simplify-rtx.c (avoid_constant_pool_reference): Avoid calling simplify_subreg…

simplify-rtx.c (avoid_constant_pool_reference): Avoid calling simplify_subreg with BLKmode outer mode.

2006-11-09  Andreas Krebbel  <krebbel1@de.ibm.com>

	* simplify-rtx.c (avoid_constant_pool_reference): Avoid calling 
	simplify_subreg with BLKmode outer mode.

2006-11-09  Andreas Krebbel  <krebbel1@de.ibm.com>

	* gcc.dg/20061109-1.c: New testcase.

From-SVN: r118622

gcc/ChangeLog

+2006-11-09  Andreas Krebbel  <krebbel1@de.ibm.com>
+
+	* simplify-rtx.c (avoid_constant_pool_reference): Avoid calling 
+	simplify_subreg with BLKmode outer mode.
+
 2006-11-08  Brooks Moses  <brooks.moses@codesourcery.com>
 
 	* doc/invoke.texi: Minor formatting fixes in option lists.

gcc/simplify-rtx.c

@@ -158,6 +158,9 @@ avoid_constant_pool_reference (rtx x)
       return x;
     }
 
+  if (GET_MODE (x) == BLKmode)
+    return x;
+
   addr = XEXP (x, 0);
 
   /* Call target hook to avoid the effects of -fpic etc....  */

gcc/testsuite/ChangeLog

+2006-11-09  Andreas Krebbel  <krebbel1@de.ibm.com>
+
+	* gcc.dg/20061109-1.c: New testcase.
+
 2006-11-09  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* gcc.dg/builtins-20.c: Use fabs, not __builtin_fabs.

gcc/testsuite/gcc.dg/20061109-1.c

+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+/* This assignment might be implemented with a mem copy from the
+   literal pool with two BLKmode operands.  This produced an ICE on S/390
+   since simplify_subreg was called for such a BLKmode operand.  */
+
+struct a
+{
+  unsigned int b:24;
+};
+
+void
+foo (struct a *t)
+{
+  t->b = 32;
+}