Code Replacement happens after optimizations, so inlining and other optimizations can change function signatures that are involved in Code Replacement.
In order to protect a particular block or subsystem from optimizations, make the input signals global.
This can be done using Test Points or Global Storage Classes.
Run the below command in your MATLAB instance to access the release specific documentations on the same:
Test Points:
web(fullfile(docroot, 'simulink/ug/working-with-test-points.html'))
Global Storage Class:
web(fullfile(docroot, 'rtw/ug/apply-storage-classes-to-data.html'))
In order to create an easily-reusable subsystem that will always be protected from optimizations, add the block to a subsystem in a library, and make the inputs global.
This subsystem from the library can now be used to prevent optimizations from interfering with Code Replacement, without having to modify any other signal properties.
As an example, see the attached library, which has each input's Storage Class set to SimulinkGlobal.
Please follow the below link to search for the required information regarding the current release:
