[Bug tree-optimization/54776] [4.8 Regression] tramp3d-v4: 20% performance regression using -O3

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54776

--- Comment #7 from Jan Hubicka <hubicka at ucw dot cz> 2012-10-04 19:17:46 UTC ---
> > I assume you do see improvements with -O3 -fwhole-program?  (it improves the
> > scores in my setup, I would be curious to see how it compares to other numbers
> > you report)
> 
> Yes, with -O3 -fwhole-program I get:
>  Time spent in iteration: 6.34161
> 
> (With -fprofile-use -Ofast -march=native:
>  Time spent in iteration: 2.75908 )

Hmm, interesting.  Fixing the current resolution bug should get -flto and
-fwhole-program scores equivalent, but obviously there is a lot room for
improvement - I did not see so much preivously.

How does text size compare with clang lto/non-lto and gcc
whole-program/non-whole-program?

Honza