GCC 4.0.0 Performance Regressions?

[Giovanni Bajo]

Jason Bucata <jbucata@tulsaconnect.com> wrote:

>> You should try and isolate a single BYTEmark test which shows the
>> biggest regression. It's better if you manage to pack the whole test
>> as a single preprocessed source file. Theoretically, this file
>> should be compilable and linkable, and the resulting binary should
>> run for a while doing computations. 
>> 
>> With this kind of help, we can analyze the regression and see why
>> it's slower with 4.0.0.
> 
> It was rather time-consuming but I managed to do it.  I picked the
> numsort benchmark which had a serious regression:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21485


Many, many thanks!

Giovanni Bajo