floyd-warshall: error checking

codes/floyd-warshall/floyd-warshall.c

@@ -57,13 +57,22 @@ void print_array(int n,
   POLYBENCH_DUMP_FINISH;
 }
 
+extern int _binary_data_bin_start;
+extern int _binary_data_bin_end;
+
 static
 void calc_error(int n,
 		 DATA_TYPE POLYBENCH_2D(path,N,N,n,n))
-
 {
+  double err = 0;
+  int *accurate = &_binary_data_bin_start;
+  int *test = &(path[0][0]);
+
   for (int i = 0; i < n*n; i++) {
-    }
+      err += (accurate[i] - test[i]) * (accurate[i] - test[i]);
+  }
+  err /= n*n;
+  printf("error: %f\n", err);
 }
 
 
@@ -114,6 +123,8 @@ int main(int argc, char** argv)
      by the function call in argument. */
   polybench_prevent_dce(print_array(n, POLYBENCH_ARRAY(path)));
 
+  calc_error(n, POLYBENCH_ARRAY(path));
+
   /* Be clean. */
   POLYBENCH_FREE_ARRAY(path);