Decompilation does not preserve semantics. You generally do not know whether the code from the decompiler will be compiled to semantically equivalent binary that you initially decompiled.
My test harness loads up the original DLL then executes that in parallel against the converted code (differential testing). That closes the feedback loop the LLM needs to be able to find and fix discrepancies.
I'm also doing this on an old Win32 DLL so the task is probably much easier than a lot of code bases.
Many of the decompiled console games of the '90s were originally written in C89 using an ad-hoc compiler from Metrowerks or some off-branch release of gcc-2.95 plus console specific assemblers.
I willing to bet that the decompiled output is gonna be more readable than the original source code.
Not related to what I was saying. Compilation is a many-to-one transformation & although you can try to guess an inverse there is no way to guarantee you will recover the original source b/c at the assembly level you don't have any types & structs.
