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Re: [RFC] caar/cadr/cdar/cddr

From: Paul Eggert
Subject: Re: [RFC] caar/cadr/cdar/cddr
Date: Thu, 12 Jul 2012 09:53:13 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

On 07/12/2012 09:26 AM, Dmitry Antipov wrote:
> These are widely used

How widely?  I've always been leery about those
functions, myself.  Since this is a performance
improvement, how much does performance improve?

Quite possibly they're a win in the C implementation,
but I'm not sure they're worth adding bytecodes for.
We might want to save bytecodes for something more

Assuming they're needed, I vote for a clean
implementation of Fcaar etc. rather than tricky
ones involving loops.  Especially since the tricky
loops are wrong and will infinite-loop in some

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