Passing PipeArray as template in functor

Question

Hi, I am trying to pass pipeArray through template in a functor.The pipeArray code in the following oneAPI sample directory was used: oneAPI-samples/DirectProgramming/C++SYCL_FPGA/include/pipe_utils.hppThe pipe array definition:// pipe array
using testPipeArray = fpga_tools::PipeArray&lt;class testPipeArrayId, Data_t, kDepth, kWidth&gt;;Functor code:template &lt;typename inPipe&gt;
class tileReadData{
public:
  Data_t *inMatPtr;
  unsigned total_reads;
  unsigned mem_base_addr;
  void operator()() const{
    Data_t * inMatLocated(inMatPtr);
    [[intel::initiation_interval(1)]]
    for (unsigned mem_idx = 0; mem_idx &lt; total_reads; mem_idx++) {
      fpga_tools::UnrolledLoop&lt;kWidth&gt;([&amp;](auto jdx) {
        inPipe::PipeAt&lt;jdx&gt;::write(inMatLocated[mem_base_addr + mem_idx * kWidth + jdx]);
      });
    }
  }
};Used in code:  // data read
  auto tileReadData_event = q.single_task&lt;tileReadDataId&gt;(
          tileReadData&lt;testPipeArray&gt;{inMat, total_reads, mem_base_addr});This code makes the following error messages:error: no member named 'write' in the global namespace; did you mean 'fwrite'?50 | inPipe::pipeAt&lt;jdx&gt;::write(inMatLocated[mem_base_addr + mem_idx * kWidth + jdx]); error: use of alias template 'PipeAt' requires template arguments error: SYCL kernel cannot call an undefined function without SYCL_EXTERNAL attributeThese error message does not come up when using pipe instead of pipearray (also without the unrolled loop). Is there a way that I can pass pipeArray in functor through template?Thanks

boonbengt_altera · Answer

Hi @JSYOO,Thank you for posting in Intel community forum, hope all is well and apologies for the delayed in response.Noted on the error message, may I know what oneAPI version that you are using to compile the mention example? Also what are the compilation command used?Hope to hear from you soon.Best WishesBB

jsyoo · Answer

Hi I attached the CMakeLists and the sample source code.I run the code on linux and it is running on oneAPI 2024.0 version because this is the only version I download for this machine.the commands were:$ mkdir build
$ cd build
$ cmake ..
$ make fpga_emuThe CMakeLists is based on the CmakeList from this repo:https://github.com/oneapi-src/oneAPI-samples/tree/master/DirectProgramming/C%2B%2BSYCL_FPGA/Tutorials/GettingStarted/fpga_template Thanks

boonbengt_altera · Answer

Hi @JSYOO,Noted on the version involved and code repo referred as well as shared sample code.Please do allow us some time to emulate the provided code and get back to you shortly.Thank you for the patientsBest WishesBB

boonbengt_altera · Answer

Hi @JSYOO,Thank you for the wait, this is to let you know that your request are still being worked on.Will get back to you sometime within this week.Appreciate the patients.Best WishesBB

boonbengt_altera · Answer

Hi @JSYOO,The compilation from our end seems to be working and we are able to generate the emulation files for the fpga template.Based on the error message seen per my understanding you are trying to use the pipe for IO and are facing some issues, there are example design available in the path below:- https://github.com/oneapi-src/oneAPI-samples/tree/master/DirectProgramming/C%2B%2BSYCL_FPGA/Tutorials/DesignPatterns/pipe_arrayPerhaps there seems to be some declaration gaps for the pipe, hence would suggest to refer to the sample as a references.Hope that clarifyBest WishesBB

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Passing PipeArray as template in functor

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