From: Alexander Ponga
Subject: Alternative Low-Level Lisp Implementations
Date: 
Message-ID: <CEsuzw.B3M@world.std.com>
   Are there any lisp implementations out there (esp for PC) that
implement or can implement their low-level lisp stuctures in
alternative ways such for example doubly linked lists
an implementation for which certain usually considered slow
lisp operations would run faster under although this would
of course be transparent to the user of course.  Also
are their any implementations or implementations schemes that
are similarly much more efficient but user transparent for
processing lisp instructions in situations where heavy consing
is unavoidable.  I am asking because I may need to do some
pretty heavy and strange processing tasks for which
such alternative implementations might be required.

   Yes I know about destructive list operations but they will
not solve all of my problems by far!!

   Any information would be greatly appreciated.  Please
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