Unexpected OpenCL compilation results

I cannot compile your code to check the report without the "funcs.h" header. I would assume you are talking about lines 92 and 97. I cannot see any reason why those accesses should not be coalesced. Is the compiler inferring one 32-bit access for each buffer or 16 per buffer? If it is just one, then parts of your circuit are being optimized out for some reason. If it is 16, the compiler is refusing to coalesce the accesses for some reason. The reason could, for example, be the configuration of the A_local and B_local buffers which will very likely be implemented as multi-ported RAMs. If the compiler decides to use a 32-bit width for those buffers based on the access pattern in the "megaCfunction"s, then it would not coalesce the accesses to either the global buffers or the local buffers in lines 92 and 97. You should probably check the width, depth and number of accesses to the local buffers in the report.