complement in 11.11

notes/8.md

@@ -49,4 +49,19 @@ But Constant folding can be dangerous on cross-compilation (in precision).
 
 ### Dead Code Elimination
 
-## Global Optimization
+## Global Optimization
+
+It is not actually global but in control graph.
+
+In Basic Block, there are a few instructions (4-8). So only local optimization, it is not quite optimizable. There are many cases where the optimization can be performed through the entire CFG.
+
+## Dataflow Analysis
+
+* Local Dataflow Analysis
+* Global Dataflow Analysis
+
+Analysis of Reaching Definition
+
+Effect of an Instruction
+
+`IN[b]` and `OUT[b]`