Re: Simple retargetable compiler (maybe only local optimizations)

Uncle Noah wrote:
> I have been looking for some time for an easily (not GCC!) retargetable
> compiler, generating assembly code for RISC processor ISAs from ANSI C.
> This seems to be utopic since in most attempts the specification for
> the target processor is tightly integrated in the code generator (e.g.
> AST->IR->assembly). Since this is a very difficult problem in practice,
> we can exclude some of the hard stuff. Anyway, these are the
> requirements:
>
> 1. Compact (not obfuscated though!) machine description language.
> 2. Single file machine descriptions.
> 3. Support for simple register allocation (not necessarily Chaitin
> variation).
> 4. No (global) optimizations.
>
> The latter is very important; I'm interested in generating correct code
> for different instruction sets, BUT don't care about optimizations. If
> it look ugly, I will deal with it later.
>
> Any suggestions? LCC looks nice and jackcc has some nice options
> (http://jackcc.sourceforge.net) but neither scores all 4 requirements.


I would say lcc meets all four? Unless you don't like its
machine-independent optimisations. All machine-dependent optimisations
are in a 1-file md.


--T

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