diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9cbe9c0ffb6..2e59648f2fa 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2012-01-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/51768
+	* stmt.c (check_unique_operand_names): Don't ICE during error
+	reporting if i is from labels chain.
+
 	PR middle-end/44777
 	* profile.c (branch_prob): Split bbs that have exit edge
 	and need a fake entry edge too.
diff --git a/gcc/stmt.c b/gcc/stmt.c
index af6439cd879..93d643a7bf0 100644
--- a/gcc/stmt.c
+++ b/gcc/stmt.c
@@ -1,7 +1,7 @@
 /* Expands front end tree to back end RTL for GCC
    Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
    1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
-   2010 Free Software Foundation, Inc.
+   2010, 2011, 2012 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -1253,11 +1253,11 @@ check_operand_nalternatives (tree outputs, tree inputs)
 static bool
 check_unique_operand_names (tree outputs, tree inputs, tree labels)
 {
-  tree i, j;
+  tree i, j, i_name = NULL_TREE;
 
   for (i = outputs; i ; i = TREE_CHAIN (i))
     {
-      tree i_name = TREE_PURPOSE (TREE_PURPOSE (i));
+      i_name = TREE_PURPOSE (TREE_PURPOSE (i));
       if (! i_name)
 	continue;
 
@@ -1268,7 +1268,7 @@ check_unique_operand_names (tree outputs, tree inputs, tree labels)
 
   for (i = inputs; i ; i = TREE_CHAIN (i))
     {
-      tree i_name = TREE_PURPOSE (TREE_PURPOSE (i));
+      i_name = TREE_PURPOSE (TREE_PURPOSE (i));
       if (! i_name)
 	continue;
 
@@ -1282,7 +1282,7 @@ check_unique_operand_names (tree outputs, tree inputs, tree labels)
 
   for (i = labels; i ; i = TREE_CHAIN (i))
     {
-      tree i_name = TREE_PURPOSE (i);
+      i_name = TREE_PURPOSE (i);
       if (! i_name)
 	continue;
 
@@ -1297,8 +1297,7 @@ check_unique_operand_names (tree outputs, tree inputs, tree labels)
   return true;
 
  failure:
-  error ("duplicate asm operand name %qs",
-	 TREE_STRING_POINTER (TREE_PURPOSE (TREE_PURPOSE (i))));
+  error ("duplicate asm operand name %qs", TREE_STRING_POINTER (i_name));
   return false;
 }
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d35dab996b5..5341574befe 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2012-01-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/51768
+	* c-c++-common/pr51768.c: New test.
+
 	PR middle-end/44777
 	* gcc.dg/tree-prof/pr44777.c: New test.
 
diff --git a/gcc/testsuite/c-c++-common/pr51768.c b/gcc/testsuite/c-c++-common/pr51768.c
new file mode 100644
index 00000000000..082594ccad7
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr51768.c
@@ -0,0 +1,25 @@
+/* PR middle-end/51768 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+void
+foo (void)
+{
+  asm goto ("" : : : : lab, lab, lab2, lab);	/* { dg-error "duplicate asm operand name" } */
+lab:;
+lab2:;
+}
+
+void
+bar (void)
+{
+  asm goto ("" : : [lab] "i" (0) : : lab);	/* { dg-error "duplicate asm operand name" } */
+lab:;
+}
+
+void
+baz (void)
+{
+  int x;
+  asm ("" : [lab] "=r" (x) : [lab] "r" (x));	/* { dg-error "duplicate asm operand name" } */
+}