ShawnZhong added a comment.

Thanks for the quick reply and the reference on the C standard!

On the C++ side, Section C.1.8 specified that `int` bit-fields are signed:

> Change: Bit-fields of type plain int are signed.
> Rationale: Leaving the choice of signedness to implementations could lead to 
> inconsistent definitions of template specializations. For consistency, the 
> implementation freedom was eliminated for non-dependent types, too.
> Effect on original feature: The choise is implementation-defined in C, but 
> not so in C++.

Implementation-wise, I'll see what I can find in CodeGen on whether `int` 
bit-fields are signed for C


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D131255/new/

https://reviews.llvm.org/D131255

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