[PATCH] D84220: [IPSCCP] Fix a bug that the "returned" attribute is not cleared when function is optimized to return undef

Tue Jul 28 13:05:41 PDT 2020

efriedma added a comment.

> I'm not sure I understand the motivation. My problem is that if we replace the return values with undef, it should mean there is no use of the returned value of the function live anymore. What am I missing? Maybe provide the motivating example as a test case?

We use "returned" in codegen even if the value has no uses; see https://reviews.llvm.org/D64986 .

Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D84220/new/

https://reviews.llvm.org/D84220