re PR target/48213 (ICE in simplify_subreg called from s390_delegitimize_address)

	PR target/48213
	* config/s390/s390.c (s390_delegitimize_address): Don't call
	lowpart_subreg if orig_x has BLKmode.

	* gcc.dg/pr48213.c: New test.

From-SVN: r171211

gcc/ChangeLog

+2011-03-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/48213
+	* config/s390/s390.c (s390_delegitimize_address): Don't call
+	lowpart_subreg if orig_x has BLKmode.
+
 2011-03-21  Kai Tietz  <ktietz@redhat.com>
 
 	PR target/12171

gcc/config/s390/s390.c

@@ -5062,6 +5062,8 @@ s390_delegitimize_address (rtx orig_x)
 
   if (GET_MODE (orig_x) != Pmode)
     {
+      if (GET_MODE (orig_x) == BLKmode)
+	return orig_x;
       y = lowpart_subreg (GET_MODE (orig_x), y, Pmode);
       if (y == NULL_RTX)
 	return orig_x;

gcc/testsuite/ChangeLog

+2011-03-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/48213
+	* gcc.dg/pr48213.c: New test.
+
 2011-03-21  Kai Tietz  <ktietz@redhat.com>
 
 	PR target/12171

gcc/testsuite/gcc.dg/pr48213.c

+/* PR target/48213 */
+/* { dg-do compile } */
+/* { dg-options "-g -O2" } */
+/* { dg-options "-g -O2 -fpic" { target fpic } } */
+
+struct S { int (*s) (void); };
+int bar (void);
+
+void
+foo (struct S *x)
+{
+  if (x->s != bar)
+    bar ();
+}