[Bug tree-optimization/79389] [7 Regression] 30% performance regression in SciMark2 MonteCarlo

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79389

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 40818
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40818&action=edit
patch

Patch I am testing for the loop splitting cost model.  I still believe loop
splitting on its own is not profitable and it should be integrated with
threading and CSE.