[TUHS] dmr's C Compiler: a more detailed look?

[Warren Toomey via TUHS]

Hi all, does anybody know of a deeper dive into dmr's PDP-11 C compiler other
than "A Tour through the UNIX C Compiler" from the Unix Programmer’s 
Manual Vol 2B? I'm specifically interested in the PDP-11 code generation
from the AST trees: given the PDP-11 has a heap of addressing modes, there
must be interesting ways of using them in a compiler to avoid registers.

Anyway, if there is something closer to a function-level (and data structure
level) exposition, I'd be very keen to find it!

Many thanks in advance,
        Warren