Chapter 4. Metaprogramming
Assembly programming is a bore,
but for critical parts of programs.
You should use the appropriate tool for the right task,
so don't choose assembly when it does not fit;
C, OCaml, perl, Scheme, might be a better choice
in the most cases.
However, there are cases when these tools do not give
fine enough control on the machine, and assembly is useful or needed.
In these cases you'll appreciate a system of macroprocessing and
metaprogramming that allows recurring patterns to be factored
each into one indefinitely reusable definition, which allows
safer programming, automatic propagation of pattern modification, etc.
Plain assembler often is not enough,
even when one is doing only small routines to link with C.
Take our 
