Due to a problem in the Intel® FPGA SDK for OpenCL compiler legacy emulator version 18.1.1, the get_global_size function returns 0 instead of 2^32 for an autorun kernel. This may result in functional differences between the emulator and FPGA execution of the kernel.
Intel Software: Intel FPGA SDK for OpenCL, Quartus Prime
Last Modified: May 01, 2019
Version Found: v18.1 Update 1
Version Fixed: v19.1
Bug ID: 1409094402