On Wed, Oct 19, 2016 at 01:11:31PM +0200, Richard Biener wrote:
> For C++ these kind of warnings trigger whenever abstraction penalty
> is removed. Like the typical
>
> template <int i> foo () { if (i) { <code> } }
>
> triggering for a hypothetical -Wdead-code for i == 0. The kernel
> is known for its "C" abstraction stuff and I can believe that
> such -W flag would trigger for cases where abstraction is removed.
Sure, we very much rely on dead code elimination and constant
propagation all over the place. I was mostly thinking about the specific
case where it was triggered by alias analysis. I'm not sure how often
we'd trigger that.
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