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Date: Thu, 26 Jul 2012 23:39:59 +0200
From: Roman Divacky <rdivacky@freebsd.org>
To: Luigi Rizzo <luigi@FreeBSD.org>
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Subject: Re: svn commit: r238818 - head/sys/dev/netmap
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Why dont you use __builtin_prefetch() ?

On Thu, Jul 26, 2012 at 09:37:58PM +0000, Luigi Rizzo wrote:
> Author: luigi
> Date: Thu Jul 26 21:37:58 2012
> New Revision: 238818
> URL: http://svn.freebsd.org/changeset/base/238818
> 
> Log:
>   define prefetch as a noop on !x86
> 
> Modified:
>   head/sys/dev/netmap/netmap.c
> 
> Modified: head/sys/dev/netmap/netmap.c
> ==============================================================================
> --- head/sys/dev/netmap/netmap.c	Thu Jul 26 20:41:36 2012	(r238817)
> +++ head/sys/dev/netmap/netmap.c	Thu Jul 26 21:37:58 2012	(r238818)
> @@ -220,7 +220,11 @@ struct nm_bridge nm_bridges[NM_BRIDGES];
>  #ifndef linux
>  static inline void prefetch (const void *x)
>  {
> +#if defined(__i386__) || defined(__amd64__)
>          __asm volatile("prefetcht0 %0" :: "m" (*(const unsigned long *)x));
> +#else
> +	(void)x;
> +#endif
>  }
>  #endif /* !linux */
>