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CCS/AM3358: pru0 makro in ccs project for PRU

Part Number: AM3358

Tool/software: Code Composer Studio

When I create  CCS procjet for PRU a have autogenerated preprocessor key "pru0" in Properties>Build>PRU Compiler>Advanced Options>Predefined Symbols

What is it for? Is it just to tell which PRU core the software is designed for so i can change it to pru1. Or it controls some compiler internals?