[PATCH] D141020: [X86][ABI] Clobber %RAX for preserve_allcc and preserve_mostcc CCs

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added a comment.

I took a look but fogot to comment. TBH, I know little about preserve_mostcc. I checked the existing test cases all of which declare void return with it. So is it not legal to return value with the CC? If we do not preserve rax, we probably have compatibility issue with pre-built code since it assumes rax is saved by callee.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D141020/new/

https://reviews.llvm.org/D141020