Fixed-point string instructions

The Fixed-Point String instructions allow the movement o data from storage to registers or from registers to storage without concern for alignment.

The Fixed-Point String instructions allow the movement of data from storage to registers or from registers to storage without concern for alignment. These instructions can be used for a short move between arbitrary storage locations or to initiate a long move between unaligned storage fields. Load String Indexed and Store String Indexed instructions of zero length do not alter the target register.