http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54945
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-10-17
CC| |jakub at gcc dot gnu.org
Ever Confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-10-17
12:06:59 UTC ---
Doesn't look like alias analysis to me, I'd say the problem is in
fold_sign_changed_comparison which has:
if ((TYPE_UNSIGNED (inner_type) != TYPE_UNSIGNED (outer_type)
|| POINTER_TYPE_P (inner_type) != POINTER_TYPE_P (outer_type))
&& code != NE_EXPR
&& code != EQ_EXPR)
return NULL_TREE;
While for TYPE_UNSIGNED changes NE_EXPR/EQ_EXPR are just fine, for
POINTER_TYPE_P changes I'm afraid we just need to be conservative.
