[PATCH] D139673: [AMDGPU][SIFrameLowering] Mark VGPR used for AGPR spills as reserved

[Jeffrey Byrnes via Phabricator via llvm-commits]

jrbyrnes added a comment.

In D139673#3982757 <https://reviews.llvm.org/D139673#3982757>, @arsenm wrote:

> We should work towards eliminating the special case handling of "spilling" between AGPRs and VGPRs. The allocator now knows they have a common allocatable class and introduces new vregs and copies as needed. We only still have this special handling because it breaks an optimization that works by accident now (which is unused subregister related)

This is something I can explore after this patch -- for now there is an ask to resolve this into 5.5 so I think we will need this patch.


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