The GENERIC trees are converted into GIMPLE form and a subsequent control flow graph to support SSA-based optimizations.

generic树被转换成GIMPLE形式，进而转换成控制流图，以支持基于SSA的优化。

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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.

GCC 4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Static Single Assignment (ssa)形式。

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