+/* Write to FILE the alias graph of data references DRS. */
+
+static inline bool
+write_alias_graph_to_ascii_dimacs (FILE *file, char *comment,
+ VEC (data_reference_p, heap) *drs)
+{
+ int num_vertex = VEC_length (data_reference_p, drs);
+ int edge_num = 0;
+ data_reference_p dr1, dr2;
+ int i, j;
+
+ if (num_vertex == 0)
+ return true;
+
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
+ for (j = i + 1; VEC_iterate (data_reference_p, drs, j, dr2); j++)
+ if (dr_may_alias_p (dr1, dr2))
+ edge_num++;
+
+ fprintf (file, "$\n");
+
+ if (comment)
+ fprintf (file, "c %s\n", comment);
+
+ fprintf (file, "p edge %d %d\n", num_vertex, edge_num);
+
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
+ for (j = i + 1; VEC_iterate (data_reference_p, drs, j, dr2); j++)
+ if (dr_may_alias_p (dr1, dr2))
+ fprintf (file, "e %d %d\n", i + 1, j + 1);
+
+ return true;
+}
+