re PR tree-optimization/78455 (ICE in operator[], at vec.h:732)

	PR tree-optimization/78455
	* tree-ssa-uninit.c (can_chain_union_be_invalidated_p): Fix typo.

	* gcc.dg/uninit-23.c: New.

From-SVN: r242733

gcc/ChangeLog

+2016-11-22  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/78455
+	* tree-ssa-uninit.c (can_chain_union_be_invalidated_p): Fix typo.
+
 2016-11-22  Ian Lance Taylor  <iant@golang.org>
 
 	PR go/78431

gcc/testsuite/ChangeLog

+2016-11-22  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/78455
+	* gcc.dg/uninit-23.c: New.
+
 2016-11-22  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/78479

gcc/testsuite/gcc.dg/uninit-23.c

+/* PR tree-optimization/78455 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wuninitialized" } */
+
+int ij;
+
+void
+ql (void)
+{
+  int m5 = 0;
+
+  for (;;)
+  {
+    if (0)
+      for (;;)
+      {
+        int *go;
+        int *t4 = go;
+
+ l1:
+        *t4 = (*t4 != 0) ? 0 : 2; /* { dg-warning "may be used uninitialized" } */
+      }
+
+    if (ij != 0)
+      goto l1;
+  }
+}

gcc/tree-ssa-uninit.c

@@ -2192,7 +2192,7 @@ can_chain_union_be_invalidated_p (pred_chain_union use_preds,
       pred_chain c = use_preds[i];
       bool entire_pred_chain_invalidated = false;
       for (size_t j = 0; j < c.length (); ++j)
-	if (can_one_predicate_be_invalidated_p (c[i], worklist))
+	if (can_one_predicate_be_invalidated_p (c[j], worklist))
 	  {
 	    entire_pred_chain_invalidated = true;
 	    break;