Compiler code optimization: AST vs. IR -

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, define ir 3-address code type representation (i realize 1 can mean ast representation well).

it understanding that, when writing best-practice compiler imperative language, code optimization happens both on ast (probably best using visitor pattern), , on ir produced ast. 

(a) correct?

(b) type of optimization steps best handled on ast before producing ir? (reference article/a list online welcome long deals imperative language) 

the compiler i'm working on decaf (which might know) has deep cfg (single) class inheritance; i'll add features not part of such type coercion. hand-coded (using no tools whatsoever). not homework; writing fun. 

(a) yes.

(b) constant folding 1 example; cse another; in fact expression evaluation. ir-phase optimizations more results flow analysis.


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