4.3.0 strange problem with computation and optimization

Lasse Kliemann lasse-list-gcc-2008@mail.plastictree.net
Fri Mar 14 17:09:00 GMT 2008


* Message by -Dario Saccavino- from Thu 2008-03-13:
> > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
> >
> >
> > Did all lose interest?  Or is there a plan to do some kind of fix?
> >
> 
> I haven't found any comment on the effect of sse/sse2 on this "bug".
> 
> Anybody knows if using -msse2 -mfpmath=sse can help obtain a better
> conformant assembly? The sse regs should have the correct precision
> (32 for float, 64 for double), so maybe part of the undesired
> behaviour can be avoided.

All I can tell you is that after a study of several comments, I chose to use 
that. So far, I have no complaints about it. In fact, I am using -mssse3, 
which seems to be the "highest" such extension on the Xeon 5310, according to 
/proc/cpuid. I could not measure any performance gain compared to -msse2, 
however.

Next step will be to install a 64 bit system.

Lasse
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