[PATCH] D156358: [AArch64] Do not unnecessarily spill LR because of @llvm.returnaddress

[Ahmed Bougacha via Phabricator via llvm-commits]

ab added a comment.

We tried to address this problem by adding an `XPACuntied` pseudo, only selecting that instead of the real instruction, and later (after regalloc, which is now unburdened by the tied nature of XPAC, like you're discussing) expanding it to add the mov if necessary:

  https://github.com/ahmedbougacha/llvm-project/commit/7924c7d75ae0015a9fd9786a580b10b2190bccc6

@atrosinenko do you want to try out that patch, see if it helps?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D156358/new/

https://reviews.llvm.org/D156358