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Level of Abstraction = Implementation layerISA：Instruction Set Architecture, ISA refers to the instructions and registers a CPU has available.
ABI：Application Binary Interface - 应用程序二进制接口, ABI refers to the calling conventions between functions, meaning what registers are used and what sizes the various C data types are.
API：Application Programming Interface
ISA, ABI, API区别
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原文地址：https://www.cnblogs.com/HeCG95/p/11612515.html