Name: Analog Devices adsp-2100
Brand: Analog Devices
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B Division Exceptions

B – 8

do_divs: DIVS AY1, AR; DIVQ AR; {Compute sign of quotient}

DIVQ AR; DIVQ AR;

recover_sign: MY0=AX0,AR=PASS AY0; {Put quotient into AR}

IF NEG AR=-AY0; {Restore sign if necessary}

MR=MR-AR*MY0 (SS); {compute remainder dividend neg}

RTS; {Return to calling program}

unsigned_div: MR0=AY0, AF=PASS AY1; {Move dividend MSW to AF}

MR1=AY1, AR=PASS AX0; {Is MSB set?}

test_10: IF GT JUMP test_11; {No, so check overflow}

ASTAT=0x4; {Yes, so set overflow flag}

RTS; {Return to caller}

test_11: AR=AY1-AX0; {Is divisor<dividend?}

IF LT JUMP do_divq; {No, so go do unsigned divide}

ASTAT=0x4; {Set overflow flag}

RTS;

do_divq: ASTAT=0; {Clear AQ flag}

DIVQ AX0; DIVQ AX0; {Do the divide}

DIVQ AX0; DIVQ AX0;

uremainder: MR2=0; {MR0 and MR1 previous set}

MY0=AX0, AR=PASS AY0; {Divisor in MYO, Quotient in AR}

MR=MR-AR*MY0 (UU); {Determine remainder}

RTS; {Return to calling program}

.ENDMOD;

Listing B.1 Division Error Routine

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Analog Devices adsp-2100 Specifications

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