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Message-ID: <20071026114510.GD30533@stusta.de> Date: Fri, 26 Oct 2007 13:45:10 +0200 From: Adrian Bunk <bunk@...nel.org> To: Pádraig Brady <P@...igBrady.com> Cc: Michael Lothian <mike@...eburn.co.uk>, linux-kernel@...r.kernel.org Subject: Re: Possibility of adding -march=native to x86 On Fri, Oct 26, 2007 at 11:41:18AM +0100, Pádraig Brady wrote: > Adrian Bunk wrote: > > On Thu, Oct 25, 2007 at 09:12:45PM +0100, Michael Lothian wrote: > >>> The MPENTIUM4 option does not only set -march=pentium4, it also enables > >>> several other options in arch/i386/Kconfig.cpu resulting in better > >>> performance. > >> How about an autodetect to set the right options here too using cpuid? > >> > >> With a warning of course that the code produced will be specifically > >> for the native cpu that it's compiled on. > > > > If you don't know or can figure out yourself the CPU you have, you'd > > better not compile your own kernel... > > There also is the added variable of what your version of gcc supports. > The kernel gcc options would have to be the highest common factor. > See also http://www.pixelbeat.org/scripts/gcccpuopt arch/i386/Makefile.cpu already does more or less the same. > Pádraig. cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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