Re: [avr-gcc-list] math linking problem even with -lm

[E. Weddington]

Andrew McNabb wrote:

>  
>
> > Btw., I'd personally avoid using time-consuming functions like
> > trigonometrical functions within an interrupt vector.  Heck, I'd avoid
> > calling *any* function from within an interrupt vector, as it will
> > make the compiler push/pop a lot more registers than needed without
> > that.
> >    
>
> Yeah.  I was just testing some stuff out.  I'm actually planning on
> precomputing a table and then grabbing entries from it in the interrupt
> handler.  Is that a reasonable approach?
>
>  

Yes, any lookup table-type alogrithm will in general be the fastest. 
Caution on *where* you put the table though, RAM or Flash. There are 
tradeoffs, of course, depending on your specific application.

Eric