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The TI compiler supports the "register" keyword (to suggest that variables be allocated into registers) as well as a global_register={r4|r5} option (for reserving registers for use by the user). If you're working with MSP430, please see the MSP430 Compiler Users Guide for more information. Also, just FYI, in case you weren't already aware, the CCS Users Guide for MSP430 also has other tips for migrating from IAR to CCS.