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Gentoo with -march=native -mtune=native on x86(-64) or -mcpu=native everywhere else

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1 point

Doesn’t march=native imply mtune=native ?

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2 points

No. march is avaliable instructions and mtune is timings. mcpu does, but it is not used on x86 for some reason

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march=native does imply mtune=native, at least on gcc

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