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SAL
SHL
SHIFT
ARITHMETIC
LEFT
SHIFT
LOGICAL
LEFT
Operation:
(temp)
+--
COUNT
do
while (temp)
=1=
0
(CF)
+--
high-order
bit
of
(EA)
(EA)
+--
(EA)
* 2
(temp)
+--
(temp)-1
if
COUNT = 1 then
if
high-order
bit
of
(EA)
=1=
(CE)
then
(OF)
+--1
else (OF) +-- 0
else (OF) undefined
Description:
SHL/SAL destination,
count
SHL and SAL (Shift Logical Left and Shift
Arithmetic Left) perform the same operation
and are physically the same instruction. The
destination byte
or
word
is
shifted 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.
2-143
Flags Affected:
CF,
OF,
PF,
SF,
ZF.
AF
undefined
SAL
SHL