re PR middle-end/67512 (internal compiler error: in invert_tree_comparison, at fold-const.c:2456)

	PR middle-end/67512
	* tree-ssa-uninit.c (pred_equal_p): Only call invert_tree_comparison
	for comparisons.

	* gcc.dg/pr67512.c: New test.

From-SVN: r227594

gcc/ChangeLog

+2015-09-09  Marek Polacek  <polacek@redhat.com>
+
+	PR middle-end/67512
+	* tree-ssa-uninit.c (pred_equal_p): Only call invert_tree_comparison
+	for comparisons.
+
 2015-09-09  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/53184

gcc/testsuite/ChangeLog

+2015-09-09  Marek Polacek  <polacek@redhat.com>
+
+	PR middle-end/67512
+	* gcc.dg/pr67512.c: New test.
+
 2015-09-09  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/53184

gcc/testsuite/gcc.dg/pr67512.c

+/* PR middle-end/67512 */
+/* { dg-do compile }  */
+/* { dg-options "-O -Wuninitialized" } */
+
+extern int fn2 (void);
+extern int fn3 (int);
+void
+fn1 (void)
+{
+  int z, m;
+  if (1 & m) /* { dg-warning "is used uninitialized" } */
+    z = fn2 ();
+  z = 1 == m ? z : 2 == m;
+  fn3 (z);
+}

gcc/tree-ssa-uninit.c

@@ -1296,7 +1296,8 @@ pred_equal_p (pred_info x1, pred_info x2)
     return false;
 
   c1 = x1.cond_code;
-  if (x1.invert != x2.invert)
+  if (x1.invert != x2.invert
+      && TREE_CODE_CLASS (x2.cond_code) == tcc_comparison)
     c2 = invert_tree_comparison (x2.cond_code, false);
   else
     c2 = x2.cond_code;