[Bug tree-optimization/46590] [4.6/4.7/4.8 Regression] long compile time with -O2 and many loops

[stevenb.gcc at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46590

--- Comment #29 from stevenb.gcc at gmail dot com <stevenb.gcc at gmail dot com> 2012-08-22 17:33:00 UTC ---
> I thought that loop header copying wouldn't need to insert new PHI nodes
> and thus can do with TODO_update_ssa_no_phi if we are in loop-closed SSA form,
> but appearantly that is not the case (I didn't inverstigate further here,
> but possibly that's just because virtual operands are not in loop-closed
> SSA form).

I'll experiment with VOPs in LC-SSA.