[PATCH] D112644: [AMDGPU] Fix global isel for kernels using agprs on gfx90a

Wed Oct 27 12:42:41 PDT 2021

arsenm added a comment.

In D112644#3091088 <https://reviews.llvm.org/D112644#3091088>, @rampitec wrote:

> In D112644#3091054 <https://reviews.llvm.org/D112644#3091054>, @arsenm wrote:
>
>> How was this breaking?
>
> LLVM ERROR: no registers from class available to allocate
>
> What happens `usesAGPRs()` does not see any agprs used and then the whole register budget is allocated to vgprs.

Wouldn't it work correctly after later getReservedRegs calls? I don't think we should be calling this before finalizeIsel?

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https://reviews.llvm.org/D112644