Optimization options

Mon Feb 12 09:27:00 GMT 2007

Ignacio FernÃ¡ndez GalvÃ¡n wrote:
> Hi all,
>
> I'm compiling a program (Gaussian 98) which gives problems (probably
> numerical inaccuracies) with -O1. 
Are you talking about inconsistent precision?  You leave most of your 
details to be guessed at.
If this happens on an IA-compatible 32-bit target, does -mfpmath=sse 
(or, if your targer it really old, -ffloat-store) help?
Are suggested build parameters supplied with the application?