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Re: Common Lisp solved this problem 20 years ago

This page is part of the web mail archives of SRFI 77 from before July 7th, 2015. The new archives for SRFI 77 contain all messages, not just those from before July 7th, 2015.

"John.Cowan" <jcowan@xxxxxxxxxxxxxxxxx> writes:

> I assume you mean "must not affect the behavior, but may affect the
> performance" (= speed).  Unfortunately, you have to be intimately
> familiar with your CL implementation to know when declarations are
> useless, when they are critical to performance, and when they actually
> make things worse.

Yes, but I don't see any way around that problem.

It should be possible to guarantee that declarations never make
anything worse...