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The device compilation phase can be done online, i.e. during execution of an application using special API calls. It can mostly be done using OpenGL or using device-specific or proprietary APIs such as NEON on ARM and AVX on AMD hardware. For example Halide.
The device compilation phase can be done before execution using special API calls. The modern GPU pipeline is driven by an abstract machine called HSAIL (Heterogeneous System Architecture Intermediate Language). The HSAIL Intermediate Language part of the specification is a key part of HSAIL design and is a step closer to the abstraction of the GPU pipeline.
Device compilation is one step closer to native operating system access given the similarities with WebGL and OpenGL on the desktop. This closely resembles HSAIL on the ARM CPU model. The effort to do so is a trade-off to drop the performance compared to custom machine code. It should however be possible to get the performance increase on that front as well. The effort to do so has been tried to be done for a while.
The device compilation phase can be done online, i.e. during execution of an application using special API calls. It can alternatively be compiled before executing the application into the machine binary or special portable intermediate representation defined by Khronos called SPIR-V. There are also domain specific languages and frameworks that can compile to OpenCL either using source-to-source translations or generating binary/SPIR-V, for example Halide. d2c66b5586