??? RISC???????????? x86???????????????????????? RISC?

???? x86?????????????????? In this work, we first analyzed the features of x86 instruction set and defined micro operations as RISC-based instruction set to efficiently support x86 emulation. To further improve the performance, powerful RISC instructions are synthesized by compacting multiple micro operations into a single RISC instruction. The synthesized powerful instructions are evaluated by a cost function contained execution cycle, instruction set size and the hardware cost. As a result, the new powerful instruction set can execute the x86 instructions with reduced instruction cycle counts and gained the performance in instruction level