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

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Message-ID: <47DC2F08.9080004@zytor.com>
Date:	Sat, 15 Mar 2008 21:18:16 +0100
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alexander van Heukelum <heukelum@...lshack.com>
CC:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: K8, EFFICEON and CORE2 support the cmovxx instructions.

Alexander van Heukelum wrote:
> K8, EFFICEON and CORE2 support the cmovxx instructions.
> 
> Instead of listing the cpu's that have support for the
> cmovxx instructions, list the cpu's that don't.
> 
> Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm>
> ---
> 
> A bit of playing resulted in:
> 
> CPUS="M386 M486 M586 M586TSC M586MMX M686 MPENTIUMII MPENTIUMIII"
> CPUS=$CPUS" MPENTIUMM MPENTIUM4 MK6 MK7 MK8 MCRUSOE MEFFICEON"
> CPUS=$CPUS" MWINCHIPC6 MWINCHIP2 MWINCHIP3D MGEODEGX1 MGEODE_LX"
> CPUS=$CPUS" MCYRIXIII MVIAC3_2 MVIAC7 MPSC MCORE2"
> 
> for cpu in $CPUS
> do
>         echo "CONFIG_${cpu}=y" > testconfig
>         make ARCH=i386 allnoconfig KCONFIG_ALLCONFIG=testconfig > /dev/null
>         echo ${cpu} >> result
>         grep X86_CMOV .config >> result
>         echo >> result
> done
> 
> I'm quite sure that K8, EFFICEON and CORE2 support HAVE_CMOV, but
> they did not set X86_CMOV.
> 

Crusoe has CMOV as well.

	-hpa
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