[PATCH] D63225: AMDGPU: Fold readlane from copy of SGPR or imm

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec requested changes to this revision.
rampitec added a comment.
This revision now requires changes to proceed.

This cannot work as written, at least readlane part. Maybe readfirstlane can, providing skip is always inserted around and def is in the same block. Otherwise it needs to be a virtual register and SSA.


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https://reviews.llvm.org/D63225