Am 25.07.2011 19:02, schrieb jhu:
> ATI and NVidia GPUs have had 64-bit float since 2008. I would imagine parts of
> Povray could be rewritten with OpenCL to take advantage of these things. GPUs
> are fairly general purpose nowadays.
>
>
Note that support for double precision floating point types is *not* 
part of the OpenCL 1.1 specification but just an optional implementor 
specific feature.
As a matter of fact AMD's OpenCL implementation (BTW meanwhile called 
"APP" and no longer "Stream") does not support doubles neither does 
NVidia's.
The only platform that does actually support 64-bit floats is Intels 
OpenCL SDK - and it's JIT compiler does in fact an amazing job in 
automatically vectorizing and optimizing for SSE2/3/4 registers 
depending on the used platform - but obviously it does not support any GPU.
So the funny situation ATM: if you have an AMD processor you'll need the 
Intel OpenCL SDK installed to get support for doubles within OpenCL for 
your AMD CPU and exactly zero OpenCL platfoms support 64bit floats for 
GPU's.

-Ive

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