Unlike GCC, which is a monolithic compiler released under the GPL, the LLVM family of tools are more modular - and thanks to a more permissive BSD license, can be embedded in commercial tools.
和基于GPL授权的单一编译器GCC不同的是，LLVM工具族更为模块化。而且得益于更为宽松的BSD授权，LLVM可以嵌入在商业工具中。
However, there is a big performance gap between it and the commercial UPC compilers, for lack of effective parallel compiler optimization support.
但由于缺乏有效的并行编译优化支持，其性能与商业UPC编译器相比，有着较大的差距。
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