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Re: Ne(ish) IBM z196 synchronization instructions

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Date Thu, 08 Mar 2012 17:17:15 -0800
From "Andy (Super) Glew" <andy@SPAM.comp-arch.net>
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Subject Re: Ne(ish) IBM z196 synchronization instructions
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On 3/8/2012 9:39 AM, Terje Mathisen wrote:
> Andy (Super) Glew wrote:
>> On 3/7/2012 1:43 PM, MitchAlsup wrote:
>>> On Wednesday, March 7, 2012 1:00:20 PM UTC-6, Terje Mathisen wrote:
>>>> I have some problem figuring out the intended usage for the AND/OR/XOR
>>>> versions of this operation:
>>>
>>> XOR is useful for setting bits and resetting bits (from the same
>>> constant).
>> To get XOR the safely set and clear different bits, you have to know the
>> prior state.
>
> Exactly, it is hard to figure out a nice usage scenario for the existing
> logical versions.

Some simple checksums are simple XORs. Without shifting.

This can be parallelized.

Hmm, a one time pad may simply XOR. Or perhaps a step in breaking some 
crypto is applying lots of XORs...

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Thread

Ne(ish) IBM z196 synchronization instructions "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-03-06 20:20 -0800
  Re: Ne(ish) IBM z196 synchronization instructions "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-03-07 05:43 -0800
    Re: Ne(ish) IBM z196 synchronization instructions "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-03-07 07:00 -0800
      Re: Ne(ish) IBM z196 synchronization instructions nmm1@cam.ac.uk - 2012-03-07 15:25 +0000
      Re: Ne(ish) IBM z196 synchronization instructions "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-03-09 11:05 -0800
  Re: Ne(ish) IBM z196 synchronization instructions Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-03-07 20:00 +0100
    Re: Ne(ish) IBM z196 synchronization instructions MitchAlsup <MitchAlsup@aol.com> - 2012-03-07 13:43 -0800
      Re: Ne(ish) IBM z196 synchronization instructions "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-03-08 09:08 -0800
        Re: Ne(ish) IBM z196 synchronization instructions Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-03-08 18:39 +0100
          Re: Ne(ish) IBM z196 synchronization instructions Nomen Nescio <nobody@dizum.com> - 2012-03-08 22:33 +0100
          Re: Ne(ish) IBM z196 synchronization instructions "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-03-08 17:17 -0800
          Re: Ne(ish) IBM z196 synchronization instructions MitchAlsup <MitchAlsup@aol.com> - 2012-03-09 08:19 -0800
            Re: Ne(ish) IBM z196 synchronization instructions Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-03-09 17:45 +0100
    Re: Ne(ish) IBM z196 synchronization instructions jgk@panix.com (Joe keane) - 2012-03-09 20:30 +0000
      Re: Ne(ish) IBM z196 synchronization instructions MitchAlsup <MitchAlsup@aol.com> - 2012-03-09 13:10 -0800

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