Operation

(* COUNT is the second parameter *)
(temp) COUNT;
WHILE (temp<> 0)
DO
IF instruction is SAL or SHL
THEN CF high-order bit of r/m;
FI;
IF instruction is SAR or SHR
THEN CF low-order bit of r/m;
FI;
IF instruction = SAL or SHL
THEN r/m r/m * 2;
FI;
IF instruction = SAR
THEN r/m r/m ;2 (*Signed divide, rounding toward negative infinity*);
FI;
IF instruction = SHR
THEN r/m r/m / 2; (* Unsigned divide *);
FI;
temp temp - 1;
OD;
* Determine overflow for the various instructions *)
IF COUNT = 1
THEN
IF instruction is SAL or SHL
THEN OF high-order bit of r/m <> (CF);
FI;
IF instruction is SAR
THEN OF 0;
FI;
IF instruction is SHR
THEN OF high-order bit of operand;
FI;
ELSE OF undefined;
FI;

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