Tower of Babel: Computer manuals at their worst!

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?A unit of operation begins by shifting the contents of the general register 5 right logically one position and then setting bit 29 to zero. However, register 5 remains unchanged if the execution of a unit of operation is nullified or suppressed. If after shifting and setting bit 29 to zero, the contents of register 5 are zero, the instruction is completed and condition 1 is set. Otherwise, the unit of operation continues in accordance with one of two methods, and which method used is unpredictable.?
IBM Update Tree Assembler manual. Submitted by Tony French, London.