gcc: speed problem with several g++ versions

[Andreas Kowarz <kowarz at math dot tu-dresden dot de>]

Hello,

we made some interesting experience while implementing and testing a software 
package, which makes use of overloaded operators. One aspect of the 
implementation is the speed of the resulting binaries. To find the best solution 
we have tested the following approaches: normal overloading and templates. The 
example (attachment) contains the source code for 3 programms:

prog     - execution without overloading
progtemp - template based
progover - normal overloading

Compiled with g++ version 3.2 we got the following runtime:
prog       about 2.9 seconds
progtemp   about 2.9 seconds
progover   about 3.5 seconds
It seems clear that the template based implementation should be the one to use.

After recompiling with g++ version 3.4.1 we got a complete different result:
prog       about 2.9 seconds
progtemp   about 15.4 seconds !!!
progover   about 3.5 seconds
This time the template version is not really good. :-(
(Same problem with g++ version 3.3.2 on a different machine)

My questions are:
- Is this a known problem?
- Is there a compiler switch which can solve the problem?

Sincerely yours,

Andreas Kowarz

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