Re: Is global optimization worth it?

lance.delahaye@xtra.co.nz (Lance) writes:
> I'm starting a compiler project. I am wondering if it is worth
> ignoring global optimisations for a pascal-type scoped language. About
> how much optimisation gain is there to be had there? If its more than
> about a third, I probably shouldn't ignore it, but it would simplify
> my life quite a bit if I could.


I'll try to avoid all the complexity, and just suggest two things.


First, look at the assembly code your compiler produces for typical
programs without any optimization. Then you can get a good idea of
what improvements are possible.


Second, don't forget to consider your priorities! How important is
speed for you, really? Don't just say "very" -- honestly decide how
much it would be worth to double (triple... quadruple...) the speed
of all programs your compiler outputs.




-Lex

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