[Bug target/33604] [4.3/4.4 Regression] Revision 119502 causes significantly slower results with 4.3/4.4 compared to 4.2

michael dot olbrich at gmx dot net gcc-bugzilla@gcc.gnu.org
Sun Mar 2 12:15:00 GMT 2008



------- Comment #38 from michael dot olbrich at gmx dot net  2008-03-02 12:14 -------
I tried again with 
g++-4.2 (GCC) 4.2.3 (Debian 4.2.3-2)
g++-4.3 (Debian 4.3-20080227-1) 4.3.0 20080227 (prerelease) [gcc-4_3-branch
revision 132730]

The problem still exists for the first two test cases.
As I noted in comment #8 there is a significant speedup from -O2 to -O3 for
g++-4.2 (18s -> 5s)
With the current g++-4.3 there is no difference between -O2 and -O3 (both 14s)
"-fforce-addr" which produced significant speedup does not exist anymore.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604



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