Intel® C++ Compiler 16.0 User and Reference Guide
Sets a barrier in the current thread. This topic only applies to Intel® 64 and IA-32 architectures targeting Intel® Graphics Technology.
void _gfx_gpgpu_thread_barrier();
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This function sets a barrier in the current thread that pauses execution of the thread until all other threads in the same thread group reach this barrier.
Use this function to pause a thread in a second-level nest if program logic requires it to wait for other threads in the same thread group. There is no implicit thread barrier at the end of a second-level nest.
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