re PR target/47201 (ICE: SIGSEGV in adjust_mems (var-tracking.c:814) with -O -fPIC -g)

	PR target/47201
	* config/i386/i386.c (ix86_delegitimize_address): If
	simplify_gen_subreg fails, return orig_x.

	* gcc.dg/pr47201.c: New test.

From-SVN: r168582

gcc/ChangeLog

 2011-01-07  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/47201
+	* config/i386/i386.c (ix86_delegitimize_address): If
+	simplify_gen_subreg fails, return orig_x.
+
 	PR bootstrap/47187
 	* value-prof.c (gimple_stringop_fixed_value): Handle
 	lhs of the call properly.

gcc/config/i386/i386.c

 /* Subroutines used for code generation on IA-32.
    Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -13254,7 +13254,11 @@ ix86_delegitimize_address (rtx x)
 	return ix86_delegitimize_tls_address (orig_x);
       x = XVECEXP (XEXP (x, 0), 0, 0);
       if (GET_MODE (orig_x) != Pmode)
-	return simplify_gen_subreg (GET_MODE (orig_x), x, Pmode, 0);
+	{
+	  x = simplify_gen_subreg (GET_MODE (orig_x), x, Pmode, 0);
+	  if (x == NULL_RTX)
+	    return orig_x;
+	}
       return x;
     }
 
@@ -13323,7 +13327,11 @@ ix86_delegitimize_address (rtx x)
 	return orig_x;
     }
   if (GET_MODE (orig_x) != Pmode && MEM_P (orig_x))
-    return simplify_gen_subreg (GET_MODE (orig_x), result, Pmode, 0);
+    {
+      result = simplify_gen_subreg (GET_MODE (orig_x), result, Pmode, 0);
+      if (result == NULL_RTX)
+	return orig_x;
+    }
   return result;
 }
 

gcc/testsuite/ChangeLog

 2011-01-07  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/47201
+	* gcc.dg/pr47201.c: New test.
+
 	PR bootstrap/47187
 	* gcc.dg/tree-prof/pr47187.c: New test.
 

gcc/testsuite/gcc.dg/pr47201.c

+/* PR target/47201 */
+/* { dg-do compile } */
+/* { dg-options "-O -fpic -g" { target fpic } } */
+
+union U
+{
+  __UINTPTR_TYPE__ m;
+  float d;
+} u;
+
+int
+foo (void)
+{
+  union U v = {
+    (__UINTPTR_TYPE__)&u
+  };
+  return u.d == v.d;
+}