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Re: Just a reminder of serious open 3.3 PRs
On Tue, 15 Apr 2003, Steven Bosscher wrote:
>> -O0 -O1 -O2 -O3
>> GCC 3.0.4 27.95 44.52 56.57 56.48
>> 3.2-branch 29.87 +7% 54.28 +22% 70.95 +25% 75.29 +33%
>> 3.3-branch 29.09 +4% 57.11 +30% 78.99 +40% 81.61 +44%
>> mainline 27.06 56.09 77.77 82.02
>>
>> Here we have +30% when comparing against 3.0.4 for -O1, and +40% for -O2!
> Yes -- but what is a bit surprising (at least, to me) is that most of
> the slowdown is already introduced at -O1.
>
> What do the time reports tell you, which parts are the biggest losers?
> I assume you left the default GC params in for 3.3 and mainline?
Yes, so in a sense if was unfair towards _older_ releases, and the
current CVS sources are even worse. :-(
Dan Nicolaescu and Kaveh Ghazi did some further analyses
http://gcc.gnu.org/ml/gcc/2002-12/msg00516.html
http://gcc.gnu.org/ml/gcc/2003-04/msg00251.html
http://gcc.gnu.org/ml/gcc/2003-04/msg00252.html
and I know also updated PR/8361 with this new information.
Gerald
PS: Note that I first filed this problem as PR 3083 close to two years
ago. :-(