[Beignet] LuxRays vs Beignet: next steps

[Zou, Nanhai]

Yes, 64 bit integer is not available for IVB hardware.
Maybe need find a way to walk around this issue.

Thanks
Zou Nanhai

-----Original Message-----
From: beignet-bounces+nanhai.zou=intel.com at lists.freedesktop.org [mailto:beignet-bounces+nanhai.zou=intel.com at lists.freedesktop.org] On Behalf Of Lu, Guanqun
Sent: Wednesday, April 24, 2013 9:40 AM
To: Simon Richter; beignet at lists.freedesktop.org
Subject: Re: [Beignet] LuxRays vs Beignet: next steps

about your 3rd item, 64 bit is not natively supported on our opencl yet. It requires a lot of work...

So maybe for the current status, you might have to mimic 64 bit integer with two 32 integers, but that sounds awkward and buggy.

> -----Original Message-----
> From: beignet-bounces+guanqun.lu=intel.com at lists.freedesktop.org
> [mailto:beignet-bounces+guanqun.lu=intel.com at lists.freedesktop.org] On 
> Behalf Of Simon Richter
> Sent: Tuesday, April 23, 2013 6:49 PM
> To: beignet at lists.freedesktop.org
> Subject: [Beignet] LuxRays vs Beignet: next steps
> 
> Hi,
> 
> I'm still trying to get LuxRays to work on Beignet. LuxRays can run in 
> two modes, with or without using images on the GPU side as storage.
> 
> With images, the current blockers are:
> 
> 1. get_image_width is not available
> 
> That should be solvable, I think, and this is probably the next thing 
> I'm going to be looking at.
> 
> 2. sampler_t initialization with flags does not compile
> 
> This is more difficult. sampler_t is a pointer to an int that lives in 
> a special area, so I wonder how I should go about creating that from 
> the flags parameter. Do I allocate a sampler variable there and have 
> sampler_t behave as a smart pointer?
> 
> Without images, it is mainly assertions during compilation:
> 
> 3. LOADI does not handle 64 bit integers
> 
> Not sure if that can be easily handled. That will require a rainy weekend or two.
> 
> 4. LOADI does not handle booleans
> 
> As far as I can see, there is no native boolean type, so it would boil 
> down to integers. For select() to work, the value representing "true"
> should at least have the MSB set, but I think it might also make sense 
> to create a different internal type that is similar to an integer but 
> has different semantics.
> 
> 5. Booleans cannot be used in Phi nodes.
> 
> This appears to be related to the missing LOADI boolean support -- a 
> Phi node where a source path has a fixed value will need a preceding 
> LOADI
> -- so I think that is solved when LOADI is fixed.
> 
>    Simon
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