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INSTRUCTION SET OPCODES AND CLOCK CYCLES
D-22
Table D-5. Abbreviations for Mnemonic Encoding Matrix
Abbr Definition Abbr Definition Abbr Definition Abbr Definition
b byte operation ia immediate to accumulator m memory t to CPU register
d direct id indirect r/m EA is second byte v variable
f from CPU register is immediate byte, sign extended si short intrasegment w word operation
i immediate l long (intersegment) sr segment register z zero
Byte 2 Immed Shift Grp1 Grp2
mod 000 r/m ADD ROL TEST INC
mod 001 r/m OR ROR — DEC
mod 010 r/m ADC RCL NOT CALL id
mod 011 r/m SBB RCR NEG CALL l, id
mod 100 r/m AND SHL/SAL MUL JMP id
mod 101 r/m SUB SHR IMUL JMP i, id
mod 110 r/m XOR — DIV PUSH
mod 111 r/m CMP SAR IDIV —
mod
and
r/m
determine the Effective Address (EA) calculation. See Table D-1 for definitions.