[easyThrowaway]

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.

[measurablefunc]

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.