Warp schrieb:


>> > In general POV-Ray compiles on 64bit systems but it won't be faster (in 
>> > most cases even slower).  The main advantage would be to be able to 
>> > address more than 4GB of memory.
> 
>> I couldn't believe this and did some testing with my own compilations of 
>> POVRay.
> 
>   As noted in other articles of this thread, there's a slight confusion
> of concepts here.
> 
>   64-bitness in itself does not bring any speed benefit to POV-Ray.
> There's nothing special in having 64-bit pointers (and long integers,
> which are not used almost anywhere in POV-Ray) which would bring
> extra speed.
>   However, making an AMD64-optimized binary can and most probably will
> give speed benefits. However, this is not because AMD64 is a 64-bit
> processor. It's because it has new features which the compiler can use
> to make faster code and which the 32-bit processors don't have.

And thats the point. A 64Bit-compile on an AMD64 box will increase the 
performance of POVRay. If this increase of performance is caused by the 
64-bitness or the increased number of (SSE) registers is meaningless. It 
_will_ be faster. Thats the point. And so a version of POVRay for 
WindowsXP 64Bit edition will bring advantages against a 32 Bit Version.

Tonight I am going to make some tests with different versions of POVRay 
and the official POVRay benchmark file and also with a file with a lots 
of spheres to test the influence of the memory interface.

-- 

mat### [at] matweide
http://www.matwei.de

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