摘要 |
FOLLOWING EXECUTION OF A SUBROUTINE, A RETURN INSTRUCTION IS EXECUTED HAVING AN ADDRESS AS AN INPUT OPERAND THERETO. THIS INPUT OPERAND IS COMPARED WITH ONE OR MORE PREDETERMINED VALUES TO DETECT A MATCH AND THE RETURN INSTRUCTION RESPONSE IS SELECTED IN DEPENDENCE UPON WHETHER OR NOT A MATCH IS DETECTED. THUS, THE RETURN ADDRESS VALUE CAN BE USED TO INVOKE DIFFERING RETURN INSTRUCTION RESPONSES, SUCH AS AN EXCEPTION RETURN RESPONSE OR A PROCEDURE RETURN RESPONSE. THE ONE OR MORE PREDETERMINED ADDRESSES MAY BE CONVENIENTLY ALLOCATED TO THE HIGHEST MEMORY ADDRESSES WITHIN THE MEMORY MAP.
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