https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94899
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
/* X + Z < Y + Z is the same as X < Y when there is no overflow. */
(for op (lt le ge gt)
(simplify
(op (plus:c @0 @2) (plus:c @1 @2))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
(op @0 @1))))
...
/* X - Z < Y - Z is the same as X < Y when there is no overflow. */
(for op (lt le ge gt)
(simplify
(op (minus @0 @2) (minus @1 @2))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
(op @0 @1))))
This is invalid as 0x80000000 is unsigned (C90/C++03) or long (C99/C++11) in
type.
Which means then overflow is not undefined but rather wrapping.
THIS ALSO means clang is broken.
