re PR ipa/65282 (wrong code at -Os and above on x86_64-linux-gnu)

Fix PR ipa/65282.

	* gcc.dg/ipa/PR65282.c: New test.
	PR ipa/65282
	* ipa-icf.c (sem_variable::equals): Fix wrong condition.

From-SVN: r221146

gcc/ChangeLog

+2015-03-03  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/65282
+	* ipa-icf.c (sem_variable::equals): Fix wrong condition.
+
 2015-03-23  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/65241

gcc/ipa-icf.c

@@ -1638,7 +1638,7 @@ sem_variable::equals (tree t1, tree t2)
 	tree y1 = TREE_OPERAND (t1, 1);
 	tree y2 = TREE_OPERAND (t2, 1);
 
-	if (!sem_variable::equals (x1, x2) && sem_variable::equals (y1, y2))
+	if (!sem_variable::equals (x1, x2) || !sem_variable::equals (y1, y2))
 	  return false;
 	if (!sem_variable::equals (array_ref_low_bound (t1),
 				   array_ref_low_bound (t2)))

gcc/testsuite/ChangeLog

+2015-03-03  Martin Liska  <mliska@suse.cz>
+
+	* gcc.dg/ipa/PR65282.c: New test.
+
 2015-03-13  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/65241

gcc/testsuite/gcc.dg/ipa/PR65282.c

+/* { dg-do compile } */
+/* { dg-options "-Os -fdump-ipa-icf"  } */
+
+int a[2];
+static int *b = &a[0], *c = &a[1];
+
+int
+main ()
+{
+  *c = 1;
+  *b = 0;
+
+  if (a[1] != 1)
+    __builtin_abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "Equal symbols: 0" "icf"  } } */
+/* { dg-final { cleanup-ipa-dump "icf" } } */