扩展指令集是指CPU增加的多媒体或3D处理指令，这些扩展指令可以提高CPU处理多媒体和3D图形的能力，著名的有MMX（多媒体扩展指令）、SSE（因特网数据流单指令扩展）和3D Now！指令集。
图形处理器使用多流单指令数据流扩展指令集技术。
Pertaining to an instruction format containing more than one address part.
其后面是4040处理器(1974发布)，其具有扩展指令集、程序内存、寄存器集和堆栈。
Its successor was the 4040 processor (released in 1974), which had an expanded instruction set, program memory, register set, and stack.
此方案通过进行指令集扩展，可以方便的构建异构多核结构，而且还兼有同构多核结构的特点。
Heterogeneous structure, which also has the merit of homogeneous structure, can be constructed conveniently by instruction extension.
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