switch op {
	case arm64.AVTBL, arm64.AVTBX, arm64.AVMOVQ:
		return true
	}
	return false
}

// IsARM64CASP reports whether the op (as defined by an arm64.A*
// constant) is one of the CASP-like instructions, and its 2nd
// destination is a register pair that require special handling.
func IsARM64CASP(op obj.As) bool {
	switch op {
	case arm64.ACASPD, arm64.ACASPW:
		return true
	}
	return false
}

				}
				prog.RegTo2 = a[2].Reg
			case arch.IsARM64TBL(op):
				// one of its inputs does not fit into prog.Reg.
				prog.From = a[0]
				prog.AddRestSource(a[1])
				prog.To = a[2]
			case arch.IsARM64CASP(op):
				prog.From = a[0]
				prog.To = a[1]
				// both 1st operand and 3rd operand are (Rs, Rs+1) register pair.
				// And the register pair must be contiguous.