That is, it is a parent of other optimizations, and setting JITC_COMPILEOPT=NALL, mean that all other JITspecific optimizations components are also disabled.

也就是说，这是进行其他优化的祖先；设置 JITC_COMPILEOPT=NALL 意味着所有其他 JIT 特有的优化组件也被禁用了。