Why do I see the same IP simulation file listed twice in the msim_setup.tcl file generated by Qsys?

Description

In the Quartus® II software version 11.1 and later, you may see both an encrypted version and unencrypted version of the same IP simulation file in your msim_setup.tcl file generated by Qsys. The IP simulation files are encrypted to allow for mixed-language simulation in case the user has a single-language ModelSim license. The encrypted versions are located in the mentor subdirectory. For example, you may see the following lines in your msim_setup.tcl file:

vlog -sv "/submodules/altera_xcvr_functions.sv" -work JTAGMaster_alt_xcvr_reconfig_0
vlog -sv "/submodules/mentor/altera_xcvr_functions.sv" -work JTAGMaster_alt_xcvr_reconfig_0

Resolution

To avoid longer compilation time, if you have a license for mixed-language ModelSim simulation, comment out the file in the mentor subdirectory. If you have a license for single-language ModelSim simulation, only compile the file in the mentor subdirectory.

This issue is scheduled to be fixed in a future release of the Quartus II software.