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Re: c++/8675: 30% slower code using gcc3.2 vs. gcc3.0.1
- From: bangerth at dealii dot org
- To: gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, pfr+gcc at cs dot cmu dot edu
- Date: 21 Dec 2002 18:52:46 -0000
- Subject: Re: c++/8675: 30% slower code using gcc3.2 vs. gcc3.0.1
- Reply-to: bangerth at dealii dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, pfr+gcc at cs dot cmu dot edu, gcc-gnats at gcc dot gnu dot org
Synopsis: 30% slower code using gcc3.2 vs. gcc3.0.1
State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Sat Dec 21 10:52:45 2002
State-Changed-Why:
It is very hard to track down where within 20,000 lines of
code something becomes slower if you are not familiar with
what the code does, where call-paths are, etc. I think you
need to provide us with more information about what goes
wrong, i.e. try to identify functions that become significantly
slower and possibly show us the differences in the generated
assembler code.
Sorry for not being of more help -- I guess for performance
regressions we really need cooperation from the people who
file the reports...
Thanks
Wolfgang
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8675