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Path: utzoo!linus!decvax!microsoft!fluke!kurt
From: kurt@fluke.UUCP (Kurt Guntheroth)
Newsgroups: net.lang
Subject: Re: static links vs. displays
Message-ID: <770@vax2.fluke.UUCP>
Date: Wed, 19-Oct-83 12:11:08 EDT
Article-I.D.: vax2.770
Posted: Wed Oct 19 12:11:08 1983
Date-Received: Fri, 21-Oct-83 06:18:58 EDT
References: <2501@utcsrgv.UUCP>
Organization: John Fluke Mfg. Co., Everett, Wash
Lines: 14

[ Why are displays any better/faster/different than static links? ]

If your machine supports the right addressing modes, uplevel addressing is
faster with a display than it is with a static link.

To get to the activation record of the procedure n lexical levels above the
current function activation, you must perform n levels of indirection through
the static link.  With a display, you simply indirect (once) through the display
at the lexical level you want.  
-- 
Kurt Guntheroth
John Fluke Mfg. Co., Inc.
{uw-beaver,decvax!microsof,ucbvax!lbl-csam,allegra,ssc-vax}!fluke!kurt