1. A computer program product for executing a Load/Store Disjoint (LSD) instruction in a processor of a multi-processor system, the computer program product comprising a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: obtaining a Load/Store Disjoint instruction for execution, the Load/Store Disjoint instruction comprising an opcode, the execution comprising: performing a LSD specified operation based on the obtained opcode, the operation comprising accessing one or more operands in memory; responsive to determining whether a store event from another processor of the multi-processor system may have modified one of the one or more operands during the accessing the one or more operands in memory, setting a first indicator value, said first indicator value indicating whether a store event from another processor of the multi-processor system may have modified one of the one or more operands during the accessing the one or more operands in memory.