[ECOS] floating point

Jonathan Larmour jifl@eCosCentric.com
Mon Jan 27 04:32:00 GMT 2003


David N. Welton wrote:
> I am still running into problems with floating point.  It works fine
> with the non-lazy switching, but gives me very funny results with it.
> For instance, a variable that only has +=, -= and = applied to it
> sometimes turns into a NaN.
 >
> As I'm interested in learning more about how things work, I would like
> to try and track this down or at least figure out how...  I'm not sure
> the best way of debugging problems at this level.  Any suggestions?

I remember having to debug some stuff here before. It isn't nice! 
hal/i386/arch/current/include/arch.inc is where the fun is.

> Another question - I'm I correct in assuming that the built in libm
> functions are not overridden with hardware-supported functions (fsin
> on x86, for instance)?

Correct.

Jifl
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