On Wed, May 20, 2015 at 02:18:37PM +0100, David Howells wrote:
> Paul E. McKenney <paul...@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)?
I was thinking of "y" as a simple variable, but if it is something more
complex, then the compiler could do this, right?
char *x;
y;
x = z;
Thanx, Paul
