Re: PC-relative addressing vs I/D cache

From	MitchAlsup <MitchAlsup@aol.com>
Newsgroups	comp.arch
Subject	Re: PC-relative addressing vs I/D cache
Date	2012-04-10 12:59 -0700
Organization	http://groups.google.com
Message-ID	<27258884.1973.1334087966202.JavaMail.geo-discussion-forums@ynmf4> (permalink)
References	<jm14jh$6ul$1@dont-email.me> <jm16q8$ita$1@dont-email.me> <jm1h0s$g5r$1@dont-email.me> <m49e59-gie.ln1@ntp6.tmsw.no>

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On Tuesday, April 10, 2012 1:01:25 PM UTC-5, Terje Mathisen wrote:
> To make sense (from a cache hit view), PC-relative loads must load from 
> the I-Cache instead of the D-cache, and/or the cache must be a combined 
> I/D cache.

Not in an machine I ever built.

A PC-relative load may be several pages away from the instruction, and
might not even be in an executable page. No, the only sane thing is to 
load from the data cache and let cache consistency maintain the sanity
of the memory model.

Mitch

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PC-relative addressing vs I/D cache Noob <root@127.0.0.1> - 2012-04-10 13:12 +0200
  Re: PC-relative addressing vs I/D cache nedbrek <nedbrek@yahoo.com> - 2012-04-10 07:50 -0400
    Re: PC-relative addressing vs I/D cache Anders.Montonen@kapsi.spam.stop.fi.invalid - 2012-04-10 13:43 +0000
    Re: PC-relative addressing vs I/D cache Noob <root@127.0.0.1> - 2012-04-10 16:44 +0200
      Re: PC-relative addressing vs I/D cache Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-04-10 20:01 +0200
        Re: PC-relative addressing vs I/D cache MitchAlsup <MitchAlsup@aol.com> - 2012-04-10 12:59 -0700
          Re: PC-relative addressing vs I/D cache Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-04-10 22:34 +0200
            Re: PC-relative addressing vs I/D cache MitchAlsup <MitchAlsup@aol.com> - 2012-04-11 08:44 -0700
              Re: PC-relative addressing vs I/D cache "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-04-11 10:25 -0700
          Re: PC-relative addressing vs I/D cache Noob <root@127.0.0.1> - 2012-04-11 10:47 +0200
        Re: PC-relative addressing vs I/D cache Noob <root@127.0.0.1> - 2012-04-11 10:41 +0200
          Re: PC-relative addressing vs I/D cache nedbrek <nedbrek@yahoo.com> - 2012-04-11 06:51 -0400
          Re: PC-relative addressing vs I/D cache "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-04-11 07:26 -0700
      Re: PC-relative addressing vs I/D cache nedbrek <nedbrek@yahoo.com> - 2012-04-10 22:54 -0400
        Re: PC-relative addressing vs I/D cache Noob <root@127.0.0.1> - 2012-04-16 13:43 +0200
  Re: PC-relative addressing vs I/D cache "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-04-10 07:48 -0700

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