Originally posted by indepe
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It is standard one and all others up and down are considered special cases. King -O0 is always king but because he is slow he is considered useful in development only, -O1 better for security and that just because you still want some optimization , -O2 standard, -O3 "safe" overclocking , -Ofast are you crazy?
Not to mention that clever apps combine these optimizations and compile this code with this meta optimization and another code with something else even non meta and so on
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