Method and system for emulating instructions by performing an operation directly using special-purpose register contents

摘要

A system and method for improving the performance of a processor that emulates a guest instruction where the guest instruction includes a first and second operand. The first operand is stored in a general purpose register, and the second operand is stored in a special-purpose register. The method and system provides a host instruction that performs an operation using the first operand and the second operand without moving the second operand from the special-purpose register into the general purpose register. This reduces the number of instructions in the semantic routines necessary to operate on immediate data from guest instructions and increases emulation performance./!