Path: utzoo!attcan!uunet!mcsun!cernvax!rbt
From: rbt@cernvax.UUCP (roberto divia)
Newsgroups: comp.os.os9
Subject: Re: Passing parameters by registers is bad use?!?!?
Keywords: C compiler, parameter passing
Message-ID: <2823@cernvax.UUCP>
Date: 30 Sep 90 13:57:43 GMT
References: <2820@cernvax.UUCP> <3117@mcrware.UUCP> <3552@rwthinf.UUCP>
Organization: CERN, European Laboratory for Particle Physics
Lines: 16

In article <3552@rwthinf.UUCP> krischan@truth.UUCP (Christian Engel) writes:
>In article <2820@cernvax.UUCP> rbt@cernvax.UUCP (roberto divia) writes:
>>2) bigger is the data area used by the code is and easier is to have a
>>   cache miss (this in case of processors with data caches).
>Now, that's too high for me. Why should the chance of cache miss increase
>in passing parameters via stack?

Simply because they will HAVE to be store in the data cache (this is done
during the PUSH), removing other lines from the cache itself, lines that
will have to be reloaded in case of new references. The data cache works
normally as function of the "region" of the data used by the program. Stack
references will exit from this region, increasing the number of cache misses...-- 
|   Roberto Divia`      | Love at  first sight  is one of the greatest |
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|  CERN :  European Laboratory for Particle Physics,  1211  Geneva  23 |
|  Switzerland (CH)                                                    |