re PR target/86547 (s390x: Maximum number of LRA assignment passes is achieved…

re PR target/86547 (s390x: Maximum number of LRA assignment passes is achieved (30) when compiling a small inline assembler snippet)

        PR target/86547
	* lra-lives.c (remove_some_program_points_and_update_live_ranges):
        Check whether lra_live_max_point is 0 before dividing.

From-SVN: r263548

gcc/ChangeLog

+2018-08-14  Ilya Leoshkevich  <iii@linux.ibm.com>
+
+        PR target/86547
+	* lra-lives.c (remove_some_program_points_and_update_live_ranges):
+        Check whether lra_live_max_point is 0 before dividing.
+
 2018-08-14  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/86650

gcc/lra-lives.c

@@ -1153,7 +1153,8 @@ remove_some_program_points_and_update_live_ranges (void)
   n++;
   if (lra_dump_file != NULL)
     fprintf (lra_dump_file, "Compressing live ranges: from %d to %d - %d%%\n",
-	     lra_live_max_point, n, 100 * n / lra_live_max_point);
+	     lra_live_max_point, n,
+	     lra_live_max_point ? 100 * n / lra_live_max_point : 100);
   if (n < lra_live_max_point)
     {
       lra_live_max_point = n;