[Beowulf] Re: the comparison between OpenMP and MPI
lindahl at pbm.com
Tue May 22 13:50:41 PDT 2007
On Mon, May 21, 2007 at 06:12:11PM +0100, Tim Cutts wrote:
> When I looked at the code, I wasn't
> surprised. At first glance, my initial reaction was the same as the
> compiler's; "Oh, that's dead code, we can eliminate that". Wrong!
> It was possible for the code to have an effect, but it was extremely
> indirect, and I didn't blame the compiler for screwing up!
I don't see why you weren't surprised. If "out" was never assigned, it
would be dead code, but "out" is assigned. And though "in" and "out"
are aliasing each other, they are of the same type.
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