Re: Any use for Branch if Even/Odd ?

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Article #10897

#10897

From: Damon
Date: Sun, 13 Dec 1992 22:50

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In article <GJR.92Dec11231116@chamarti.ai.mit.edu> gjr@zurich.ai.mit.edu writes:
>Another place where it is useful is to test packed booleans.
>On most machines, the word containing the packed boolean would have to
>be masked, but the mask generation might take multiple instructions.
>Having branch-on-low-bit, you only need to shift before branching.

Nah.  Only `and with 1' and then use branch-on-zero.  One more
instruction.  There might be a delay for the result to come back from
the ALU if you can't interleave other instructions...

Damon
-- 
Damon Hart-Davis                          Internet: dhd@exnet.co.uk, d@hd.org

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References: <endecotp.723992157@cs.man.ac.uk> <MOSS.92Dec11172728@CRAFTY.cs.cmu.edu> <GJR.92Dec11231116@chamarti.ai.mit.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!warwick!uknet!edcastle!dcs.ed.ac.uk!exnet!dhd
From: dhd@exnet.co.uk (Damon)
Newsgroups: comp.arch
Subject: Re: Any use for Branch if Even/Odd ?
Message-ID: <Bz7zG0.9FM@exnet.co.uk>
Date: 13 Dec 92 22:50:23 GMT
References: <endecotp.723992157@cs.man.ac.uk> <MOSS.92Dec11172728@CRAFTY.cs.cmu.edu> <GJR.92Dec11231116@chamarti.ai.mit.edu>
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