[PATCH] D93715: AMDGPU: Don't fold AGPR copy pairs that need a temp VGPR

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D93715#2477411 <https://reviews.llvm.org/D93715#2477411>, @kerbowa wrote:

> I'm working on eliminating some AGPR->VGPR->AGPR copies which commonly cause problems in loops where the VGPR is considered live across iterations by the register allocator even if the VGPR copy should be sunk. Why do we need this temp VGPR?

Because you can't directly copy between AGPRs (or directly from SGPR to AGPR)


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https://reviews.llvm.org/D93715