https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83158
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testing
Index: gcc/tree-vrp.c
===================================================================
--- gcc/tree-vrp.c (revision 255173)
+++ gcc/tree-vrp.c (working copy)
@@ -6021,11 +6021,13 @@ intersect_ranges (enum value_range_type
&& 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 (integer_type_node))
&& TREE_CODE (vr1max) == INTEGER_CST
&& TREE_CODE (vr1min) == INTEGER_CST
&& (wi::clz (wi::to_wide (vr1max) - wi::to_wide (vr1min))
