Describe default optimization level.
@@ -578,8 +578,8 @@ ex100: func v
* `0` means only register allocator and machine code generator work
* `1` means additional code selection task. On this level MIR generator creates more compact and faster
code than on zero level with practically on the same speed
- * `2` means additionally common sub-expression elimination and sparse conditional constant propagation. This is
- valuable level if you generate bad input MIR code with a lot redundancy and constants. The generation speed
- on level `1` is about 50% faster than on level `2`
+ * `2` means additionally common sub-expression elimination and sparse conditional constant propagation.
+ This is a default level. This level is valuable if you generate bad input MIR code with a lot redundancy
+ and constants. The generation speed on level `1` is about 50% faster than on level `2`
* `3` means additionally register renaming and loop invariant code motion. The generation speed
on level `2` is about 50% faster than on level `3`
