[PATCH] D138766: [InstCombine] If loading from small alloca, load whole alloca and perform variable extraction

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> I'm not using vector for anything else here

All your testcases involve using the result as a vector?  That seems relevant.

> Also, we don't really have a way in LLVM IR to represent a shuffle with variable mask.

Not in a target-independent way, no.  Almost every target with a vector unit has some sort of variable shuffle intrinsic, but the semantics aren't consistent.


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