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

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz added a comment.

In D105836#2877775 <https://reviews.llvm.org/D105836#2877775>, @arsenm wrote:

> We specifically do not want anything trying to manage the value of the register here. It's a predicate register and we want the value to be whatever it happens to be at that point. If the predicate was on for a lane at the def, it's fine if that bit is off at the use. The inverse would be an invalid situation to begin with

So you don't care if `exec` has a different value at `OldIdx` and `UseIdx`?


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