how to tell gcc to maximum optimize build for target platform only?

Asked Nov 13 '14 at 17:26

Active Nov 13 '14 at 17:26

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I plan to use my application only on one computer, which I use to compile it. What would be the easiset way to tell gcc to apply all possible platform-specific optimizations?

Assuming that I have Xeon E5 v1 PC should I just add -march=core-avx-i as suggested here? Or I should do more / something else?

I'm using RHEL 7, gcc 4.8.2

edited May 23 '17 at 10:26

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asked Nov 13 '14 at 17:26

Oleg Vazhnev

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`-march=native` tells to compile for this platform. – Marc Glisse Nov 13 '14 at 17:37
thanks, if this enough or I should add some more options? – Oleg Vazhnev Nov 13 '14 at 17:41
It is in addition to all the usual, `-O3`, etc. – Marc Glisse Nov 13 '14 at 17:42
Try `-march=native -Ofast -funroll-loops`. – Z boson Nov 14 '14 at 08:54
@Zboson it's interesting. is it safe to use these options? why they not enabled by default? what else options should I use? probably someone can summarize and can get complete and verified list of options. – Oleg Vazhnev Nov 14 '14 at 11:31
`-Ofast` might not be "safe". It allows floating point math to be associative which breaks IEEE rules. It means the result may be different on different hardware. If this is a problem for you then use `-O3`. – Z boson Nov 14 '14 at 11:39

how to tell gcc to maximum optimize build for target platform only?

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