[PATCH] Fix PR19657 : SLP vectorization doesn't combine scalar load to vector loads

[Raul Silvera]

Is it really the depth of the subtrees that is the fundamental issue? Or is it really the relative depths of the common uses? If the latter, this patch wouldn't be addressing the general case.

Without looking too deeply, would it be feasible to defer the insertion of the extractions after the whole tree has been vectorized? If that sounds potentially fruitful I can dig a bit more on that direction.

http://reviews.llvm.org/D3800