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ASL
Operation:
31
C
Assembler Syntax:
ASL
D
(move syntax - see the MOVE instruction description.)
ASL
S,D
(move syntax - see the MOVE instruction description.)
ASL
#shift,D
Description:
Single-bit shift: Arithmetically shift the low portion of the specified operand one bit to the left. The carry
bit receives the MSB shifted out of the low portion of the source operand. A zero is shifted into the least
significant bit of the destination operand. The result is stored in the low portion of D.
Multi-bit shift: Arithmetically shift the low portion of the specified operand N bits (up to 63 bits) to the left.
The number of bits to shift is determined by the 11-bit unsigned integer located in the 11 LSBs of the high
portion of S or by a 6-bit immediate field in the instruction. The carry bit receives the Nth bit shifted out of
the low portion of the source operand; it is cleared for a shift count of zero. N zeros are shifted into the
LSBs of the destination operand. If more than 32 bits are shifted, zeros will be stored in D and the carry
bit. The result is stored in the low portion of D.
Input Operand(s) Precision: 32-bit integer.
Output Operand Precision: 32-bit integer.
CCR Condition Codes:
C
- Set if the last bit shifted out of the operand is set. Cleared otherwise. Cleared for a
shift count of zero.
V
- Set if the MSB is changed any time during the shift operation. Cleared otherwise.
Z
- Set if result is zero. Cleared otherwise.
N
- Set if result is negative. Cleared otherwise.
I
- Not affected.
LR
- Not affected.
–
R
- Not affected.
A
- Not affected.
ER Status Bits:
Not affected.
IER Flags:
Not affected.
MOTOROLA
Arithmetic Shift Left
0
0
DSP96002 USER'S MANUAL
(parallel data bus move)
ASL
A - 27
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