if p.arch.Family == sys.PPC64 && arch.IsPPC64NEG(op) {
			// NEG: From and To are both a[0].
			prog.To = a[0]
			prog.From = a[0]
			break
		}
	case 2:
		if p.arch.Family == sys.ARM {
			if arch.IsARMCMP(op) {
				prog.From = a[0]
				prog.Reg = p.getRegister(prog, op, &a[1])
				break
			}
			// Strange special cases.
			if arch.IsARMFloatCmp(op) {
				prog.From = a[0]