PSLLDQ
Usage: PSLLDQ dest,count Modifies flags: None
Shift xmm1 'dest' register left by 'count' bytes while shifting in 0s.
Shift Double Quadword Left Logical
PSLLDQ xmm1,imm8 ; 66 0F 73 / 7 ib [Pent4]
Shifts the 'dest' (first operand) to the left by the number of bytes specified in the 'count' (second operand).
The empty low-order bytes are cleared (set to all 0s). If the value specified by the count operand is greater than 15, the 'dest' operand is set to all 0s. The 'dest' operand is an XMM register. The 'count' operand is an 8-bit immediate.
EXAMPLE:
pslldq xmm1 4