[PATCH] D120953: [AArch64][SelectionDAG] Supports unpklo/hi instructions to reduce the number of loads

[Allen zhong via Phabricator via llvm-commits]

Allen added a comment.

In D120953#3374916 <https://reviews.llvm.org/D120953#3374916>, @paulwalker-arm wrote:

> By directly supported I mean those which are legal and thus have isel patterns. Which I think boils down to:
>
>   

Thanks very much, this version I firstly fix the crash as you mention, and this version only play as the beginning of such optimisation.

If you agree, then I'll refact with your advice on the next version (**it is safest to exclude all scalable vector extending loads/truncating stores
and then selectively enable those which we directly support.** ), and add more cases to guard them.


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https://reviews.llvm.org/D120953