[Bug middle-end/58478] very slow compilation at -O1 and above on a nested loop

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58478

--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Marek Polacek from comment #1)
> Confirmed.

That's quick; thanks Marek! 

Please also take a look at 58479 when you get a chance. 

It's related (as well as 58318).