DC综合基本概念:set_compile_directives

控制high-level 优化操作在cells,hierarchical pins,references,designs,library cells。

set_compile_directives 

object_list

[-delete_unloaded_gate true | false]删除unloaded gates

[-constant_propagation true | false]允许constant 传递通过cells 或者hier pins指定在object_list中,当为true时。

[-phase_inversion true | false]在boundary 优化过程中允许inverters 跨hier boundary 移动

[-location_optimization true | false]

[-critical_path_resynthesis true | false]

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