re PR rtl-optimization/52092 (ICE: internal consistency failure)

	PR rtl-optimization/52092
	* loop-unswitch.c (unswitch_single_loop): Call copy_rtx_if_shared
	on get_iv_value result.

	* gcc.c-torture/compile/pr52092.c: New test.

Co-Authored-By: Zdenek Dvorak <ook@ucw.cz>

From-SVN: r183869

gcc/ChangeLog

+2012-02-03  Jakub Jelinek  <jakub@redhat.com>
+	    Zdenek Dvorak  <ook@ucw.cz>
+
+	PR rtl-optimization/52092
+	* loop-unswitch.c (unswitch_single_loop): Call copy_rtx_if_shared
+	on get_iv_value result.
+
 2012-02-02  Andrew Pinski  <apinski@cavium.com>
 
 	PR middle-end/47982

gcc/loop-unswitch.c

 /* Loop unswitching for GNU compiler.
-   Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
+   Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2012
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -367,7 +367,7 @@ unswitch_single_loop (struct loop *loop, rtx cond_checked, int num)
     fprintf (dump_file, ";; Unswitching loop\n");
 
   /* Unswitch the loop on this condition.  */
-  nloop = unswitch_loop (loop, bbs[i], cond, cinsn);
+  nloop = unswitch_loop (loop, bbs[i], copy_rtx_if_shared (cond), cinsn);
   gcc_assert (nloop);
 
   /* Invoke itself on modified loops.  */

gcc/testsuite/ChangeLog

+2012-02-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/52092
+	* gcc.c-torture/compile/pr52092.c: New test.
+
 2012-02-02  Mikael Morin  <mikael@gcc.gnu.org>
 
 	PR fortran/41587

gcc/testsuite/gcc.c-torture/compile/pr52092.c

+/* PR rtl-optimization/52092 */
+
+int a, b, c, d, e, f, g;
+
+void
+foo (void)
+{
+  for (;;)
+    {
+      int *h = 0;
+      int i = 3;
+      int **j = &h;
+      if (e)
+	{
+	  c = d || a;
+	  g = c ? a : b;
+	  if ((char) (i * g))
+	    {
+	      h = &f;
+	      *h = 0;
+	    }
+	  **j = 0;
+	}
+    }
+}