[Bug tree-optimization/46763] gcc 4.5: missed optimization: copy global to local, prefetch

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46763

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=122083
   Target Milestone|---                         |16.0

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed on the trunk by r16-4260-gdecd4277e97114.

Phiopt1 turns:
```
  g = _14;
  goto <bb 6>; [INV]

  <bb 5> :
  g = i_5;

  <bb 6> :
```
Into:
```
  goto <bb 6>; [INV]

  <bb 5> :

  <bb 6> :
  # cstore_2 = PHI <_14(4), i_5(5)>
  g = cstore_2;
```

And then PRE can do the rest.