This white paper is second in series of white papers on OpenCL describing status of OpenCL implementation and available tools for developers using Intel OpenCL SDK.

The Intel OpenCL 1.1 specification Beta implementation for CPU (Core 2 Duo (Penryn) or later CPUs) can be retrieved from http://software.intel.com/en-us/articles/opencl-sdk. It is still evolving into a mature product so feel free to try it and provide feedback to us. At present it only runs on Linux* (only 64 bit), Windows 7* (with SP1) and Vista* operating systems (32 and 64 bit).

The Intel implementation is the only implementation at the moment that implements out of order queues. Intel’s implementation also allows multiple work-items per workgroup for CPUs. There is also preview support for device fission extension (not fully validated). We will cover the benefit of such options later in this whitepaper. With this implementation, you will also receive OpenCL offline compiler. This compiler will let you observe assembly instructions and intermediate representation (IR) of your OpenCL kernels instantly without having to plug them into a program or using any APIs to get IR. Developers can use this tool to also compile kernels for correctness.

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