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OpenCL ahead-of-time compilation tool (opencl-aot)

OpenCL ahead-of-time compilation tool (opencl-aot) is a tool which generates device-dependent OpenCL program binary from SPIR-V binary primarily for Intel(R) processor devices.

Prerequisites

To use opencl-aot tool, you must have:

  • OpenCL runtime installed for the target device (see Install low level runtime)
  • OpenCL ICD Loader installed with support of OpenCL 2.1 or higher

How to use

opencl-aot tool is integrated with Clang. To use ahead-of-time compilation for SYCL application for Intel(R) processor device, run Clang with -fsycl-targets=spir64_x86_64-unknown-unknown-sycldevice option.

To enable optimizations for target CPU architecture, add -Xsycl-target-backend "-march=<arch>" option, where <arch> could be avx512, avx2, avx or sse4.2.

To execute opencl-aot directly for Intel(R) processor device, run it with <spv> -o=<output> --device=cpu, where <spv> is path to SPIR-V binary file, <output> is path to created OpenCL program binary file.

To generate SPIR-V binary file from OpenCL device kernel code, use Clang to generate LLVM IR and pass it to llvm-spirv tool. For more information about generation LLVM IR from OpenCL device kernel code, see OpenCL Features of Clang Compiler User's Manual.

For more information about opencl-aot tool, execute it with --help option.