Filter
Top Products
INSTRUCTION SET DESCRIPTIONS
C-40
SHL
SAL
Shift Logical Left:
Shift Arithmetic Left:
SHL
dest, count
SAL
dest, count
Shifts the destination byte or word left
by the number of bits specified in the
count operand. Zeros are shifted in on
the right. If the sign bit retains its
original value, then OF is cleared.
Instruction Operands:
SHL reg, n SAL reg, n
SHL mem, n SAL mem, n
SHL reg, CL SAL reg, CL
SHL mem, CL SAL mem, CL
(temp) ← count
do while (temp)
≠
0
(CF) ← high-order bit of (dest)
(dest) ← (dest) × 2
(temp) ← (temp) – 1
if
count = 1
then
if
high-order bit of (dest)
≠
(CE)
then
(OF) ← 1
else
(OF) ← 0
else
(OF) undefined
AF ?
CF
DF –
IF –
OF
PF
SF
TF –
ZF
SAR Shift Arithmetic Right:
SAR
dest, count
Shifts the bits in the destination
operand (byte or word) to the right by
the number of bits specified in the
count operand. Bits equal to the
original high-order (sign) bit are shifted
in on the left, preserving the sign of the
original value. Note that SAR does not
produce the same result as the
dividend of an "equivalent" IDIV
instruction if the destination operand is
negative and 1 bits are shifted out. For
example, shifting –5 right by one bit
yields –3, while integer division –5 by 2
yields –2. The difference in the instruc-
tions is that IDIV truncates all numbers
toward zero, while SAR truncates
positive numbers toward zero and
negative numbers toward negative
infinity.
Instruction Operands:
SAR reg, n
SAR mem, n
SAR reg, CL
SAR mem, CL
(temp) ← count
do while (temp) ≠ 0
(CF) ← low-order bit of (dest)
(dest) ← (dest) / 2
(temp) ← (temp) – 1
if
count = 1
then
if
high-order bit of (dest) ≠
next-to-high-order bit of (dest)
then
(OF) ← 1
else
(OF) ← 0
else
(OF) ← 0
AF ?
CF
DF –
IF –
OF
PF
SF
TF –
ZF
Table C-4. Instruction Set (Continued)
Name Description Operation
Flags
Affected
NOTE: The three symbols used in the Flags Affected column are defined as follows:
– the contents of the flag remain unchanged after the instruction is executed
? the contents of the flag is undefined after the instruction is executed
the flag is updated after the instruction is executed