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The basic integer instruction sets are:
- RV32I (32 registers, basic 32-bit integer instructions, control instructions (branch/jmp), load/store memory instructions, syscalls, memory ordering instructions (fences to avoid issues with out-of-order execution))
- RV32E (RV32I with 16 registers instead of 32)
- RV64I (RV32I with 64-bit integer instructions and address space)
- RV128I (RV64I with 128-bit integer instructions and address space)