DianQK added a comment.

In D157227#4564817 <https://reviews.llvm.org/D157227#4564817>, @nikic wrote:

> Removing noundef makes no sense to me, because the return value is noundef 
> even under fno-exceptions. If we remove something, it should be the nonnull 
> attribute, because that's what's actually being violated.

Return null on nonnull is poison. So I can also think that the noundef 
attribute is violated. I think the reason for keeping nonnull is to match the 
semantics of `operator new`. But that probably doesn't make sense either.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157227/new/

https://reviews.llvm.org/D157227

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