+A special "multidef" may be used inside a multiclass to generate +several defs given a list of values. +
+ +
+class Base<int i> {
+ int value = i;
+}
+
+multiclass Multi<list<int> values> {
+ def ONE : Base<values[0]>;
+ def TWO : Base<values[1]>;
+
+ multidef COUNT<values, int v, 2> : Base<:v>;
+}
+
+defm List : Multi<[1, 2, 3, 4, 5, 6]<;
+...
+
+// Results
+def ListCOUNT {
+ int v = ?;
+ int value = v;
+ list Multi::values = [1, 2, 3, 4, 5, 6];
+}
+def ListONE {
+ int value = 1;
+}
+def ListTWO {
+ int value = 2;
+}
+def MD2.ListCOUNT {
+ int value = 3;
+}
+def MD3.ListCOUNT {
+ int value = 4;
+}
+def MD4.ListCOUNT {
+ int value = 5;
+}
+def MD5.ListCOUNT {
+ int value = 6;
+}
+
++A multidef takes three "arguments" in the <> notation after the multidef +name. The first is a list of items to process. The second is a declaration. +This declaration creates a temporary name used as an iterator. It picks up the +value of each processed list item as TableGen generates defs from the multidef. +This temporary may be named and passed into the multidef body as shown in the +example above. This provides a powerful way to generate defs with various +values from a single multidef. The final "argument" is an integer value +indicating where in the list to begin processing. In the above example we +chose to begin list processing with the third item (index 2). +