Is possible to do this?

[boriel]

When doing things like this, just compile with --asm flag to see the resulting asm file, and examine it.
I was wrong: you have to prefix ("mangle") you labels in ASM, with __LABEL__. So this should work:

Code:

SUB mySuperSub()
  REM this label goes *inside* the sub or it will not work as you expect
iniSuperSub:
...
...
...
  REM this label goes *inside* the sub or it will not work as you expect
endSuperSub:
END SUB

SUB otherSub()
  ASM
    defs 6144-(__LABEL__endSuperSub - __LABEL__iniSuperSub),0
  END ASM
END SUB