[PATCH] D109325: [ARM] Teach DemandedVectorElts about VMOVN lanes

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer added a comment.

Before I continue reading the rest, just wanted to check this:

> The class of instructions that write to narrow top/bottom lanes only demand the even or odd elements of the input lanes. Which means that VMOVNT; VMOVNB demands no lanes from the original input.

I don't follow the conclusion here that the VMOVNT; VMOVNB don't demand lanes from the original input, because we do read from the original input?


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https://reviews.llvm.org/D109325