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From: vhs@britesun.radig.de (Volker Herminghaus-Shirai)
Newsgroups: comp.arch
Subject: Re: bizarre instructions
Message-ID: <1991Feb23.173831.461@britesun.radig.de>
Date: 23 Feb 91 17:38:31 GMT
References: <9102210042.AA12291@ucbvax.Berkeley.EDU>
Organization: private site
Lines: 10

JBS@IBM.COM writes:
>        I would like an instruction which counts the number of ones in
>the binary representation of an integer but I find it hard to argue
>that this would be widely used.

It does seem to be widely used indeed; as far as I know the inmos transputer
T800 has this instruction, along with other instructions like inverting
the sequence of the bits in an int etc. I think those are used for
CRC calculation and picture processing, though I'm not sure about that.

-- 
Volker Herminghaus-Shirai (vhs@britesun.radig.de)
panic: 80x86! Trying to vomit...


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