[Bug middle-end/58681] Missed RTL optimization - same insns before unconditional jump as before the jump target

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58681

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         Depends on|                            |46555
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is fixed with the patch set I sent out for PR 46555.
New forwarder block for edge 3 -> 5.


```
  <bb 6> [local count: 182536112]:
<L11>:
  goto <bb 5>; [100.00%]


  <bb 5> [local count: 1073741824]:
  # c_3 = PHI <-3(2), 0(6)>
  # d_4 = PHI <-1(2), 12(6)>
  # e_5 = PHI <-20(2), 26(6)>
  # f_6 = PHI <-5(2), 7(6)>
```


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46555
[Bug 46555] [13/14/15/16 Regression] PHI RTL expansion leads to CSiBE
regression