增量编译技术，其基本原理就是根据前一次编译的结果，只重新编译部分修改过设计，其它部分则沿用前一次编译的结果，这样就可以缩短总体的编译时间(Incremental compilation technology, the basic principle is based on the results of the previous compilation, only re-editing part of the modified design, the other part is based on the results of the previous compilation, so that you can shorten the overall compile time)