{regAddr(REG_Y0), Yyr},
		{regAddr(REG_Y6), Yyr},
		{regAddr(REG_Y13), Yyr},
		{regAddr(REG_Y20), YyrEvex},
		{regAddr(REG_Y31), YyrEvex},
		{regAddr(REG_Z0), Yzr},
		{regAddr(REG_Z6), Yzr},
		{regAddr(REG_K0), Yk0},
		{regAddr(REG_K5), Yknot0},
		{regAddr(REG_K7), Yknot0},
		{regAddr(REG_CS), Ycs},
		{regAddr(REG_SS), Yss},
		{regAddr(REG_DS), Yds},
		{regAddr(REG_ES), Yes},
		{regAddr(REG_FS), Yfs},

		REG_Z0 + 30,
		REG_Z0 + 31:
		if ctxt.Arch.Family == sys.I386 {
			return Yxxx
		}
		return Yzr

	case REG_K0:
		return Yk0

	case REG_K0 + 1,
		REG_K0 + 2,
		REG_K0 + 3,
		REG_K0 + 4,
		REG_K0 + 5,
		REG_K0 + 6,
		REG_K0 + 7:
		return Yknot0

	case REG_CS:
		return Ycs
	case REG_SS:
		return Yss
	case REG_DS:
		return Yds