prog.Reg = p.getRegister(prog, op, &a[1])
			prog.AddRestSourceArgs([]obj.Addr{a[2], a[3]})
			prog.To = a[4]
			break
		}
		if p.arch.Family == sys.AMD64 {
			prog.From = a[0]
			prog.AddRestSourceArgs([]obj.Addr{a[1], a[2], a[3]})
			prog.To = a[4]
			break
		}
		if p.arch.Family == sys.S390X {
			prog.From = a[0]
			prog.AddRestSourceArgs([]obj.Addr{a[1], a[2], a[3]})
			prog.To = a[4]
			break

	for i := range p.RestArgs {
		if p.RestArgs[i].Pos == Destination {
			return &p.RestArgs[i].Addr
		}
	}
	return nil
}

// AddRestSourceArgs assigns more than one source operands to p.RestArgs.
func (p *Prog) AddRestSourceArgs(args []Addr) {
	for i := range args {
		p.RestArgs = append(p.RestArgs, AddrPos{args[i], Source})
	}
}

// An As denotes an assembler opcode.

			p.Reg = r1
		}
	case ssa.OpS390XRXSBG:
		r2 := v.Args[1].Reg()
		i := v.Aux.(s390x.RotateParams)
		p := s.Prog(v.Op.Asm())
		p.From = obj.Addr{Type: obj.TYPE_CONST, Offset: int64(i.Start)}
		p.AddRestSourceArgs([]obj.Addr{
			{Type: obj.TYPE_CONST, Offset: int64(i.End)},
			{Type: obj.TYPE_CONST, Offset: int64(i.Amount)},
			{Type: obj.TYPE_REG, Reg: r2},
		})
		p.To = obj.Addr{Type: obj.TYPE_REG, Reg: v.Reg()}

		p := s.Prog(v.Op.Asm())
		p.To = obj.Addr{Type: obj.TYPE_REG, Reg: v.Reg()}
		p.Reg = v.Args[0].Reg()
		p.From = obj.Addr{Type: obj.TYPE_CONST, Offset: int64(sh)}
		p.AddRestSourceArgs([]obj.Addr{{Type: obj.TYPE_CONST, Offset: mb}, {Type: obj.TYPE_CONST, Offset: me}})
		// Auxint holds mask

	case ssa.OpPPC64RLDICL, ssa.OpPPC64RLDICLCC, ssa.OpPPC64RLDICR: