Re: Loop jamming!?

"Stanley Chow" <schow@nortel.ca>
21 Jul 1997 10:01:20 -0400

          From comp.compilers
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[3 later articles]
| List of all articles for this month |
From: "Stanley Chow" <schow@nortel.ca>
Newsgroups: comp.compilers
Date: 21 Jul 1997 10:01:20 -0400
Organization: Bell-Northern Research Ltd.
References: 97-07-089
Keywords: optimize

Christopher Glaeser <cdg@nullstone.com> wrote:
>> In the extreme case, the slower loop is not slowed down any more
>> by merging another loop with it.
>
>Not true. In the extreme case, performance can actually decrease. This
>can occur, for example, when the fusion of the loops cause cache
>conflicts that were not present when the loops are run separately.

Of course, both cases can be true (but for different extreme cases).

--
Stanley Chow; schow@nortel.ca, (613) 763-2831
Nortel/BNR, PO Box 3511 Station C, Ottawa, Ontario
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