Christian.Thalinger at Sun.COM
Mon Feb 23 05:05:18 PST 2009
On Mon, 2009-02-23 at 07:29 -0500, Paul Hohensee wrote:
> Imo, the #ifdef's are ok in this case because they're quite limited.
> Vladimir set prefetch distances based on experiment. The difference
> between 320 and 384 is a single cache line. It seems to me that 32
> and 64-bit would be the same because it's the same hardware, except
> that it may be that 64-bit code is faster than 32-bit code, thus would
> require a slightly greater prefetch distance.
> 32-bit doesn't use the Prefetchxxx switches because there's no common
> prefetch instruction for 32-bit that can be used in C++ code. #ifdef is
> ok here.
Paul, thank you for the explanation. Last question: should I use the
_LP64 or AMD64 define?
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