re PR target/83158 (gcc.target/i386/pr78057.c fail)

2017-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/83158
	* tree-vrp.c (intersect_ranges): Prefer ~[0, 0] in a few more
	cases.

From-SVN: r255190

gcc/ChangeLog

+2017-11-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/83158
+	* tree-vrp.c (intersect_ranges): Prefer ~[0, 0] in a few more
+	cases.
+
 2017-11-28  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	PR 81288/target

gcc/tree-vrp.c

@@ -6021,11 +6021,14 @@ intersect_ranges (enum value_range_type *vr0type,
 		   && vrp_val_is_max (vr1max))
 	    ;
 	  /* Choose the anti-range if it is ~[0,0], that range is special
-	     enough to special case when vr1's range is relatively wide.  */
+	     enough to special case when vr1's range is relatively wide.
+	     At least for types bigger than int - this covers pointers
+	     and arguments to functions like ctz.  */
 	  else if (*vr0min == *vr0max
 		   && integer_zerop (*vr0min)
-		   && (TYPE_PRECISION (TREE_TYPE (*vr0min))
-		       == TYPE_PRECISION (ptr_type_node))
+		   && ((TYPE_PRECISION (TREE_TYPE (*vr0min))
+			>= TYPE_PRECISION (integer_type_node))
+		       || POINTER_TYPE_P (TREE_TYPE (*vr0min)))
 		   && TREE_CODE (vr1max) == INTEGER_CST
 		   && TREE_CODE (vr1min) == INTEGER_CST
 		   && (wi::clz (wi::to_wide (vr1max) - wi::to_wide (vr1min))