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#include"xc.inc" GLOBAL _multi_signed PSECT mytext,local,class=CODE,reloc=2 _multi_signed: MOVWF 0x00 BTFSS 0x00, 7 GOTO Positive GOTO Negative Positive: BTFSS 0x01, 3 GOTO PMulP GOTO PMulN Negative: BTFSS 0x01, 3 GOTO NMulP GOTO NMulN PMulN: COMF 0x01 MOVF 0x00, W MOVWF 0x11 RCALL Multiplication GOTO NegativeFinish PMulP: DECF 0x01 MOVF 0x00, W MOVWF 0x11 RCALL Multiplication GOTO PositiveFinish NMulN: COMF 0x00 INCF 0x00 COMF 0x01 MOVF 0x00, W MOVWF 0x11 RCALL Multiplication GOTO PositiveFinish NMulP: COMF 0x00 INCF 0x00 DECF 0x01 MOVF 0x00, W MOVWF 0x11 RCALL Multiplication GOTO NegativeFinish Multiplication: ADDWF 0x11 BTFSC STATUS, 0 INCF 0x10 DECFSZ 0x01 GOTO Multiplication RETURN PositiveFinish: MOVFF 0x11, 0x01 MOVFF 0x10, 0x02 RETURN NegativeFinish: MOVFF 0x11, 0x01 COMF 0x01 INCF 0x01 MOVFF 0x10, 0x02 COMF 0x02 RETURN
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