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Re: address@hidden: Speed of all-completions]

From: David Kastrup
Subject: Re: address@hidden: Speed of all-completions]
Date: 15 Jun 2004 13:28:29 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50

Andreas Schwab <address@hidden> writes:

> David Kastrup <address@hidden> writes:
> > Andreas Schwab <address@hidden> writes:
> >
> >> This is due to this change:
> >> 
> >>    (Ftry_completion, Fall_completions, Ftest_completion): Bind
> >>    case-fold-search to the value of completion-ignore-case when
> >>    checking completion-regexp-list.
> >> 
> >> I've checked in a fix that avoids the overhead of specbind when
> >> completion-regexp-list is empty.
> >
> > At the cost of being more expensive when it isn't.
> Why is it more expensive?  The check for CONSP (completion-regexp-list)
> has to be done anyway, and can be CSE'd by the compiler.

Because you are redoing the binding for every element in the loop,
while it is needed only once.

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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