[Bug tree-optimization/100745] GCC generates suboptimal assembly from vector extensions on AArch64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100745

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-02-27
          Component|target                      |tree-optimization
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
  # vsum$0_107 = PHI <_47(11), _29(10)>
  _232 = BIT_FIELD_REF <vsum$0_107, 128, 0>;
  _231 = .FMA (_100, _101, _232);
  _230 = BIT_FIELD_REF <vsum$0_107, 128, 128>;
  _229 = .FMA (_234, _235, _230);
...
  _47 = {_231, _229};

...
```

Confirmed, I thought I saw this before, basically inside the loop we keep
together the generic vector still and this causes stores IIRC.