M4 as an assembler preprocessor: looking for sample .m4 Assembly code

I'm looking for Assembly source code that uses M4 as a macro preprocessor
for an assembler, which I'd like to study. I'd prefer 8080, Z80, or x86
code but any CPU, microcontroller, or SoC will do.

The only such code I found is the M4-based macro package for PicoBlaze
microcontrollers <https://kevinpt.github.io/opbasm/rst/m4.html>, whose
assembler comes with .m4 source
<https://github.com/kevinpt/opbasm/blob/master/opbasm/picoblaze.m4>.

Thanks,


Paolo
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