Re: Removing ARCNET stuffs

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

David Holland skrev den 2015-06-03 07:56:
>   > PCC, to the best of my knowledge is still in the [very early] planning
>   > stages.  One of its design choices would be to go pure SSA.  Another
>   > option, closer to GCC (RTL), would be to retain existing code-gen
>   > passes.  Tough choices.
>
> I'm not sure why it's such a big deal, except that everything in gcc
> is a big deal because gcc is such a mess inside.
>
> Moving an existing representation to SSA just requires adding phi
> nodes to the representation, writing a check pass to enforce the
> single assignment property, and updating existing passes to maintain
> the property -- in a language without proper algebraic data types this
> is a bigger deal than otherwise but it does not seem like a
> particularly major undertaking. Unless the representation is totally
> wrong in other ways that need to be rectified first.
SSA representation was added to pcc in 2008.
>   > > backend is an orthogonal issue.
>   >
>   > I'm being fast and loose.  My reading of the code was that debug info
>   > was being generated by the back of the front end (very roughly
>   > "gimplify" in this diagram of GCC
>   > https://gcc.gnu.org/projects/tree-ssa/#ssa).   It was pretty much hard
>   > wired printfs, and explained to me why "-g -O" wasn't supported.
>
> printfing from the back of the front end is definitely "totally wrong
> in other ways that need to be rectified first" :(
Hm, I may be missing something, but what is wrong?
Where should you print it out otherwise?

-- Ragge