Testing hybrid instruction architecture

A computer-implemented method for testing a hybrid architecture instruction set is provided. The method includes defining a first instruction definition table for a first base architecture, and defining a second instruction definition table for a second base architecture, wherein the first base architecture is different than the second base architecture. The method also includes defining a delta table, wherein the delta table defines architecture specific behavior, and generating a hybrid architecture table based on the delta table and at least one of the first instruction definition table or the second instruction definition table. The method includes executing a test based on the hybrid architecture table, wherein the hybrid architecture table is for a hybrid architecture that is compatible between the first base architecture and the second base architecture.