Path: utzoo!attcan!uunet!husc6!uwvax!oddjob!uxc!uxc.cso.uiuc.edu!urbsdc!aglew
From: aglew@urbsdc.Urbana.Gould.COM
Newsgroups: comp.arch
Subject: Re: Execute instructions
Message-ID: <28200180@urbsdc>
Date: 26 Jul 88 12:47:00 GMT
References: <787@amethyst.ma.arizona.edu>
Lines: 9
Nf-ID: #R:amethyst.ma.arizona.edu:787:urbsdc:28200180:000:407
Nf-From: urbsdc.Urbana.Gould.COM!aglew    Jul 26 07:47:00 1988


..> Machines that have EXECUTE and EXECUTE DOUBLE instructions.

Gould Powernodes have EXM (Execute Memory) and EXR (Execute Register)
instructions; EXR has variant EXRR (Execute Register Right), for the
second half of a pair of 16 bit instructions.
    I just used an EXM, for an I/O instruction that only had a fixed
address specifier. In general, you try to avoid them, because they
are relatively slow.