***BOGO*** Re: [Mingw-users] GCC 4.3.0 20080502 (alpha) Released - Please help us test it!

["Aaron W. LaFramboise" <aaron77thyme@xxxxxxxxxxx>]

Stéphane Larouche wrote:

> As you can see, the 4.3.0 alpha version is much slower that the
> other ones.

Thank you very much for testing this.  Yes, this is definitely a 
problem; this should not be happening.  The good news is if we can track 
it down, its probably possible to fix it one way or another.

> In addition to speed and size differences, I have noticed that
> the results returned by the software are slightly different in
> the different GCC versions. Is it possible that mathematical
> functions do not handle floats/doubles correctly?

This is possible.  GCC, particularly on MinGW, is particularly sensitive 
to algorithms that have stability problems.

This is a problem in general on i386 due to the way that relatively 
simple operations (such as assignment) can cause the fp size to change. 
  This is a very difficult problem to solve, and is present in most 
compilers based on i386 chips.  The best workaround is careful coding to 
avoid inadvertent sensitivity or instability.

> I will try to find some time during the weekend to generate a
> minimal example that reproduces the problem.

Please let me know how this goes for you.


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