
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#pragma once
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#include <cstdint>
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#include "isa/Op.h"
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namespace isa {
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// 指令字：[ op:8 | rd:8 | a:8 | b:8 ]，整体是一个小端 uint32_t。
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// 字段含义按操作码形态解释，见 Doc/isa/指令与映像.md。
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typedef uint32_t Instr;
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// 打包 / 拆字段
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inline Instr pack(Op op, uint8_t rd, uint8_t a, uint8_t b) {
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return static_cast<uint32_t>(static_cast<uint8_t>(op))
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| (static_cast<uint32_t>(rd) << 8)
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| (static_cast<uint32_t>(a) << 16)
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| (static_cast<uint32_t>(b) << 24);
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}
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inline Op op(Instr w) {
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return static_cast<Op>(w & 0xFFu);
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}
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inline uint8_t rd(Instr w) {
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return static_cast<uint8_t>((w >> 8) & 0xFFu);
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}
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inline uint8_t a(Instr w) {
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return static_cast<uint8_t>((w >> 16) & 0xFFu);
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}
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inline uint8_t b(Instr w) {
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return static_cast<uint8_t>((w >> 24) & 0xFFu);
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}
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// 组合视图：a|b 拼成 16 位（const_id / fn_id / slot）
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inline uint16_t imm16(Instr w) {
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return static_cast<uint16_t>(a(w) | (static_cast<uint16_t>(b(w)) << 8));
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}
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// 组合视图：a|b 为有符号相对偏移，单位是指令条数
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inline int16_t off16(Instr w) {
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return static_cast<int16_t>(imm16(w));
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}
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// 按形态的便捷编码
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inline Instr enc_rr(Op op, uint8_t rd, uint8_t rs) {
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return pack(op, rd, rs, 0); // MOVE / NOT：a = rs
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}
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inline Instr enc_rrr(Op op, uint8_t rd, uint8_t ra, uint8_t rb) {
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return pack(op, rd, ra, rb); // AND/OR/ADD/.../CMP_xx
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}
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inline Instr enc_imm(Op op, uint8_t rd, uint16_t imm) {
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return pack(op, rd, static_cast<uint8_t>(imm & 0xFFu),
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static_cast<uint8_t>((imm >> 8) & 0xFFu)); // LOADK
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}
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inline Instr enc_jmp(int16_t off) {
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return pack(Op::JMP, 0,
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static_cast<uint8_t>(static_cast<uint16_t>(off) & 0xFFu),
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static_cast<uint8_t>((static_cast<uint16_t>(off) >> 8) & 0xFFu));
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}
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inline Instr enc_jc(Op op, uint8_t r, int16_t off) {
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// JT / JF：条件寄存器在 rd，偏移在 a|b
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return pack(op, r,
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static_cast<uint8_t>(static_cast<uint16_t>(off) & 0xFFu),
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static_cast<uint8_t>((static_cast<uint16_t>(off) >> 8) & 0xFFu));
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}
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inline Instr enc_slot(Op op, uint8_t rd, uint16_t slot) {
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// LOAD_I / STORE_Q / LOAD_M / STORE_M / LOAD_GLOBAL / STORE_GLOBAL / CAL_*
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// 槽号 / 实例号在 a|b
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return enc_imm(op, rd, slot);
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}
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inline Instr enc_call(uint16_t fn_id) {
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return enc_imm(Op::CALL, 0, fn_id);
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}
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inline Instr enc_ret() {
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return pack(Op::RET, 0, 0, 0);
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}
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}
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