re PR middle-end/18908 (Missed folding opportunities with bools)

2011-07-20  Richard Guenther  <rguenther@suse.de>

	PR middle-end/18908
	* tree.c (integer_all_onesp): Use TYPE_PRECISION, not mode precision.
	* tree-ssa-forwprop.c (simplify_bitwise_binary): Remove bogus
	ADDR_EXPR folding.  Canonicalize X ^ ~0 as ~X.

	* gcc.dg/tree-ssa/pr18908.c: New testcase.
	* gcc.dg/tree-ssa/bitwise-sink.c: Adjust.

From-SVN: r176510

gcc/tree.c

@@ -1759,9 +1759,7 @@ integer_all_onesp (const_tree expr)
   if (!uns)
     return 0;
 
-  /* Note that using TYPE_PRECISION here is wrong.  We care about the
-     actual bits, not the (arbitrary) range of the type.  */
-  prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
+  prec = TYPE_PRECISION (TREE_TYPE (expr));
   if (prec >= HOST_BITS_PER_WIDE_INT)
     {
       HOST_WIDE_INT high_value;