Re: Register file splits, a new look.

From	MitchAlsup <MitchAlsup@aol.com>
Newsgroups	comp.arch
Subject	Re: Register file splits, a new look.
Date	2012-02-28 08:54 -0800
Organization	http://groups.google.com
Message-ID	<27947054.353.1330448092174.JavaMail.geo-discussion-forums@ynca15> (permalink)
References	(3 earlier) <ggtgp-9C575B.12220110022012@netnews.mchsi.com> <8314925.1151.1328905578623.JavaMail.geo-discussion-forums@vbbgq7> <ggtgp-61BB96.07254111022012@netnews.mchsi.com> <30413249.1062.1329438305740.JavaMail.geo-discussion-forums@ynlt17> <ggtgp-C1D373.14084217022012@netnews.mchsi.com>

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On Friday, February 17, 2012 2:08:42 PM UTC-6, Brett Davis wrote:
> There is also the issue that MAC instructions need three sources,
> forcing the vector pipe to be significantly different.

x86 AGEN is worse than MAC having 3 inputs (4 with non zero segment registers) and either 1 result or one other operand read in a different pipe stage.

> Both firms really really HATED adding three source instructions.

Some designers did hate it, others simply through it was the right thing to do.

Mitch

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Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-06 06:33 -0600
  Re: Register file splits, a new look. MitchAlsup <MitchAlsup@aol.com> - 2012-02-06 09:29 -0800
    Re: Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-07 07:08 -0600
  Re: Register file splits, a new look. torbenm@diku.dk (Torben Ægidius Mogensen) - 2012-02-09 11:19 +0100
    Re: Register file splits, a new look. MitchAlsup <MitchAlsup@aol.com> - 2012-02-09 12:12 -0800
      Re: Register file splits, a new look. "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-02-09 15:27 -0800
        Re: Register file splits, a new look. MitchAlsup <MitchAlsup@aol.com> - 2012-02-09 15:52 -0800
      Re: Register file splits, a new look. nmm1@cam.ac.uk - 2012-02-10 08:07 +0000
        Re: Register file splits, a new look. "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-02-10 06:37 -0800
      Re: Register file splits, a new look. Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-10 09:36 +0100
      Re: Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-10 12:22 -0600
        Re: Register file splits, a new look. MitchAlsup <MitchAlsup@aol.com> - 2012-02-10 12:26 -0800
          Re: Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-11 07:25 -0600
            Re: Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-16 17:17 -0600
            Re: Register file splits, a new look. MitchAlsup <MitchAlsup@aol.com> - 2012-02-16 16:25 -0800
              Re: Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-17 14:08 -0600
                Re: Register file splits, a new look. MitchAlsup <MitchAlsup@aol.com> - 2012-02-28 08:54 -0800
                Re: Register file splits, a new look. Brett Davis <ggtgp@yahoo.com> - 2012-02-28 19:33 -0600

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