re PR regression/52020 (ICE in immed_double_const, at emit-rtl.c:544)

2012-01-27  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/52020
	* tree-sra.c (sra_modify_assign): Do not transform clobbers.

From-SVN: r183633

gcc/ChangeLog

 2012-01-27  Richard Guenther  <rguenther@suse.de>
 
+	PR tree-optimization/52020
+	* tree-sra.c (sra_modify_assign): Do not transform clobbers.
+
+2012-01-27  Richard Guenther  <rguenther@suse.de>
+
 	* ipa-pure-const.c (check_stmt): Clobbers do not make a
 	function non-const/pure.
 

gcc/tree-sra.c

@@ -2836,6 +2836,20 @@ sra_modify_constructor_assign (gimple *stmt, gimple_stmt_iterator *gsi)
   if (!acc)
     return SRA_AM_NONE;
 
+  if (gimple_clobber_p (*stmt))
+    {
+      /* Remove clobbers of fully scalarized variables, otherwise
+	 do nothing.  */
+      if (acc->grp_covered)
+	{
+	  unlink_stmt_vdef (*stmt);
+	  gsi_remove (gsi, true);
+	  return SRA_AM_REMOVED;
+	}
+      else
+	return SRA_AM_NONE;
+    }
+
   loc = gimple_location (*stmt);
   if (VEC_length (constructor_elt,
 		  CONSTRUCTOR_ELTS (gimple_assign_rhs1 (*stmt))) > 0)