Lpc2000

--- In lpc2000@yahoogroups.com, "James Dabbs" <jdabbs@t...> wrote:
> 
> I'm trying to squeeze a few more cycles out of one my LPC, and I'm
> looking for an optimized way to divide by 10 and leave the quotient 
and
> remainder.  I.e., a faster way to do this:
> 
> #define DIVIDE_BY_10(D, Q, R) Q=D/10; R=D%10;  // D is unsigned long


Check out "How to optimize for the Pentium family of microprocessors"
http://www.agner.org/assem/pentopt.pdf

The section "Division (all processors)" has a smart algorithm for 
converting division by a constant to a cheaper multiplication and 
shift.

Karl Olsen