re PR other/59545 (Signed integer overflow issues)

	PR other/59545
	* ira-color.c (update_conflict_hard_regno_costs): Perform the
	multiplication in unsigned type.

From-SVN: r208834

gcc/ChangeLog

+2014-03-26  Marek Polacek  <polacek@redhat.com>
+
+	PR other/59545
+	* ira-color.c (update_conflict_hard_regno_costs): Perform the
+	multiplication in unsigned type.
+
 2014-03-26  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* doc/install.texi: Document nds32le-*-elf and nds32be-*-elf.

gcc/ira-color.c

@@ -1505,7 +1505,7 @@ update_conflict_hard_regno_costs (int *costs, enum reg_class aclass,
 		index = ira_class_hard_reg_index[aclass][hard_regno];
 		if (index < 0)
 		  continue;
-		cost = conflict_costs [i] * mult / div;
+		cost = (int) ((unsigned) conflict_costs [i] * mult) / div;
 		if (cost == 0)
 		  continue;
 		cont_p = true;