Non-canonical two's complement arithmetics

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baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 17 Dec 2008, 18:09

Some bit indices used below:
MS: most significant bit in operand;
LSZ: least significant 0 bit;
LSNZ: least significant 1 bit.

INC: invert bits LSZ…0.
CF: not changed; AF: LSZ > 3; OF: LSZ == MS.
DEC: invert bits LSNZ…0.
CF: not changed; AF: LSNZ > 3; OF: LSNZ == MS.
NEG: invert bits MS…LSNZ+1.
CF: not ZF; AF: LSNZ < 4; OF: LSNZ == MS.

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17 Dec 2008, 18:09

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