merge vm_version_x86_{32,64}.hpp

[Paul Hohensee]

Use _LP64.  AMD64 is amd processor-specific, while _LP64 is generic 64-bit.

Paul

Christian Thalinger wrote:
> 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?
>
> -- Christian
>
>