[PATCH] D119305: [AArch64][LoadStoreOptimizer] Make sure physical registers used by renamable undef are not picked as register to rename.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Probably the code printing the "Rename register used between paired instruction" diagnostic should ignore undef use; such uses don't use the value in any meaningful way.

For reference, the code in LiveRegUnits considers `isDef()` a write, and `readsReg()` a read.


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  https://reviews.llvm.org/D119305/new/

https://reviews.llvm.org/D119305