why doesn't assembly language have a parse tree?

I was looking into a sexpr language to use instead of tcl or lua for a new project, so I started looking through a bunch of them.
Scheme seemed to be a smaller language than a Lisp, so I was looking at those. Guile Scheme in particular sounded compelling. Not really interested in the "language" beyond the default behavior of the reader, and the runtime. Saw it was advertised as minimalist, it had a jitter, etc. so I figured hell I'll check this out... and it's more than twice the size of luajit. 10x the size of jimtcl.

Is there a smaller scheme implementation that still has JIT? I don't really want something more than 50k lines. At the same time, I'm not interested in a toy lisp that's just a tree-walking interpreter. I don't mind having zero stdlib, I just don't want something with the most naive runtime ever made.

Does anybody have any suggestions?

>>49320790
Reminder that Doremy is canonically one of the prettiest girls in the setting, based only on ZUN seeing her portrait in 15.5 (which is much prettier than everybody else in that game) and approving it