Re: Software Pipelining

"Armel" <armelasselin@hotmail.com>
Wed, 24 Sep 2008 10:52:10 +0200

          From comp.compilers
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[6 earlier articles]
Re: Software Pipelining kamalpr@hp.com (kamal) (2008-09-10)
Re: Software Pipelining johnhull2008@gmail.com (johnhull2008) (2008-09-11)
Re: Software Pipelining plfriko@yahoo.de (Tim Frink) (2008-09-16)
Re: Software Pipelining plfriko@yahoo.de (Tim Frink) (2008-09-16)
Re: Software Pipelining pertti.kellomaki@tut.fi (Pertti Kellomaki) (2008-09-17)
Re: Software Pipelining cdg@nullstone.com (Christopher Glaeser) (2008-09-21)
Re: Software Pipelining armelasselin@hotmail.com (Armel) (2008-09-24)
Software pipelining napi@rangkom.MY (1991-07-04)
Re: Software pipelining pardo@gar.cs.washington.edu (1991-07-19)
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From: "Armel" <armelasselin@hotmail.com>
Newsgroups: comp.compilers
Date: Wed, 24 Sep 2008 10:52:10 +0200
Organization: les newsgroups par Orange
References: 08-08-072 08-08-086 08-08-092 08-09-060 08-09-079 08-09-111
Keywords: optimize
Posted-Date: 24 Sep 2008 12:12:52 EDT

"Christopher Glaeser" <cdg@nullstone.com> a ecrit
>> Even though I understand that this is an example, I still have the
>> feeling that with just a single functional unit, the benefits of
>> pipelining are marginal,
>
> Actually, the benefits of software pipelining can be significant, even
> for a single functional unit, if that functional unit has a multistage
> pipeline. Assuming the number of iterations is sufficiently large to
> mask the prologue and epiloque, the number of cycles required to
> execute any given iteration doesn't really matter. The key is to
> minimize the number of cycles needed to start each successive
> iteration, otherwise known as the minimum iteration interval (MII).


Yes, sure it (is/was) applied very often for unrolling various byte/small
data handling, when handling each item individually costs less than or is
similar to the prologue/epilogue of the loop!


Regards
Armel


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