[NF] Various fixes.

- Unpack input arrays that have been packed after an external call.
- Fix ordering of initial algorithm sections.
- Type cast the branches of an if-expression instead of the whole
  expression.
- Fix expansion of cast expressions.

Belonging to [master]:
  - OpenModelica/OMCompiler#2906
  - OpenModelica/OpenModelica-testsuite#1116

Compiler/NFFrontEnd/NFConvertDAE.mo

@@ -875,7 +875,7 @@ function convertInitialAlgorithms
   input list<Algorithm> algorithms;
   input output list<DAE.Element> elements;
 algorithm
-  for alg in algorithms loop
+  for alg in listReverse(algorithms) loop
     elements := convertInitialAlgorithm(alg, elements);
   end for;
 end convertInitialAlgorithms;

Compiler/NFFrontEnd/NFExpandExp.mo

@@ -943,13 +943,11 @@ public
     input Type ty;
     output Expression outExp;
     output Boolean expanded;
-  protected
-    Type ety = Type.arrayElementType(ty);
   algorithm
     (outExp, expanded) := expand(exp);
 
     if expanded then
-      outExp := Expression.mapArrayElements(outExp, function Expression.typeCast(castTy = ety));
+      outExp := Expression.typeCastElements(outExp, ty);
     else
       outExp := exp;
     end if;

Compiler/NFFrontEnd/NFExpression.mo

@@ -817,7 +817,7 @@ public
   algorithm
     exp := match (exp, ty)
       local
-        Type t;
+        Type t, ety;
         list<Expression> el;
 
       case (INTEGER(), Type.REAL())
@@ -827,14 +827,20 @@ public
 
       case (ARRAY(ty = t, elements = el), _)
         algorithm
-          el := list(typeCastElements(e, ty) for e in el);
+          ety := Type.arrayElementType(ty);
+          el := list(typeCastElements(e, ety) for e in el);
           t := Type.setArrayElementType(t, ty);
         then
           ARRAY(t, el, exp.literal);
 
       case (UNARY(), _)
         then UNARY(exp.operator, typeCastElements(exp.exp, ty));
 
+      case (IF(), _)
+        then IF(exp.condition,
+                typeCastElements(exp.trueBranch, ty),
+                typeCastElements(exp.falseBranch, ty));
+
       else
         algorithm
           t := typeOf(exp);

Compiler/Template/CodegenCFunctions.tpl

@@ -2193,7 +2193,7 @@ template extFunCallVardecl(SimExtArg arg, Text &varDecls, Text &auxFunction, Boo
   case SIMEXTARG(isInput = true, isArray = true, type_ = ty, cref = c) then
     match expTypeShort(ty)
     case "integer" then
-      'pack_integer_array(&<%contextCref(c,contextFunction,&auxFunction)%>);'
+      'pack_integer_array(&<%contextCref(c,contextFunction,&auxFunction)%>);<%\n%>'
     else ""
   case SIMEXTARG(isInput = false, isArray = true, type_ = ty, cref = c) then
     match expTypeShort(ty)
@@ -2315,6 +2315,12 @@ template extFunCallVarcopy(SimExtArg arg, Text &auxFunction)
  "Helper to extFunCall."
 ::=
 match arg
+case SIMEXTARG(isInput = true, isArray = true, type_ = ty, cref = c) then
+  // Inputs that have been packed should be unpacked after the external call.
+  match expTypeShort(ty)
+  case "integer" then
+  'unpack_integer_array(&<%contextCref(c,contextFunction,&auxFunction)%>);'
+  else ""
 case SIMEXTARG(outputIndex=0) then ""
 case SIMEXTARG(outputIndex=oi, isArray=true, cref=c, type_=ty) then
   match expTypeShort(ty)