[Bug tree-optimization/61743] [4.10 Regression] Complete unroll is not happened for loops with short upper bound

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61743

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Yuri Rumyantsev from comment #8)
> Richard,
> 
> I tested both proposed fixes and i turned out that the first one is
> preferable since performance of benchmark came back. Note that hoisting 2nd
> vrp pass gave us another 14% slowdown but I did not investigate it.
> 
> Should I tested your fix or you do it yourself?

I'd like to explore on how to make it a little more "generic", it's a very
special hack as-is.

> Thanks.