I tried a copy of ARM's RVCT (RealView Compiler Tools) v2.0.1

The numbers and some updated code that builds on RVCT and ADS are posted
at http://www.dwelch.com/gba/dhry.htm

Looking at the numbers the new compiler is 7 percent faster than ads
1.2. And is 22% faster than the last gcc 3.4 ran I did (experimental
version).

I have also been playing with the htsoft.com armc compiler, no numbers
to post, they do have or will have a version available that does thumb
mode soon.

David