GCC 4 brings many changes to the standard compiler suite, the biggest of which is around support for optimizations with the introduction of the tree Static Single Assignment (SSA) form.
GCC4为标准的编译器套件带来了很多变化，最大的变化是为了支持优化而引入的树的StaticSingleAssignment (ssa)形式。
Another interesting change for GCC 4 is the addition of a loop vectorizer (based on the Tree SSA framework).
GCC4 的另一个有趣的变化是增加了一个循环向量器（基于TreeSSA框架）。
Another interesting change for GCC 4 is the addition of a loop vectorizer (based on the Tree SSA framework).
GCC4 的另一个有趣的变化是增加了一个循环向量器（基于TreeSSA框架）。
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