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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/41969] [LTO] 23% slow-down with -flto -fwhole-program
Date: Sun, 18 Mar 2012 16:32:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41969

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |burnus at gcc dot gnu.org
         Resolution|                            |FIXED

--- Comment #5 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-03-18 16:23:12 UTC ---
(In reply to comment #4)
> Is this still true?

It seems to be FIXED - and the performance is now better as well!

(In reply to comment #0)
> The following test case takes
>   9.100s with gfortran -O3
>  11.113s with gfortran -flto -fwhole-program -O3

Now with GCC 4.8: 6.780s (For completeness, with -fno-whole-file: 11.106s)

>   5.205s with gfortran -ffast-math -march=native -funroll-loops -O3
>   7.414s with gfortran -ffast-math -march=native -funroll-loops -flto
> -fwhole-program -O3

Now: 4.765s