As opposed to the C++ code, above we can see bar case precedes foo case. Since foo case is
unlikely, and instructions of bar are pushed to the pipeline, thrashing the pipeline is unlikely.
This is a good exploitation of a modern CPU
__builtin_expect(x,0)
于 2023-11-15 23:19:34 首次发布
本文讨论了在C++代码中，通过将不太可能发生的foocase指令置于barcase之前，可以有效利用现代CPU的特性，减少pipelinethrashing，从而提高执行效率。
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