[PATCH] D73475: [X86] Make sure we do not clobber RBX with mwaitx when used as a base pointer.

[pierre gousseau via Phabricator via llvm-commits]

pgousseau added a comment.

In D73475#1843805 <https://reviews.llvm.org/D73475#1843805>, @craig.topper wrote:

> Is this subject to the same problem as PR42064?


Thanks for pointing this issue, yes I believe this change will have the same problem in cases where stack realignment occurs after mwaitx pseudo instruction is generated.
If I understand the conclusion of the PR is that the decision to save/restore base pointer needs to be done after PEI? I will try that approach.


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https://reviews.llvm.org/D73475