DEVICE AND METHOD FOR MUTUAL DYNAMIC CONVERSION BETWEEN DIFFERENT INSTRUCTION CODES

摘要

PROBLEM TO BE SOLVED: To obtain the possibility of parallel decoding of instructions and to make easy alterations of a conversion path by using reconstitution information corresponding to the instruction of the code and reconstituting instruction elements of the instruction of the code according to the reconstitution information. SOLUTION: The reconstitution information needed to convert an external instruction 100 into one group of internal instructions 101 is included in a conversion table 106. Respective entries 105 of the table 106 correspond to one instruction 100 of an external code to determine how instruction elements of this specific instruction should be reconstituted to form corresponding internal instructions 101. Then the elements of the external instruction like immediate data 110, logical register identifiers 111 and 112, status information, and others 113 and 114 are reconstituted by one group of multiplexers 120 to 124. The outputs of the respective multiplexers are written directly in corresponding fields.