GCC 4 的另一个有趣的变化是增加了一个循环向量器（基于 Tree SSA 框架）。
Another interesting change for GCC 4 is the addition of a loop vectorizer (based on the Tree SSA framework).
否则，它循环遍历绑定向量数组，寻找非null的绑定句柄指针。
Else, it goes through the binding vector array looking for a non-NULL pointer to binding handle.
可能会在这里构造一个循环，但是这与R的功能和面向向量的操作不一致。
You could construct a loop here, but that feels at odds with r's functional and vector-oriented operations. Instead, the trick is to use the function apply .
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