[PATCH] D69206: [AMDGPU] Select AGPR in PHI operand legalization

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec added a comment.

Also note, if such PHI survives until RA, it will go into PHI elimination where it will be converted into a COPY. Then it has to be handled by the copyPhysReg(), which is a subject to register scavenging and not very efficient anyway. We have much better chances to deal with it earlier if that is a well formed PHI.


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https://reviews.llvm.org/D69206