asm-library/Mult8Calls at master · Nibble-Knowledge/asm-library · GitHub

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#to call Mult8 as signed multiplication:

MOV8 $Op1 INTO Mult8_Op1
MOV8 $Op2 INTO Mult8_Op2
MOVADDR Return INTO Mult8_RetAddr[1]
LOD N_[0]
JMP Mult8_SignedEntry
Return:
NOP 0

#to call Mult8 as unsigned multiplication:

MOV8 $Op1 INTO Mult8_Op1
MOV8 $Op2 INTO Mult8_Op2
MOVADDR Return INTO Mult8_RetAddr[1]
LOD N_[0]
STR Mult8_Op1Ex
STR Mult8_Op2Ex
JMP Mult8_UnsignedEntry
Return:
NOP 0

#to call Mult8 as unsafe 16-bit multiplication:

MOV16 $Op1 INTO Mult8_1full
MOV16 $Op2 INTO Mult8_2full
MOVADDR Return INTO Mult8_RetAddr[1]
LOD N_[0]
JMP Mult8_16Entry
Return:
NOP 0


#16-bit answer is now in Mult8_Ans.
#The answer will be determined according
#to the same signedness as the call.
#If you only want an 8-bit answer,
#look in Mult8_Ans[2]