// No type will make this register rejected for all purposes except
// for addressing. This saves creating one extra type for RIP.
rip, BaseIndex, 0, RegRip
+// No type will make these registers rejected for all purposes except
+// for addressing.
+eiz, BaseIndex, 0, RegEiz
+riz, BaseIndex, 0, RegRiz
// fp regs.
st(0), FloatReg|FloatAcc, 0, 0
st(1), FloatReg, 0, 1