[PATCH] D137542: [AMDGPU] Use aperture registers instead of S_GETREG

[Pierre van Houtryve via Phabricator via llvm-commits]

Pierre-vh added a comment.

In D137542#3917196 <https://reviews.llvm.org/D137542#3917196>, @foad wrote:

>> do we have to change the RC of the src_shared/private_base register to 64 bit?
>
> Yes that sounds right.
>
>> (ideally it should be available for both, no?)
>
> That would be useful bu apparently it's not how the hardware works. I guess it gives you the 32 low bits which is not very useful because it will always be 0 for src_*_base and -1 for src_*_limit.

Which RegisterClass should I use for it? Just SGPR64?


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