nikic wrote:

> > Can the implementation of foldFBinOpOfIntCastsFromSign be simplified to use 
> > nneg instead of KnownBits after this change?
> 
> yeah we could. Should I do a survey of existing folds first to ensure we 
> don't incorrectly keep flags (like with `trunc nuw/nsw`) before integrating 
> too deeply?

I don't think this is important for uitofp nneg, mainly because we only have 
very few folds for it, so there's just not a great deal of potential for things 
to go wrong...

https://github.com/llvm/llvm-project/pull/88299
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