Excessive logic utilization from memmove

Can you explain why dereferencing "h->rep" consumes a lot of logic? I've tried putting the required work items down to zero and making the kernel a task kernel. Neither approach has any affect on the resource utilization in my code. Admittedly, I'm a newbie to OpenCL and FPGA development. I've read through the Altera optimization guide, but haven't found much in there that explains the magic under the covers.