re PR c++/53261 (ICE in tree_strip_nop_conversions)

2012-05-09  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c++/53261
c-family/
	* c-common.c (warn_logical_operator): Check that argument of
	integer_zerop is not NULL.

From-SVN: r187300

gcc/c-family/ChangeLog

+2012-05-09  Manuel López-Ibáñez  <manu@gcc.gnu.org>
+
+	PR c++/53261
+	* c-common.c (warn_logical_operator): Check that argument of
+	integer_zerop is not NULL.
+
 2012-05-05  Manuel López-Ibáñez  <manu@gcc.gnu.org>
 
 	PR c/43772

gcc/c-family/c-common.c

@@ -1629,7 +1629,7 @@ warn_logical_operator (location_t location, enum tree_code code, tree type,
     in0_p = !in0_p;
 
   tem = build_range_check (UNKNOWN_LOCATION, type, lhs, in0_p, low0, high0);
-  if (integer_zerop (tem))
+  if (tem && integer_zerop (tem))
     return;
 
   rhs = make_range (op_right, &in1_p, &low1, &high1, &strict_overflow_p);
@@ -1644,7 +1644,7 @@ warn_logical_operator (location_t location, enum tree_code code, tree type,
     in1_p = !in1_p;
 
   tem = build_range_check (UNKNOWN_LOCATION, type, rhs, in1_p, low1, high1);
-  if (integer_zerop (tem))
+  if (tem && integer_zerop (tem))
     return;
 
   /* If both expressions have the same operand, if we can merge the