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C/C++ COMPILER->Compiler command line options->Enable Advanced Features (/Oc)

The /Oc option enables the Advanced Features of the compiler.

The /Og and /Or options are ignored when this option is enabled.

Data flow analysis is carried out and a completely different register allocation scheme is used when this option is specified.  Additional optimisations are also carried out.  Other options such as function in-lining become available and alternative calling conventions can be specified.