xmm15, RegXMM, RegRex, 7
// No type will make this register rejected for all purposes except
// for addressing. This saves creating one extra type for RIP.
-rip, BaseIndex, 0, 0
+rip, BaseIndex, 0, RegRip
// fp regs.
st(0), FloatReg|FloatAcc, 0, 0
st(1), FloatReg, 0, 1