[PATCH] D105836: [AMDGPU] Add TII::isAmbientPhysRegUse() to allow VOP rematerialization

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz added a comment.

I think it would be a lot better to add the concept of a "rematerializable" physical register.  I think that currently physical registers are considered volatile, unless they are constant, but there was some talk a while back about refining the classification to allow exactly this sort of thing.


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  https://reviews.llvm.org/D105836/new/

https://reviews.llvm.org/D105836