[Bug tree-optimization/120833] gcc does not recognize tail calls with converting between like structs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120833

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
get_s2 is harder and requires store/load merging:
```
  _1 = x.data;
  _2 = x.size;
  D.4700.data = _1;
  D.4700.size = _2;
```

Which does not happen because the current store/load merging pass only takes
into account up to the register size rather than more.