AMD's changing policy on CAL ... why?

Discussion in 'GPGPU Technology & Programming' started by MfA, Dec 21, 2009.

  1. MfA

    MfA
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    It's strange, Prunedtree's code is showing what ATI's hardware can do when pushed. ATI also has some unique hardware features being held back by the effort of integrating it with OpenCL. Why are they killing CAL/IL now? (Or rather, stopping it's documentation.) Until Fermi ships they have a window where people are more likely to experiment with those features IMO.

    I don't really see the benefit in killing CAL/IL ... in fact it's a competitive shortfall as long as NVIDIA continues to support PTX.
     
  2. mhouston

    mhouston A little of this and that
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    CAL/IL is not being killed. Yes we are a little behind on documentation, and the post that you link to shows that most of those hardware features are not punched through IL just yet nor does CAL yet have all of the hooks.

    We will be exposing new features in OpenCL, which uses CAL and IL underneath, so they will be exposed in both places.
     
  3. trinibwoy

    trinibwoy Meh
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    Side question but are these hardware features used by the graphics drivers in some way? Cause I don't get why AMD would go through all the trouble of implementing hardware support and not expose it at all.
     
  4. mhouston

    mhouston A little of this and that
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    We don't put things in hardware on a whim... ;-)
     
  5. trinibwoy

    trinibwoy Meh
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    Thanks, that's comforting to know :)
     
  6. MfA

    MfA
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    Okay, lets say deprecated then.
    It uses your internal version inside it's bowels but that version won't necessarily be representative of what will be exposed to external developers.
     
  7. ryta1203

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    The problem is that the policy is still changing:

    Old policy: CAL/IL first, Brook+ second
    New policy: OpenCL first, CAL/IL second (maybe)...

    This is what Michael Chu has said anyways.
     
  8. MfA

    MfA
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    Well to be fair, since I said that they have released the machine code level specs for all the features ... I seriously doubt they would do that if they weren't going to get CAL up to date as well.
     
  9. Jawed

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  10. MfA

    MfA
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    I saw but I didn't want to bump my thread to show the world yet again I barked before I was bit :)
     
  11. DeanoC

    DeanoC Trust me, I'm a renderer person!
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    No CAL and Dx11, surely wouldn't have been hard? Or just not bothered due to compute shaders?

    Deano
     
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