I thought I'd jot down a couple notes outlining my experience so far with writing vector assembly for the iPhone. First of all, a couple of useful links... About the only examples on the web to date are in the vfpmathlibrary: http://code.google.com/p/vfpmathlibrary The website is currently down, but the ARM GCC Inline Assembly Cookbook has lots of great info: http://www.ethernut.de/en/documents/ar