[PATCH] D84463: [LegalizeTypes] Teach DAGTypeLegalizer::GenWidenVectorLoads to pad with undef if needed when concatenating small or loads to match a larger load

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> On almost all targets, if N is small, reading N bytes from a dereferenceable pointer with align N is safe, even if the known dereferenceable bytes is less than N, due to the way memory allocation works. We do this in a few places, I think?

Err, I guess you know that.  Yes, it's depending on the alignment here.

It might be a good idea to explicitly call this out on the line where we compute LdAlign.


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https://reviews.llvm.org/D84463