gforth: gforth/abi-code-test.fs

support for assembler definitions with host platform's ABI calling conventions
('ABI-CODE')

abi-code my+  ( n1 n2 -- n3 )
   di ax mov		\ ABI: sp passed in di, returned in ax
   si dx mov		\ ABI: fp passed in si, returned in dx
   ax ) r8  mov		\ load sp[0]
   8 ax d) r8 add	\ add sp[1]
   8 # ax  add		\ store result to *++sp
   r8  ax ) mov
   ret			\ return to caller
end-code

: my+-compiled   ( n1 n2 -- n3 ) my+ ;

assert0( 12 34 my+  46 = )
assert0( 12 34 my+-compiled  46 = )

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