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指令编码：CALL/CAL rd 恒 0 约定成文（U14）

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2026-08-24 16:05:56 +08:00
parent 721dfabf87
commit 2cc09903c9
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Doc/isa/指令编码.md
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@@ -93,8 +93,10 @@ func 决定"功能的细节"（宽度/符号/浮点）
| `010 010` | JMP | 00 | JMP | off32=47..16、pad=63..48 |
| `010 011` | JT | 00 | JC | rd=23..16、off32=55..24、pad=63..56 |
| `010 011` | JF | 01 | JC | 同上 |
| `010 100` | CALL | 00 | CALL | fn_id32=47..16、pad=63..48 |
| `010 101` | CAL | 00 | CAL | fb_id16=31..16、slot32=63..32 |
| `010 100` | CALL | 00 | CALL | fn_id32=47..16、pad=63..48（rd 恒 0） |
| `010 101` | CAL | 00 | CAL | fb_id16=31..16、slot32=63..32（rd 恒 0） |
> **rd 恒 0 约定（U14 定案）**：CALL / CAL 的 rd 字节（23..16）未使用，编码恒 0；指令身份由前缀分区 + op 决定，rd 不参与语义。
## 6. uses_rd / uses_ra / uses_rb（寄存器越界检查推导）