lbr_from_signext_quirk_wr
val_tmp = lbr_from_signext_quirk_wr(val_tmp);
val_old = lbr_from_signext_quirk_wr(val_old);
val = lbr_from_signext_quirk_wr(val);
u64 lbr_from_signext_quirk_wr(u64 val);