re PR tree-optimization/23511 (Segfault in fold_binary)

	PR tree-optimization/23511
	* tree-ssa-loop-niter.c (infer_loop_bounds_from_undefined): Don't
	handle cases where TYPE_MIN_VALUE or TYPE_MAX_VALUE are NULL_TREE.

From-SVN: r103391

gcc/ChangeLog

+2005-08-23  Sebastian Pop  <pop@cri.ensmp.fr>
+
+	PR tree-optimization/23511
+	* tree-ssa-loop-niter.c (infer_loop_bounds_from_undefined): Don't 
+	handle cases where TYPE_MIN_VALUE or TYPE_MAX_VALUE are NULL_TREE.
+
 2005-08-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/22043

gcc/tree-ssa-loop-niter.c

@@ -1460,7 +1460,9 @@ infer_loop_bounds_from_undefined (struct loop *loop)
 		    if (init == NULL_TREE
 			|| step == NULL_TREE
 			|| TREE_CODE (init) != INTEGER_CST
-			|| TREE_CODE (step) != INTEGER_CST)
+			|| TREE_CODE (step) != INTEGER_CST
+			|| TYPE_MIN_VALUE (type) == NULL_TREE
+			|| TYPE_MAX_VALUE (type) == NULL_TREE)
 		      break;
 
 		    utype = unsigned_type_for (type);