func (c *ctxt7) omovlconst(as obj.As, p *obj.Prog, a *obj.Addr, rt int, os []uint32) (num uint8) {
	switch as {
	case AMOVW:
		d := uint32(a.Offset)
		// use MOVZW and MOVKW to load a constant to rt
		os[0] = c.opirr(p, AMOVZW)
		os[0] |= MOVCONST(int64(d), 0, rt)
		os[1] = c.opirr(p, AMOVKW)
		os[1] |= MOVCONST(int64(d), 1, rt)
		return 2

	case AMOVD: