Analog Devices ADSP-BF53x Blackfin Reference page 719

Example
r4=r5>>3 (v) ;
/* logical right shift immediate R5.H and R5.L by 3 bits */
r4=r5<<3 (v) ;
/* logical left shift immediate R5.H and R5.L by 3 bits */
r2=lshift r7 by r5.l (v) ;
/* logically shift (right or left, depending on sign of r5.l)
R7.H and R7.L by magnitude of R5.L */
Also See
Vector Arithmetic
Special Applications
None
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
Shift, Arithmetic Shift,
Vector Operations
Logical Shift
19-31