[Bug target/113578] Incorrect sign printed for -nan on RISC-V

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113578

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Hmm, you could be right. It looks like the printf in Apple libc doesn't print
"-nan" even when not converting from float to double.

According to
https://developer.r-project.org/Blog/content/post/2020-11-02-apple-silicon.html
the Apple silicon NaN payloads are not propagated by default, but I don't know
if that means the signbit is not propagated. I assumed it meant they were
running in default NaN mode.