AaronBallman wrote:

> > That's how I lean but I don't have a good idea for what the warning 
> > conditions would be. I don't think "warn on any float" is viable -- outside 
> > of a handful of edge cases, the function does what it says on the tin, 
> > right? And the edge cases aren't something we can catch statically in most 
> > cases, I believe.
> 
> Deprecation warning

That seems like a reasonable approach to me; GCC doesn't implement this builtin 
nor does MSVC, so I don't think we need it for compatibility with other 
implementations. 

https://github.com/llvm/llvm-project/pull/180885
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