From 5a647ff9ca6b2d165e6d804e87dc390440dcd600 Mon Sep 17 00:00:00 2001
From: willson walter <whtoo@qq.com>
Date: Tue, 5 Dec 2023 16:29:02 +0800
Subject: [PATCH] - add baseline code - add title for ep20

---
 ep20/README.md | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/ep20/README.md b/ep20/README.md
index 79297c0..77e04a2 100644
--- a/ep20/README.md
+++ b/ep20/README.md
@@ -1,3 +1,35 @@
+# 以`CFG`和`地址化`为中心的编译构造实作
+
+## 测试样例源码
+
+``` CPP
+
+int dec1(int x) {
+    return x - 1;
+}
+
+int main() {
+    int i = 10;
+    while(i > 0) {
+        if (i > 5) {
+            print(i);
+            if(i == 7) {
+                return 7;
+            }
+        }
+
+        print("break");
+
+        i = dec1(i);
+    }
+
+   return 0;
+}
+
+
+
+```
+
 ## 编译步骤流程图
 
 ```mermaid
@@ -26,6 +58,7 @@ graph LR
 - [x] 编译到[ep18](..%2Fep18)的VM
 - [x] 扩展[ep18](..%2Fep18)的VM支持更丰富的[指令实现](../ep18/VM_Design.md)
 - [x] 线性化IR和CFG
+- [x] 跳转优化（空标签和重复跳转)
 
 ### 线性化IR
 我们的IR本质上是tree模式的，这样一来我们的线性化实际上延迟到了指令生成时。
@@ -34,7 +67,6 @@ graph LR
 
 ### CFG
 
-
 - Original CFG
 ```mermaid
 graph TD