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Re: [Mingw-users] GCC compiled code very slow compared to MS Visual C
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From: Reini U. <ru...@x-...> - 2011-01-24 09:10:44
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2011/1/23 Jeremy Hall <gcc...@gm...>: > I only use doubles, not long doubles. I thought -mpc80 caused 80bit > intermediate arithmetic to be used with the > 387; which is the default for Linux GCC anyway, Try -march=pentium4 -mfpmath=sse -mieee-fp -mmmx -msse -msse2 -fexcess-precision=standard to get compareble sse math within gcc (-fexcess-precision=standard only sinced 4.5) See http://blog.andreas.org/display?id=9 > I tried removing SSE from the VC build and it did slow down the VC run > a little, but only a few percent. > Interesting! > > Really, I was surprised GCC didn't produce faster code given the > effort that lots of very clever people > put into the optimizer, and you can see, in general, the assembler > produced is much more sophisticated. > MS hardly seem to develop VC, it doesn't even support C99 after 11 years, > > Still, now I have started using MinGW, its so nice to be using the > same compiler on all platforms, have decent warnings, have C99 support > etc. > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > MinGW-users mailing list > Min...@li... > > This list observes the Etiquette found at > http://www.mingw.org/Mailing_Lists. > We ask that you be polite and do the same. Disregard for the list etiquette may cause your account to be moderated. > > _______________________________________________ > You may change your MinGW Account Options or unsubscribe at: > https://lists.sourceforge.net/lists/listinfo/mingw-users > Also: mailto:min...@li...?subject=unsubscribe > -- Reini Urban http://phpwiki.org/ http://murbreak.at/ |
