[CL] has been thinking about writing an explanation of why [Tcl] and assembly language can be good partners,
a practice briefly described in, for example, "Programming down to the Silicon"
[http://www.unixreview.com/documents/s=1357/ur0402i/].














In the meantime, here's a reference to the
[Mac OS X] Assembler Guide 
[http://developer.apple.com/documentation/DeveloperTools/Reference/Assembler/].