cgOp (LZExt (ITFixed from) (ITFixed to)) [x]
    | nativeTyWidth from < nativeTyWidth to = iCoerce ZExt from to x
cgOp (LZExt (ITFixed from) (ITFixed to)) [x]
    | nativeTyWidth from < nativeTyWidth to = iCoerce ZExt from to x
cgOp (LZExt (ITFixed from) (ITFixed to)) [x]
    | nativeTyWidth from < nativeTyWidth to = iCoerce ZExt from to x