Web14 de sept. de 2024 · 优化等级 -O1 -O2 -O3 -Os -Ofast -Og 一下内容摘自 Using the GNU Compiler Collection (GCC) 一般来说,如果不指定优化标识的话,gcc就会产生可调试代码,每条指令之间将是独立的:可以在指令之间设置 断点 ,使用gdb中的 p命令查看变量的值,改变变量的值等。 并且把获取最快的编译速度作为它的目标。 当优化标识被启用之 … Web3 de sept. de 2024 · O3在O2的基础上进行更多的优化,例如使用伪寄存器网络,普通函数的内联,以及针对循环的更多优化。 Os主要是对代码大小的优化,我们基本不用做更多的关心。 通常各种优化都会打乱程序的结构,让调试工作变得无从着手。 并且会打乱执行顺序,依赖内存操作顺序的程序需要做相关处理才能确保程序的正确性。 -O0: 不做任何优化, …
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