hotspot: error checking

codes/correlation/correlation.c

@@ -38,6 +38,22 @@ void init_array (int m,
 
 }
 
+static
+void calc_error(int m,
+		 DATA_TYPE POLYBENCH_2D(corr,M,M,m,m))
+
+{
+  int i, j;
+  double error = 0;
+
+  for (i = 0; i < m; i++)
+    for (j = 0; j < m; j++) {
+        error += (corr[i][j] - 1.0)*(corr[i][j] - 1.0);
+    }
+  error /= m*m;
+  error = sqrtf(error);
+  printf("error: %f\n", error);
+}
 
 /* DCE code. Must scan the entire live-out data.
    Can be used also to check the correctness of the output. */
@@ -158,6 +174,9 @@ int main(int argc, char** argv)
      by the function call in argument. */
   polybench_prevent_dce(print_array(m, POLYBENCH_ARRAY(corr)));
 
+  /* calculate error */
+  calc_error(m, POLYBENCH_ARRAY(corr));
+
   /* Be clean. */
   POLYBENCH_FREE_ARRAY(data);
   POLYBENCH_FREE_ARRAY(corr);