6.37 __mcall_is_in_vbase(D, f)

Results in {TRUE} if f is a nonstatic member function found in a virtual base class of D, otherwise {FALSE}.

If it returns {TRUE} the this adjustment must be done using __mcall_offsetof_vbase(D, f), otherwise it must be done with __mcall_this_offset(D, f).
Related concepts
6.35 Compiler-supported keywords for calling class member functions in embedded assembler
6.42 Calling a nonvirtual member function
6.43 Calling a virtual member function
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