Re: Loop jamming!?

Sven <sven@customized.com>
13 Jul 1997 11:26:55 -0400

          From comp.compilers
Related articles
Loop jamming!? wjhung@csie.nctu.edu.tw (1997-06-24)
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Re: Loop jamming!? joelw@rsn.hp.com (Joel Williamson) (1997-06-30)
Re: Loop jamming!? sven@customized.com (Sven) (1997-07-13)
Re: Loop jamming!? n8tm@aol.com (1997-07-16)
Re: Loop jamming!? cdg@nullstone.com (Christopher Glaeser) (1997-07-18)
Re: Loop jamming!? schow@nortel.ca (Stanley Chow) (1997-07-21)
Re: Loop jamming!? cdg@nullstone.com (Christopher Glaeser) (1997-07-22)
Re: Loop jamming!? n8tm@aol.com (1997-07-27)
Re: Loop jamming!? genew@netcom.com (1997-07-28)
[6 later articles]
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From: Sven <sven@customized.com>
Newsgroups: comp.compilers
Date: 13 Jul 1997 11:26:55 -0400
Organization: Sven
References: 97-06-089
Keywords: optimize

> I want to ask a question about compiler optimization.
> Is there anyone that understands the keyword "loop jamming".
> Can you give me the definition (and a example if you can)?
> Thanks for your help :)


A search for "loop jamming" (also called fusion) in AltaVista,
yielded:


http://www.ontek.com/mikey/current.html


"The idea is to combine adjacent loops which loop over the same range of
the same variable."


http://happy.dt.uh.edu/~hu/4328/note.html


"If there are two loops with no data dependencies adjacent to one
another, push them together."


http://www.bme.jhu.edu/programs/courses/580.483/opt.techniques.html


"Programmers often encounter two or more independent, vectorizable loops
with the same iteration count. By combining two or more of these loops
into one vector loop, loop control overhead can be reduced."
--

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