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Compiler/BEAGLEBK: Clarification for TI PRU ABI handling of R3.w0

user5199182
Prodigy 60 points

Part Number: BEAGLEBK

Tool/software: TI C/C++ Compiler

Hi,

Per SPRUHV7C, R3.w0 is an Expression Register. It is marked as neither "Save On Call", nor as "Save On Entry".  Could you please clarify how should this be interpreted?

Is R3.w0 supposed to be used as "Assembler Temporary Register"? Or perhaps it is reserved for some special purpose and should not be used at all?

Thanks,
Dimitar