[Bug tree-optimization/114228] [14 Regression] memset/memcpy loop not always recognised with -Os

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114228

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Keywords|                            |needs-bisection
   Last reconfirmed|                            |2024-03-04
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |14.0
            Summary|memset/memcpy loop not      |[14 Regression]
                   |always recognised with -Os  |memset/memcpy loop not
                   |                            |always recognised with -Os

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

The IR is the same before coming into ldist .

ldist in 13.2.0 had:
```
ldist creates useful parallel partition:
  0, 1, 2, 3, 4
Applying pattern match.pd:365, generic-match.cc:23462
distribute loop <1> into partitions:
```

But the trunk:
```
ldist asked to generate code for vertex 3
ldist creates useful parallel partition:
  0, 1, 2, 3, 4
Loop 1 not distributed.
```

But no reason why though.