[Bug tree-optimization/110640] [13/14 Regression] Wrong code at -O2/3 on x86_64-linux-gnu since GCC-13

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110640

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
We end up with

  <bb 10> [local count: 78745003]:

  <bb 11> [local count: 78745003]:
  *c.5_6 = _7;
  f.7_32 = f;
  if (f.7_32 != 0)
    goto <bb 12>; [89.00%]
  else
    goto <bb 10>; [11.00%]

  <bb 12> [local count: 70083053]:
  f = 0;
  goto <bb 10>; [100.00%]

disabling loop header copying (-fdisable-tree-ch2) also avoids the issue.