return regVal(r, REG_F0, REG_F31)
}

// regAddr extracts a register from an Addr.
func regAddr(a obj.Addr, min, max uint32) uint32 {
	if a.Type != obj.TYPE_REG {
		panic(fmt.Sprintf("ill typed: %+v", a))
	}
	return regVal(uint32(a.Reg), min, max)
}

// regIAddr extracts the integer register from an Addr.
func regIAddr(a obj.Addr) uint32 {
	return regAddr(a, REG_X0, REG_X31)
}

		{regAddr(REG_X6), Yxr},
		{regAddr(REG_X13), Yxr},
		{regAddr(REG_X20), YxrEvex},
		{regAddr(REG_X31), YxrEvex},
		{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},

			Reg:    REG_R0,
			Offset: 0, // panic.argp
		}

		p := s.Func().Text
		p = appendp(p, AMOVD, gpanic, regAddr(REG_R0))

		p = appendp(p, AGet, regAddr(REG_R0))
		p = appendp(p, AI64Eqz)
		p = appendp(p, ANot)
		p = appendp(p, AIf)

		p = appendp(p, AGet, regAddr(REG_SP))
		p = appendp(p, AI64ExtendI32U)
		p = appendp(p, AI64Const, constAddr(framesize+8))
		p = appendp(p, AI64Add)