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From: Rainer Aigner <aigner@newtec.de>
Subject: Re: Take controll of the assignment operator
Date: 2000/04/12
Message-ID: <38F437C5.D525C847@newtec.de>#1/1
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Date: 2000-04-12T00:00:00+00:00
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Robert A Duff wrote:
> 
> "Rainer Aigner Tel. XXXX" <aigner@newtec.de> writes:
> 
> > Up to here everythings fine.
> > Now, my question: How can I make sure that the compiler uses the right
> > assembler for load and store operations?
> 
> I'm not sure exactly what you're asking, but you might want to look up
> the Atomic and Volatile pragmas.
> 
> - Bob
Hello Bob,

all right I thougth of that too, but maybe I rearange the question:

I got two types one is 8-Bit and the other is 16-Bits wide.
I make two variables, one of eache type, and tell the compiler where
they are located (eg. registers).

Now I make a simple read from both variables to a temp variable of each.
(for modify and write back).

And I want to make sure, that a read with the 8-bit type is performed by
a "load byte", 
and the 16-bit type by a "load halfword" assembler statement.

The pragmas You told me, would do (correct me if I didn't get right)
volatile: make sure that the compiler doesn't opimize them out. eg. two
consecutive writes and a subsequent read.

atomic: Is trying to perform the load and store in a single assembler
statment. That okay, but it's only half the rent.
   In addition to this I want that the compiler thates care of the size.

unfortunatly the compiler I have to use doesn't work with the pragma
volatile (still some bug).

thank You for the answer.

cu
rainer
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