[PATCH] D139732: [AMDGPU] Add pass to rewrite partially used virtual superregisters after RenameIndependentSubregs pass with registers of minimal size (WIP)

[Valery Pykhtin via Phabricator via llvm-commits]

vpykhtin added a comment.

In D139732#3985458 <https://reviews.llvm.org/D139732#3985458>, @arsenm wrote:

> Can you add some dedicated MIR and IR tests that this improves? I've thought about hacking around some allocation failures by doing something similar. My assumption has been unnecessarily wide register uses should have been broken down before this point

I don't know if this improves something at this point apart from that I see less spills at spill-vgpr.ll. I would like to turn off subreg liveness tracking for register pressure calculation because LiveIntervals has bug related to subreg liveness that isn't easy to fix. I'm afraid though I would need more allocatable register classes for this purpose.


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