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→General-Purpose Registers
* r0 through r30 - to refer generally to the registers
* x0 through x30 - for 64-bit-wide access (same registers)
* w0 through w30 - for 32-bit-wide access (same registers - upper 32 bits are either cleared on loador sign-extended (set to the value of the most significant bit of the loaded value)).
Register '31' is one of two registers depending on the instruction context: