AaronBallman wrote:

> Oh, wow, @AaronBallman, in adding a barrage of tests, I found some 
> pre-existing I found 3 existing bugs in `APFloat`
> 
> > > Generally LGTM though I did not check the implementation of the algorithm 
> > > very carefully. The results look correct to me in terms of the testing 
> > > changes, but I think there are some tests we should add:
> > > ```
> > > double bar = 0x10.1p0;
> > > ```
> > > 
> > > 
> > >     
> > >       
> > >     
> > > 
> > >       
> > >     
> > > 
> > >     
> > >   
> > > do we correctly round-trip that or do we still convert that to a decimal 
> > > value instead of the hex literal?
> > > Another question would be: do we have sufficient test coverage for some 
> > > of the odder floating-point formats like double double or all the tiny 
> > > floating point types for AI?
> > 
> > 
> > Good point. I'll add a barrage of corner case tests, compiling a list now, 
> > and I'll ping when they are pushed to the PR.
> 
> @AaronBallman, radix is not preserved in round-trip... that requires a bit 
> more surgery (need radix field in AST nodes, etc). Okay with you to post an 
> issue for that one, and follow-up with a separate PR, or do you think it's 
> worth adding to this PR?

A follow-up is totally fine, and thank you for offering to post an issue on it!

> Also, glad you pressed on wider test coverage, other that the existing bug 
> @efriedma-quic stressed in the comment above, I stumbled on another existing 
> bug in `toString`... I'll add another issue for that one, and follow up with 
> a separate PR to address, unless you think it makes sense to pack it all into 
> this PR.
> 
> What do you think: follow up with PRs, or get them into this one? (I already 
> added the three issues, FYI)

I think a follow-up for the existing bug in `toString()` is also reasonable.

https://github.com/llvm/llvm-project/pull/218471
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