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KSHIFTRD

Shifts the bits of a qword source to the right by a count specified in the CL register. This operation performs a logical shift, filling the most significant bits with zeros.

The following table covers what the source and destinations can be.

DO NOT support LOCK

This instruction is only available in 64-bit mode. It SHALL NOT be used in compatibility mode.

The shift count is masked to 6 bits (0-63) for qword operands; any bits in CL beyond the 6th bit are ignored. The Carry Flag (CF) is updated based on the last bit shifted out of the LSB.