Decompiler produces a weird output for setjmp/longjmp

[Nemoumbra]

The platform is MIPS (and also MIPS Allgrex via a dedicated plugin: the issue is present in both.)

The only issue I have with the decompilation of setjmp is the name register0x00000074 for sp.

The issue with longjmp is that the decompiler culls away the operations with the registers. That's not "unreachable code" and I can't control this (or can I?).

I guess, these 2 functions are very unique, but Ghidra really likes to cull away the stack operations which really confuses me and breaks the data flow in my head. Can this be improved?