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feat: 二元幂运算 opcode 支持 number 与 BigInt

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- 新增 EXP opcode（0x94）与 emit 层 Exponential 分支，二元 a ** b 不再 compile error
- dispatch_exp 与 dispatch_compound_exp 共享 exp_result：IEEE-754 powf 快路径 +
  BigInt 幂（负/超 u32 指数 RangeError）+ 混合 BigInt/Number TypeError
- 复合 **= 补 BigInt 语义（此前走 f64 近似），与二元 ** 行为一致
This commit is contained in:
彭俊皓
2026-08-15 21:17:49 +08:00
parent 540ccc4a61
commit 78976cad0c
5 changed files with 125 additions and 8 deletions
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crates/oxide_bytecode/src/opcode.rs
+4
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@@ -193,6 +193,10 @@ define_opcodes! {
COMPOUND_EXP = 0x0B => "COMPOUND_EXP",
def = Some(SlotSpec::Slot(Slot::Rd)), uses = [SlotSpec::Slot(Slot::Rd), SlotSpec::Slot(Slot::A)],
pure = false, jump = false, term = false, ic = false,
// 二元幂运算 `a ** b`（三寄存器，与 SUB/MUL 同族；0x00-0x0F 已满，值用空闲槽 0x94）。
EXP = 0x94 => "EXP",
def = Some(SlotSpec::Slot(Slot::Rd)), uses = [SlotSpec::Slot(Slot::A), SlotSpec::Slot(Slot::B)],
pure = true, jump = false, term = false, ic = false,
MOV = 0x0C => "MOV", // rd=dst, a=src（寄存器复制，区间拆分搬值）
def = Some(SlotSpec::Slot(Slot::Rd)), uses = [SlotSpec::Slot(Slot::A)],
pure = true, jump = false, term = false, ic = false,