AaronBallman wrote:

> > @zahiraam @AaronBallman a different option would be to add a signed vs 
> > unsigned storage option to the `OPTION` and `BENIGN_ENUM_LANGOPT` macros so 
> > we can store negative enumerations safely
> 
> I think I would prefer this solution. We need to be able to set the 
> evaluation method to a value (-1) when it can't be known from the target or 
> when the value of `ffp-eval-method` is inconsistent with the target.

Could we shift all the values, so `FEM_Indeterminable` is `0`?

https://github.com/llvm/llvm-project/pull/137661
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