[Bug target/20288] AVR assignment of a value through a 16 bit pointer generates out of order code
bjoern dot m dot haase at web dot de
Fri Mar 4 19:38:00 GMT 2005
------- Additional Comments From bjoern dot m dot haase at web dot de 2005-03-04 19:38 -------
In reply to comment #10.
I agree with you JÃ¶rg, it is not a dramatic loss if you have a bit less
efficient use of volatile pointers :-) and IMHO anybody in the avr community
could live with it. I think it's possibly rather a question of style.
I'd like to suggest that the explicit use of a macro while sticking to the
standard convention for use of the volatile keyword might make it more
transparent *why* and *that* an explicit treatment is required for 16 bit
registers. Imagine the case of a person who is reading code written by someone
else. Just seeing the "volatile" keyword would not make the possible danger
Maybe the "volatile" solution makes it easier for some programers and I agree
with anybody that using macros tends to turn the code uglier. Possibly,
however, there is the danger that one makes "things easier than they are in
With either approach, the user will be required to be avare of the possible
problem and would have to handle the code accordingly. My personal opinion is:
If there is a pitfall with 16 bit registers, write code that names it by it's
Anyway I could also live with a solution that patches the compiler.
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