llvm dev - Mar 2016 - Compiling OpenMP for GPUs with there are function calls in the parallel regions

Hi,

Using the flow described here:
https://parallel-computing.pro/index.php/9-cuda/43-openmp-4-0-on-nvidia-cuda-gpus,
I can compile and run OpenMP code on GPUs when the parallel region is
self-contained (i.e., does not include calls to functions).


When the parallel region includes a call to a function (e.g., foo()), I get
this error.

nvlink error   : Undefined reference to 'foo' in
'/tmp/test.o-e8741d.cubin'


"foo" is indeed declared and defined in the same file before the main
function, but clang driver does not include it in the final PTX file
(test.s.tgt-nvptx64sm_30-nvidia-linux).



Using CUDA terminology, Is having "device functions" not supported yet
in
OpenMP ?


Thanks.
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Hi,
Most probably you forget to enclose definition of 'foo()' function in
'pragma omp declare target' region. You can do it like this:

#pragma omp declare target
void foo() {
...
}
#pragma omp end declare target



Best regards,
Alexey Bataev
============Software Engineer
Intel Compiler Team

11.03.2016 21:10, Ahmed ElTantawy via llvm-dev пишет:
Hi,

Using the flow described here:
https://parallel-computing.pro/index.php/9-cuda/43-openmp-4-0-on-nvidia-cuda-gpus,
I can compile and run OpenMP code on GPUs when the parallel region is
self-contained (i.e., does not include calls to functions).


When the parallel region includes a call to a function (e.g., foo()), I get this
error.

nvlink error   : Undefined reference to 'foo' in
'/tmp/test.o-e8741d.cubin'


"foo" is indeed declared and defined in the same file before the main
function, but clang driver does not include it in the final PTX file
(test.s.tgt-nvptx64sm_30-nvidia-linux).



Using CUDA terminology, Is having "device functions" not supported yet
in OpenMP ?


Thanks.



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