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OpenCL

sampie
Adept I

ROCM - How to compile kernel code

Hi,

Is it possible to compile OpenCL C 2.0 kernels separately in rocm environment?

I am trying OpenCL C 2.0 features and clBuildProgram seems to terminate with segfault. I am thinking that compiling with some other way might give some messages indicating what is wrong.

I have read that compiling OpenCL kernel is somehow related to clang. I have clang 4.0 on my system and I also see /opt/rocm/opencl/bin/x86_64/clang and /opt/rocm/bin/clang-ocl that came with ROCM 1.7.

If possible, with what command can I compile opencl (2.0) kernel file?

Thanks

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2 Replies
dipak
Staff
Staff

Re: ROCM - How to compile kernel code

First of all, if you're observing a crash in clBuildProgram, please report the issue here: Issues · RadeonOpenCompute/ROCm · GitHub . Actually,  ROCm has a separate GitHub place to report an issue or post a query related to it.

Regarding the offline compilation, both clang and clang-ocl tools can be used. I think clang-ocl is easier to use because it requires less number of flags.  Say,

>> clang-ocl simple.cl -o simple.o

or

>> clang-ocl simple.cl -mcpu=ARCH -o simple.o

Here ARCH denotes specific architecture, for example, gfx803 for Fiji or gfx900 for Vega.

Also  OpenCL 2.0 specific flags might be required for compiling OpenCL 2.0 kernels. As I haven't used it myself, I can't provide the exact command or steps. Please check ROCm community for more information.

Regards,

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sampie
Adept I

Re: ROCM - How to compile kernel code

Hi

I just did report the issue to ROCm github place.

I think following command might work. However, at the moment clang crashes during the compilation as well.

/opt/rocm/bin/clang-ocl -cl-std=CL2.0 -mcpu=gfx803 gpu.cl -o output.o

....

clang: error: unable to execute command: Segmentation fault (core dumped)

....

However, I recently found that ryzen has some kind of a bug: How serious is the AMD Ryzen segfault bug for "non-programmers"? I wonder if the I have affected Ryzen CPU causing issues.

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