From: Anu Thomas on
The default value of "Use memset to initialize floats and
doubles to 0.0" (Simulink Model >> Simulation >>
configuration parameters >> Optimization) property is
mentioned as "off" in help docs. But the GUI and
command-line shows the default as "on".

You can use the following to see that on command-line

>> get_param(gcs,'InitFltsAndDblsToZero')