re PR tree-optimization/47239 ((int)&func & 3 is always optimized to 0 on some targets)

2011-01-11  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/47239
	* tree-ssa-ccp.c (get_value_from_alignment): Punt for FUNCTION_DECLs.

From-SVN: r168661

gcc/ChangeLog

+2011-01-11  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/47239
+	* tree-ssa-ccp.c (get_value_from_alignment): Punt for FUNCTION_DECLs.
+
 2011-01-11  Jeff Law  <law@redhat.com>
 
 	* PR tree-optimization/47086

gcc/tree-ssa-ccp.c

@@ -522,6 +522,10 @@ get_value_from_alignment (tree expr)
     val = bit_value_binop (PLUS_EXPR, TREE_TYPE (expr),
 			   TREE_OPERAND (base, 0), TREE_OPERAND (base, 1));
   else if (base
+	   /* ???  While function decls have DECL_ALIGN their addresses
+	      may encode extra information in the lower bits on some
+	      targets (PR47239).  Simply punt for function decls for now.  */
+	   && TREE_CODE (base) != FUNCTION_DECL
 	   && ((align = get_object_alignment (base, BIGGEST_ALIGNMENT))
 		> BITS_PER_UNIT))
     {