Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ames!apple!rutgers!att!mcdchg!mcdphx!teroach.UUCP!dbk
From: dbk@teroach.UUCP (Dave Kinzer)
Newsgroups: comp.sys.amiga.tech
Subject: Re: A68k and Manx AS
Keywords: 68000 assembly
Message-ID: <10930@mcdphx.phx.mcd.mot.com>
Date: 21 May 89 17:40:49 GMT
References: <221@mindlink.UUCP> <262@xdos.UUCP> <8979@polya.Stanford.EDU> <87@estinc.UUCP> <10891@mcdphx.phx.mcd.mot.com>
Sender: listen@mcdphx.phx.mcd.mot.com
Reply-To: dbk@teroach.UUCP (Dave Kinzer)
Distribution: na
Organization: Motorola Microcomputer Division, Tempe, Az.
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In article <10891@mcdphx.phx.mcd.mot.com> (I) incorrectly write:
>   The subject is optimizing 68000 branch instructions for forward branches.
>
>   Fred suggests assuming short branches then converting to long as needed
>since once they are converted to long they will not need to be checked
>again.

  I go on to suggest that assuming long works out as well.  Fred Fish sent
mail explaining that there may exist cases (multiple branches near the
end of short branch range) that cannot be shortened considered individually,
but can be shortened if considered as a group.  Therefore, it is easier
to assume them all short, and lengthen only those that need it.  I
stand corrected.

   More evidence that no matter how well meaning, Usenet advice may be 
worth exactly what you pay for it.  ;-)

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