AVR-Chat

--- In AVR-Chat@yahoogroups.com, Martin Jay McKee 
<MartinJayMcKee@d...> wrote:
> I'd like to find a way to minimize the difference between the
> run times of the subroutine for states 1 and state N.

Instead of using a sequential set of comparisons (sometimes called a 
skip chain), use a dispatch table instead.  The table would contain 
code space addresses, you index it with the state value (after 
checking validity), load the address from the table into r31:30, and 
them do an ijmp or icall.  (Your target processor may or may not 
support these instructions.)

As a side note, in the code that you showed the clz instruction is 
superfluous.  The compare instruction will either set or clear the Z 
flag depending on the values.

Don