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RFC-5: Reduce the number of string registers #5

@dr-orlovsky

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@dr-orlovsky

Reduce the number of string registers down to 32 (from current 256); maintain ISA byte dimensions by using mod 32 (or mod 16 if an operation uses two string register indexes) to determine specific string register.

This will reduce memory requirements for on-chip registers from current > 16MB down to ~ 2MB

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S-implementedThe change is implemented in the reference implementation but not yet a part of the specificationproposalProposal with specification enhancement

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