[coldfire-gnu-discuss] Control deferred writes?

[Oliver Betz]

42Bastian wrote:

(I sent a direct reply by accident, now to the list as intended)

> > can I tell gcc not to defer writes, possibly only to certain 
> > variables?
> 
> No, not at all. If you need such, write assembly.
> 
> The compiler has no idea of the underlying hardware.
> It might schedule instructions if it knows the CPU core, but not w.r.t.
> bus timing.

I wasn't asking for such optimizations, but I find many deferred 
writes where I can't see any benefit.

If the variable will be be written at some later time *) anyway, why 
does the compiler delay this write at all, IOW what is the intended 
benefit?

It doesn't require less code, and it doesn't save execution time as 
far as I see.

Oliver

*) e.g. "volatile". gcc of course respects "6.7.3 Type qualifiers" 
(including footnote 114) of ISO/IEC 9899:1999.
-- 
Oliver Betz, Muenchen