[Bug target/109527] redundant register assignment

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109527

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
   Last reconfirmed|                            |2023-04-15
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Take:
```
short test(int t, short* a)
{
    *a = 1;
    return *a;
}
```
This produces decent code for aarch64:
```
        mov     w0, 1
        strh    w0, [x1]
        ret
```


Note I suspect this is really does not show up that often either and only
happens with return values.