OpenCL Host Channel or Host Pipes

Current Pipes/Channels Restrictions

*Channels can have multiple read call sites, but only a single write call site

*Pipes can have only a single read and a single write call site

*Loop containing pipes or channel writes cannot be unrolled

*Kernels with channels can’t be vectorized (num_simd_work_items)

*Kernels CU with channels likely cannot be replicated (num_compute_unit)

– Unless max_global_work_dim(0) applied

*Dynamic indexing into arrays of channel IDs not supported

–Only static indexing supported

–AOC needs to know how to connect to HW at compile time