[Bug rtl-optimization/38518] Excessive compile time with -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38518

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Also look at gcc.opensuse.org/ in the c++bench "random" part.  At -O2 it shows

  df live&initialized regs:  12.12 (31%) usr
  backwards jump threading:   6.44 (17%) usr

the backwards jump threading thing is new.  Jeff?

At -O3 it runs OOM on vangelis, czerny reports 3.9GB memory use and besides the
above:

  load CSE after reload   : 120.58 (70%) usr

I try to add most "interesting" compile-time/memory-use testcases to the
C++ tester "random" part so we can track time-report / memory usage issues
there.

I think I've seen the load CSE after reload issue elsewhere, too.