[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?


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  https://reviews.llvm.org/D84463/new/

https://reviews.llvm.org/D84463