llvm dev - Mar 2013 - [LLVMdev] UNREACHABLE executed! error while trying to generate PTX

Thanks a lot Justin,

I will remove the toolkit header. Just one last question..(maybe ;) ) If I
do away with toolkit headers it says unknown type name '__device__'.
Does
this function qualifier have an alternative ? or I can just do away with ?





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Not really.  Clang does not have a way to annotate device vs. kernel
functions in C/C++ mode.  You're probably better off trying to use OpenCL
or CUDA mode in clang.

In the clang unit tests, there is a cuda.h header that provides very basic
support for these keywords:  tests/SemaCUDA/cuda.h

If you compile as CUDA (use .cu extension, or "-x cuda") and use this
header, you will have basic support.  You can invoke clang with something
like:

$ clang test1.cu -Xclang -fcuda-is-device -I ../src/clang/test/SemaCUDA
-Xclang -triple -Xclang nvptx64 -Xclang -target-cpu -Xclang sm_20 -S

... assuming your clang source directory is ../src/clang, you want 64-bit
PTX, and your target SM is 2.0.  Adjust accordingly.

Clang also knows how to map OpenCL to PTX, so you would do something like:

$ clang test1.cl -Xclang -triple -Xclang nvptx64 -Xclang -target-cpu
-Xclang sm_20 -S



On Wed, Mar 20, 2013 at 3:29 PM, upit <uday_pitambare at yahoo.com> wrote:
> Thanks a lot Justin,
>
> I will remove the toolkit header. Just one last question..(maybe ;) ) If I
> do away with toolkit headers it says unknown type name
'__device__'. Does
> this function qualifier have an alternative ? or I can just do away with ?
>
>
>
>
>
> --
> View this message in context:
>
http://llvm.1065342.n5.nabble.com/UNREACHABLE-executed-error-while-trying-to-generate-PTX-tp56026p56093.html
> Sent from the LLVM - Dev mailing list archive at Nabble.com.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>


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Thanks,

Justin Holewinski
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Well, I tried the command line given by you and I get the following error

clang++ nbody.kernel.cu -Xclang -fcuda-is-device
-I/home/upitamba/llvm-3.2.src/tools/clang/test/SemaCUDA/ -Xclang -triple
-Xclang nvptx64 -Xclang -target-cpu -Xclang sm_10 -S

fatal error: error in backend: Cannot select: 0x334a870: v4f32
NVPTXISD::MoveParam 0x334a770 [ORD=1] [ID=22]
  0x334a770: v4f32 = TargetExternalSymbol'.PARAM0' [ID=1]
In function: computeBodyAccel

Am I doing anything wrong here ?

Attached my new  nbody.kernel.cu
<http://llvm.1065342.n5.nabble.com/file/n56141/nbody.kernel.cu>  .cu here






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