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

[Anton Bikineev via Phabricator via llvm-commits]

AntonBikineev edited reviewers, added: lebedev.ri; removed: pengfei.
AntonBikineev added a comment.
Herald added a subscriber: StephenFan.

Roman, could you please take a look at it (or suggest a reviewer)?

(The context: we want to use the attribute for cold calls in Chromium/V8. Early experiments are quite promising (e.g. showed to improve the hot path by up to 2x)).


Repository:
  rG LLVM Github Monorepo

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

https://reviews.llvm.org/D141020