x86: rel types and generated tests

internal/gen/util.go

@@ -0,0 +1,19 @@
+package gen
+
+// cross returns the cross product of the lists in x.
+func cross(x [][]string) [][]string {
+	r := [][]string{nil}
+	for _, s := range x {
+		var nxt [][]string
+		for _, pre := range r {
+			for _, a := range s {
+				concat := make([]string, len(pre), len(pre)+1)
+				copy(concat, pre)
+				concat = append(concat, a)
+				nxt = append(nxt, concat)
+			}
+		}
+		r = nxt
+	}
+	return r
+}