[PATCH] D118415: AMDGPU: Reserve v32 if we may need to copy between AGPRs on gfx908

[Christudasan Devadasan via Phabricator via llvm-commits]

cdevadas added a comment.

In D118415#3280633 <https://reviews.llvm.org/D118415#3280633>, @rampitec wrote:

> In D118415#3280314 <https://reviews.llvm.org/D118415#3280314>, @cdevadas wrote:
>
>> I guess disallowing direct agpr -> agpr copy for gfx908 early from instruction selection would be a better fix. I am anyway working on a patch to avoid direct sgpr -> agpr copies. In that way, we could avoid Scavenger altogether while lowering COPY instructions.
>
> Note though copies are created in many passes.

Ah, the copies during register coalescer can't be avoided. Never mind.


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