MipsRegister: "v0" | "v1" | "a0" | "a1" | "a2" | "a3" | "t0" | "t1" | "t2" | "t3" | "t4" | "t5" | "t6" | "t7" | "s0" | "s1" | "s2" | "s3" | "s4" | "s5" | "s6" | "s7" | "t8" | "t9" | "k0" | "k1" | "gp" | "sp" | "fp" | "s8" | "ra" | "hi" | "lo" | "zero" | "at" | "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" | "10" | "11" | "12" | "13" | "14" | "15" | "16" | "17" | "18" | "19" | "20" | "21" | "22" | "23" | "24" | "25" | "26" | "27" | "28" | "29" | "30" | "31"