Lpc2000

Mileage will vary depending oon compiler, memory map etc.

I use gcc and I did some benchmarks a while ago (over a year back) 
using an old version of gcc patched with a FP update. On a 30MHz ARM7 
I got 2 secs for 10,000 sqrt() calls.

The best thing to do, IMHO, is to write a benchmark and run it on a 
the micro of your choice.



--- In lpc2000@yahoogroups.com, "tonalbuilder2002" 
<twentiethwave@h...> wrote:
> 
> I'm starting design work on a robotics controller that requires
> lots of floating point cos(), sin(), and sqrt().
> 
> I use 16 bit Freescale MC9S12 processors in the current version of 
> the design.  With the fastest possible clock and the Codewarrior 
> compiler it handles floating point multiplies in a decent 8 
> microseconds, but slips to ~400 microseconds for cos(), and ~250 
> microseconds for  sqrt().  This puts me at the minimum timing specs 
> for the design.
> 
> Would appreciate hearing any numbers you might have for cos(), 
sqrt), 
> etc. on the smaller ARMs, and the compiler, processor, and clock 
> speed that produced them.
> 
> Thanks!
> 
> Bill Tondreau
> http://www.kupercontrols.com