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SubjectRe: Compilers and RCU readers: Once more unto the breach!
Date
Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

> > Additionally, what about the following code?
> >
> > char *x = y ? z : z;
> >
> > Does that extend a dependency chain from z to x? If so, I can imagine a
> > CPU breaking that in practice.
>
> I am not seeing this. I would expect the compiler to optimize to
> something like this:
>
> char *x = z;

Why? What if y has a potential side-effect (say it makes a function call)?

David


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