[LLVMdev] [PATCH ]Add Subtarget ptx23

[陳韋任]

Hi, Justin

  Thansk, but I have a little concern though. I saw Chiou mentioned the
compatibility issue of PTX on the mailing list.
  http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-March/038654.html

 In my PTX.td patch,

def FeaturePTX23 : SubtargetFeature<"ptx23", "PTXVersion", PTX_VERSION_2_3",
                                    "Use PTX Language Version 2.3",
                                    [FeaturePTX22]>;
 
  I can only guess above statement means PTX23 is fully compatible with
PTX22. Is my guess right? If so, how can one express that FeatureA is
NOT fully compatible with FeatureB in .td?

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667