In this optimization, the value of a common subexpression is calculated once.

在此优化中, 计算一次公共子表达式的值.

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For global common subexpression optimization, the compiler searches entire functions for common subexpressions.

对于全局公共子表达式优化, 编译器搜索全部函数中的公共子表达式.

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For local common subexpression optimization, the compiler examines short sections of code for common subexpressions.

对于局部公共子表达式优化, 编译器检查公共子表达式的一小部分代码.

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