[Bug tree-optimization/77283] [7 Regression] Revision 238005 disables loop unrolling

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77283

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #7)
> Also my adjustment of gcc.dg/tree-ssa/split-path-7.c was only good in my dev
> tree for some reason.  Otherwise bootstrapped / tested on
> x86_64-unknown-linux-gnu.

Ah, that's because my dev tree has store commoning during sinking which turns

  if ()
    *dp = ...
  else
    *dp = ...
  if (++dp)
    goto loop;

into

  if ()
    ...
  else
    ...
  *dp = ...
  if (++dp)
    goto loop;

making the block artificially interesting.