Why `Register` Is Used in Djbx33A Hash Algorithm?

I see register is used here.

But I don't why it is specified as register. It seems the reasons listed here don't apply.

Could anybody let me know why register is needed in the DJBX33A hash algorithm?

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Robert Thorne

Robert Thorne

Automotive & Future Transportation Editor

Robert Thorne covers electric vehicle innovations, autonomous driving systems, global mobility trends, and automotive engineering developments.

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