Operation

AddressSize = 16
THEN use SI for source-index
ELSE (* AddressSize = 32 *)
use ESI for source-index;
FI;
IF byte type of instruction
THEN
AL [source-index]; (* byte load *)
IF DF = 0 THEN IncDec 1 ELSE IncDec -1; FI;
ELSE
IF OperandSize = 16
THEN
AX [source-index]; (* word load *)
IF DF = 0 THEN IncDec 2 ELSE IncDec -2; FI;
ELSE (* OperandSize = 32 *)
FAX [source-index]; (* dword load *)
IF DF = 0 THEN IncDec 4 ELSE IncDec -4; FI;
FI;
FI;
source-index source-index + IncDec

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