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

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

I was stepping through that function myself after seeing the bug, and it wasn't clear to me why we are ok with reading more than the actual load size. Ie, we are only allowed to read <23 x float>, but we created a <16 x float> load + two <4 x float> loads right? Something later is guaranteed to reduce that to make sure we don't actually load the full <24 x float>?


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https://reviews.llvm.org/D84463