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perf: IC 多态化 4 槽缓存（FIFO 滚动写回）消除多态场景 miss 重解析

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每条 IC 指令扩展字 3→8（4 槽 × [shape_id|proto_depth, slot]），命中槽 0
单态快路径零额外成本，槽 1..3 懒解码遍历，miss 写回 FIFO 滚动（新条目进
槽 0、最老丢弃）。修复原型链 IC 深度解析多走一步与 prop_forge 模板不匹配
不写回两个使缓存恒失效的问题。ic_cache 基准命中率 34.8%→78.9%，
耗时 -29%；单态 prop_access 因扩展字布局膨胀有 ~20% 取指回归（后续
side-table 方案可根除）。
This commit is contained in:
彭俊皓
2026-08-15 06:40:19 +08:00
parent 96da78e817
commit b62348eb5d
9 changed files with 388 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/oxide_ir/tests/lowering_tests.rs
+6 -6
View File
@@ -87,7 +87,7 @@ fn backward_jump_encodes_negative_offset() {
#[test]
fn jump_offset_counts_ext_words_in_target() {
// jmp(0) → ic_get（1 + 3 ext = 4 instr）→ ADD（instr 5）
// jmp(0) → ic_get（1 + 8 ext = 9 instr）→ ADD（instr 10）
let mut f = base_module();
f.insts.push(Inst::jmp(0));
f.insts.push(Inst::ic_get(Operand::Reg(1), Operand::Reg(2)));
@@ -96,21 +96,21 @@ fn jump_offset_counts_ext_words_in_target() {
f.label_pos = vec![Some(2)];
f.label_count = 1;
let m = lower_ok(&f);
assert_eq!(m.bytecode.len(), 1 + 4 + 1);
assert_eq!(opcode::offset16(m.bytecode[0]), 5);
assert_eq!(m.bytecode.len(), 1 + 9 + 1);
assert_eq!(opcode::offset16(m.bytecode[0]), 10);
}
#[test]
fn ic_get_carries_three_zero_ext_words() {
fn ic_get_carries_ic_slots_zero_ext_words() {
let mut f = base_module();
f.insts.push(Inst::ic_get(Operand::Reg(1), Operand::Reg(2)));
let m = lower_ok(&f);
assert_eq!(m.bytecode.len(), 4);
assert_eq!(m.bytecode.len(), 9);
assert_eq!(opcode::opcode(m.bytecode[0]), OpCode::IC_GET_PROP);
assert_eq!(opcode::rd(m.bytecode[0]), 0);
assert_eq!(opcode::a(m.bytecode[0]), 1);
assert_eq!(opcode::b(m.bytecode[0]), 2);
assert_eq!(m.bytecode[1..], [0, 0, 0]);
assert_eq!(m.bytecode[1..], [0; oxide_bytecode::opcode::IC_EXT_WORDS]);
}
#[test]