Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!vette!brooks
From: brooks@vette.llnl.gov (Eugene Brooks)
Newsgroups: comp.arch
Subject: Re: gather/scatter hardware
Keywords: gather scatter
Message-ID: <22357@lll-winken.LLNL.GOV>
Date: 22 Mar 89 20:51:30 GMT
References: <180@qusunj.queensu.CA>
Sender: usenet@lll-winken.LLNL.GOV
Reply-To: brooks@maddog.llnl.gov (Eugene Brooks)
Organization: Lawrence Livermore National Laboratory
Lines: 11

In article <180@qusunj.queensu.CA> levisonm@qucis.queensu.CA (Mark Levison) writes:
>
>     Does anyone have a good short explanation of how gather/scatter
>hardware (such as in the Cray - XMP) works?
You have a vector of integers which are interpreted as addresses,
or indexes for a fixed array address and you crank these through a pipe
which issues loads or stores using another vector register as the source
or destination operand.  A very useful capability for some applications.


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