Re: Is there a cost in switching AMODEs?
- From: bdissen@xxxxxxxxxxxx (Binyamin Dissen)
- Date: 30 May 2007 11:33:17 -0700
On Wed, 30 May 2007 10:39:48 -0700 Edward Jaffe <edjaffe@xxxxxxxxxxxxxxxxxxx>
wrote:
:>Binyamin Dissen wrote:
:>> :>In my experience, excessive switching of addressing mode is quite
:>> :>expensive. I suspect it's because the entire pipeline must be flushed.
:>> I didn't see that in the POPs.
:>AFAIK, the Principles of Operation does not discuss processor pipeline
:>considerations for any instruction. There is some cursory information
:>here and there regarding instruction prefetch. That's about it.
Why would an AMODE change require a pipline flush? It doesn't branch anywhere.
The current pipline should be valid.
--
Binyamin Dissen <bdissen@xxxxxxxxxxxxxxxxxx>
http://www.dissensoftware.com
Director, Dissen Software, Bar & Grill - Israel
Should you use the mailblocks package and expect a response from me,
you should preauthorize the dissensoftware.com domain.
I very rarely bother responding to challenge/response systems,
especially those from irresponsible companies.
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