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Asked: 2026-05-28T05:42:42+00:00

I’ve got a question in one of my tests that asked me to answer

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I’ve got a question in one of my tests that asked me to answer what switch statement produce the least efficient machine code. The possible answers were O4, O1, O2, or O3. I don’t event know what those are supposed to mean.

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  1. Editorial Team

    GCC Options That Control Optimization

    -O
    -O1
    Optimize. Optimizing compilation takes somewhat more time, and a lot more memory for a large function.

    -O2
    Optimize even more. GCC performs nearly all supported optimizations that do not involve a space-speed tradeoff. As compared to -O, this option increases both compilation time and the performance of the generated code.

    -O3
    Optimize yet more

    -Os
    Optimize for size.

    -Ofast
    Disregard strict standards compliance. -Ofast enables all -O3 optimizations. It also enables optimizations that are not valid for all standard compliant programs

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