Messages in this thread | | | Date | Thu, 24 Jan 2013 09:35:29 -0600 | From | "H. Peter Anvin" <> | Subject | Re: [Suggestion] [x86]: Compiler Option Os is better on latest x86 |
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On 01/24/2013 09:25 AM, Borislav Petkov wrote: > On Thu, Jan 24, 2013 at 08:56:26AM -0600, H. Peter Anvin wrote: >> There has been occasional talk about a -Ok(ernel) option to gcc, but >> that would require someone to go through gcc and figure out what bits >> makes sense and which don't... > > Yep, such an option has a great potential for us and, if done right, > would be very cool. It could probably be taught to insert HWEIGHT, > RDRAND, CLFLUSH and whatever other insns we have the inline asm versions > for... and query CPUID before that... uuh, nice stuff. > > The alternative would be to fork gcc and call it kcc... > > /me runs away pretty quickly without even turning back :-) >
I don't expect we'll be teaching gcc about the alternatives mechanism. -Ok was about optimization, basically a "sane -Os".
-hpa
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