What are the best compiler options for optimization?

What are the best compiler options for optimization?

The best compiler options for optimization can vary depending on the compiler you're using. For GCC, options like -O2 and -O3 are commonly used for general optimization. Do you have a specific compiler in mind?

I'm using GCC. What does -O2 and -O3 do?

The -O2 option enables a good level of optimization without significantly increasing compilation time. It includes optimizations like dead code elimination and loop unrolling. The -O3 option goes further, enabling more aggressive optimizations, which can improve performance but may increase compile time and binary size.

Are there any trade-offs with using -O3?

Yes, using -O3 can lead to larger binaries and longer compilation times. It may also introduce some instability in rare cases, so it's important to test your application thoroughly after using it.

What about other compilers like Clang or MSVC?

For Clang, you can use similar options like -O2 and -O3. MSVC has /O2 for maximum optimization and /Ox for full optimization, which includes additional optimizations. Each compiler has its own set of options, so it's good to check the documentation.