[Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102464

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's related optimizations in convert () which should ideally move to
match.pd