@p @nishi @animeirl @moesha qbe+cproc actually does better than 70% and in much less code than 10% (After all 10% of LLVM or GCC would still be gargantuan), so far it ends up at 0.1%
I haven't went into cproc code much yet but qbe code is quite nice while I remember tcc code as being messy to read, it has roots in IOCCC after all.

See https://archive.fosdem.org/2022/schedule/event/lg_qbe/ if you want a presentation of it.