Despite the fact that I have difficulties using C syntax I will not deny that many C sources are neat, clean and efficient ways of describing programs. But... I've been looking at the output generated by gcc and other compilers and, in my own opinion, the above neatness and efficiency takes a beating in translation to executable form. Perhaps I need to experiment with the more extreme efficiency options when compiling but, as a particular example, it's common to see pointless loads and stores in compiled C programs.

fd2pragma is a program distributed with vbcc that may be capable of generating assembler type include files but I'm reluctant to spend the time trying to understand it's documentation and actually find out. That might change if / when I take on a larger project - just putting it out there for any other programmers interested in assembly and wishing to get better use out of the SDK.