Re: K8, EFFICEON and CORE2 support the cmovxx instructions.

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To: Alexander van Heukelum <heukelum@...>

Cc: H. Peter Anvin <hpa@...>, Alexander van Heukelum <heukelum@...>, Ingo Molnar <mingo@...>, Andi Kleen <andi@...>, Jeremy Fitzhardinge <jeremy@...>, Thomas Gleixner <tglx@...>, LKML <linux-kernel@...>

Subject: Re: K8, EFFICEON and CORE2 support the cmovxx instructions.

Date: Saturday, March 15, 2008 - 5:11 pm

On Sat, Mar 15, 2008 at 10:06:32PM +0100, Alexander van Heukelum wrote:
quoted text> > > I'm quite sure that K8, EFFICEON and CORE2 support HAVE_CMOV, but
> > > they did not set X86_CMOV.
> > > 
> > 
> > Crusoe has CMOV as well.

So does GEODE_LX BTW

quoted text> I believe you... and the Makefile_32.cpu: it gets a -march=i686. I
> also found out that I missed X86_ELAN, which is treated as a i486.
> 
> Also, MGEODE_LX does not get any optimization flags. I think that
> is unintentional, but what should they be?

in my experience (on user-space code), optimizing for "i586" gives
good results. However, the cache is small, so everything which can
reduce code size (especially loop/jump/function alignment) is worth
checking.

Regards,
Willy

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Messages in current thread:

[PATCH] x86: merge the simple bitops and move them to bitops.h, Alexander van Heukelum, (Wed Mar 12, 4:01 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Jeremy Fitzhardinge, (Fri Mar 14, 2:07 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Alexander van Heukelum, (Fri Mar 14, 3:43 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Jeremy Fitzhardinge, (Fri Mar 14, 5:15 pm)

[PATCH v2] x86: merge the simple bitops and move them to bit..., Alexander van Heukelum, (Fri Mar 14, 4:35 pm)

Re: [PATCH v2] x86: merge the simple bitops and move them to..., Randy Dunlap, (Fri Mar 14, 7:30 pm)

[PATCH v3] x86: merge the simple bitops and move them to bit..., Alexander van Heukelum, (Sat Mar 15, 8:04 am)

Re: [PATCH v3] x86: merge the simple bitops and move them to..., Ingo Molnar, (Fri Mar 21, 8:35 am)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Andi Kleen, (Fri Mar 14, 3:55 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Alexander van Heukelum, (Fri Mar 14, 5:33 pm)

K8, EFFICEON and CORE2 support the cmovxx instructions., Alexander van Heukelum, (Sat Mar 15, 3:19 pm)

Re: K8, EFFICEON and CORE2 support the cmovxx instructions., H. Peter Anvin, (Sat Mar 15, 4:18 pm)

Re: K8, EFFICEON and CORE2 support the cmovxx instructions., Alexander van Heukelum, (Sat Mar 15, 5:06 pm)

Re: K8, EFFICEON and CORE2 support the cmovxx instructions., Willy Tarreau, (Sat Mar 15, 5:11 pm)

[PATCH] x86: K8, GEODE_LX, CRUSOE, EFFICEON and CORE2 suppor..., Alexander van Heukelum, (Sun Mar 16, 9:16 am)

Re: [PATCH] x86: K8, GEODE_LX, CRUSOE, EFFICEON and CORE2 su..., Ingo Molnar, (Fri Mar 21, 8:38 am)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Andi Kleen, (Fri Mar 14, 5:42 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Alexander van Heukelum, (Fri Mar 14, 6:01 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Andi Kleen, (Fri Mar 14, 6:18 pm)

Re: [PATCH] x86: merge the simple bitops and move them to bi..., Alexander van Heukelum, (Sat Mar 15, 1:54 pm)


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Re: K8, EFFICEON and CORE2 support the cmovxx instructions.

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