[fpc-devel] volatile variables

Vinzent Höfler JeLlyFish.software at gmx.net
Tue Jun 28 20:36:13 CEST 2011

On Tue, 28 Jun 2011 18:11:29 +0200, Hans-Peter Diettrich  
<DrDiettrich1 at aol.com> wrote:

> I think that you should give at least an example, where instruction  
> reordering makes a difference. Neither a compiler nor a processor is  
> allowed to reorder instructions in a way, that breaks the def/use  
> (produce/consume...) chain (see SSA - Single Static Assignment).

Well, yes. But multiple processors are actually allowed to do that.

That's why the double-lock idiom for Singletons is bound to break on


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