On Wed, Nov 20, 2013 at 10:31:38AM +0100, Richard Biener wrote:
> Aww ;) Nice improvement. Generally when I see this I always wonder
> whether we want to do this kind of stuff pre RTL expansion.
> 1st to not rely on being able to TER, 2nd to finally eventually
> get rid of TER.
>
> These patches are unfortunately a step backward for #2.
>
> As of the patch, do we have a way to query whether the target
> can efficiently broadcast? If so this IMHO belongs in generic
We don't. Perhaps if we'd add optab for vec_dup<mode> and mentioned
clearly in the documentation that it should be used only if it is reasonably
efficient. But still, even with optab, it would probably better to do it
in the veclower* passes than in the vectorizer itself.
Jakub
