[PATCH] D79987: [DAG] SimplifyDemandedVectorElts Bug fix for rG7cb5a51f386d

Fri May 15 10:18:29 PDT 2020

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In D79987#2038738 <https://reviews.llvm.org/D79987#2038738>, @RKSimon wrote:

> Really we need to stop creating nodes inside getFauxShuffle - I'm going to see if we can do this without too many regressions.

Hi, Simon. I am wondering what benefits we can get from getFauxShuffle. Do we have a good example for it?
As I aware of, SimplifyDemandedVectorElts(...) is used to simplify a real SDNode using the information of DemandedVectorElts but It seems weird to simplify a Fauxshuffle.

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