debug table

Author: mikebo93

chapter_compiler_frontend/Intermediate_Representation.md

@@ -51,3 +51,14 @@ source programs and generating optimized compiled code. Table
 different IR types. It is important to design IR structures carefully,
 considering the specific requirements of the compiler's design.
 
+:::: center
+:::
+| IR Structure  | Characteristics                       | Examples |
+| --------------| --------------------------------------| ----------------------------------------------
+| Linear IR     | Based on linear code                  | Stack machine code, three-address code |
+| Graphical IR  | Based on graphs                       | Abstract syntax tree, directed acyclic graph |
+| Hybrid IR     | Based on both graphs and linear code  |LLVM IR |
+:label:`ch06/ch06-categorize`
+: Types of IRs
+:::
+::::