How to use DPC++ compiler for CPU with JIT support and SIMD code generation ?

[lohika-denis-kotov]

I have a question how to use DPC++ compiler for CPU with JIT support and SIMD code generation ?
It is need for some of the projects, for example https://github.com/openvinotoolkit/openvino/tree/master/src/plugins/intel_cpu plugin ...

I have not found the option for DPC++ compiler for such feature.
Closest what I have found is https://www.intel.com/content/www/us/en/develop/documentation/oneapi-dpcpp-cpp-compiler-dev-guide-and-reference/top/compiler-reference/compiler-options/code-generation-options/arch.html#arch, but this option is only available for Windows !!

Have somebody know how to do it ?

[lohika-denis-kotov]

One comment on technical side how it could be done.
On code generation side the following code could be compiled for first 2 dimensions could be parallelized using oneTBB library and last dimension could be parallelized using CPU SIMD instructions (SSE4.1, AVX2, AVX512 and etc.):

        cgh.parallel_for<class Fillbuffer>(
            accessor.get_range(), [=](cl::sycl::id<1> WIid1, cl::sycl::id<2> WIid2, cl::sycl::id<3> WIid3) {
                // Fill buffer with indexes
                
            });

[bader]

Please, ask this question at https://software.intel.com/en-us/forums/opencl forum. JIT phase is performed by OpenCL CPU and my knowledge most likely is not relevant for recent versions.

[lohika-denis-kotov]

@bader Okay, thanks !!

[lohika-denis-kotov]

OpenCL CPU implementation uses oneTBB to execute kernels in parallel. JIT compilation is used unless you explicitly specifying CPU target triple, which is not a default option.

@bader I've found that this statement contradict https://intel.github.io/llvm-docs/GetStartedGuide.html#cpu:

CPU AOT compiler opencl-aot is enabled by default ...

[bader]

No contradiction. This statement says that the build of opencl-aot tool is enabled by default. It's not the same as "DPC++ compiler uses AOT compilation mode for CPU device by default".

[lohika-denis-kotov]

Thanks, it is my misunderstood