[Bug target/100165] fmov could be used to zero out the upper bits instead of movi/zip or movi/ins with __builtin_shuffle and zero vector

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100165

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-11-12
     Ever confirmed|0                           |1

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Currently the trunk produces:
```
foo:
        ins     v0.d[1], xzr
        ret
foo1:
        movi    v31.4s, 0
        zip1    v0.2d, v0.2d, v31.2d
        ret
foo2:
        ins     v0.d[1], xzr
        ret
```

Which is better than 10.x but still not using fmov.