Re: [PATCH] x86_64 : prefetchw() can fall back to prefetch() if !3DNOW

On Thu, Jul 28, 2005 at 07:10:41PM +0200, Eric Dumazet wrote:
> [PATCH] x86_64 : prefetchw() can fall back to prefetch() if !3DNOW
> 
> If the cpu lacks 3DNOW feature, we can use a normal prefetcht0 instruction 
> instead of NOP5.
> "prefetchw (%rxx)" and "prefetcht0 (%rxx)" have the same length, ranging 
> from 3 to 5 bytes
> depending on the register. So this patch even helps AMD64, shortening the 
> length of the code.

Looks good, thanks.

-Andi

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• References:
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    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH] x86_64: sync_tsc fix the race (so we can boot)
    • From: yhlu <[email protected]>
  • [PATCH] x86_64 : prefetchw() can fall back to prefetch() if !3DNOW
    • From: Eric Dumazet <[email protected]>

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